$JBGS
JBG SMITH Properties Stock $jbgs

$jbgs Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000168979620000003 Filed on February 25, 2020

Income Statement

Concept	2019 Q4	2019	2018 Q4
Revenue	$164.9M	$647.8M	$163.3M
YoY Change	0.99%	0.56%	4.4%
Cost Of Revenue	$82.70M	$321.6M	$94.90M
YoY Change	-12.86%	4.08%	16.44%
Gross Profit	$82.20M	$326.2M	$68.30M
YoY Change	20.35%	-2.68%	-8.81%
Gross Profit Margin	49.86%	50.36%	41.84%
Selling, General & Admin	$23.90M	$89.00M	$9.100M
YoY Change	162.64%	27.51%	-51.08%
% of Gross Profit	29.08%	27.28%	13.32%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$50.90M	$195.8M	$68.70M
YoY Change	-25.91%	-9.21%	29.87%
% of Gross Profit	61.92%	60.02%	100.59%
Operating Expenses	$73.90M	$625.4M	$72.70M
YoY Change	1.65%	1.22%	3.12%
Operating Profit	$8.300M	-$299.2M	-$4.400M
YoY Change	-288.64%	5.85%	-200.0%
Interest Expense	-$8.800M	$52.70M	-$8.200M
YoY Change	7.32%	-29.22%	-41.01%
% of Operating Profit	-106.02%
Other Income/Expense, Net		$50.48M
YoY Change		158.16%
Pretax Income	$38.10M	$72.84M	$1.700M
YoY Change	2141.18%	58.78%	-106.01%
Income Tax	-$600.0K	-$1.302M	$700.0K
% Of Pretax Income	-1.57%	-1.79%	41.18%
Net Earnings	$34.39M	$65.57M	$700.0K
YoY Change	4812.86%	64.24%	-103.73%
Net Earnings / Revenue	20.86%	10.12%	0.43%
Basic Earnings Per Share	$0.25	$0.48	-$0.01
Diluted Earnings Per Share	$0.25	$0.48	-$0.01
COMMON SHARES
Basic Shares Outstanding	134.1M shares	130.7M	120.9M shares
Diluted Shares Outstanding		130.7M

Balance Sheet

Concept	2019 Q4	2019	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$126.4M	$126.4M	$260.6M
YoY Change	-51.5%	-51.5%	-17.71%
Cash & Equivalents	$126.4M	$126.4M	$260.6M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$222.7M	$222.7M	$190.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$349.1M	$349.1M	$450.6M
YoY Change	-22.53%	-22.53%	-11.6%
LONG-TERM ASSETS
Property, Plant & Equipment	$4.676B	$4.676B	$4.741B
YoY Change	-1.37%	-1.37%	-5.3%
Goodwill
YoY Change
Intangibles	$55.17M		$89.86M
YoY Change	-38.6%		-28.95%
Long-Term Investments	$543.0M	$543.0M	$322.9M
YoY Change	68.16%	68.16%	23.34%
Other Assets	$313.6M	$313.6M	$352.4M
YoY Change	-11.01%	-11.01%	150.28%
Total Long-Term Assets	$5.637B	$5.637B	$5.547B
YoY Change	1.63%	1.63%	-0.28%
TOTAL ASSETS
Total Short-Term Assets	$349.1M	$349.1M	$450.6M
Total Long-Term Assets	$5.637B	$5.637B	$5.547B
Total Assets	$5.986B	$5.986B	$5.997B
YoY Change	-0.18%	-0.18%	-1.23%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$157.7M	$157.7M	$131.0M
YoY Change	20.38%	20.38%	-5.48%
Accrued Expenses	$28.50M	$28.50M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$236.6M	$236.6M	$193.9M
YoY Change	22.02%	22.02%	5.78%
LONG-TERM LIABILITIES
Long-Term Debt	$1.623B	$1.623B	$2.151B
YoY Change	-24.55%	-24.55%	-2.39%
Other Long-Term Liabilities	$121.7M	$121.7M	$99.90M
YoY Change	21.82%	21.82%	8.0%
Total Long-Term Liabilities	$1.745B	$1.745B	$2.251B
YoY Change	-22.49%	-22.49%	-1.97%
TOTAL LIABILITIES
Total Short-Term Liabilities	$236.6M	$236.6M	$193.9M
Total Long-Term Liabilities	$1.745B	$1.745B	$2.251B
Total Liabilities	$1.987B	$2.600B	$2.452B
YoY Change	-18.96%	-13.63%	-1.45%
SHAREHOLDERS EQUITY
Retained Earnings	-$231.2M		-$176.0M
YoY Change	31.33%		83.72%
Common Stock	$1.342M		$1.210M
YoY Change	10.91%		2.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$3.386B	$3.387B	$2.987B
YoY Change
Total Liabilities & Shareholders Equity	$5.986B	$5.986B	$5.997B
YoY Change	-0.18%	-0.18%	-1.23%

Cashflow Statement

Concept	2019 Q4	2019	2018 Q4
OPERATING ACTIVITIES
Net Income	$34.39M	$65.57M	$700.0K
YoY Change	4812.86%	64.24%	-103.73%
Depreciation, Depletion And Amortization	$50.90M	$195.8M	$68.70M
YoY Change	-25.91%	-9.21%	29.87%
Cash From Operating Activities	$61.40M	$174.0M	$51.50M
YoY Change	19.22%	-7.55%	1.38%
INVESTING ACTIVITIES
Capital Expenditures	-$302.7M	-$606.2M	-$148.8M
YoY Change	103.43%	48.14%	57.13%
Acquisitions
YoY Change
Other Investing Activities	$207.6M	$365.6M	$126.2M
YoY Change	64.5%	-23.11%	-914.19%
Cash From Investing Activities	-$95.30M	-$240.7M	-$22.60M
YoY Change	321.68%	-462.86%	-79.47%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$472.8M
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-67.30M	-190.3M	-9.600M
YoY Change	601.04%	-1.66%	-176.8%
NET CHANGE
Cash From Operating Activities	61.40M	174.0M	51.50M
Cash From Investing Activities	-95.30M	-240.7M	-22.60M
Cash From Financing Activities	-67.30M	-190.3M	-9.600M
Net Change In Cash	-101.2M	-257.0M	19.30M
YoY Change	-624.35%	-521.51%	-141.24%
FREE CASH FLOW
Cash From Operating Activities	$61.40M	$174.0M	$51.50M
Capital Expenditures	-$302.7M	-$606.2M	-$148.8M
Free Cash Flow	$364.1M	$780.2M	$200.3M
YoY Change	81.78%	30.6%	37.66%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001689796
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17900000	USD
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	134148000	shares
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	200000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	120937000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	134148000	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	120937000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2019Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3800000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3300000	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-37994
CY2019	dei	Entity Registrant Name EntityRegistrantName	JBG SMITH PROPERTIES
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MD
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	81-4307010
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	4747 Bethesda Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Bethesda
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	MD
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20814
CY2019	dei	Entity Address Address Line2 EntityAddressAddressLine2	Suite 200
CY2019	dei	City Area Code CityAreaCode	240
CY2019	dei	Local Phone Number LocalPhoneNumber	333-3600
CY2019	dei	Security12b Title Security12bTitle	Common Shares, par value $0.01 per share
CY2019	dei	Trading Symbol TradingSymbol	JBGS
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2020Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	134882302	shares
CY2019Q2	dei	Entity Public Float EntityPublicFloat	5100000000	USD
CY2019Q2	us-gaap	Share Price SharePrice	39.34
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CY2019Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2019Q4	jbgs	Liabilitiesrelatedtoassetsheldforsale Liabilitiesrelatedtoassetsheldforsale	0	USD
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CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-88996000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1302000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-738000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9912000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	74144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	46613000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-79084000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	8573000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6710000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-7328000	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-21000	USD
CY2017	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-3000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65571000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39924000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-71753000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.70
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.70
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130687000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	119176000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	105359000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	130687000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	119176000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	105359000	shares
CY2019	us-gaap	Profit Loss ProfitLoss	74144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	46613000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-79084000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-27722000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	5382000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	1438000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1694000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-1090000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-399000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-26028000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6472000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1837000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	48116000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	53085000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-77247000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	8573000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6710000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-7328000	USD
CY2019	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	2584000	USD
CY2018	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	-1384000	USD
CY2017	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Redeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToRedeemableNoncontrollingInterest	-225000	USD
