$EQR
EQUITY RESIDENTIAL Stock $eqr

$eqr Overview Financials Valuation SEC Filings Company Website

2012 Q1 Form 10-Q Financial Statement

#000090610712000012 Filed on May 03, 2012

Income Statement

Concept	2012 Q1	2011 Q1
Revenue	$446.4M	$389.7M
YoY Change	14.56%	-6.51%
Cost Of Revenue	$163.9M	$178.7M
YoY Change	-8.28%	0.17%
Gross Profit	$266.4M	$283.8M
YoY Change	-6.13%	13.16%
Gross Profit Margin	59.67%	72.82%
Selling, General & Admin	$13.70M	$11.40M
YoY Change	20.18%	6.54%
% of Gross Profit	5.14%	4.02%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$148.2M	$158.5M
YoY Change	-6.44%	3.77%
% of Gross Profit	55.65%	55.83%
Operating Expenses	$157.5M	$168.9M
YoY Change	-6.75%	11.93%
Operating Profit	$102.1M	$90.80M
YoY Change	12.45%	-5.25%
Interest Expense	-$120.4M	-$122.4M
YoY Change	-1.63%	6.9%
% of Operating Profit	-117.91%	-134.8%
Other Income/Expense, Net	$2.600M	$2.200M
YoY Change	18.18%	-150.0%
Pretax Income	-$13.26M	-$8.729M
YoY Change	51.86%	-54.3%
Income Tax	$170.0K	$184.0K
% Of Pretax Income
Net Earnings	$145.3M	$127.3M
YoY Change	14.11%	120.08%
Net Earnings / Revenue	32.55%	32.67%
Basic Earnings Per Share	$0.47	$0.42
Diluted Earnings Per Share	$0.47	$0.42
COMMON SHARES
Basic Shares Outstanding	298.8M shares	292.9M shares
Diluted Shares Outstanding	298.8M shares	292.9M shares

Balance Sheet

Concept	2012 Q1	2011 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$220.0M	$306.0M
YoY Change	-28.1%	410.0%
Cash & Equivalents	$219.6M	$306.1M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$220.0M	$306.0M
YoY Change	-28.1%	410.0%
LONG-TERM ASSETS
Property, Plant & Equipment	$15.88B	$15.27B
YoY Change	3.97%	1.41%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$15.00M	$4.000M
YoY Change	275.0%	-33.33%
Other Assets	$239.0M	$361.0M
YoY Change	-33.8%	58.33%
Total Long-Term Assets	$16.26B	$15.77B
YoY Change	3.12%	2.01%
TOTAL ASSETS
Total Short-Term Assets	$220.0M	$306.0M
Total Long-Term Assets	$16.26B	$15.77B
Total Assets	$16.48B	$16.08B
YoY Change	2.53%	3.59%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$77.00M	$80.00M
YoY Change	-3.75%	-15.79%
Accrued Expenses	$79.00M	$72.00M
YoY Change	9.72%	4.35%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$331.0M	$319.0M
YoY Change	3.76%	-3.04%
LONG-TERM LIABILITIES
Long-Term Debt	$9.413B	$9.677B
YoY Change	-2.73%	1.92%
Other Long-Term Liabilities	$261.0M	$261.0M
YoY Change	0.0%	3.57%
Total Long-Term Liabilities	$9.674B	$9.938B
YoY Change	-2.66%	1.96%
TOTAL LIABILITIES
Total Short-Term Liabilities	$331.0M	$319.0M
Total Long-Term Liabilities	$9.674B	$9.938B
Total Liabilities	$10.01B	$10.80B
YoY Change	-7.33%	2.86%
SHAREHOLDERS EQUITY
Retained Earnings	$656.0M
YoY Change
Common Stock	$3.005M
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.822B	$5.279B
YoY Change
Total Liabilities & Shareholders Equity	$16.48B	$16.08B
YoY Change	2.53%	3.59%

Cashflow Statement

Concept	2012 Q1	2011 Q1
OPERATING ACTIVITIES
Net Income	$145.3M	$127.3M
YoY Change	14.11%	120.08%
Depreciation, Depletion And Amortization	$148.2M	$158.5M
YoY Change	-6.44%	3.77%
Cash From Operating Activities	$234.2M	$187.5M
YoY Change	24.91%	20.6%
INVESTING ACTIVITIES
Capital Expenditures	-$251.4M	-$186.3M
YoY Change	34.94%	-66.47%
Acquisitions	$0.00
YoY Change
Other Investing Activities	$169.6M	$148.3M
YoY Change	14.36%	-46.56%
Cash From Investing Activities	-$81.87M	-$38.01M
YoY Change	115.4%	-86.34%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$152.1M	$154.5M
YoY Change	-1.59%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$316.7M	-$274.9M
YoY Change	15.21%	2542.87%
NET CHANGE
Cash From Operating Activities	$234.2M	$187.5M
Cash From Investing Activities	-$81.87M	-$38.01M
Cash From Financing Activities	-$316.7M	-$274.9M
Net Change In Cash	-$164.3M	-$125.3M
YoY Change	31.08%	-5.83%
FREE CASH FLOW
Cash From Operating Activities	$234.2M	$187.5M
Capital Expenditures	-$251.4M	-$186.3M
Free Cash Flow	$485.6M	$373.8M
YoY Change	29.91%	-47.44%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-196718000	USD
CY2012Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-189973000	USD
CY2012Q1	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5152975000	USD
CY2011Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5047186000	USD
CY2012Q1	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	30225000	USD
CY2012Q1	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	-1567000	USD
CY2011Q1	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	373000	USD
CY2012Q1	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	3429000	USD
CY2011Q1	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	822000	USD
CY2011Q1	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	3005000	USD
CY2012Q1	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	2974000	USD
CY2012Q1	us-gaap	Assets Assets	16481247000	USD
CY2011Q4	us-gaap	Assets Assets	16659303000	USD
CY2011Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	81948000	USD
CY2012Q1	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	64758000	USD
CY2012Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	675000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	675000	USD
CY2012Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1514000	USD
CY2011Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1550000	USD
CY2012Q1	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	0	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	0	USD
CY2012Q1	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	839000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	875000	USD
CY2012Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Purchase Price BusinessAcquisitionCostOfAcquiredEntityPurchasePrice	182840000	USD
