$EXR
Extra Space Storage Inc. Stock $exr

$exr Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000104746913001942 Filed on February 28, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$93.21M	$84.10M	$78.04M
YoY Change	27.34%	16.8%	13.43%
Cost Of Revenue	$26.70M	$24.27M	$22.71M
YoY Change	11.25%	5.06%	1.39%
Gross Profit	$66.50M	$59.83M	$55.33M
YoY Change	35.44%	22.35%	19.24%
Gross Profit Margin	71.34%	71.14%	70.9%
Selling, General & Admin	$13.30M	$12.30M	$12.40M
YoY Change	15.65%	16.04%	10.71%
% of Gross Profit	20.0%	20.56%	22.41%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$16.00M	$14.36M	$14.09M
YoY Change	21.21%	14.91%	15.51%
% of Gross Profit	24.06%	24.01%	25.47%
Operating Expenses	$29.20M	$26.70M	$26.50M
YoY Change	17.74%	6.37%	12.77%
Operating Profit	$34.38M	$31.22M	$25.85M
YoY Change	41.48%	31.16%	12.89%
Interest Expense	-$15.40M	$16.76M	$16.26M
YoY Change	28.33%	-228.89%	-218.69%
% of Operating Profit	-44.79%	53.68%	62.9%
Other Income/Expense, Net
YoY Change
Pretax Income	$19.00M	$15.42M	$10.55M
YoY Change	63.79%	45.44%	15.96%
Income Tax	$600.0K	-$62.00K	$411.0K
% Of Pretax Income	3.16%	-0.4%	3.89%
Net Earnings	$18.41M	$17.35M	$12.52M
YoY Change	106.9%	125.35%	101.89%
Net Earnings / Revenue	19.75%	20.63%	16.04%
Basic Earnings Per Share	$0.17	$0.16	$0.12
Diluted Earnings Per Share	$0.17	$0.16	$0.12
COMMON SHARES
Basic Shares Outstanding		94.31M shares	91.44M shares
Diluted Shares Outstanding		98.87M shares	96.01M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$26.50M	$33.90M	$35.20M
YoY Change	-43.38%	55.5%	23.94%
Cash & Equivalents	$26.48M	$33.90M	$35.19M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$18.50M	$61.20M	$8.500M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$45.00M	$95.10M	$43.70M
YoY Change	-41.02%	43.44%	-34.68%
LONG-TERM ASSETS
Property, Plant & Equipment	$2.264B	$2.060B	$2.046B
YoY Change	16.87%	10.27%	9.85%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$130.4M	$134.2M	$138.0M
YoY Change	-7.25%	-6.87%	-9.8%
Other Assets	$25.80M	$30.40M	$32.70M
YoY Change	-47.67%	-41.76%	-38.19%
Total Long-Term Assets	$2.473B	$2.279B	$2.267B
YoY Change	13.76%	8.07%	7.34%
TOTAL ASSETS
Total Short-Term Assets	$45.00M	$95.10M	$43.70M
Total Long-Term Assets	$2.473B	$2.279B	$2.267B
Total Assets	$2.518B	$2.374B	$2.311B
YoY Change	11.9%	9.15%	6.05%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$46.40M	$39.90M	$32.70M
YoY Change	31.82%	6.68%	1.55%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change	-100.0%	-100.0%	-100.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$46.40M	$39.90M	$32.70M
YoY Change	9.95%	-10.74%	-16.15%
LONG-TERM LIABILITIES
Long-Term Debt	$1.364B	$1.242B	$1.190B
YoY Change	9.37%	6.04%	0.74%
Other Long-Term Liabilities	$33.80M	$30.00M	$29.00M
YoY Change	56.48%	20.0%	60.22%
Total Long-Term Liabilities	$1.398B	$1.272B	$1.219B
YoY Change	10.17%	6.34%	1.64%
TOTAL LIABILITIES
Total Short-Term Liabilities	$46.40M	$39.90M	$32.70M
Total Long-Term Liabilities	$1.398B	$1.272B	$1.219B
Total Liabilities	$1.444B	$1.367B	$1.307B
YoY Change	5.51%	5.25%	0.5%
SHAREHOLDERS EQUITY
Retained Earnings	-$264.1M
YoY Change
Common Stock	$1.291B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.019B	$1.007B	$1.004B
YoY Change
Total Liabilities & Shareholders Equity	$2.518B	$2.374B	$2.311B
YoY Change	11.9%	9.15%	6.05%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$18.41M	$17.35M	$12.52M
YoY Change	106.9%	125.35%	101.89%
Depreciation, Depletion And Amortization	$16.00M	$14.36M	$14.09M
YoY Change	21.21%	14.91%	15.51%
Cash From Operating Activities	$43.50M	$35.50M	$35.20M
YoY Change	44.52%	24.13%	16.94%
INVESTING ACTIVITIES
Capital Expenditures	-$87.80M	-$29.20M	-$82.40M
YoY Change	65.66%	56.15%	207.46%
Acquisitions
YoY Change
Other Investing Activities	$5.100M	-$44.40M	$7.500M
YoY Change	34.21%	-662.03%	-186.21%
Cash From Investing Activities	-$82.70M	-$73.60M	-$74.90M
YoY Change	68.09%	581.48%	110.99%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$112.3M
YoY Change			3410.91%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	31.80M	36.80M	32.40M
YoY Change	-27.89%	-250.82%	-143.2%
NET CHANGE
Cash From Operating Activities	43.50M	35.50M	35.20M
Cash From Investing Activities	-82.70M	-73.60M	-74.90M
Cash From Financing Activities	31.80M	36.80M	32.40M
Net Change In Cash	-7.400M	-1.300M	-7.300M
YoY Change	-129.6%	-80.3%	-90.92%
FREE CASH FLOW
Cash From Operating Activities	$43.50M	$35.50M	$35.20M
Capital Expenditures	-$87.80M	-$29.20M	-$82.40M
Free Cash Flow	$131.3M	$64.70M	$117.6M
YoY Change	58.0%	36.79%	106.68%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012Q2	dei	Entity Public Float EntityPublicFloat	2990113517	USD
CY2012Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	106313000	USD
CY2011Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	130410000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	30785000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26484000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	16976000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	25768000	USD
CY2012Q4	us-gaap	Due From Related Parties DueFromRelatedParties	11078000	USD
CY2011Q4	us-gaap	Due From Related Parties DueFromRelatedParties	18517000	USD
CY2012Q4	us-gaap	Assets Assets	3223477000	USD
CY2011Q4	us-gaap	Assets Assets	2517524000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	1369690000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	937001000	USD
CY2012Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-3319000	USD
CY2011Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-4402000	USD
CY2012Q4	us-gaap	Other Notes Payable OtherNotesPayable	119590000	USD
CY2011Q4	us-gaap	Other Notes Payable OtherNotesPayable	119590000	USD
CY2011Q4	us-gaap	Convertible Debt ConvertibleDebt	87663000	USD
CY2012Q4	us-gaap	Line Of Credit LineOfCredit	85000000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	215000000	USD
CY2012Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	52299000	USD
CY2011Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	46353000	USD
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	48248000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	33754000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	1678146000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	1443763000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	1107000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	948000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1740037000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	1290021000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-14273000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-7936000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-235064000	USD
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	87324104	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	92097008	shares
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-264086000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	1491807000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	121908000	USD
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	102290200	shares
CY2011	exr	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	3049935	shares
CY2010	exr	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	3356963	shares
CY2012	exr	Incremental Common Shares Attributable To Conversion Of Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfOperatingPartnershipUnits	2755650	shares
CY2011	exr	Incremental Common Shares Attributable To Conversion Of Preferred Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfPreferredOperatingPartnershipUnits	989980	shares
CY2010	exr	Incremental Common Shares Attributable To Conversion Of Preferred Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfPreferredOperatingPartnershipUnits	989980	shares