CY2019	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToNonredeemableNoncontrollingInterest	0	USD
CY2018	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToNonredeemableNoncontrollingInterest	21000	USD
CY2017	jbgs	Comprehensive Income Loss Net Of Tax Attributable To Nonredeemable Noncontrolling Interest ComprehensiveIncomeLossNetOfTaxAttributableToNonredeemableNoncontrollingInterest	3000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	42127000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	45012000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-70141000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2121984000	USD
CY2017	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	-71756000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	1526000	USD
CY2017	us-gaap	Stockholders Equity Note Spinoff Transaction StockholdersEquityNoteSpinoffTransaction	333020000	USD
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	96632000	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	0	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	864918000	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	3586000	USD
CY2017	us-gaap	Dividends Dividends	53080000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	171000	USD
CY2017	jbgs	Noncontrolling Interest Contributions NoncontrollingInterestContributions	499000	USD
CY2017	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-130917000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1837000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2974814000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	39903000	USD
CY2018	jbgs	Common Shares Issued During Periodin Connectionwith Redemptionof Op Units CommonSharesIssuedDuringPeriodinConnectionwithRedemptionofOPUnits	2962000	shares
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	109122000	USD
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	20000	shares
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	741000	USD
CY2018	us-gaap	Dividends Dividends	120133000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	347000	USD
CY2018	jbgs	Noncontrolling Interest Contributions NoncontrollingInterestContributions	250000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-17556000	USD
CY2018Q4	us-gaap	Business Combination Acquisition Of Less Than100 Percent Noncontrolling Interest Fair Value BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue	5550000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6472000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	364000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2987352000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	65571000	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	472780000	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	57318000	USD
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	47000	shares
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1803000	USD
CY2019	us-gaap	Dividends Dividends	120717000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	176000	USD
CY2019	jbgs	Noncontrolling Interest Contributions NoncontrollingInterestContributions	173000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-51399000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-26028000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3386677000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	74144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	46613000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-79084000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	65273000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	52675000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	33693000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	195795000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	215659000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	164580000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	39174000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	14056000	USD
CY2017	us-gaap	Straight Line Rent StraightLineRent	10388000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1395000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	39409000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4143000	USD
CY2019	jbgs	Amortization Of Acquired Below Market Lease Net Of Acquired Above Market Lease AmortizationOfAcquiredBelowMarketLeaseNetOfAcquiredAboveMarketLease	791000	USD
CY2018	jbgs	Amortization Of Acquired Below Market Lease Net Of Acquired Above Market Lease AmortizationOfAcquiredBelowMarketLeaseNetOfAcquiredAboveMarketLease	220000	USD
CY2017	jbgs	Amortization Of Acquired Below Market Lease Net Of Acquired Above Market Lease AmortizationOfAcquiredBelowMarketLeaseNetOfAcquiredAboveMarketLease	862000	USD
CY2019	us-gaap	Amortization Of Lease Incentives AmortizationOfLeaseIncentives	6336000	USD
CY2019	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	0	USD
CY2018	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	-7606000	USD
CY2018	us-gaap	Amortization Of Lease Incentives AmortizationOfLeaseIncentives	3406000	USD
CY2017	us-gaap	Amortization Of Lease Incentives AmortizationOfLeaseIncentives	4023000	USD
CY2017	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	24376000	USD
CY2019	jbgs	Gain Loss On Debt Extinguishment Including Prepayment Penalty GainLossOnDebtExtinguishmentIncludingPrepaymentPenalty	-5805000	USD
CY2018	jbgs	Gain Loss On Debt Extinguishment Including Prepayment Penalty GainLossOnDebtExtinguishmentIncludingPrepaymentPenalty	-4536000	USD
CY2017	jbgs	Gain Loss On Debt Extinguishment Including Prepayment Penalty GainLossOnDebtExtinguishmentIncludingPrepaymentPenalty	-701000	USD
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	104991000	USD
CY2018	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	52183000	USD
CY2017	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	0	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-50000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	926000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1348000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1560000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3298000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3807000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2690000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7827000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	2563000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-517000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1388000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-3955000	USD
CY2019	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-1336000	USD
CY2018	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-718000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	-10408000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	10170000	USD
CY2018	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2017	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	0	USD
CY2019	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	8382000	USD
CY2018	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	5582000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	2098000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	9177000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	16600000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	23481000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-7678000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-5984000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	16160000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-18220000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-19137000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-7397000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	173986000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	188193000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	74183000	USD
CY2019	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	441014000	USD
CY2018	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	385943000	USD
CY2017	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	210593000	USD
CY2019	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	165208000	USD
CY2018	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	23246000	USD
CY2017	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	0	USD
CY2017	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	97416000	USD
CY2019	us-gaap	Payments For Deposits On Real Estate Acquisitions PaymentsForDepositsOnRealEstateAcquisitions	850000	USD
CY2018	us-gaap	Payments For Deposits On Real Estate Acquisitions PaymentsForDepositsOnRealEstateAcquisitions	0	USD
CY2017	us-gaap	Payments For Deposits On Real Estate Acquisitions PaymentsForDepositsOnRealEstateAcquisitions	0	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	377511000	USD
CY2018	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	413077000	USD
CY2017	us-gaap	Proceeds From Sale Of Real Estate ProceedsFromSaleOfRealEstate	0	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	386000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	8834000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	7557000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	14408000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	6929000	USD
