$CSGP
COSTAR GROUP, INC. Stock $csgp

$csgp Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000105735222000027 Filed on February 23, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue	$506.8M	$1.944B	$444.4M
YoY Change	14.04%	17.19%	18.59%
Cost Of Revenue	$86.33M	$357.2M	$78.15M
YoY Change	10.46%	15.62%	4.21%
Gross Profit	$420.5M	$1.587B	$366.2M
YoY Change	14.8%	17.54%	22.19%
Gross Profit Margin	82.97%	81.62%	82.41%
Selling, General & Admin	$210.7M	$878.7M	$253.3M
YoY Change	-16.84%	5.18%	66.86%
% of Gross Profit	50.1%	55.37%	69.16%
Research & Development	$50.49M	$201.0M	$40.00M
YoY Change	26.22%	23.39%	12.99%
% of Gross Profit	12.01%	12.67%	10.92%
Depreciation & Amortization	$37.17M	$139.6M	$33.00M
YoY Change	12.63%	19.34%	37.5%
% of Gross Profit	8.84%	8.79%	9.01%
Operating Expenses	$280.1M	$1.155B	$311.0M
YoY Change	-9.95%	8.83%	56.5%
Operating Profit	$140.4M	$432.3M	$55.21M
YoY Change	154.27%	49.49%	-45.33%
Interest Expense	-$7.433M	-$31.62M	-$7.900M
YoY Change	-5.91%	81.78%	-1739.0%
% of Operating Profit	-5.29%	-7.31%	-14.31%
Other Income/Expense, Net	$419.0K	$3.252M	-$900.0K
YoY Change	-146.56%	-493.23%	200.0%
Pretax Income	$133.4M	$404.0M	$46.44M
YoY Change	187.18%	49.08%	-59.37%
Income Tax	$40.47M	$111.4M	$10.65M
% Of Pretax Income	30.34%	27.58%	22.94%
Net Earnings	$92.90M	$292.6M	$35.79M
YoY Change	159.58%	28.81%	-59.3%
Net Earnings / Revenue	18.33%	15.05%	8.05%
Basic Earnings Per Share		$0.75	$0.91
Diluted Earnings Per Share	$235.5K	$0.74	$0.91
COMMON SHARES
Basic Shares Outstanding	394.9M shares	392.2M shares	39.42M shares
Diluted Shares Outstanding		394.2M shares

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.827B	$3.827B	$3.756B
YoY Change	1.9%	1.9%	250.79%
Cash & Equivalents	$3.827B	$3.827B	$3.694B
Short-Term Investments
Other Short-Term Assets	$36.18M	$36.18M	$28.70M
YoY Change	26.07%	26.07%	-20.72%
Inventory
Prepaid Expenses
Receivables	$124.8M	$124.8M	$103.9M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$3.988B	$3.988B	$3.889B
YoY Change	2.56%	2.56%	224.27%
LONG-TERM ASSETS
Property, Plant & Equipment	$271.4M	$372.1M	$126.3M
YoY Change	114.87%	58.28%	17.48%
Goodwill	$2.321B		$2.236B
YoY Change	3.8%		18.81%
Intangibles	$435.7M		$426.7M
YoY Change	2.09%		1.32%
Long-Term Investments			$0.00
YoY Change			-100.0%
Other Assets	$128.7M	$128.7M	$114.1M
YoY Change	12.77%	12.77%	9.71%
Total Long-Term Assets	$3.269B	$3.269B	$3.027B
YoY Change	7.99%	7.99%	14.02%
TOTAL ASSETS
Total Short-Term Assets	$3.988B	$3.988B	$3.889B
Total Long-Term Assets	$3.269B	$3.269B	$3.027B
Total Assets	$7.257B	$7.257B	$6.915B
YoY Change	4.94%	4.94%	79.44%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$22.24M	$22.24M	$15.73M
YoY Change	41.39%	41.68%	105.92%
Accrued Expenses	$81.68M	$189.7M	$110.3M
YoY Change	-25.95%	-15.3%	185.17%
Deferred Revenue	$95.50M		$74.90M
YoY Change	27.5%		11.34%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$338.7M	$338.7M	$330.9M
YoY Change	2.37%	2.35%	59.79%
LONG-TERM LIABILITIES
Long-Term Debt	$987.9M	$987.9M	$986.7M
YoY Change	0.12%	0.13%
Other Long-Term Liabilities	$119.9M	$119.9M	$149.5M
YoY Change	-19.79%	-19.79%	-3.05%
Total Long-Term Liabilities	$987.9M	$1.108B	$986.7M
YoY Change	0.12%	-2.49%
TOTAL LIABILITIES
Total Short-Term Liabilities	$338.7M	$338.7M	$330.9M
Total Long-Term Liabilities	$987.9M	$1.108B	$986.7M
Total Liabilities	$1.545B	$1.545B	$1.540B
YoY Change	0.33%	0.33%	243.46%
SHAREHOLDERS EQUITY
Retained Earnings	$1.460B		$1.168B
YoY Change	25.06%		24.15%
Common Stock	$3.946M		$3.943M
YoY Change	0.08%		977.32%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.712B	$5.712B	$5.375B
YoY Change
Total Liabilities & Shareholders Equity	$7.257B	$7.257B	$6.915B
YoY Change	4.94%	4.94%	79.44%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$92.90M	$292.6M	$35.79M
YoY Change	159.58%	28.81%	-59.3%
Depreciation, Depletion And Amortization	$37.17M	$139.6M	$33.00M
YoY Change	12.63%	19.34%	37.5%
Cash From Operating Activities	$150.5M	$469.7M	$130.8M
YoY Change	15.07%	-3.37%	21.34%
INVESTING ACTIVITIES
Capital Expenditures	-$43.83M	$123.8M	-$6.200M
YoY Change	606.9%		210.0%
Acquisitions		$193.0M
YoY Change		-54.71%
Other Investing Activities	-$40.01M	-$192.4M	-$234.1M
YoY Change	-82.91%	-53.74%	-44.77%
Cash From Investing Activities	-$83.84M	-$381.3M	-$240.3M
YoY Change	-65.11%	-17.84%	-43.58%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$0.00
YoY Change		-100.0%
Debt Paid & Issued, Net		$0.00
YoY Change		-100.0%
Cash From Financing Activities	-1.341M	-$15.68M	-3.600M
YoY Change	-62.75%	-100.59%	80.0%
NET CHANGE
Cash From Operating Activities	150.5M	$469.7M	130.8M
Cash From Investing Activities	-83.84M	-$381.3M	-240.3M
Cash From Financing Activities	-1.341M	-$15.68M	-3.600M
Net Change In Cash	65.33M	$71.21M	-113.1M
YoY Change	-157.77%	-97.35%	-64.67%
FREE CASH FLOW
Cash From Operating Activities	$150.5M	$469.7M	$130.8M
Capital Expenditures	-$43.83M	$123.8M	-$6.200M
Free Cash Flow	$194.3M	$346.0M	$137.0M
YoY Change	41.85%	-28.83%	24.77%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Entity Central Index Key EntityCentralIndexKey	0001057352
CY2021	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
CY2021Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20211231#LeaseAndOtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent Statement Of Financial Position Extensible List OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	http://www.costar.com/20211231#LeaseAndOtherLiabilitiesNoncurrent
CY2021	dei	Document Type DocumentType	10-K
CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	0-24531
CY2021	dei	Entity Registrant Name EntityRegistrantName	CoStar Group, Inc.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	52-2091509
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	1331 L Street, NW
CY2021	dei	Entity Address City Or Town EntityAddressCityOrTown	Washington,
CY2021	dei	Entity Address State Or Province EntityAddressStateOrProvince	DC
CY2021	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	20005
CY2021	dei	City Area Code CityAreaCode	202)
CY2021	dei	Local Phone Number LocalPhoneNumber	346-6500
CY2021	dei	Security12b Title Security12bTitle	Common Stock ($0.01 par value)
CY2021	dei	Trading Symbol TradingSymbol	CSGP
CY2021	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2021	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2021	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2021	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2021	dei	Entity Shell Company EntityShellCompany	false
CY2021Q2	dei	Entity Public Float EntityPublicFloat	28700000000	USD
CY2022Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	394987704	shares