CY2012	exr	Incremental Common Shares Attributable To Conversion Of Preferred Operating Partnership Units IncrementalCommonSharesAttributableToConversionOfPreferredOperatingPartnershipUnits	989980	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	487185	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	546585	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	379406	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	106523015	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	92050453	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	96683508	shares
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.14
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	2573731000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	3379512000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	319302000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	391928000	USD
CY2011Q4	exr	Net Operating Real Estate Assets NetOperatingRealEstateAssets	2254429000	USD
CY2011Q4	us-gaap	Development In Process DevelopmentInProcess	9366000	USD
CY2012Q4	exr	Net Operating Real Estate Assets NetOperatingRealEstateAssets	2987584000	USD
CY2012Q4	us-gaap	Development In Process DevelopmentInProcess	4138000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2263795000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	2991722000	USD
CY2011Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	7875000	USD
CY2012Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	8600000	USD
CY2012	us-gaap	Finite Lived Intangible Assets Average Useful Life FiniteLivedIntangibleAssetsAverageUsefulLife	18
CY2011	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	2633000	USD
CY2010	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	907000	USD
CY2012	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	7068000	USD
CY2011	us-gaap	Interest Expense InterestExpense	67301000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1761000	USD
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	1.21
CY2012	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	450787000	USD
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.61
CY2011	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	392932000	USD
CY2012	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	1.20
CY2012	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	124248000	USD
CY2011	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.60
CY2011	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	56454000	USD
CY2012	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	29381000	USD
CY2012	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	9225000	USD
CY2011Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	12146000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8847000	USD
CY2011Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	3424000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	15386000	USD
CY2011Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	5265000	USD
CY2011Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	15536000	USD
CY2011Q4	exr	Investments In Trusts InvestmentsInTrusts	3590000	USD
CY2011Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	2447000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3603000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	52550000	USD
CY2012Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	15090000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10223000	USD
CY2012Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	3434000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	19783000	USD
CY2012Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	7934000	USD
CY2012Q4	us-gaap	Accounts Receivable Net AccountsReceivableNet	19881000	USD
CY2012Q4	exr	Investments In Trusts InvestmentsInTrusts	3590000	USD
CY2012Q4	us-gaap	Income Tax Receivable IncomeTaxReceivable	3609000	USD
CY2012Q4	us-gaap	Other Assets OtherAssets	66603000	USD
CY2010	exr	Income Tax Credits And Adjustments Federal IncomeTaxCreditsAndAdjustmentsFederal	-832000	USD
CY2010	exr	Interest Income On Note Receivable From Preferred Partnership Unit Holders InterestIncomeOnNoteReceivableFromPreferredPartnershipUnitHolders	4850000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>1. DESCRIPTION OF BUSINESS</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Extra Space Storage Inc. (the "Company") is a self-administered and self-managed real estate investment trust ("REIT"), formed as a Maryland Corporation on April 30, 2004, to own, operate, manage, acquire, develop and redevelop professionally managed self-storage facilities located throughout the United States. The Company continues the business of Extra Space Storage LLC and its subsidiaries, which had engaged in the self-storage business since 1977. The Company's interest in its properties is held through its operating partnership, Extra Space Storage LP (the "Operating Partnership"), which was formed on May 5, 2004. The Company's primary assets are general partner and limited partner interests in the Operating Partnership. This structure is commonly referred to as an umbrella partnership REIT, or UPREIT. The Company has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (the "Internal Revenue Code"). To the extent the Company continues to qualify as a REIT, it will not be subject to tax, with certain limited exceptions, on the taxable income that is distributed to its stockholders.</font></p> <p style="FONT-FAMILY: times"><font size="2">        The Company invests in self-storage facilities by acquiring wholly-owned facilities or by acquiring an equity interest in real estate entities. At December 31, 2012, the Company had direct and indirect equity interests in 729 storage facilities. In addition, the Company managed 181 properties third parties bringing the total number of properties which it owns and/or manages to 910, located in 34 states, Washington, D.C. and Puerto Rico.</font></p> <p style="FONT-FAMILY: times"><font size="2">        The Company operates in three distinct segments: (1) property management, acquisition and development; (2) rental operations; and (3) tenant reinsurance. The Company's property management, acquisition and development activities include managing, acquiring, developing and redeveloping self-storage facilities. The rental operations activities include rental operations of self-storage facilities. No single tenant accounts for more than 5% of rental income. Tenant reinsurance activities include the reinsurance of risks relating to the loss of goods stored by tenants in the Company's self-storage facilities.</font></p></div>
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	1018947000	USD
CY2012Q4	us-gaap	Minority Interest In Preferred Unit Holders MinorityInterestInPreferredUnitHolders	29918000	USD
CY2011Q4	us-gaap	Minority Interest In Preferred Unit Holders MinorityInterestInPreferredUnitHolders	29695000	USD
CY2012Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	22492000	USD
CY2011Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	24018000	USD
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CY2012Q4	us-gaap	Other Minority Interests OtherMinorityInterests	1114000	USD
CY2011Q4	us-gaap	Other Minority Interests OtherMinorityInterests	1101000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1545331000	USD
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CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
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CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
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CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	300000000	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	94783590	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	94783590	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	110737205	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	110737205	shares
CY2011Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	100000000	USD
CY2012Q4	us-gaap	Due From Related Parties Noncurrent DueFromRelatedPartiesNoncurrent	100000000	USD