CY2019	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2018	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	80279000	USD
CY2017	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2019	us-gaap	Payments To Acquire Real Estate And Real Estate Joint Ventures PaymentsToAcquireRealEstateAndRealEstateJointVentures	18668000	USD
CY2018	us-gaap	Payments To Acquire Real Estate And Real Estate Joint Ventures PaymentsToAcquireRealEstateAndRealEstateJointVentures	31197000	USD
CY2017	us-gaap	Payments To Acquire Real Estate And Real Estate Joint Ventures PaymentsToAcquireRealEstateAndRealEstateJointVentures	16321000	USD
CY2019	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	0	USD
CY2018	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	0	USD
CY2017	us-gaap	Proceeds From Collection Of Notes Receivable ProceedsFromCollectionOfNotesReceivable	50934000	USD
CY2019	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	0	USD
CY2018	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	665000	USD
CY2017	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	2207000	USD
CY2019	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2018	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	0	USD
CY2017	us-gaap	Repayment Of Notes Receivable From Related Parties RepaymentOfNotesReceivableFromRelatedParties	75000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-240672000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	66327000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7676000	USD
CY2019	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2018	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	0	USD
CY2017	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	160203000	USD
CY2019	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	5550000	USD
CY2019	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	2200000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	200000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2019	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	0	USD
CY2018	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	0	USD
CY2017	us-gaap	Repayments Of Related Party Debt RepaymentsOfRelatedPartyDebt	115630000	USD
CY2019	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	0	USD
CY2018	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	0	USD
CY2017	us-gaap	Proceeds From Related Party Debt ProceedsFromRelatedPartyDebt	4000000	USD
CY2019	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	137000	USD
CY2018	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	114000	USD
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	17827000	USD
CY2018	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	118141000	USD
CY2017	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	366239000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	35000000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	115751000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	250000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	50000000	USD
CY2019	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	719003000	USD
CY2018	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	312894000	USD
CY2017	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	272905000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	150751000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	515000	USD
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	3114000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	19287000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	472780000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	1457000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	597000	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	0	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	129834000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	107372000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	26540000	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	17390000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	17398000	USD
CY2017	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	4556000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	207000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	250000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	357000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	95000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	340000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	18000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-190330000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-193545000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	239787000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-257016000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	60975000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	306294000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	399532000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	338557000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	32263000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	142516000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	399532000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	338557000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	126413000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	260553000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	316676000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	16103000	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	138979000	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	21881000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	142516000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	399532000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	338557000	USD
CY2019	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	0	USD
CY2018	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	0	USD
CY2017	us-gaap	Transfer Mortgage Payable TransferMortgagePayable	115630000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	49437000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	64605000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	52388000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	84076000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	53073000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	12445000	USD
CY2019	jbgs	Write Off Of Fully Depreciated Assets Including Asset Impairment WriteOffOfFullyDepreciatedAssetsIncludingAssetImpairment	66533000	USD
CY2018	jbgs	Write Off Of Fully Depreciated Assets Including Asset Impairment WriteOffOfFullyDepreciatedAssetsIncludingAssetImpairment	52272000	USD
CY2017	jbgs	Write Off Of Fully Depreciated Assets Including Asset Impairment WriteOffOfFullyDepreciatedAssetsIncludingAssetImpairment	55998000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	282000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	-1965000	USD
CY2019	jbgs	Investmentsin Joint Ventures InvestmentsinJointVentures	181813000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	3396000	USD
CY2017	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2018	jbgs	Investmentsin Joint Ventures InvestmentsinJointVentures	95923000	USD
CY2017	jbgs	Investmentsin Joint Ventures InvestmentsinJointVentures	0	USD
CY2019Q4	jbgs	Dividends Payable Common Shareholders DividendsPayableCommonShareholders	30184000	USD
CY2018Q4	jbgs	Dividends Payable Common Shareholders DividendsPayableCommonShareholders	39298000	USD
CY2017Q4	jbgs	Dividends Payable Common Shareholders DividendsPayableCommonShareholders	26540000	USD
CY2019Q4	jbgs	Dividends Payable Redeemable Noncontrolling Interest DividendsPayableRedeemableNoncontrollingInterest	3828000	USD
CY2018Q4	jbgs	Dividends Payable Redeemable Noncontrolling Interest DividendsPayableRedeemableNoncontrollingInterest	5896000	USD
CY2017Q4	jbgs	Dividends Payable Redeemable Noncontrolling Interest DividendsPayableRedeemableNoncontrollingInterest	4557000	USD
CY2019	jbgs	Noncash Contribution From Redeemable Noncontrolling Interests NoncashContributionFromRedeemableNoncontrollingInterests	0	USD
CY2018	jbgs	Noncash Contribution From Redeemable Noncontrolling Interests NoncashContributionFromRedeemableNoncontrollingInterests	0	USD
CY2017	jbgs	Noncash Contribution From Redeemable Noncontrolling Interests NoncashContributionFromRedeemableNoncontrollingInterests	5420000	USD
CY2019	jbgs	Temporary Equity Redemptionsof Op Units TemporaryEquityRedemptionsofOPUnits	-57318000	USD
CY2018	jbgs	Temporary Equity Redemptionsof Op Units TemporaryEquityRedemptionsofOPUnits	-109208000	USD
CY2017	jbgs	Temporary Equity Redemptionsof Op Units TemporaryEquityRedemptionsofOPUnits	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	35318000	USD
CY2018	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	jbgs	Operating Lease Liability Obtainedin Exchangefor Rightof Use Asset OperatingLeaseLiabilityObtainedinExchangeforRightofUseAsset	37922000	USD
CY2018	jbgs	Operating Lease Liability Obtainedin Exchangefor Rightof Use Asset OperatingLeaseLiabilityObtainedinExchangeforRightofUseAsset	0	USD
CY2017	jbgs	Operating Lease Liability Obtainedin Exchangefor Rightof Use Asset OperatingLeaseLiabilityObtainedinExchangeforRightofUseAsset	0	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	6202000	USD