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5709000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	10978000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	11590000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	5097000	USD
CY2021	dei	Auditor Firm AuditorFirmId	42
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Location AuditorLocation	Tysons, Virginia
CY2021	dei	Auditor Name AuditorName	Ernst & Young LLP
CY2021	dei	Auditor Location AuditorLocation	Tysons, Virginia
CY2021	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1944135000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1659019000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1399719000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	1545199000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1540061000	USD
CY2021	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	256711000	USD
CY2021	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	357241000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	308968000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	289239000	USD
CY2021	us-gaap	Gross Profit GrossProfit	1586894000	USD
CY2020	us-gaap	Gross Profit GrossProfit	1350051000	USD
CY2019	us-gaap	Gross Profit GrossProfit	1110480000	USD
CY2021	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	622007000	USD
CY2020	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	535778000	USD
CY2019	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	408596000	USD
CY2021	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	201022000	USD
CY2020	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	162916000	USD
CY2019	us-gaap	Research And Development Expense Software Excluding Acquired In Process Cost ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost	125602000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	299698000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	178740000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	74817000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	62457000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	33995000	USD
CY2021	us-gaap	Operating Expenses OperatingExpenses	1154557000	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	1060849000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	746933000	USD
CY2021	us-gaap	Operating Income Loss OperatingIncomeLoss	432337000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	289202000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	363547000	USD
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-31621000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-17395000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	16742000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3252000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-827000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	10660000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	403968000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	270980000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292564000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	110305000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	390949000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111404000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	43852000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	75986000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	227128000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	314963000	USD
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.59
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	392210000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	380726000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	363096000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	394160000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	383266000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	366301000	shares
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2020	us-gaap	Net Income Loss NetIncomeLoss	227128000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	314963000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4869000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7696000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	0	USD
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CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	189000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-541000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3103000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	287695000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	234824000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	318066000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3827126000	USD
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CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	126325000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	2321015000	USD
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CY2021Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	11283000	USD
CY2020Q4	us-gaap	Income Taxes Receivable Noncurrent IncomeTaxesReceivableNoncurrent	14986000	USD
CY2021Q4	us-gaap	Assets Assets	7256871000	USD
CY2020Q4	us-gaap	Assets Assets	6915420000	USD
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CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	15732000	USD
CY2021Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	81794000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	80998000	USD
CY2021Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	81676000	USD
CY2021Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	31236000	USD
CY2020Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	16316000	USD
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CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	32648000	USD
CY2021Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	95471000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	74851000	USD
CY2021Q4	us-gaap	Liabilities Current LiabilitiesCurrent	338689000	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	330850000	USD
CY2021Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	987944000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	986715000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	986715000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	98656000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	72991000	USD
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CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
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CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
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CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	4204703000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5758000	USD