CY2012Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1592000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	158912000	USD
CY2006Q3	us-gaap	Convertible Debt ConvertibleDebt	650000000	USD
CY2011Q3	us-gaap	Convertible Debt ConvertibleDebt	482500000	USD
CY2011Q1	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	105047000	USD
CY2012Q1	us-gaap	Cost Of Property Repairs And Maintenance CostOfPropertyRepairsAndMaintenance	112379000	USD
CY2012Q1	us-gaap	Costs And Expenses CostsAndExpenses	381507000	USD
CY2011Q1	us-gaap	Costs And Expenses CostsAndExpenses	350403000	USD
CY2012Q1	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.06625
CY2012Q1	us-gaap	Debt Instrument Interest Rate Stated Percentage Rate Range Maximum DebtInstrumentInterestRateStatedPercentageRateRangeMaximum	0.1125
CY2012Q1	us-gaap	Debt Instrument Interest Rate Stated Percentage Rate Range Minimum DebtInstrumentInterestRateStatedPercentageRateRangeMinimum	0.0009
CY2012Q1	us-gaap	Debt Instrument Maturity Date Range End DebtInstrumentMaturityDateRangeEnd	2026
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	44608000	USD
CY2012Q1	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	45861000	USD
CY2011Q1	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	481000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	219628000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	383921000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	431408000	USD
CY2011Q1	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	306072000	USD
CY2012Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-164293000	USD
CY2011Q1	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-125336000	USD
CY2012Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3375
CY2011Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.3375
CY2012Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	1000000000	shares
CY2012Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	300522169	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	297508185	shares
CY2012Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	300522169	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	297508185	shares
CY2012Q1	us-gaap	Common Stock Value CommonStockValue	3005000	USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	2975000	USD
CY2011Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	134515000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	152044000	USD
CY2011Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5735000	USD
CY2012Q1	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6868000	USD
CY2011Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	140250000	USD
CY2012Q1	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	31700000	USD
CY2011Q1	us-gaap	Depreciation Depreciation	158455000	USD
CY2012Q1	us-gaap	Depreciation Depreciation	174737000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	8972000	USD
CY2012Q1	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	7672000	USD
CY2011Q1	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2012Q1	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	29061000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	32278000	USD
CY2012Q1	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2011Q1	us-gaap	Derivative Instruments Gain Recognized In Other Comprehensive Income Effective Portion DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion	6082000	USD
CY2012Q1	us-gaap	Derivative Instruments Gain Recognized In Other Comprehensive Income Effective Portion DerivativeInstrumentsGainRecognizedInOtherComprehensiveIncomeEffectivePortion	3218000	USD
CY2011Q1	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	-956000	USD
CY2012Q1	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	-3563000	USD
CY2011Q4	us-gaap	Development In Process DevelopmentInProcess	160190000	USD
CY2012Q1	us-gaap	Development In Process DevelopmentInProcess	185621000	USD
CY2012Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	132956000	USD
CY2011Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	123754000	USD
CY2012Q1	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-80000	USD
CY2011Q1	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-42000	USD
CY2012Q1	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	-7000	USD
CY2011Q1	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	-522000	USD
CY2011Q1	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	41300000	USD
CY2012Q1	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	1047000	USD
CY2011Q1	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	18857000	USD
CY2012Q1	us-gaap	Disposal Group Including Discontinued Operation Operating Income Loss DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	1884000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	71606000	USD
CY2011Q1	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	60157000	USD
CY2012Q1	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	2931000	USD
CY2012Q1	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	109043000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	179079000	USD
CY2011Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3466000	USD
CY2012Q1	us-gaap	Dividends Preferred Stock DividendsPreferredStock	3466000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.475
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.423
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.470
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.423
CY2012Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	89000	USD
CY2011Q1	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	41000	USD
CY2012Q1	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	0.20