CY2012	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	346874000	USD
CY2011	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	268725000	USD
CY2010	us-gaap	Operating Leases Income Statement Minimum Lease Revenue OperatingLeasesIncomeStatementMinimumLeaseRevenue	232447000	USD
CY2012	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	36816000	USD
CY2011	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	31181000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	25928000	USD
CY2012	us-gaap	Management Fees Revenue ManagementFeesRevenue	25706000	USD
CY2011	us-gaap	Management Fees Revenue ManagementFeesRevenue	29924000	USD
CY2010	us-gaap	Management Fees Revenue ManagementFeesRevenue	23122000	USD
CY2012	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	409396000	USD
CY2011	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	329830000	USD
CY2010	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	281497000	USD
CY2012	us-gaap	Cost Of Revenue CostOfRevenue	114028000	USD
CY2011	us-gaap	Cost Of Revenue CostOfRevenue	95481000	USD
CY2010	us-gaap	Cost Of Revenue CostOfRevenue	86165000	USD
CY2012	exr	Tenant Reinsurance Expense TenantReinsuranceExpense	7869000	USD
CY2011	exr	Tenant Reinsurance Expense TenantReinsuranceExpense	6143000	USD
CY2010	exr	Tenant Reinsurance Expense TenantReinsuranceExpense	6505000	USD
CY2012	exr	Acquisition Related Costs AcquisitionRelatedCosts	5351000	USD
CY2011	exr	Acquisition Related Costs AcquisitionRelatedCosts	2896000	USD
CY2010	exr	Acquisition Related Costs AcquisitionRelatedCosts	1235000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	444000	USD
CY2011	us-gaap	Severance Costs SeveranceCosts	2137000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	50454000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	49683000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	44428000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	74453000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5413000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1155000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	58014000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	50349000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	252155000	USD
CY2011	us-gaap	Costs And Expenses CostsAndExpenses	214354000	USD
CY2010	us-gaap	Costs And Expenses CostsAndExpenses	190682000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	157241000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	115476000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	90815000	USD
CY2012	us-gaap	Interest Expense InterestExpense	71850000	USD
CY2010	us-gaap	Interest Expense InterestExpense	64116000	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	1664000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	-1270000	USD
CY2012	us-gaap	Investment Income Interest InvestmentIncomeInterest	1816000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	1027000	USD
CY2010	us-gaap	Investment Income Interest InvestmentIncomeInterest	898000	USD
CY2012	exr	Interest Income On Note Receivable From Preferred Partnership Unit Holders InterestIncomeOnNoteReceivableFromPreferredPartnershipUnitHolders	4850000	USD
CY2011	exr	Interest Income On Note Receivable From Preferred Partnership Unit Holders InterestIncomeOnNoteReceivableFromPreferredPartnershipUnitHolders	4850000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	4356000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	91613000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	52291000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	30783000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	10859000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7287000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	6753000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4162000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	127689000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	58423000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	33374000	USD
CY2012	us-gaap	Minority Interest In Net Income Loss Preferred Unit Holders MinorityInterestInNetIncomeLossPreferredUnitHolders	6876000	USD
CY2011	us-gaap	Minority Interest In Net Income Loss Preferred Unit Holders MinorityInterestInNetIncomeLossPreferredUnitHolders	6289000	USD
CY2010	us-gaap	Minority Interest In Net Income Loss Preferred Unit Holders MinorityInterestInNetIncomeLossPreferredUnitHolders	6048000	USD
CY2012	exr	Minority Interest In Net Income Loss Operating Partnerships And Other MinorityInterestInNetIncomeLossOperatingPartnershipsAndOther	3504000	USD
CY2011	exr	Minority Interest In Net Income Loss Operating Partnerships And Other MinorityInterestInNetIncomeLossOperatingPartnershipsAndOther	1685000	USD
CY2010	exr	Minority Interest In Net Income Loss Operating Partnerships And Other MinorityInterestInNetIncomeLossOperatingPartnershipsAndOther	995000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	5757000	USD
CY2012	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-6587000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-2237000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-4963000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	121102000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	56186000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	28411000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	4580000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	10130000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	7886000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6811000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	110972000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	48300000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21600000	USD
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5889000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	5583000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	4354000	USD
CY2010	exr	Loss On Sublease LossOnSublease	2000000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-2581000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-7008000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments Net Of Dividends Or Distributions IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions	-6722000	USD
CY2012	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-7439000	USD
CY2011	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	8634000	USD
CY2012Q4	exr	Lease Obligation Liability LeaseObligationLiability	3826000	USD
CY2011Q4	exr	Lease Obligation Liability LeaseObligationLiability	5828000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	144164000	USD
CY2010	us-gaap	Increase Decrease In Due From Related Parties Current IncreaseDecreaseInDueFromRelatedPartiesCurrent	-3011000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-8746000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-7533000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2002000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1118000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1676000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	7220000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	9837000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	1856000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-1419000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	215879000	USD
CY2010	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	69588000	USD
CY2012	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	3759000	USD
CY2011	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	7060000	USD
CY2010	us-gaap	Payments For Construction In Process PaymentsForConstructionInProcess	36062000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-251919000	USD
CY2010	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	15750000	USD
CY2012	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1423000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	104815000	USD