CY2018	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2017	us-gaap	Operating Lease Payments OperatingLeasePayments	0	USD
CY2019	us-gaap	Temporary Equity Stock Issued During Period Value New Issues TemporaryEquityStockIssuedDuringPeriodValueNewIssues	0	USD
CY2018	us-gaap	Temporary Equity Stock Issued During Period Value New Issues TemporaryEquityStockIssuedDuringPeriodValueNewIssues	0	USD
CY2017	us-gaap	Temporary Equity Stock Issued During Period Value New Issues TemporaryEquityStockIssuedDuringPeriodValueNewIssues	96632000	USD
CY2019	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2018	us-gaap	Stock Issued1 StockIssued1	0	USD
CY2017	us-gaap	Stock Issued1 StockIssued1	2330579000	USD
CY2019	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	0	USD
CY2018	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	0	USD
CY2017	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	864918000	USD
CY2019	jbgs	Noncash Or Part Noncash Issuance Of Partnership Units In Business Combination NoncashOrPartNoncashIssuanceOfPartnershipUnitsInBusinessCombination	0	USD
CY2018	jbgs	Noncash Or Part Noncash Issuance Of Partnership Units In Business Combination NoncashOrPartNoncashIssuanceOfPartnershipUnitsInBusinessCombination	0	USD
CY2017	jbgs	Noncash Or Part Noncash Issuance Of Partnership Units In Business Combination NoncashOrPartNoncashIssuanceOfPartnershipUnitsInBusinessCombination	359967000	USD
CY2019	jbgs	Noncashor Part Noncash Contributionsfrom Former Parent NoncashorPartNoncashContributionsfromFormerParent	0	USD
CY2018	jbgs	Noncashor Part Noncash Contributionsfrom Former Parent NoncashorPartNoncashContributionsfromFormerParent	0	USD
CY2017	jbgs	Noncashor Part Noncash Contributionsfrom Former Parent NoncashorPartNoncashContributionsfromFormerParent	172817000	USD
CY2019Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	62
CY2019	us-gaap	Basis Of Accounting BasisOfAccounting	<div style="line-height:120%;padding-top:16px;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;">Basis of Presentation</span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The accompanying consolidated and combined financial statements and notes are prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany transactions and balances have been eliminated.</span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The accompanying consolidated financial statements include the accounts of JBG SMITH and our wholly owned subsidiaries and those other entities, including JBG SMITH LP, in which we have a controlling financial interest, including where we have been determined to be the primary beneficiary of a variable interest entity ("VIE"). See Note 7 for additional information on our VIEs. The portions of the equity and net income of consolidated subsidiaries that are not attributable to JBG SMITH are presented separately as amounts attributable to noncontrolling interests in our consolidated and combined financial statements. </span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">References to the financial statements refer to our consolidated and combined financial statements as of </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;">, and for each of the three years in the period ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">. References to our balance sheets refer to our consolidated balance sheets as of </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;"> and </span><span style="font-family:inherit;font-size:10pt;">2018</span><span style="font-family:inherit;font-size:10pt;">. References to our statements of operations refer to our consolidated and combined statements of operations for each of the three years in the period ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">. References to our statements of comprehensive income (loss) refer to our consolidated and combined statements of comprehensive income (loss) for each of the three years in the period ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">. References to our statements of cash flows refer to our consolidated and combined statements of cash flows for each of the three years in the period ended </span><span style="font-family:inherit;font-size:10pt;">December 31, 2019</span><span style="font-family:inherit;font-size:10pt;">.</span></div>
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-weight:bold;">Use of Estimates</span></div><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The preparation of the financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates include: (i) the underlying cash flows used in assessing impairment and (ii) the determination of useful lives for tangible and intangible assets. Actual results could differ from these estimates.</span></div>
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	35300000	USD
CY2019Q1	us-gaap	Deferred Rent Credit DeferredRentCredit	3500000	USD
CY2019Q1	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	767000	USD
CY2019Q1	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	140000	USD
CY2018	jbgs	Deferred Costs Internal Leasing Net DeferredCostsInternalLeasingNet	6500000	USD
CY2017	jbgs	Deferred Costs Internal Leasing Net DeferredCostsInternalLeasingNet	2900000	USD
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	458329000	USD
CY2019	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	34944000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	493273000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Remainder Of Fiscal Year LessorOperatingLeasePaymentsToBeReceivedRemainderOfFiscalYear	371332000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	297603000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	265150000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	220722000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	191946000	USD
CY2019Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	933143000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	377427000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	321205000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	287463000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	256352000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	215203000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	1188767000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.054
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P23Y10M24D
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	5999000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	3348000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3064000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2061000	USD
CY2019Q4	jbgs	Lessee Operating Lease Liability Payments Due Thereafter LesseeOperatingLeaseLiabilityPaymentsDueThereafter	36580000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	53052000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	24576000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	28476000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Duein Five Years OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueinFiveYears	9489000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Due After Five Years OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueAfterFiveYears	55780000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Duein Next Twelve Months OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueinNextTwelveMonths	13991000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Duein Two Years OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueinTwoYears	13710000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Duein Three Years OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueinThreeYears	13395000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments Duein Four Years OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPaymentsDueinFourYears	12554000	USD
CY2018Q4	jbgs	Operatingand Capital Leases And Lease Assumption Liabilities Future Minimum Payments OperatingandCapitalLeasesAndLeaseAssumptionLiabilitiesFutureMinimumPayments	118919000	USD
CY2019	jbgs	Fixed Operatingand Finance Lease Cost FixedOperatingandFinanceLeaseCost	2300000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	1300000	USD
CY2017	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	24400000	USD
CY2018	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	-7600000	USD
CY2019Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Transaction Costs BusinessAcquisitionCostOfAcquiredEntityTransactionCosts	4700000	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	28000000.0	USD
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	104991000	USD
CY2018	jbgs	Grossproceedsfromsaleofrealestate Grossproceedsfromsaleofrealestate	427400000	USD
CY2018	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	52200000	USD
CY2019Q4	us-gaap	Assets Held For Sale Not Part Of Disposal Group AssetsHeldForSaleNotPartOfDisposalGroup	168412000	USD
CY2019Q4	jbgs	Liabilitiesrelatedtoassetsheldforsale Liabilitiesrelatedtoassetsheldforsale	0	USD
CY2018Q4	jbgs	Equity Method Investment Unamortized Deferred Financing Costs EquityMethodInvestmentUnamortizedDeferredFinancingCosts	1998000	USD
CY2019Q4	jbgs	Equity Method Investment Long Term Debt Net EquityMethodInvestmentLongTermDebtNet	1187856000	USD
CY2018Q4	jbgs	Equity Method Investment Long Term Debt Net EquityMethodInvestmentLongTermDebtNet	1125368000	USD