CY2011Q4	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	1292124000	USD
CY2012Q1	us-gaap	Fixtures And Equipment Gross FixturesAndEquipmentGross	1311696000	USD
CY2012Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	13688000	USD
CY2011Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	11433000	USD
CY2012Q1	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	582000	USD
CY2011Q1	us-gaap	Income Loss Attributable To Noncontrolling Interest IncomeLossAttributableToNoncontrollingInterest	-543000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	-11796000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	12891000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	17580000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-8729000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	17389000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-8913000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	-0.040
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.043
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.043
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	-0.040
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	134778000	USD
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	141979000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	128942000	USD
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	135661000	USD
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.463
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.432
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.427
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.463
CY2012Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	191000	USD
CY2011Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	184000	USD
CY2011Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	341000	USD
CY2012Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	560000	USD
CY2012Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	41616000	USD
CY2011Q1	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	44531000	USD
CY2011Q1	us-gaap	Increase Decrease In Fair Value Of Hedged Item In Interest Rate Fair Value Hedge IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge	1492000	USD
CY2012Q1	us-gaap	Increase Decrease In Fair Value Of Hedged Item In Interest Rate Fair Value Hedge IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge	1300000	USD
CY2011Q1	us-gaap	Increase Decrease In Fair Value Of Interest Rate Fair Value Hedging Instruments IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments	-1492000	USD
CY2012Q1	us-gaap	Increase Decrease In Fair Value Of Interest Rate Fair Value Hedging Instruments IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments	-1300000	USD
CY2011Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-26659000	USD
CY2012Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-8632000	USD
CY2011Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-5771000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-12262000	USD
CY2012Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-16878000	USD
CY2011Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-28836000	USD
CY2012Q1	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	2768000	USD
CY2011Q1	us-gaap	Increase Decrease In Restricted Cash For Operating Activities IncreaseDecreaseInRestrictedCashForOperatingActivities	-1557000	USD
CY2012Q1	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	182000	USD
CY2011Q1	us-gaap	Increase Decrease In Security Deposits IncreaseDecreaseInSecurityDeposits	-28000	USD
CY2012Q1	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	0	USD
CY2011	us-gaap	Interest And Dividend Income Securities Available For Sale InterestAndDividendIncomeSecuritiesAvailableForSale	0	USD
CY2011Q1	us-gaap	Interest And Other Income InterestAndOtherIncome	1011000	USD
CY2012Q1	us-gaap	Interest And Other Income InterestAndOtherIncome	172000	USD
CY2012Q1	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-4996000	USD
CY2012Q1	us-gaap	Interest Paid Net InterestPaidNet	125435000	USD
CY2012Q1	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	79489000	USD
CY2012Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	118703000	USD
CY2011Q1	us-gaap	Interest Expense Debt InterestExpenseDebt	120528000	USD
CY2011Q1	us-gaap	Interest Paid Net InterestPaidNet	146514000	USD
CY2011Q1	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	-1700000	USD
CY2011Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	88121000	USD
CY2012Q1	us-gaap	Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet	19600000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	14262616000	USD
CY2012Q1	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	14294619000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	12327000	USD
CY2012Q1	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	14803000	USD
CY2012Q1	us-gaap	Land Land	4384200000	USD
CY2011Q4	us-gaap	Land Land	4367816000	USD
CY2011Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	325200000	USD
CY2012Q1	us-gaap	Land Available For Development LandAvailableForDevelopment	360955000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	10380042000	USD
CY2012Q1	us-gaap	Liabilities Liabilities	10005069000	USD
CY2012Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16481247000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	16659303000	USD
CY2011Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	103704000	USD
CY2012Q1	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	84633000	USD
CY2012Q1	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	0	USD
CY2011Q1	us-gaap	Loans Assumed1 LoansAssumed1	26900000	USD