CY2012	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	601727000	USD
CY2011	us-gaap	Payments To Acquire Commercial Real Estate PaymentsToAcquireCommercialRealEstate	194959000	USD
CY2011	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	4088000	USD
CY2010	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	9699000	USD
CY2012	exr	Return Of Investment Real Estate Ventures ReturnOfInvestmentRealEstateVentures	2421000	USD
CY2011	exr	Return Of Investment Real Estate Ventures ReturnOfInvestmentRealEstateVentures	4614000	USD
CY2010	exr	Return Of Investment Real Estate Ventures ReturnOfInvestmentRealEstateVentures	8802000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-8792000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-4730000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-9036000	USD
CY2012	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	7875000	USD
CY2011	us-gaap	Payments To Acquire Notes Receivable PaymentsToAcquireNotesReceivable	50140000	USD
CY2012	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	3367000	USD
CY2011	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	5016000	USD
CY2010	us-gaap	Payments To Acquire Furniture And Fixtures PaymentsToAcquireFurnitureAndFixtures	1945000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-606938000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-83706000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	429588000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	112349000	USD
CY2012	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	87663000	USD
CY2012	exr	Proceeds From Notes Payable And Lines Of Credit ProceedsFromNotesPayableAndLinesOfCredit	1074263000	USD
CY2011	exr	Proceeds From Notes Payable And Lines Of Credit ProceedsFromNotesPayableAndLinesOfCredit	475487000	USD
CY2010	exr	Proceeds From Notes Payable And Lines Of Credit ProceedsFromNotesPayableAndLinesOfCredit	191062000	USD
CY2012	exr	Payments Of Notes Payable And Lines Of Credit PaymentsOfNotesPayableAndLinesOfCredit	921831000	USD
CY2011	exr	Payments Of Notes Payable And Lines Of Credit PaymentsOfNotesPayableAndLinesOfCredit	452347000	USD
CY2010	exr	Payments Of Notes Payable And Lines Of Credit PaymentsOfNotesPayableAndLinesOfCredit	252400000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	11607000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	6197000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4160000	USD
CY2012	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	155000	USD
CY2011	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	271000	USD
CY2010	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	4116000	USD
CY2012	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	10267000	USD
CY2011	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	18622000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5661000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	88287000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	52027000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	34964000	USD
CY2012	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	9215000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	8127000	USD
CY2010	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	7479000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	395360000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	87489000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-106309000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	46750000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	131950000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	65687000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	61726000	USD
CY2010	exr	Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired NoncashOrPartNoncashAcquisitionNetRealEstateAssetsAcquired	25963000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	150284000	USD
CY2011	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	132327000	USD
CY2010	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	25963000	USD
CY2011Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Liabilities Incurred BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurred	4850000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-85200000	USD
CY2011	exr	Redemption Of Operating Partnership Units For Common Stock Including Additional Paid In Capital RedemptionOfOperatingPartnershipUnitsForCommonStockIncludingAdditionalPaidInCapital	2344000	USD
CY2012	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	3476000	USD
CY2011	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	2199000	USD
CY2010	us-gaap	Proceeds And Excess Tax Benefit From Sharebased Compensation ProceedsAndExcessTaxBenefitFromSharebasedCompensation	836000	USD
CY2012	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	3476000	USD
CY2011	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	2199000	USD
CY2010	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	836000	USD
CY2012	exr	Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired NoncashOrPartNoncashAcquisitionNetRealEstateAssetsAcquired	159297000	USD
CY2011	exr	Noncash Or Part Noncash Acquisition Net Real Estate Assets Acquired NoncashOrPartNoncashAcquisitionNetRealEstateAssetsAcquired	137177000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	60100000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	831000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	665000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	6539000	USD
CY2010	exr	Real Estate Assets RealEstateAssets	-42739000	USD
CY2010	exr	Investment In Real Estate Ventures InvestmentInRealEstateVentures	404000	USD
CY2010	exr	Related Party Receivables RelatedPartyReceivables	21142000	USD
CY2010	exr	Other Assets And Other Liabilities OtherAssetsAndOtherLiabilities	-51000	USD
CY2010	exr	Notes Payable Non Cash NotesPayableNonCash	21348000	USD
CY2010	exr	Other Noncontrolling Interests OtherNoncontrollingInterests	-104000	USD
CY2012	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	2479000	USD
CY2011	us-gaap	Conversion Of Stock Amount Converted1 ConversionOfStockAmountConverted1	2344000	USD
CY2012	exr	Redemption Of Operating Partnership Units For Common Stock Including Additional Paid In Capital RedemptionOfOperatingPartnershipUnitsForCommonStockIncludingAdditionalPaidInCapital	2479000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	4301000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-20266000	USD
CY2012Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	729	property
CY2012Q4	exr	Number Of Real Estate Properties Franchisees And Others NumberOfRealEstatePropertiesFranchiseesAndOthers	181	property
CY2012Q4	exr	Number Of Real Estate Properties Owned And Or Managed NumberOfRealEstatePropertiesOwnedAndOrManaged	910	property
CY2012Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	34	state
CY2012	exr	Reporting Segments Number ReportingSegmentsNumber	3	segment
CY2012	exr	Maximum Percentage Of Rental Income Accounted For By Single Tenant MaximumPercentageOfRentalIncomeAccountedForBySingleTenant	0.05	pure
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Use of Estimates</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></p></div>
CY2012	us-gaap	Comparability Of Prior Year Financial Data ComparabilityOfPriorYearFinancialData	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>Reclassifications</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Certain amounts in the 2011 and 2010 financial statements and supporting note disclosures have been reclassified to conform to the current year presentation. Such reclassifications did not impact previously reported net income or accumulated deficit.</font></p></div>
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	752000	USD
CY2010	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	2013000	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	Extra Space Storage Inc.