CY2019Q4	jbgs	Equity Method Investment Summarized Financial Information Assets Real Estate Investment Property Net EquityMethodInvestmentSummarizedFinancialInformationAssetsRealEstateInvestmentPropertyNet	2493961000	USD
CY2018Q4	jbgs	Equity Method Investment Summarized Financial Information Assets Real Estate Investment Property Net EquityMethodInvestmentSummarizedFinancialInformationAssetsRealEstateInvestmentPropertyNet	2050985000	USD
CY2019Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	37823000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross AccountsReceivableGross	31362000	USD
CY2019Q4	jbgs	Management Fee Receivable ManagementFeeReceivable	14541000	USD
CY2018Q4	jbgs	Management Fee Receivable ManagementFeeReceivable	12443000	USD
CY2019Q4	us-gaap	Other Receivables OtherReceivables	577000	USD
CY2018Q4	us-gaap	Other Receivables OtherReceivables	9463000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	0	USD
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Premiums And Other Receivables AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	6700000	USD
CY2019Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	52941000	USD
CY2018Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	46568000	USD
CY2019Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	543026000	USD
CY2018Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	322878000	USD
CY2018	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	10100000	USD
CY2019Q4	jbgs	Equity Method Investment Long Term Debt Percentage Bearing Variable Interest Percentage Rate EquityMethodInvestmentLongTermDebtPercentageBearingVariableInterestPercentageRate	0.0410
CY2019Q4	jbgs	Equity Method Investment Long Term Debt Bearing Variable Amount EquityMethodInvestmentLongTermDebtBearingVariableAmount	629479000	USD
CY2018Q4	jbgs	Equity Method Investment Long Term Debt Bearing Variable Amount EquityMethodInvestmentLongTermDebtBearingVariableAmount	461704000	USD
CY2019Q4	jbgs	Equity Method Investment Long Term Debt Percentage Bearing Fixed Interest Percentage Rate EquityMethodInvestmentLongTermDebtPercentageBearingFixedInterestPercentageRate	0.0398
CY2019Q4	jbgs	Equity Method Investment Long Term Debt Bearing Fixed Amount EquityMethodInvestmentLongTermDebtBearingFixedAmount	561236000	USD
CY2018Q4	jbgs	Equity Method Investment Long Term Debt Bearing Fixed Amount EquityMethodInvestmentLongTermDebtBearingFixedAmount	665662000	USD
CY2019Q4	jbgs	Equity Method Investment Long Term Debt EquityMethodInvestmentLongTermDebt	1190715000	USD
CY2018Q4	jbgs	Equity Method Investment Long Term Debt EquityMethodInvestmentLongTermDebt	1127366000	USD
CY2019Q4	jbgs	Equity Method Investment Unamortized Deferred Financing Costs EquityMethodInvestmentUnamortizedDeferredFinancingCosts	2859000	USD
CY2019Q4	jbgs	Equity Method Investment Summarized Financial Information Assets Other EquityMethodInvestmentSummarizedFinancialInformationAssetsOther	291092000	USD
CY2018Q4	jbgs	Equity Method Investment Summarized Financial Information Assets Other EquityMethodInvestmentSummarizedFinancialInformationAssetsOther	169264000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	135256000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	1000036000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	2785053000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	2220249000	USD
CY2019Q1	jbgs	Equity Method Investment Summarized Financial Information Assets Operating Leases Rightof Use Assets EquityMethodInvestmentSummarizedFinancialInformationAssetsOperatingLeasesRightofUseAssets	52400000	USD
CY2019Q1	jbgs	Equity Method Investment Summarized Financial Information Liabilities Operating Lease Liability EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOperatingLeaseLiability	44100000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	2785053000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	2220249000	USD
CY2019Q4	jbgs	Equity Method Investment Summarized Financial Information Liabilities Secured Debt EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesSecuredDebt	1187856000	USD
CY2018Q4	jbgs	Equity Method Investment Summarized Financial Information Liabilities Secured Debt EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesSecuredDebt	1125368000	USD
CY2019Q4	jbgs	Equity Method Investment Summarized Financial Information Liabilities Other EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOther	168243000	USD
CY2018Q4	jbgs	Equity Method Investment Summarized Financial Information Liabilities Other EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesOther	94845000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	1356099000	USD
CY2018Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	1220213000	USD
CY2019Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity Or Capital EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital	1428954000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	266653000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	300032000	USD
CY2019	jbgs	Equity Method Investment Summarized Financial Information Operating Income Loss EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	18041000	USD
CY2018	jbgs	Equity Method Investment Summarized Financial Information Operating Income Loss EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	56262000	USD
CY2017	jbgs	Equity Method Investment Summarized Financial Information Operating Income Loss EquityMethodInvestmentSummarizedFinancialInformationOperatingIncomeLoss	14741000	USD
CY2019	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-32507000	USD
CY2018	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-1155000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-7593000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	205830000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	202066000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	79814000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Accumulated Amortization DeferredCostsLeasingAccumulatedAmortization	72465000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	126016000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Net DeferredCostsLeasingNet	129601000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23644000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34390000	USD
CY2019Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	48620000	USD
CY2018Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	55469000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19865000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	12556000	USD
CY2018Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	6482000	USD
CY2019Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	3071000	USD
CY2018Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	4806000	USD
CY2019Q4	us-gaap	Deposit Assets DepositAssets	3210000	USD
CY2018Q4	us-gaap	Deposit Assets DepositAssets	3633000	USD
CY2019Q4	us-gaap	Derivative Instruments In Hedges Assets At Fair Value DerivativeInstrumentsInHedgesAssetsAtFairValue	0	USD
CY2018Q4	us-gaap	Derivative Instruments In Hedges Assets At Fair Value DerivativeInstrumentsInHedgesAssetsAtFairValue	10383000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	16705000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	20230000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	253687000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	264994000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	42447000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	49845000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	18803000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	15455000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	23644000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	34390000	USD
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	66156000	USD
CY2018Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	66156000	USD
CY2019Q4	jbgs	Intangible Assets Accumulated Amortization IntangibleAssetsAccumulatedAmortization	17536000	USD
CY2018Q4	jbgs	Intangible Assets Accumulated Amortization IntangibleAssetsAccumulatedAmortization	10687000	USD
CY2019Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	48620000	USD
CY2018Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	55469000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	15953000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21561000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14954000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12949000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	9993000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	8999000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	8510000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	7973000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	6750000	USD
CY2019Q4	us-gaap	Advance Rent AdvanceRent	23612000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	55174000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	2900000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5200000	USD
CY2018	jbgs	Derivative Entered Into Notional Value DerivativeEnteredIntoNotionalValue	381300000	USD
CY2019Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	3100000	USD