CY2012Q1	us-gaap	Loans Assumed1 LoansAssumed1	0	USD
CY2011Q1	us-gaap	Management Fees Revenue ManagementFeesRevenue	1806000	USD
CY2012Q1	us-gaap	Management Fees Revenue ManagementFeesRevenue	2064000	USD
CY2012Q1	us-gaap	Minority Interest MinorityInterest	196946000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	193842000	USD
CY2012Q1	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	37603000	USD
CY2012Q1	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	6418000	USD
CY2011Q1	us-gaap	Minority Interest In Net Income Loss Operating Partnerships MinorityInterestInNetIncomeLossOperatingPartnerships	5775000	USD
CY2011Q4	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	119536000	USD
CY2012Q1	us-gaap	Minority Interest In Operating Partnerships MinorityInterestInOperatingPartnerships	123031000	USD
CY2012Q1	us-gaap	Minority Interest Ownership Percentage By Parent MinorityInterestOwnershipPercentageByParent	0.957
CY2011Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-274858000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-316636000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-82684000	USD
CY2011Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-38006000	USD
CY2011Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	187528000	USD
CY2012Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	235027000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	145299000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	127331000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	123865000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	141833000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	148251000	USD
CY2011Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	123865000	USD
CY2011Q1	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	1683000	USD
CY2012Q1	us-gaap	Noncash Project Abandonment Costs NoncashProjectAbandonmentCosts	1034000	USD
CY2012Q1	us-gaap	Notes Payable NotesPayable	5355590000	USD
CY2011Q4	us-gaap	Notes Payable NotesPayable	5609574000	USD
CY2012Q1	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	427
CY2012Q1	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	14
CY2012Q1	us-gaap	Number Of Units In Real Estate Property NumberOfUnitsInRealEstateProperty	121011
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	146152000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	115953000	USD
CY2012Q1	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	525595000	USD
CY2011Q1	us-gaap	Operating Leases Income Statement Lease Revenue OperatingLeasesIncomeStatementLeaseRevenue	464550000	USD
CY2011Q4	us-gaap	Other Assets OtherAssets	187155000	USD
CY2012Q1	us-gaap	Other Assets OtherAssets	129248000	USD
CY2011Q4	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	1550000	USD
CY2012Q1	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	1514000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	6745000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	7184000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-956000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax OtherComprehensiveIncomeReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax	-3563000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	6082000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3218000	USD
CY2011Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	146000	USD
CY2012Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-36000	USD
CY2011Q1	us-gaap	Other Expenses OtherExpenses	2200000	USD
CY2012Q1	us-gaap	Other Expenses OtherExpenses	2600000	USD
CY2012Q1	us-gaap	Other Liabilities OtherLiabilities	261448000	USD
CY2011Q4	us-gaap	Other Liabilities OtherLiabilities	291289000	USD
CY2011Q4	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	71426000	USD
CY2012Q1	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	55572000	USD
CY2012Q1	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	7067000	USD
CY2011Q1	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	2160000	USD
CY2012Q1	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	23409000	USD
CY2011Q1	us-gaap	Owned Property Management Costs OwnedPropertyManagementCosts	22381000	USD
CY2012Q1	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	30225000	USD
CY2011Q1	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	29891000	USD
CY2011Q1	us-gaap	Payments For Proceeds From Deposits On Real Estate Acquisitions PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	107878000	USD
CY2012Q1	us-gaap	Payments For Proceeds From Deposits On Real Estate Acquisitions PaymentsForProceedsFromDepositsOnRealEstateAcquisitions	27386000	USD
CY2012Q1	us-gaap	Payments For Proceeds From Mortgage Deposits PaymentsForProceedsFromMortgageDeposits	-209000	USD
CY2011Q1	us-gaap	Payments For Proceeds From Mortgage Deposits PaymentsForProceedsFromMortgageDeposits	22297000	USD
CY2011Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	132655000	USD
CY2012Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	168350000	USD
CY2012Q1	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	7657000	USD
CY2011Q1	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	6225000	USD
CY2011Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	3466000	USD
CY2012Q1	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	3466000	USD
CY2012Q1	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4227000	USD
CY2011Q1	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	223000	USD
CY2011	us-gaap	Payments Of Merger Related Costs Financing Activities PaymentsOfMergerRelatedCostsFinancingActivities	2600000	USD
CY2012Q1	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	1887000	USD
CY2011Q1	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	2352000	USD