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001289490
CY2012	dei	Document Type DocumentType	10-K
CY2012	exr	Number Of Leased Properties That Cannot Be Classified As Ground Or Building Leases NumberOfLeasedPropertiesThatCannotBeClassifiedAsGroundOrBuildingLeases	3	property
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	exr	Number Of Properties Related To Ground Leases Assumed By The Entity At Rates Lower Than Current Market Rates NumberOfPropertiesRelatedToGroundLeasesAssumedByTheEntityAtRatesLowerThanCurrentMarketRates	5	property
CY2012	exr	Economic Risk Number Of Components EconomicRiskNumberOfComponents	3	component
CY2012	exr	Expected Benefit Period For Amortization Of Direct Response Advertising Costs ExpectedBenefitPeriodForAmortizationOfDirectResponseAdvertisingCosts	12
CY2011Q4	us-gaap	Prepaid Advertising PrepaidAdvertising	860000	USD
CY2011	us-gaap	Advertising Expense AdvertisingExpense	5958000	USD
CY2010	us-gaap	Advertising Expense AdvertisingExpense	6430000	USD
CY2012	us-gaap	Advertising Expense AdvertisingExpense	6026000	USD
CY2012	exr	Percentage Of Annual Reit Taxable Income Distributable To Stockholders Minimum PercentageOfAnnualREITTaxableIncomeDistributableToStockholdersMinimum	0.90	pure
CY2012	exr	Percentage Of All Distributions To Stockholders Which Classifies As Return Of Capital PercentageOfAllDistributionsToStockholdersWhichClassifiesAsReturnOfCapital	0.00	pure
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	107523	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1788142	shares
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	57335	shares
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	50449000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	26331000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	117309000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-7978000	USD
CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-7096000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-10349000	USD
CY2011	exr	Income Loss Attributable To Noncontrolling Interest Fixed Component IncomeLossAttributableToNoncontrollingInterestFixedComponent	5750000	USD
CY2010	exr	Income Loss Attributable To Noncontrolling Interest Fixed Component IncomeLossAttributableToNoncontrollingInterestFixedComponent	5750000	USD
CY2012	exr	Income Loss Attributable To Noncontrolling Interest Fixed Component IncomeLossAttributableToNoncontrollingInterestFixedComponent	5750000	USD
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	110742088	shares
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	52677000	USD
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	27677000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	946219000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	939071000	USD
CY2010	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	5661000	USD
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	18622000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	10267000	USD
CY2010	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	4000	USD
CY2011	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	2000	USD
CY2012	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	2000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	112349000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	429588000	USD
CY2012	exr	Stock Issued During Period Value Settlement Of Exchangeable Senior Notes StockIssuedDuringPeriodValueSettlementOfExchangeableSeniorNotes	7000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4580000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5757000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	4356000	USD
CY2010	us-gaap	Stockholders Equity Other StockholdersEquityOther	-104000	USD
CY2012	exr	Partner Capital Account Units Issued PartnerCapitalAccountUnitsIssued	429000	USD
CY2010	exr	Minority Interest Decrease From Cash Redemptions MinorityInterestDecreaseFromCashRedemptions	4116000	USD
CY2011	exr	Minority Interest Decrease From Cash Redemptions MinorityInterestDecreaseFromCashRedemptions	271000	USD
CY2012	exr	Minority Interest Decrease From Cash Redemptions MinorityInterestDecreaseFromCashRedemptions	155000	USD
CY2010	exr	Adjustments In Investments From Other Noncontrolling Interests AdjustmentsInInvestmentsFromOtherNoncontrollingInterests	-87000	USD
CY2010	exr	Noncontrolling Interests Increase From Purchase Of Interests NoncontrollingInterestsIncreaseFromPurchaseOfInterests	223000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-4963000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-2237000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-6587000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	836000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	2199000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	3476000	USD
CY2010	exr	Adjustments To Additional Paid In Capital Tax Effect From Contribution Of Property To Subsidiary AdjustmentsToAdditionalPaidInCapitalTaxEffectFromContributionOfPropertyToSubsidiary	-495000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	7479000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	8098000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9197000	USD
CY2011	exr	Minority Interest Decrease From Distributions To Other Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOtherNoncontrollingInterestHolders	29000	USD
CY2012	exr	Minority Interest Decrease From Distributions To Other Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToOtherNoncontrollingInterestHolders	18000	USD
CY2010	us-gaap	Dividends Common Stock DividendsCommonStock	34964000	USD
CY2011	us-gaap	Dividends Common Stock DividendsCommonStock	52027000	USD
CY2012	us-gaap	Dividends Common Stock DividendsCommonStock	88287000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.85
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.56
CY2010	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.40
CY2012Q4	us-gaap	Derivative Lower Fixed Interest Rate Range DerivativeLowerFixedInterestRateRange	0.0279	pure
CY2012Q4	us-gaap	Derivative Higher Fixed Interest Rate Range DerivativeHigherFixedInterestRateRange	0.0698	pure
CY2012	exr	Interest Rate Cash Flow Hedge Increase Decrease In Interest Expenses Due To Interest Payments InterestRateCashFlowHedgeIncreaseDecreaseInInterestExpensesDueToInterestPayments	-6758000	USD
CY2011	exr	Interest Rate Cash Flow Hedge Increase Decrease In Interest Expenses Due To Interest Payments InterestRateCashFlowHedgeIncreaseDecreaseInInterestExpensesDueToInterestPayments	-3771000	USD
CY2010	exr	Interest Rate Cash Flow Hedge Increase Decrease In Interest Expenses Due To Interest Payments InterestRateCashFlowHedgeIncreaseDecreaseInInterestExpensesDueToInterestPayments	-3078000	USD
CY2012	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-6917000	USD
CY2011	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	-2237000	USD
CY2012	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-6758000	USD
CY2011	us-gaap	Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net InterestRateCashFlowHedgeGainLossReclassifiedToEarningsNet	-3771000	USD
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	15228000	USD
CY2011Q4	us-gaap	Interest Rate Cash Flow Hedge Liability At Fair Value InterestRateCashFlowHedgeLiabilityAtFairValue	8311000	USD
CY2012	exr	Equity Method Investment Income Loss Excess Purchase Price Amortization Amount EquityMethodInvestmentIncomeLossExcessPurchasePriceAmortizationAmount	25713000	USD