CY2018Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	4800000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	99341000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	296227000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	107500000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	273961000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	334290000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	516529000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1627848000	USD
CY2019Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	38577000	USD
CY2018Q4	us-gaap	Below Market Lease Gross BelowMarketLeaseGross	40179000	USD
CY2019Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	26253000	USD
CY2018Q4	us-gaap	Below Market Lease Accumulated Amortization BelowMarketLeaseAccumulatedAmortization	26081000	USD
CY2019Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	12324000	USD
CY2018Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	14098000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	0	USD
CY2018Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	15704000	USD
CY2018Q4	us-gaap	Advance Rent AdvanceRent	21998000	USD
CY2019Q4	jbgs	Lease Assumptions Liabilities LeaseAssumptionsLiabilities	17589000	USD
CY2018Q4	jbgs	Lease Assumptions Liabilities LeaseAssumptionsLiabilities	23105000	USD
CY2019Q4	us-gaap	Incentive From Lessor IncentiveFromLessor	20854000	USD
CY2018Q4	us-gaap	Incentive From Lessor IncentiveFromLessor	9317000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	28476000	USD
CY2018Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	0	USD
CY2019Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	16348000	USD
CY2018Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	17696000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17898000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17898000	USD
CY2019Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	0	USD
CY2018Q4	us-gaap	Deferred Rent Credit DeferredRentCredit	3510000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	5542000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6878000	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	34012000	USD
CY2018Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	45193000	USD
CY2019Q4	us-gaap	Derivative Instruments In Hedges Liabilities At Fair Value DerivativeInstrumentsInHedgesLiabilitiesAtFairValue	17440000	USD
CY2018Q4	us-gaap	Derivative Instruments In Hedges Liabilities At Fair Value DerivativeInstrumentsInHedgesLiabilitiesAtFairValue	1723000	USD
CY2019Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	11947000	USD
CY2018Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	4486000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	206042000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	181606000	USD
CY2019	jbgs	Amortizationof Intangible Liabilities AmortizationofIntangibleLiabilities	2500000	USD
CY2018	jbgs	Amortizationof Intangible Liabilities AmortizationofIntangibleLiabilities	2600000	USD
CY2017	jbgs	Amortizationof Intangible Liabilities AmortizationofIntangibleLiabilities	2300000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Next Twelve Months BelowMarketLeaseAmortizationIncomeNextTwelveMonths	2017000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Two BelowMarketLeaseAmortizationIncomeYearTwo	1800000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Three BelowMarketLeaseAmortizationIncomeYearThree	1781000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Four BelowMarketLeaseAmortizationIncomeYearFour	1773000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income Year Five BelowMarketLeaseAmortizationIncomeYearFive	1755000	USD
CY2019Q4	us-gaap	Below Market Lease Amortization Income After Year Five BelowMarketLeaseAmortizationIncomeAfterYearFive	3198000	USD
CY2019Q4	us-gaap	Below Market Lease Net BelowMarketLeaseNet	12324000	USD
CY2017	jbgs	Tax Cutsand Jobs Act Changein Tax Rate Deferred Tax Liability Income Taxes TaxCutsandJobsActChangeinTaxRateDeferredTaxLiabilityIncomeTaxes	3900000	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	3600000	USD
CY2019Q4	jbgs	Sec Schedule1228 Real Estate Companies Investmentin Real Estate Federal Income Tax Basis Difference SECSchedule1228RealEstateCompaniesInvestmentinRealEstateFederalIncomeTaxBasisDifference	55900000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	34000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-20000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	496000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1336000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-718000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-10408000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1302000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-738000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9912000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	5500000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	721000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	915000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	2326000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	626000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	998000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals	583000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	435000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Charitable Contribution Carryforwards DeferredTaxAssetsCharitableContributionCarryforwards	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	217000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	198000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2914000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	4105000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	523000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	469000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2391000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3636000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	7412000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	9905000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	521000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	609000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	7933000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	10514000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	5542000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6878000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.90
CY2019	jbgs	Common Stock Dividends Per Share Declared Taxableas Ordinary Incomeinthe Current Year CommonStockDividendsPerShareDeclaredTaxableasOrdinaryIncomeintheCurrentYear	0.333
CY2019	jbgs	Common Stock Dividends Per Share Declared Taxableas Returnof Capital CommonStockDividendsPerShareDeclaredTaxableasReturnofCapital	0.342
CY2019	jbgs	Common Stock Dividends Per Share Declared Taxable Statustobe Determinedin Next Year CommonStockDividendsPerShareDeclaredTaxableStatustobeDeterminedinNextYear	0.225
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.00
CY2018	jbgs	Common Stock Dividends Per Share Declared Indicated Annual Amount CommonStockDividendsPerShareDeclaredIndicatedAnnualAmount	0.90
CY2018	jbgs	Common Stock Dividends Per Share Declared Additional Declared CommonStockDividendsPerShareDeclaredAdditionalDeclared	0.10
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CY2018	jbgs	Common Stock Dividends Per Share Declared Taxableas Returnof Capital CommonStockDividendsPerShareDeclaredTaxableasReturnofCapital	0.469
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.45
CY2017	jbgs	Common Stock Dividends Per Share Declared Taxableas Ordinary Incomeinthe Current Year CommonStockDividendsPerShareDeclaredTaxableasOrdinaryIncomeintheCurrentYear	0.385
CY2017	jbgs	Common Stock Dividends Per Share Declared Taxableas Returnof Capital CommonStockDividendsPerShareDeclaredTaxableasReturnofCapital	0.065
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	558140000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	609129000	USD
CY2019	jbgs	Temporary Equity Redemptionsof Op Units TemporaryEquityRedemptionsofOPUnits	-57318000	USD
CY2018	jbgs	Temporary Equity Redemptionsof Op Units TemporaryEquityRedemptionsofOPUnits	-109208000	USD
CY2019	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	3954000	USD
CY2018	us-gaap	Stock Issued During Period Value Issued For Services StockIssuedDuringPeriodValueIssuedForServices	0	USD
CY2019	us-gaap	Temporary Equity Net Income TemporaryEquityNetIncome	8573000	USD
CY2018	us-gaap	Temporary Equity Net Income TemporaryEquityNetIncome	6710000	USD
CY2019	jbgs	Temporary Equity Other Comprehensive Income Loss TemporaryEquityOtherComprehensiveIncomeLoss	-2584000	USD
CY2018	jbgs	Temporary Equity Other Comprehensive Income Loss TemporaryEquityOtherComprehensiveIncomeLoss	1384000	USD
CY2019	jbgs	Temporary Equity Contributions Distributions TemporaryEquityContributionsDistributions	-15254000	USD
CY2018	jbgs	Temporary Equity Contributions Distributions TemporaryEquityContributionsDistributions	-18237000	USD
CY2019	jbgs	Temporary Equity Sharebased Compensation TemporaryEquitySharebasedCompensation	63264000	USD
CY2018	jbgs	Temporary Equity Sharebased Compensation TemporaryEquitySharebasedCompensation	52190000	USD
CY2019	us-gaap	Temporary Equity Issue Period Increase Or Decrease TemporaryEquityIssuePeriodIncreaseOrDecrease	53983000	USD