CY2012Q1	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	0	USD
CY2011Q1	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	504000	USD
CY2012Q1	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	2396000	USD
CY2011Q1	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	366000	USD
CY2012Q1	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	183112000	USD
CY2011Q1	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	123868000	USD
CY2012Q1	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	35876000	USD
CY2011Q1	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	29840000	USD
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q1	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2012Q1	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	100000000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	1600000	shares
CY2012Q1	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	1600000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	1600000	shares
CY2012Q1	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	1600000	shares
CY2011Q4	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	200000000	USD
CY2012Q1	us-gaap	Preferred Stock Value Outstanding PreferredStockValueOutstanding	200000000	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	152058000	USD
CY2011Q1	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	154508000	USD
CY2012Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2011Q1	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	707000	USD
CY2011Q1	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	0	USD
CY2012Q1	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	921000	USD
CY2012Q1	us-gaap	Proceeds From Partnership Contribution ProceedsFromPartnershipContribution	5000	USD
CY2011Q1	us-gaap	Proceeds From Partnership Contribution ProceedsFromPartnershipContribution	0	USD
CY2012Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-51770000	USD
CY2011Q1	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	258212000	USD
CY2012Q1	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	204272000	USD
CY2011Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	32719000	USD
CY2012Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	18938000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	152167000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	133066000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	15554740000	USD
CY2012Q1	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	15606315000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	4539583000	USD
CY2012Q1	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	4658994000	USD
CY2011Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	20407946000	USD
CY2012Q1	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	20537091000	USD
CY2012Q1	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	15878097000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	15868363000	USD
CY2012Q1	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	55987000	USD
CY2011Q1	us-gaap	Real Estate Taxes And Insurance RealEstateTaxesAndInsurance	52139000	USD
CY2012Q1	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	253858000	USD
CY2011Q1	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	93096000	USD
CY2012Q1	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	182182000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	152237000	USD
CY2012Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	656001000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	615572000	USD
CY2012Q1	us-gaap	Revenues Revenues	527659000	USD
CY2011Q1	us-gaap	Revenues Revenues	466356000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	4111487000	USD
CY2012Q1	us-gaap	Secured Debt SecuredDebt	4056976000	USD
CY2011Q4	us-gaap	Security Deposit Liability SecurityDepositLiability	65286000	USD
CY2012Q1	us-gaap	Security Deposit Liability SecurityDepositLiability	65468000	USD
CY2012Q1	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	525595000	USD
CY2011Q1	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	464550000	USD
CY2012Q1	us-gaap	Service Management Costs ServiceManagementCosts	1307000	USD
CY2011Q1	us-gaap	Service Management Costs ServiceManagementCosts	948000	USD
CY2012Q1	us-gaap	Share Based Compensation ShareBasedCompensation	8968000	USD
CY2011Q1	us-gaap	Share Based Compensation ShareBasedCompensation	6524000	USD
CY2012Q1	us-gaap	Stock Issued During Period Shares Conversion Of Units StockIssuedDuringPeriodSharesConversionOfUnits	31361	shares
CY2012Q1	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	85837	shares
CY2012Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2078310	shares
CY2012Q1	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	690340	shares
CY2012Q1	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	123601393	USD
CY2012Q1	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount	464600000	USD
CY2012Q1	us-gaap	Stockholders Equity StockholdersEquity	5822008000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	5669015000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	5862857000	USD
CY2012Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6018954000	USD
CY2012Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1000	USD
CY2011Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	0	USD
CY2011	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	197600000	USD
CY2012Q1	us-gaap	Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss	190800000	USD
CY2012Q1	us-gaap	Weighted Average Limited Partnership And General Partnership Units Outstanding Basic WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic	312011000	shares