CY2012Q4	exr	Equity Method Investment Summarized Financial Information Real Estate Investment Property Net EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet	1629402000	USD
CY2011Q4	exr	Equity Method Investment Summarized Financial Information Real Estate Investment Property Net EquityMethodInvestmentSummarizedFinancialInformationRealEstateInvestmentPropertyNet	1971431000	USD
CY2012Q4	exr	Equity Method Investment Summarized Financial Information Other Assets EquityMethodInvestmentSummarizedFinancialInformationOtherAssets	33103000	USD
CY2011Q4	exr	Equity Method Investment Summarized Financial Information Other Assets EquityMethodInvestmentSummarizedFinancialInformationOtherAssets	48728000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	1662505000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	2020159000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	85000000	USD
CY2012Q4	exr	Equity Method Investment Summarized Financial Information Secured Debt EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt	404630000	USD
CY2011Q4	exr	Equity Method Investment Summarized Financial Information Secured Debt EquityMethodInvestmentSummarizedFinancialInformationSecuredDebt	615561000	USD
CY2012Q4	exr	Equity Method Investment Summarized Financial Information Other Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities	27383000	USD
CY2011Q4	exr	Equity Method Investment Summarized Financial Information Other Liabilities EquityMethodInvestmentSummarizedFinancialInformationOtherLiabilities	37558000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1234492000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Equity EquityMethodInvestmentSummarizedFinancialInformationEquity	1367040000	USD
CY2012Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	1666505000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities And Equity EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity	2020159000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	266222000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	304499000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	297658000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	164285000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	217114000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Cost Of Sales EquityMethodInvestmentSummarizedFinancialInformationCostOfSales	211283000	USD
CY2012	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	101937000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	87385000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	86375000	USD
CY2012	exr	Equity Method Investment Excess Purchase Price Amortization Period EquityMethodInvestmentExcessPurchasePriceAmortizationPeriod	40
CY2012Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	15228000	USD
CY2011Q4	us-gaap	Interest Rate Derivative Liabilities At Fair Value InterestRateDerivativeLiabilitiesAtFairValue	8311000	USD
CY2012Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	8442000	USD
CY2011Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	4708000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	1747000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	240000000	USD
CY2012Q4	us-gaap	Deferred Revenue Leases Net DeferredRevenueLeasesNet	20752000	USD
CY2011Q4	us-gaap	Deferred Revenue Leases Net DeferredRevenueLeasesNet	14907000	USD
CY2011Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	549000	USD
CY2011Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	5335423	shares
CY2012	exr	Common Stock Voting Rights Votes Number CommonStockVotingRightsVotesNumber	1	Vote
CY2012Q4	exr	Maximum Percentage Of Annual Salary Which Plan Participants May Contribute To The Plan MaximumPercentageOfAnnualSalaryWhichPlanParticipantsMayContributeToThePlan	0.15	pure
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	884000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	832000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	805000	USD
CY2011Q4	exr	Asset Management Fees Receivable AssetManagementFeesReceivable	5327000	USD
CY2012	us-gaap	Property Management Fee Percent Fee PropertyManagementFeePercentFee	0.06	pure
CY2011Q2	exr	Common Stock Offer Price Per Share CommonStockOfferPricePerShare	21.16
CY2011Q2	exr	Gross Proceeds From Issuance Of Common Stock GrossProceedsFromIssuanceOfCommonStock	112898000	USD
CY2012	exr	Percentage Of Matching Contribution Made By Company For First Three Percent Of Participants Compensation PercentageOfMatchingContributionMadeByCompanyForFirstThreePercentOfParticipantsCompensation	1.00	pure
CY2012	exr	Maximum Percentage Of Compensation By Plan Participants Subject To Hundred Percent Matching Of Company MaximumPercentageOfCompensationByPlanParticipantsSubjectToHundredPercentMatchingOfCompany	0.03	pure
CY2012	exr	Percentage Of Matching Contribution Made By Company For Next Two Percent Of Participants Compensation PercentageOfMatchingContributionMadeByCompanyForNextTwoPercentOfParticipantsCompensation	0.50	pure
CY2012	exr	Maximum Percentage Of Compensation By Plan Participants Subject To Fifty Percent Matching Of Company MaximumPercentageOfCompensationByPlanParticipantsSubjectToFiftyPercentMatchingOfCompany	0.02	pure
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	612000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8852000	USD
CY2012	exr	Income Tax Credits And Adjustments Federal IncomeTaxCreditsAndAdjustmentsFederal	-5528000	USD
CY2012	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-5528000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2089000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2089000	USD
CY2012	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	4801000	USD
CY2011	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	606000	USD
CY2012	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	612000	USD
CY2010	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	124000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1350000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	606000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1956000	USD
CY2011	exr	Income Tax Credits And Adjustments Federal IncomeTaxCreditsAndAdjustmentsFederal	-6849000	USD
CY2011	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-6849000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6048000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	6048000	USD
CY2011	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	549000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3588000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	124000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3712000	USD
CY2010	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	4038000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	20854000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	14957000	USD
CY2012Q4	exr	Deferred Tax Assets Tax Deferred Captive Insurance Subsidiary DeferredTaxAssetsTaxDeferredCaptiveInsuranceSubsidiary	385000	USD
CY2010	us-gaap	Income Tax Credits And Adjustments IncomeTaxCreditsAndAdjustments	-832000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	1282000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1282000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	617000	USD
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1298000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	6849000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	192000	USD
CY2012	us-gaap	Common Stock Voting Rights CommonStockVotingRights	All holders of the Company's common stock are entitled to receive dividends and to one vote on all matters submitted to a vote of stockholders.