CY2018	us-gaap	Temporary Equity Issue Period Increase Or Decrease TemporaryEquityIssuePeriodIncreaseOrDecrease	16172000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	612758000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	558140000	USD
CY2017Q3	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	110600000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	33.39
CY2019	jbgs	Allocated Sharebased Compensation Expense Before Capitalization AllocatedSharebasedCompensationExpenseBeforeCapitalization	67799000	USD
CY2018	jbgs	Allocated Sharebased Compensation Expense Before Capitalization AllocatedSharebasedCompensationExpenseBeforeCapitalization	56016000	USD
CY2017	jbgs	Allocated Sharebased Compensation Expense Before Capitalization AllocatedSharebasedCompensationExpenseBeforeCapitalization	34160000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	2526000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	3341000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	467000	USD
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	65273000	USD
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	52675000	USD
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1	33693000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	77400000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P2Y2M12D
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	2000000.0	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1800000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3600000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	23235000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	27706000	USD
CY2017	us-gaap	Restructuring Charges RestructuringCharges	127739000	USD
CY2019	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	79234000	USD
CY2018	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	91651000	USD
CY2017	us-gaap	Interest Expense Debt Excluding Amortization InterestExpenseDebtExcludingAmortization	69178000	USD
CY2019	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3217000	USD
CY2018	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	4661000	USD
CY2017	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	3011000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-50000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	926000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1348000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	135000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-27000	USD
CY2019	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	29806000	USD
CY2018	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	20804000	USD
CY2017	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	12727000	USD
CY2019	us-gaap	Interest Expense InterestExpense	52695000	USD
CY2018	us-gaap	Interest Expense InterestExpense	74447000	USD
CY2017	us-gaap	Interest Expense InterestExpense	58141000	USD
CY2019Q2	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	11500000	shares
CY2019Q2	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	1500000	shares
CY2019Q2	us-gaap	Shares Issued Price Per Share SharesIssuedPricePerShare	42.00
CY2019Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	472800000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	74144000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	46613000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	-79084000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	8573000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6710000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-7328000	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-21000	USD
CY2017	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-3000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65571000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39924000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-71753000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2489000	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	2599000	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1655000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	63082000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	37325000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-73408000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	130687000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	119176000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	105359000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.31
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.70
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.31
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.70
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4700000	shares
CY2018	us-gaap	Net Income Loss NetIncomeLoss	39924000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	-71753000	USD
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3900000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3300000	shares
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-17700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	8300000	USD
CY2019	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	-5500000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-50000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	926000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1300000	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	10200000	USD
CY2019	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2019	jbgs	Revenuefrom Contractwith Customer Excluding Reimbursements RevenuefromContractwithCustomerExcludingReimbursements	65452000	USD
CY2018	jbgs	Revenuefrom Contractwith Customer Excluding Reimbursements RevenuefromContractwithCustomerExcludingReimbursements	59684000	USD
CY2017	jbgs	Revenuefrom Contractwith Customer Excluding Reimbursements RevenuefromContractwithCustomerExcludingReimbursements	36329000	USD
CY2019	jbgs	Reimbursement Revenuefrom Third Parties ReimbursementRevenuefromThirdParties	55434000	USD
CY2018	jbgs	Reimbursement Revenuefrom Third Parties ReimbursementRevenuefromThirdParties	39015000	USD
CY2017	jbgs	Reimbursement Revenuefrom Third Parties ReimbursementRevenuefromThirdParties	26907000	USD
CY2019	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	120886000	USD
CY2018	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	98699000	USD
CY2017	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	63236000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	65571000	USD
CY2018	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	33728000	USD
CY2017	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	39350000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	191580000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	211436000	USD
CY2017	us-gaap	Depreciation And Amortization DepreciationAndAmortization	161659000	USD
CY2019	us-gaap	Other General And Administrative Expense OtherGeneralAndAdministrativeExpense	46822000	USD
CY2019	us-gaap	Management Fee Expense ManagementFeeExpense	113495000	USD
CY2018	us-gaap	Management Fee Expense ManagementFeeExpense	89826000	USD
CY2017	us-gaap	Management Fee Expense ManagementFeeExpense	51919000	USD
CY2019	jbgs	Allocated Sharebased Compensation Expense Formation Transaction AllocatedSharebasedCompensationExpenseFormationTransaction	42162000	USD
CY2018	jbgs	Allocated Sharebased Compensation Expense Formation Transaction AllocatedSharebasedCompensationExpenseFormationTransaction	36030000	USD
CY2017	jbgs	Allocated Sharebased Compensation Expense Formation Transaction AllocatedSharebasedCompensationExpenseFormationTransaction	29251000	USD
CY2019	jbgs	Transactionandothercosts Transactionandothercosts	23235000	USD
CY2018	jbgs	Transactionandothercosts Transactionandothercosts	27706000	USD
CY2017	jbgs	Transactionandothercosts Transactionandothercosts	127739000	USD
CY2019	us-gaap	Interest Expense InterestExpense	52695000	USD
CY2018	us-gaap	Interest Expense InterestExpense	74447000	USD
CY2017	us-gaap	Interest Expense InterestExpense	58141000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5805000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-5153000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-701000	USD
CY2019	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	0	USD
CY2018	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	-7606000	USD
CY2017	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	24376000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1302000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-738000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-9912000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	8573000	USD
CY2018	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	6710000	USD
CY2017	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-7328000	USD
CY2019	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	120886000	USD
CY2018	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	98699000	USD
CY2017	jbgs	Revenuefrom Contractwith Customer Including Reimbursements RevenuefromContractwithCustomerIncludingReimbursements	63236000	USD
CY2019	jbgs	Other Income Excluding Parking Income OtherIncomeExcludingParkingIncome	7638000	USD
CY2018	jbgs	Other Income Excluding Parking Income OtherIncomeExcludingParkingIncome	6358000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1395000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	39409000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-4143000	USD