CY2011Q1	us-gaap	Weighted Average Limited Partnership And General Partnership Units Outstanding Basic WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic	306248000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	292895000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	315230000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	292895000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	298805000	shares
CY2012Q1	eqr	Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable	77055000	USD
CY2011Q4	eqr	Accounts Payable And Accrued Liabilities Current And Noncurrent Other Than Interest And Dividend Payable AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrentOtherThanInterestAndDividendPayable	35206000	USD
CY2012Q1	eqr	Additional Common Shares Authorized AdditionalCommonSharesAuthorized	7094004	shares
CY2012Q1	eqr	Adjustment Depreciation AdjustmentDepreciation	175108000	USD
CY2011Q1	eqr	Adjustment Depreciation AdjustmentDepreciation	169363000	USD
CY2012Q1	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	450000	USD
CY2011Q1	eqr	Allocation Of Net Income Loss To Noncontrolling Interests Partially Owned Properties AllocationOfNetIncomeLossToNoncontrollingInterestsPartiallyOwnedProperties	-40000	USD
CY2011Q1	eqr	Amortization Of Deferred Financing Costs AmortizationOfDeferredFinancingCosts	3074000	USD
CY2012Q1	eqr	Amortization Of Deferred Financing Costs AmortizationOfDeferredFinancingCosts	2974000	USD
CY2011Q1	eqr	Amortization Of Deferred Settlements On Derivative Instruments Other Liabilities AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities	-134000	USD
CY2012Q1	eqr	Amortization Of Deferred Settlements On Derivative Instruments Other Liabilities AmortizationOfDeferredSettlementsOnDerivativeInstrumentsOtherLiabilities	-134000	USD
CY2012Q1	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	-2153000	USD
CY2011Q1	eqr	Amortization Of Discounts And Premiums On Debt Mortgage Notes Payable AmortizationOfDiscountsAndPremiumsOnDebtMortgageNotesPayable	-1858000	USD
CY2012Q1	eqr	Amortization Of Discounts And Premiums On Debt Notes Net AmortizationOfDiscountsAndPremiumsOnDebtNotesNet	586000	USD
CY2011Q1	eqr	Amortization Of Discounts And Premiums On Debt Notes Net AmortizationOfDiscountsAndPremiumsOnDebtNotesNet	2231000	USD
CY2012Q1	eqr	Annual Dividend Per Depositary Share AnnualDividendPerDepositaryShare	1.62
CY2012Q1	eqr	Average Price Per Common Share Issued AveragePricePerCommonShareIssued	59.47
CY2012Q2	eqr	Breakupfee Breakupfee	80000000	USD
CY2012Q1	eqr	Bridge Loan Principal Amount BridgeLoanPrincipalAmount	1000000000	USD
CY2012Q1	eqr	Change In Mortgage Deposits ChangeInMortgageDeposits	736000	USD
CY2011Q1	eqr	Change In Mortgage Deposits ChangeInMortgageDeposits	-506000	USD
CY2012Q1	eqr	Common Shares Added To Atm Program CommonSharesAddedToAtmProgram	5700000	shares
CY2012Q1	eqr	Common Shares And Units Outstanding CommonSharesAndUnitsOutstanding	314053586	shares
CY2012Q1	eqr	Common Stock Capital Shares Reserved For Future Issuance Under Share Offering Program CommonStockCapitalSharesReservedForFutureIssuanceUnderShareOfferingProgram	17000000	shares
CY2012Q1	eqr	Consolidated Project Under Development Commitment Fund ConsolidatedProjectUnderDevelopmentCommitmentFund	325800000	USD
CY2011Q4	eqr	Contracted Acquisition Percent ContractedAcquisitionPercent	0.265
CY2011Q4	eqr	Contracted Aquisition Price ContractedAquisitionPrice	1325000000	USD
CY2012Q1	eqr	Dilutive Op Units DilutiveOpUnits	13206000	shares
CY2012Q1	eqr	Dilutive Securities Options DilutiveSecuritiesOptions	3219000	shares
CY2011Q1	eqr	Dilutive Securities Options DilutiveSecuritiesOptions		shares
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfDeferredFinancingCosts	0	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Amortization Of Deferred Financing Costs DisposalGroupIncludingDiscontinuedOperationAmortizationOfDeferredFinancingCosts	-69000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Depreciation DisposalGroupIncludingDiscontinuedOperationDepreciation	371000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Depreciation DisposalGroupIncludingDiscontinuedOperationDepreciation	10908000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation General And Administrative DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrative	11000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation General And Administrative DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrative	4000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Interest And Other Income DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome	25000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Interest And Other Income DisposalGroupIncludingDiscontinuedOperationInterestAndOtherIncome	5000	USD
CY2011Q4	eqr	Disposal Group Including Discontinued Operation Mortgage Notes Payable DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable	0	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Other Expenses DisposalGroupIncludingDiscontinuedOperationOtherExpenses	0	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Other Expenses DisposalGroupIncludingDiscontinuedOperationOtherExpenses	4000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Property And Maintenance DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance	26019000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Property And Maintenance DisposalGroupIncludingDiscontinuedOperationPropertyAndMaintenance	422000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance	250000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Real Estate Taxes And Insurance DisposalGroupIncludingDiscontinuedOperationRealEstateTaxesAndInsurance	4362000	USD