CY2012Q4	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	5980000	shares
CY2012Q2	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	8050000	shares
CY2012Q4	exr	Common Stock Offer Price Per Share CommonStockOfferPricePerShare	33.98
CY2012Q2	exr	Common Stock Offer Price Per Share CommonStockOfferPricePerShare	28.22
CY2012Q4	exr	Gross Proceeds From Issuance Of Common Stock GrossProceedsFromIssuanceOfCommonStock	203200000	USD
CY2012Q2	exr	Gross Proceeds From Issuance Of Common Stock GrossProceedsFromIssuanceOfCommonStock	227171000	USD
CY2012Q4	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	300000	USD
CY2012Q2	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	483000	USD
CY2011Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	112349000	USD
CY2012Q4	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	202900000	USD
CY2012Q2	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	226688000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	8240000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	46586000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	37729000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	612000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	1641000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	5528000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-169000	USD
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.251	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.010	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.022	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.115	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.019	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.283	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.005	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.012	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.042	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.041	pure
CY2011Q4	exr	Deferred Tax Assets Tax Deferred Captive Insurance Subsidiary DeferredTaxAssetsTaxDeferredCaptiveInsuranceSubsidiary	232000	USD
CY2011Q4	exr	Deferred Tax Assets Fixed Assets DeferredTaxAssetsFixedAssets	-6455000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1542000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	6849000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1955000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	2691000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	6814000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3211000	USD
CY2012Q4	exr	Deferred Tax Assets Fixed Assets DeferredTaxAssetsFixedAssets	-10791000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	1721000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	10313000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	1610000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	4402000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	7640000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	4135000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3505000	USD
CY2011	us-gaap	Interest And Debt Expense InterestAndDebtExpense	69062000	USD
CY2010	us-gaap	Interest And Debt Expense InterestAndDebtExpense	65780000	USD
CY2012	us-gaap	Interest And Debt Expense InterestAndDebtExpense	72294000	USD
CY2012Q4	exr	Real Estate Self Storage Properties Ground Leases Number RealEstateSelfStoragePropertiesGroundLeasesNumber	18	Facility
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	7463000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	7330000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5206000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	4072000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	2783000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	42542000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	69396000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2799000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2416000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	2830000	USD
CY2011Q4	us-gaap	Litigation Reserve LitigationReserve	1800000	USD
CY2011Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	84097000	USD
CY2011Q4	us-gaap	Costs And Expenses CostsAndExpenses	58833000	USD
CY2011Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	93212000	USD
CY2012Q4	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	113667000	USD
CY2012Q1	us-gaap	Costs And Expenses CostsAndExpenses	58217000	USD
CY2012Q2	us-gaap	Costs And Expenses CostsAndExpenses	57076000	USD
CY2011Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	74481000	USD
CY2011Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	78040000	USD
CY2012Q3	us-gaap	Costs And Expenses CostsAndExpenses	66307000	USD
CY2012Q4	us-gaap	Costs And Expenses CostsAndExpenses	70555000	USD
CY2012Q1	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	90987000	USD
CY2012Q2	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	94951000	USD
CY2012Q3	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	109791000	USD
CY2011Q1	us-gaap	Costs And Expenses CostsAndExpenses	50451000	USD
CY2011Q2	us-gaap	Costs And Expenses CostsAndExpenses	52188000	USD
CY2011Q3	us-gaap	Costs And Expenses CostsAndExpenses	52882000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	24030000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	25852000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	31215000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	34379000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	32770000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	37875000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	43484000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	43112000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	10140000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	12517000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	17352000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	18414000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	22518000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	24745000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	41553000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	38873000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	8301000	USD
CY2011Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10609000	USD
CY2011Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15261000	USD
CY2011Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	16278000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	20214000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22413000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	38606000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	36076000	USD
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.09
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.17
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.37
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.17
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.37
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2553769	shares
CY2012	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit	6.22
CY2012	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit	28.79
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	1097092	shares
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1	5.50