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CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1167602000	USD
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CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	5375359000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7256871000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6915420000	USD
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CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	3021942000	USD
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CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3103000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	18652000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2019	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	27577000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	51818000	USD
CY2019	csgp	Apic Share Based Payment Arrangement Management Plan APICShareBasedPaymentArrangementManagementPlan	3491000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	7144000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	3405593000	USD
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CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7696000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	21871000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2020	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	38866000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	52624000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	9343000	USD
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CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	116944000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	81165000	USD
CY2020	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1689970000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	5375359000	USD
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CY2021	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	6341000	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	1000	USD
CY2021	csgp	Adjustments To Additional Paid In Capital Restricted Stock Surrendered AdjustmentsToAdditionalPaidInCapitalRestrictedStockSurrendered	33314000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	62585000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	13005000	USD
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	394936000	shares
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CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	5711672000	USD
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CY2020	us-gaap	Net Income Loss NetIncomeLoss	227128000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	314963000	USD
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CY2020	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	60516000	USD
CY2019	us-gaap	Amortization Of Deferred Sales Commissions AmortizationOfDeferredSalesCommissions	53421000	USD
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CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	1658000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	876000	USD
CY2021	csgp	Non Cash Lease Expense NonCashLeaseExpense	28485000	USD
CY2020	csgp	Non Cash Lease Expense NonCashLeaseExpense	26326000	USD
CY2019	csgp	Non Cash Lease Expense NonCashLeaseExpense	22748000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	63709000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	53450000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	52255000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	24165000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-11530000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8220000	USD
CY2021	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10928000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	25212000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10978000	USD
CY2021	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-654000	USD
CY2020	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	288000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	105000	USD
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CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	36118000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	5014000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	14873000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1936000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	14244000	USD
CY2021	csgp	Increase Decrease Deferred Commissions IncreaseDecreaseDeferredCommissions	-72038000	USD
CY2020	csgp	Increase Decrease Deferred Commissions IncreaseDecreaseDeferredCommissions	-64355000	USD
CY2019	csgp	Increase Decrease Deferred Commissions IncreaseDecreaseDeferredCommissions	-66688000	USD
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CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	100846000	USD
CY2021	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	17396000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	2188000	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	7911000	USD
CY2021	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	-502000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	17751000	USD
CY2021	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-30904000	USD
CY2020	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-30497000	USD
CY2019	csgp	Increase Decrease In Lease Liability IncreaseDecreaseInLeaseLiability	-25442000	USD
CY2021	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	5860000	USD
CY2020	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	10352000	USD
CY2019	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-577000	USD
CY2020	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	1762000	USD
CY2019	csgp	Increase Decrease Lease Rightof Useand Other Assets IncreaseDecreaseLeaseRightofUseandOtherAssets	-648000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	469731000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	486106000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	457780000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-464163000	USD
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CY2021	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	612000	USD
CY2020	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	0	USD
CY2019	csgp	Proceeds From Sale Of Property And Equipment And Other Assets ProceedsFromSaleOfPropertyAndEquipmentAndOtherAssets	0	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	123764000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	0	USD
CY2021	csgp	Payments To Acquire Property And Equipment And Other Assets PaymentsToAcquirePropertyAndEquipmentAndOtherAssets	65220000	USD