CY2012Q1	eqr	Disposal Group Including Discontinued Operation Rental Revenue DisposalGroupIncludingDiscontinuedOperationRentalRevenue	2931000	USD
CY2011Q1	eqr	Disposal Group Including Discontinued Operation Rental Revenue DisposalGroupIncludingDiscontinuedOperationRentalRevenue	60157000	USD
CY2012Q1	eqr	Disposed Properties DisposedProperties	3
CY2012Q1	eqr	Disposed Units DisposedUnits	1522
CY2011Q1	eqr	Distributions Minority Interests Partially Owned Properties DistributionsMinorityInterestsPartiallyOwnedProperties	264000	USD
CY2012Q1	eqr	Distributions Minority Interests Partially Owned Properties DistributionsMinorityInterestsPartiallyOwnedProperties	1762000	USD
CY2011Q1	eqr	Dividend Preference Units DividendPreferenceUnits	3466000	USD
CY2012Q1	eqr	Dividend Preference Units DividendPreferenceUnits	3466000	USD
CY2011Q4	eqr	Earnest Money On Acquisitions EarnestMoneyOnAcquisitions	7882000	USD
CY2012Q1	eqr	Earnest Money On Acquisitions EarnestMoneyOnAcquisitions	10175000	USD
CY2012Q1	eqr	Equity Method Investment Remaining Funding Obligation EquityMethodInvestmentRemainingFundingObligation	3000000	USD
CY2011Q4	eqr	Escrow Deposits For Mortgage And Replacement Reserves EscrowDepositsForMortgageAndReplacementReserves	10692000	USD
CY2012Q1	eqr	Escrow Deposits For Mortgage And Replacement Reserves EscrowDepositsForMortgageAndReplacementReserves	11428000	USD
CY2012Q1	eqr	Estimates Of Lost Revenue And Garage Reconstruction EstimatesOfLostRevenueAndGarageReconstruction	22800000	USD
CY2011Q4	eqr	Fair Value Of Serp Investments FairValueOfSerpInvestments	71426000	USD
CY2012Q1	eqr	Fair Value Of Serp Investments FairValueOfSerpInvestments	55572000	USD
CY2012Q1	eqr	Income From Continuing Operations Available To Common Shares IncomeFromContinuingOperationsAvailableToCommonShares	13473000	USD
CY2012Q1	eqr	Income Loss From Continuing Operations Available To Units IncomeLossFromContinuingOperationsAvailableToUnits	13473000	USD
CY2011Q1	eqr	Income Loss From Continuing Operations Available To Units IncomeLossFromContinuingOperationsAvailableToUnits	-12339000	USD
CY2012Q1	eqr	Income Loss From Discontinued Operations IncomeLossFromDiscontinuedOperations	1822000	USD
CY2011Q1	eqr	Income Loss From Discontinued Operations IncomeLossFromDiscontinuedOperations	18225000	USD
CY2012Q1	eqr	Initial Insurance Proceeds InitialInsuranceProceeds	3467109	USD
CY2012Q1	eqr	Insurance Reimbursements InsuranceReimbursements	13600000	USD
CY2012Q1	eqr	Interest Capitalized For Real Estate Under Development InterestCapitalizedForRealEstateUnderDevelopment	-4827000	USD
CY2011Q1	eqr	Interest Capitalized For Real Estate Under Development InterestCapitalizedForRealEstateUnderDevelopment	-1659000	USD
CY2012Q1	eqr	Interest Capitalized For Unconsolidated Entities Under Development InterestCapitalizedForUnconsolidatedEntitiesUnderDevelopment	-169000	USD
CY2011Q1	eqr	Interest Capitalized For Unconsolidated Entities Under Development InterestCapitalizedForUnconsolidatedEntitiesUnderDevelopment	-41000	USD
	eqr	Potential Business Combination Costs PotentialBusinessCombinationCosts	5500000	USD
CY2012Q1	eqr	Investment In Joint Venture InvestmentInJointVenture	186300000	USD
CY2012Q2	eqr	Issuance Of Units Subsequent IssuanceOfUnitsSubsequent	1081797	shares
CY2012Q1	eqr	Joint Venture Partner Ownership Percentage JointVenturePartnerOwnershipPercentage	0.80
CY2012Q1	eqr	Land Parcels Contracted To Be Acquired LandParcelsContractedToBeAcquired	4
CY2012Q1	eqr	Land Purchase Price LandPurchasePrice	76100000	USD
CY2012Q1	eqr	Limited Partners Change In Carrying Value LimitedPartnersChangeInCarryingValue	3217000	USD
CY2012Q1	eqr	Limited Partners Change In Redemption Value LimitedPartnersChangeInRedemptionValue	37603000	USD
CY2012Q1	eqr	Military Housing Properties MilitaryHousingProperties	2
CY2012Q1	eqr	Military Housing Units MilitaryHousingUnits	4914
CY2012Q1	eqr	Minority Interest Change In Carrying Value MinorityInterestChangeInCarryingValue	3217000	USD
CY2012Q2	eqr	Mortgage Debt In Conjunction With Acquisition Of Property MortgageDebtInConjunctionWithAcquisitionOfProperty	90000000	USD
CY2012Q1	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	47800000	USD
CY2011Q1	eqr	Mortgage Notes Payable Lump Sum Pay Offs MortgageNotesPayableLumpSumPayOffs	200733000	USD
CY2011Q1	eqr	Net Income Loss Available To Common Stockholder Basic NetIncomeLossAvailableToCommonStockholderBasic	123865000	USD
CY2012Q1	eqr	Net Income Loss Available To Common Stockholder Basic NetIncomeLossAvailableToCommonStockholderBasic	141833000	USD
CY2012Q1	eqr	Net Income Loss Available To Op Unitholders Basic Diluted Numerator NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator	148251000	USD
CY2011Q1	eqr	Net Income Loss Available To Op Unitholders Basic Diluted Numerator NetIncomeLossAvailableToOpUnitholdersBasicDilutedNumerator	129640000	USD
CY2012Q1	eqr	Noncontrolling Interest Balance Limited Life Partnerships NoncontrollingInterestBalanceLimitedLifePartnerships	4700000	USD
CY2012Q1	eqr	Noncontrolling Interests Partially Owned Properties NoncontrollingInterestsPartiallyOwnedProperties	73915000	USD
CY2011Q4	eqr	Noncontrolling Interests Partially Owned Properties NoncontrollingInterestsPartiallyOwnedProperties	74306000	USD
CY2012Q1	eqr	Noncontrolling Interests Settlement Value NoncontrollingInterestsSettlementValue	36100000	USD
CY2012Q2	eqr	Number Of Apartment Properties Acquired Subsequent NumberOfApartmentPropertiesAcquiredSubsequent	1
CY2012Q2	eqr	Number Of Apartment Units Acquired Subsequent NumberOfApartmentUnitsAcquiredSubsequent	511
CY2012Q1	eqr	Number Of Apartments Units Under Development Unconsolidated Projects NumberOfApartmentsUnitsUnderDevelopmentUnconsolidatedProjects	945