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Exercise Price Beginning Balance1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1	13.89
CY2012Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	724368	shares
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	2616035000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	3383650000	USD
CY2012Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	14.37
CY2012Q4	us-gaap	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	3194952000	USD
CY2010Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	1972402000	USD
CY2010	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	87000	USD
CY2012Q4	exr	Variable Interest Entity Not Primary Beneficiary Number And Not Consolidated Number VariableInterestEntityNotPrimaryBeneficiaryNumberAndNotConsolidatedNumber	3	entity
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	391928000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Carrying Costs RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts	175903000	USD
CY2012Q4	exr	Real Estate And Accumulated Depreciation Land Adjustments RealEstateAndAccumulatedDepreciationLandAdjustments	-3816000	USD
CY2012Q4	exr	Real Estate And Accumulated Depreciation Building Adjustments RealEstateAndAccumulatedDepreciationBuildingAdjustments	9478000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	767615000	USD
CY2012	exr	Number Of Real Estate Properties Acquired NumberOfRealEstatePropertiesAcquired	91	property
CY2011	exr	Number Of Real Estate Properties Acquired NumberOfRealEstatePropertiesAcquired	55	property
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	761648000	USD
CY2011Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	297166000	USD
CY2012	exr	Gain Loss On Purchase Of Joint Venture Partners Interest GainLossOnPurchaseOfJointVenturePartnersInterest	23670000	USD
CY2012	exr	Real Estate Property Acquisition Previous Equity Interest RealEstatePropertyAcquisitionPreviousEquityInterest	17539000	USD
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	563107000	USD
CY2011Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	158335000	USD
CY2011	exr	Real Estate Property Acquisition Previous Equity Interest RealEstatePropertyAcquisitionPreviousEquityInterest	1817000	USD
CY2012Q4	exr	Real Estate Property Acquisition Assets Acquired Liabilities Assumed Net RealEstatePropertyAcquisitionAssetsAcquiredLiabilitiesAssumedNet	1965000	USD
CY2011Q4	exr	Real Estate Property Acquisition Assets Acquired Liabilities Assumed Net RealEstatePropertyAcquisitionAssetsAcquiredLiabilitiesAssumedNet	163000	USD
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable	429000	USD
CY2012	us-gaap	Business Acquisition Equity Interests Issued Or Issuable Number Of Shares Issued BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	16007	shares
CY2012Q4	exr	Real Estate Property Acquisition Purchase Price Allocation Land RealEstatePropertyAcquisitionPurchasePriceAllocationLand	168259000	USD
CY2011Q4	exr	Real Estate Property Acquisition Purchase Price Allocation Land RealEstatePropertyAcquisitionPurchasePriceAllocationLand	76008000	USD
CY2012Q4	exr	Real Estate Property Acquisition Purchase Price Allocation Building RealEstatePropertyAcquisitionPurchasePriceAllocationBuilding	573500000	USD
CY2011Q4	exr	Real Estate Property Acquisition Purchase Price Allocation Building RealEstatePropertyAcquisitionPurchasePriceAllocationBuilding	215164000	USD
CY2012Q4	us-gaap	Business Acquisition Purchase Price Allocation Amortizable Intangible Assets BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets	16570000	USD
CY2011Q4	us-gaap	Business Acquisition Purchase Price Allocation Amortizable Intangible Assets BusinessAcquisitionPurchasePriceAllocationAmortizableIntangibleAssets	5035000	USD
CY2012	exr	Real Estate Property Acquisition Closing Costs Expensed RealEstatePropertyAcquisitionClosingCostsExpensed	3319000	USD
CY2011	exr	Real Estate Property Acquisition Closing Costs Expensed RealEstatePropertyAcquisitionClosingCostsExpensed	959000	USD
CY2012	exr	Number Of Self Storage Properties NumberOfSelfStorageProperties	1	property
CY2012Q4	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	15569000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	1369690000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	770764000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	2430654000	USD
CY2012Q4	exr	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Land RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionLand	667000	USD
CY2012	exr	Gain Loss On Sale Of Real Estate Assets And Purchase Of Partners Interests GainLossOnSaleOfRealEstateAssetsAndPurchaseOfPartnersInterests	30630000	USD
CY2012Q1	exr	Percentage Of Joint Venture Owned Prior To Dissolution And Final Distribution PercentageOfJointVentureOwnedPriorToDissolutionAndFinalDistribution	0.40	pure
CY2012Q4	exr	Percentage Of Joint Venture Owned Prior To Dissolution And Final Distribution PercentageOfJointVentureOwnedPriorToDissolutionAndFinalDistribution	0.20	pure
CY2012Q4	exr	Number Of Joint Ventures Dissolved NumberOfJointVenturesDissolved	2	item
CY2012Q4	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	7600000	USD
CY2012Q4	exr	Real Estate Property Acquisition Notes Receivable From Seller Amount Forgiven RealEstatePropertyAcquisitionNotesReceivableFromSellerAmountForgiven	8584000	USD
CY2012Q4	exr	Gain Recognized From Dissolution Of Joint Venture And Final Distrbution GainRecognizedFromDissolutionOfJointVentureAndFinalDistrbution	1409000	USD
CY2012Q1	exr	Gain Recognized From Dissolution Of Joint Venture And Final Distrbution GainRecognizedFromDissolutionOfJointVentureAndFinalDistrbution	5550000	USD
CY2012	exr	Number Of Acquired Property Included In Pro Forma Financial Information Out Of Total Properties NumberOfAcquiredPropertyIncludedInProFormaFinancialInformationOutOfTotalProperties	77	item
CY2012	exr	Number Of Acquired Property Excluded From Pro Forma Financial Information NumberOfAcquiredPropertyExcludedFromProFormaFinancialInformation	14	item
CY2012Q4	us-gaap	Business Acquisition Cost Of Acquired Entity Liabilities Incurred BusinessAcquisitionCostOfAcquiredEntityLiabilitiesIncurred	8584000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Future Minimum Sublease Rentals OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals	3826000	USD

Files In Submission

Name	View Source	Status
0001047469-13-001942-index-headers.html	Edgar Link	pending
0001047469-13-001942-index.html	Edgar Link	pending
0001047469-13-001942.txt	Edgar Link	pending
0001047469-13-001942-xbrl.zip	Edgar Link	pending
a2213217z10-k.htm	Edgar Link	pending
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exr-20121231.xml	Edgar Link	completed
exr-20121231.xsd	Edgar Link	pending
exr-20121231_cal.xml	Edgar Link	unprocessable
exr-20121231_def.xml	Edgar Link	unprocessable
exr-20121231_lab.xml	Edgar Link	unprocessable
exr-20121231_pre.xml	Edgar Link	unprocessable
FilingSummary.xml	Edgar Link	unprocessable
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$EXR
Extra Space Storage Inc. Stock $exr

2011 Q4 Form 10-K Financial Statement

#000104746913001942 Filed on February 28, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXR Extra Space Storage Inc. Stock $exr

2011 Q4 Form 10-K Financial Statement

#000104746913001942 Filed on February 28, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EXR
Extra Space Storage Inc. Stock $exr