CY2019	us-gaap	Investment Income Net InvestmentIncomeNet	5385000	USD
CY2018	us-gaap	Investment Income Net InvestmentIncomeNet	15168000	USD
CY2017	us-gaap	Investment Income Net InvestmentIncomeNet	1788000	USD
CY2019	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	104991000	USD
CY2018	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	52183000	USD
CY2017	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	0	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-21000	USD
CY2017	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	-3000	USD
CY2019	jbgs	Consolidated Noi ConsolidatedNOI	311131000	USD
CY2018	jbgs	Consolidated Noi ConsolidatedNOI	319990000	USD
CY2017	jbgs	Consolidated Noi ConsolidatedNOI	289340000	USD
CY2019	jbgs	Parking Income ParkingIncome	26000000.0	USD
CY2018	jbgs	Parking Income ParkingIncome	25700000	USD
CY2017	jbgs	Parking Income ParkingIncome	23100000	USD
CY2017	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	451541000	USD
CY2017	us-gaap	Other Operating Income OtherOperatingIncome	23069000	USD
CY2017	jbgs	Rental Revenue RentalRevenue	474610000	USD
CY2017	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	118836000	USD
CY2017	us-gaap	Real Estate Tax Expense RealEstateTaxExpense	66434000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	185270000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	289340000	USD
CY2019Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	5775519000	USD
CY2019Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	543026000	USD
CY2019Q4	us-gaap	Assets Assets	5986251000	USD
CY2018Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	5792734000	USD
CY2018Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	322878000	USD
CY2018Q4	us-gaap	Assets Assets	5997285000	USD
CY2019	jbgs	General Liability Insurance Coverage Limit Per Occurrence GeneralLiabilityInsuranceCoverageLimitPerOccurrence	200000000.0	USD
CY2019	jbgs	Propertyand Rental Value Insurance Coverage Limit PropertyandRentalValueInsuranceCoverageLimit	2000000000.0	USD
CY2019	jbgs	Terrorist Acts Insurance Coverage Limit Per Occurrence TerroristActsInsuranceCoverageLimitPerOccurrence	2000000000.0	USD
CY2019Q4	us-gaap	Purchase Obligation PurchaseObligation	196900000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	17900000	USD
CY2019Q4	us-gaap	Other Commitment OtherCommitment	57700000	USD
CY2019Q4	jbgs	Qualified Affordable Housing Project Investments Total Capital Commitments QualifiedAffordableHousingProjectInvestmentsTotalCapitalCommitments	104800000	USD
CY2019Q1	us-gaap	Revenues Revenues	155199000	USD
CY2019Q2	us-gaap	Revenues Revenues	160617000	USD
CY2019Q2	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	-3328000	USD
CY2019Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	10532000	USD
CY2019Q3	us-gaap	Revenues Revenues	167077000	USD
CY2019Q4	us-gaap	Revenues Revenues	164877000	USD
CY2019Q1	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	28248000	USD
CY2019Q4	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	38692000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24861000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-3040000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	9360000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	34390000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.20
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.03
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.20
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.03
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	10200000	USD
CY2018Q1	us-gaap	Revenues Revenues	163037000	USD
CY2018Q2	us-gaap	Revenues Revenues	159447000	USD
CY2018Q3	us-gaap	Revenues Revenues	158443000	USD
CY2018Q4	us-gaap	Revenues Revenues	163255000	USD
CY2018Q1	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	-4786000	USD
CY2018Q2	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	24023000	USD
CY2018Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	26382000	USD
CY2018Q4	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	994000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-4190000	USD
CY2018Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20574000	USD
CY2018Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22830000	USD
CY2018Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	710000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.04
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.01
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.04
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.01
CY2018Q2	jbgs	Business Combination Provisional Information Initial Accounting Incomplete Adjustment Bargain Purchase Reduction Of Gain BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentBargainPurchaseReductionOfGain	-7600000	USD
CY2018Q2	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-4500000	USD
CY2018Q4	jbgs	Transactionandothercosts Transactionandothercosts	15600000	USD
CY2019Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	1627848000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	1250141000	USD
CY2019	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	469450000	USD
CY2018	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	358976000	USD
CY2017	us-gaap	Real Estate Other Additions RealEstateOtherAdditions	1926404000	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Writedown Or Reserve Amount SECScheduleIIIRealEstateWritedownOrReserveAmount	585753000	USD
CY2018	us-gaap	Sec Schedule Iii Real Estate Writedown Or Reserve Amount SECScheduleIIIRealEstateWritedownOrReserveAmount	527189000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Writedown Or Reserve Amount SECScheduleIIIRealEstateWritedownOrReserveAmount	55998000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5895953000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6025797000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1086844000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1011330000	USD
CY2016Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	930769000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	2496974000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	2028404000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	1240455000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	4535064000	USD
CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5775519000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1119571000	USD
CY2019Q4	jbgs	Sec Schedule1228 Real Estate Companies Investmentin Real Estate Federal Income Tax Basis Difference SECSchedule1228RealEstateCompaniesInvestmentinRealEstateFederalIncomeTaxBasisDifference	55900000	USD
CY2018Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	5895953000	USD
CY2017Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	6025797000	USD
CY2016Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	4155391000	USD
CY2019	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	164320000	USD
CY2018	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	38369000	USD
CY2017	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	0	USD
CY2019	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	161937000	USD
CY2018	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	151346000	USD
CY2017	us-gaap	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense	136559000	USD
CY2019	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	129169000	USD
CY2018	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	75832000	USD
CY2017	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	55998000	USD
CY2018Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1086844000	USD
CY2017Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	1011330000	USD

Files In Submission

Name	View Source	Status
0001689796-20-000003-index-headers.html	Edgar Link	pending
0001689796-20-000003-index.html	Edgar Link	pending
0001689796-20-000003.txt	Edgar Link	pending
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chart-fedc0f1d3c54876b4b5.jpg	Edgar Link	pending
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Financial_Report.xlsx	Edgar Link	pending
jbgs-10k123119exhibit41.htm	Edgar Link	pending
jbgs-10kexhibit1030123.htm	Edgar Link	pending
jbgs-10kexhibit1031123.htm	Edgar Link	pending
jbgs-10kexhibit1032123.htm	Edgar Link	pending
jbgs-10kexhibit1033123.htm	Edgar Link	pending
jbgs-10kexhibit1034123.htm	Edgar Link	pending
jbgs-10kexhibit1035123.htm	Edgar Link	pending
jbgs-10kexhibit1037123.htm	Edgar Link	pending
jbgs-10kexhibit2111231.htm	Edgar Link	pending
jbgs-10kexhibit2311231.htm	Edgar Link	pending
jbgs-10kexhibit3111231.htm	Edgar Link	pending
jbgs-10kexhibit3121231.htm	Edgar Link	pending
jbgs-10kexhibit3211231.htm	Edgar Link	pending
jbgs-12311910xk.htm	Edgar Link	pending
jbgs-12311910xk_htm.xml	Edgar Link	completed
jbgs-20191231.xsd	Edgar Link	pending
jbgs-20191231_cal.xml	Edgar Link	unprocessable
jbgs-20191231_def.xml	Edgar Link	unprocessable
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jbgs-20191231_pre.xml	Edgar Link	unprocessable
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2019 Q4 Form 10-K Financial Statement

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$JBGS JBG SMITH Properties Stock $jbgs

2019 Q4 Form 10-K Financial Statement

#000168979620000003 Filed on February 25, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$JBGS
JBG SMITH Properties Stock $jbgs