CY2020	csgp	Payments To Acquire Property And Equipment And Other Assets PaymentsToAcquirePropertyAndEquipmentAndOtherAssets	48347000	USD
CY2021	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	192971000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	426075000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	437556000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-381343000	USD
CY2021	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	18046000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-483753000	USD
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CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1744210000	USD
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CY2021	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	745000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	16647000	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2021	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	33314000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	38867000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	27577000	USD
CY2021	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2020	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	1689971000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	71214000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	2685181000	USD
CY2020	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	30280000	USD
CY2019	csgp	Proceeds From Exercise Of Stock Options And Espp ProceedsFromExerciseOfStockOptionsAndEspp	25080000	USD
CY2021	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-411000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1650000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1657000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-15679000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	2662297000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4154000	USD
CY2021	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-1495000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	941000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	442000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-29685000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3755912000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1070731000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1100416000	USD
CY2021	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	60000	USD
CY2020	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	793000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3827126000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3755912000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1070731000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	31510000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	5948000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	1998000	USD
CY2021	us-gaap	Income Taxes Paid IncomeTaxesPaid	82117000	USD
CY2020	us-gaap	Income Taxes Paid IncomeTaxesPaid	45783000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	68935000	USD
CY2019	csgp	Other Significant Noncash Transaction Amounts Owedfor Acquisitions OtherSignificantNoncashTransactionAmountsOwedforAcquisitions	1650000	USD
CY2021	csgp	Capital Expenditures Incurred But Not Yet Paid And Noncash Landlord Incentives CapitalExpendituresIncurredButNotYetPaidAndNoncashLandlordIncentives	2117000	USD
CY2020	csgp	Capital Expenditures Incurred But Not Yet Paid And Noncash Landlord Incentives CapitalExpendituresIncurredButNotYetPaidAndNoncashLandlordIncentives	2364000	USD
CY2019	csgp	Capital Expenditures Incurred But Not Yet Paid And Noncash Landlord Incentives CapitalExpendituresIncurredButNotYetPaidAndNoncashLandlordIncentives	2160000	USD
CY2021	us-gaap	Nature Of Operations NatureOfOperations	ORGANIZATION <div style="text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">CoStar Group, Inc. (the “Company” or “CoStar”) provides information, analytics, online marketplace and auction services to the commercial real estate and related business community through its comprehensive, proprietary database of commercial real estate information and related tools. The Company provides online marketplaces for commercial real estate, apartment rentals, residential real estate, land for sale and businesses for sale, and its services are typically distributed to its clients under subscription-based agreements that typically renew automatically, a majority of which have a term of at least one year. The Company operates within two operating segments, North America, which includes the United States (“U.S.”) and Canada, and International, which primarily includes Europe, Asia-Pacific and Latin America. </span></div><div style="text-align:justify;text-indent:18pt"><span><br/></span></div><div style="text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">On June 24, 2020, the Company acquired Ten-X Holding Company, Inc. and its subsidiaries ("Ten-X"), which operate an online auction platform for commercial real estate. On October 26, 2020, the Company acquired Emporis GmbH, a Germany-based provider of international commercial real estate data and images. On December 22, 2020, the Company acquired Homesnap, Inc. (“Homesnap”), which operates an online mobile software platform for residential real estate agents and brokers. On May 24, 2021, the Company acquired Homes Group, LLC ("Homes.com"), a residential real estate advertising and marketing services company primarily operating through its property listing and marketing portal, Homes.com. On October 1, 2021, the Company acquired Comreal Info, a French </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">société par actions simplifiée </span><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">("BureauxLocaux"), the owner and operator of BureauxLocaux, a leading commercial real estate digital marketplace in France. See Note 5 for further discussion of these acquisitions.</span></div>
CY2021	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2021	us-gaap	Use Of Estimates UseOfEstimates	Use of EstimatesThe preparation of financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. On an ongoing basis, the Company evaluates its estimates and assumptions, including those related to revenue recognition, allowance for credit losses, the useful lives and recoverability of long-lived and intangible assets, goodwill, income taxes, accounting for business combinations, stock-based compensation, estimating the Company's incremental borrowing rate for its leases, and contingencies, among others. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable, including assumptions as to future events. These estimates form the basis for making judgments about the carrying values of assets and liabilities and recorded revenues and expenses. Actual results could differ from these estimates.
CY2021	csgp	Subscription Based Licensing Agreement Minimum Term Years SubscriptionBasedLicensingAgreementMinimumTermYears	P1Y
CY2021	csgp	Deferred Sales Commission Amortization Period DeferredSalesCommissionAmortizationPeriod	P3Y
CY2021	csgp	Deferred Sales Commission Amortization Period DeferredSalesCommissionAmortizationPeriod	P3Y
CY2021	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	300000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-200000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-600000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-5758000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-889000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5758000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-889000	USD
CY2021	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	312000000	USD
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CY2020	csgp	Commissions Incurred CommissionsIncurred	97183000	USD
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CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	4548000	USD
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CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	84833000	USD
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CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14884000	USD
CY2021	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-4995000	USD
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CY2021	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	13070000	USD
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CY2021	csgp	Effective Income Tax Rate Reconciliation Excess Tax Benefit Amount EffectiveIncomeTaxRateReconciliationExcessTaxBenefitAmount	10933000	USD
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CY2019	csgp	Effective Income Tax Rate Reconciliation Change In Tax Reserves Amount EffectiveIncomeTaxRateReconciliationChangeInTaxReservesAmount	3135000	USD
CY2021	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	10369000	USD
CY2020	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	5949000	USD
CY2019	csgp	Effective Income Tax Rate Reconciliation Nondeductible Expense Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseCompensationAmount	1777000	USD
CY2021	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	34854000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Restructuring Charges IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges	0	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2121000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	5034000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2254000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111404000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	43852000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	75986000	USD
CY2021Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	14000000	USD
CY2020Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	5000000	USD
CY2019Q4	csgp	Realized Tax Benefits Related To Operating Loss Carryforward RealizedTaxBenefitsRelatedToOperatingLossCarryforward	6000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22372000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3487000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	440000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	832000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25467000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4213000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	452000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1259000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28873000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3024000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5353000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	9924000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1866000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14754000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	15000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	29000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	10000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	2000000	USD
CY2021	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	-400000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	600000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	600000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	29678000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments Year One LongTermDebtMaturityInterestPaymentsYearOne	28000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	36477000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments Year Two LongTermDebtMaturityInterestPaymentsYearTwo	28000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	32808000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments Year Three LongTermDebtMaturityInterestPaymentsYearThree	28000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	16051000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments Year Four LongTermDebtMaturityInterestPaymentsYearFour	28000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	7235000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments Year Five LongTermDebtMaturityInterestPaymentsYearFive	28000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	11901000	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1000000000	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments After Year Five LongTermDebtMaturityInterestPaymentsAfterYearFive	112000000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	134150000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	1000000000	USD
CY2021Q4	csgp	Long Term Debt Maturity Interest Payments LongTermDebtMaturityInterestPayments	252000000	USD
CY2021	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	operating_segment
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	564981000	USD
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	564981000	USD
CY2020	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	406146000	USD
CY2019	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	444712000	USD
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1976100	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	227128000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	314963000	USD
CY2021	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	28809000	USD
CY2020	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	25675000	USD
CY2019	csgp	Amortization Of Intangible Assets Costof Revenue AmortizationOfIntangibleAssetsCostofRevenue	21357000	USD
CY2021	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	74817000	USD
CY2020	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	62457000	USD
CY2019	csgp	Amortization Of Intangible Assets Net Of Adjustments AmortizationOfIntangibleAssetsNetOfAdjustments	33995000	USD
CY2021	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	29018000	USD
CY2020	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	28812000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	25813000	USD
CY2021	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-31621000	USD
CY2020	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-17395000	USD
CY2019	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	16742000	USD
CY2021	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3252000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-827000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	10660000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111404000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	43852000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	75986000	USD
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	564981000	USD
CY2021	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	564981000	USD
CY2020	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	406146000	USD
CY2019	csgp	Netincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortization Ebitda NetincomelossbeforeinterestandotherincomeexpenseincometaxesdepreciationandamortizationEBITDA	444712000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	271431000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	126325000	USD
CY2021Q4	us-gaap	Goodwill Goodwill	2321015000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	2235999000	USD
CY2021Q4	us-gaap	Assets Assets	7256871000	USD
CY2020Q4	us-gaap	Assets Assets	6915420000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	1545199000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1540061000	USD
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1200000000	shares
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	csgp	Dividends Common Stock Shares DividendsCommonStockShares	9	shares
CY2021Q2	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021	us-gaap	Net Income Loss NetIncomeLoss	292564000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	227128000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	314963000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	392210000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	380726000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	380726000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	363096000	shares
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1950000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2540000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3205000	shares
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	394160000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	383266000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	366301000	shares
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.60
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.59
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.86
CY2021	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	373000	shares
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	540000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	425000	shares
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	20000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	17000000	USD
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P6Y2M26D
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	39.18
CY2021Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	1473420	shares
CY2021Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	29.55
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2021Q2	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	10
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	1
CY2019	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2020	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2021	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	18000000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	15000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2019	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	USD
CY2020	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	USD
CY2021	us-gaap	Defined Contribution Plan Administrative Expenses DefinedContributionPlanAdministrativeExpenses	0	USD
CY2021Q4	csgp	Percentage Of Purchase Price Of Companys Common Stock To Market Price PercentageOfPurchasePriceOfCompanysCommonStockToMarketPrice	0.90
CY2021Q2	csgp	Increase In Shares Of Common Stock Issued Pursuant To Stock Plan IncreaseInSharesOfCommonStockIssuedPursuantToStockPlan	1000000	shares
CY2021Q4	csgp	Shares Available Employee Stock Purchase Plan SharesAvailableEmployeeStockPurchasePlan	1233863	shares
CY2020Q4	csgp	Shares Available Employee Stock Purchase Plan SharesAvailableEmployeeStockPurchasePlan	385910	shares
CY2021	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	152047	shares
CY2020	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	129930	shares
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	87239000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	55382000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	67766000	USD
CY2021	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	22859000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-9599000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6881000	USD
CY2021	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8467000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-926000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2424000	USD
CY2021	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7161000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1005000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1085000	USD
CY2021	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	24165000	USD
CY2020	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-11530000	USD
CY2019	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	8220000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	111404000	USD

Files In Submission

Name	View Source	Status
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$CSGP
COSTAR GROUP, INC. Stock $csgp

2021 Q4 Form 10-K Financial Statement

#000105735222000027 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP COSTAR GROUP, INC. Stock $csgp

2021 Q4 Form 10-K Financial Statement

#000105735222000027 Filed on February 23, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CSGP
COSTAR GROUP, INC. Stock $csgp