CY2012Q2	eqr	Number Of Consolidated Apartment Units Sold NumberOfConsolidatedApartmentUnitsSold	351
CY2012Q1	eqr	Number Of Joint Venture Loans NumberOfJointVentureLoans	2
CY2012Q1	eqr	Number Of Joint Ventures NumberOfJointVentures	2
CY2012Q1	eqr	Number Of Projects In Various Stages Of Development NumberOfProjectsInVariousStagesOfDevelopment	6
CY2012Q1	eqr	Number Of Unconsolidated Projects NumberOfUnconsolidatedProjects	2
CY2012Q1	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	105612
CY2011Q1	eqr	Number Of Units In Same Store Properties NumberOfUnitsInSameStoreProperties	105612
CY2012Q1	eqr	Number Of Units In Various Stages Of Development NumberOfUnitsInVariousStagesOfDevelopment	1535
CY2012Q1	eqr	Other Restricted Cash OtherRestrictedCash	4086000	USD
CY2011Q4	eqr	Other Restricted Cash OtherRestrictedCash	3944000	USD
CY2011Q1	eqr	Overhead Costs OverheadCosts	100000	USD
CY2012Q1	eqr	Partially Owned Consolidated Properties PartiallyOwnedConsolidatedProperties	21
CY2012Q1	eqr	Partially Owned Consolidated Units PartiallyOwnedConsolidatedUnits	3916
CY2012Q1	eqr	Partially Owned Limited Life Partnership Properties PartiallyOwnedLimitedLifePartnershipProperties	6
CY2012Q1	eqr	Partners Payments To Acquire Equity Method Investments PartnersPaymentsToAcquireEquityMethodInvestments	40100000	USD
CY2011Q1	eqr	Payments To Acquire Other Capital Assets PaymentsToAcquireOtherCapitalAssets	2677000	USD
CY2012Q1	eqr	Payments To Acquire Other Capital Assets PaymentsToAcquireOtherCapitalAssets	2229000	USD
CY2012Q1	eqr	Proceeds From Employee Stock Purchase Plan ProceedsFromEmployeeStockPurchasePlan	4210000	USD
CY2011Q1	eqr	Proceeds From Employee Stock Purchase Plan ProceedsFromEmployeeStockPurchasePlan	2742000	USD
CY2012Q1	eqr	Segment Reporting Segment Operating Expenses SegmentReportingSegmentOperatingExpenses	191775000	USD
CY2011Q1	eqr	Segment Reporting Segment Operating Expenses SegmentReportingSegmentOperatingExpenses	179567000	USD
CY2012Q1	eqr	Segment Reporting Segment Same Store Operating Expenses SegmentReportingSegmentSameStoreOperatingExpenses	173054000	USD
CY2011Q1	eqr	Segment Reporting Segment Same Store Operating Expenses SegmentReportingSegmentSameStoreOperatingExpenses	170017000	USD
CY2012Q1	eqr	Segment Reporting Segment Same Store Rental Income SegmentReportingSegmentSameStoreRentalIncome	473957000	USD
CY2011Q1	eqr	Segment Reporting Segment Same Store Rental Income SegmentReportingSegmentSameStoreRentalIncome	449232000	USD
CY2012Q1	eqr	Settlement Expense SettlementExpense	4200000	USD
CY2012Q1	eqr	Proceeds From Sale Of Property ProceedsFromSaleOfProperty	206350000	USD
CY2012Q1	eqr	Project Cost ProjectCost	232800000	USD
CY2012Q1	eqr	Properties Acquired PropertiesAcquired	3
CY2012Q1	eqr	Properties Contracted To Be Acquired PropertiesContractedToBeAcquired	0
CY2012Q1	eqr	Properties Contracted To Be Disposed PropertiesContractedToBeDisposed	3
CY2012Q1	eqr	Properties Designed And Built In Violation Of Accessibility Requirements PropertiesDesignedAndBuiltInViolationOfAccessibilityRequirements	300
CY2012Q2	eqr	Properties Sold Subsequent PropertiesSoldSubsequent	4	USD
CY2012Q1	eqr	Property Units Acquired PropertyUnitsAcquired	544
CY2012Q1	eqr	Purchase Price For Commitments To Acquire PurchasePriceForCommitmentsToAcquire	73500000	USD
CY2012Q1	eqr	Receivable For Common Shares Issued ReceivableForCommonSharesIssued	28457000	USD
CY2011Q1	eqr	Receivable For Common Shares Issued ReceivableForCommonSharesIssued	0	USD
CY2011Q4	eqr	Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure	416404000	USD
CY2012Q1	eqr	Redeemable Noncontrolling Interest Operating Partnership Fair Value Disclosure RedeemableNoncontrollingInterestOperatingPartnershipFairValueDisclosure	457224000	USD
CY2011Q4	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	416404000	USD
CY2012Q1	eqr	Redeemable Noncontrolling Interests Operating Partnership RedeemableNoncontrollingInterestsOperatingPartnership	457224000	USD
CY2012Q1	eqr	Redemption Value Limited Partners RedemptionValueLimitedPartners	457224000	USD
CY2011Q4	eqr	Redemption Value Limited Partners RedemptionValueLimitedPartners	416404000	USD
CY2012Q2	eqr	Remaining Acquisition Cost Contracted RemainingAcquisitionCostContracted	1500000000	USD
CY2012Q2	eqr	Remaining Ownership Percentage Contracted RemainingOwnershipPercentageContracted	0.265
CY2012Q1	eqr	Repayments Of Mortgage Notes Payable RepaymentsOfMortgageNotesPayable	3970000	USD
CY2011Q1	eqr	Repayments Of Mortgage Notes Payable RepaymentsOfMortgageNotesPayable	4223000	USD
CY2011Q4	eqr	Resident Security And Utility Deposits ResidentSecurityAndUtilityDeposits	40403000	USD
CY2012Q1	eqr	Resident Security And Utility Deposits ResidentSecurityAndUtilityDeposits	43029000	USD
CY2011Q4	eqr	Restricted Deposits On Debt RestrictedDepositsOnDebt	2370000	USD
CY2012Q1	eqr	Restricted Deposits On Debt RestrictedDepositsOnDebt	2161000	USD
CY2011Q4	eqr	Restricted Deposits On Real Estate Investments RestrictedDepositsOnRealEstateInvestments	43970000	USD
CY2012Q1	eqr	Restricted Deposits On Real Estate Investments RestrictedDepositsOnRealEstateInvestments	43586000	USD
CY2012Q1	eqr	Restricted Share Grants Net RestrictedShareGrantsNet	128136	shares
CY2012Q1	eqr	Sales Price For Commitments To Dispose SalesPriceForCommitmentsToDispose	54100000	USD
CY2012Q1	eqr	Secured Debt Instrument Fair Value SecuredDebtInstrumentFairValue	4300000000	USD
CY2011Q4	eqr	Secured Debt Instrument Fair Value SecuredDebtInstrumentFairValue	4300000000	USD
CY2012Q1	eqr	Segment Reporting Information Net Operating Income SegmentReportingInformationNetOperatingIncome	333820000	USD
CY2011Q1	eqr	Segment Reporting Information Net Operating Income SegmentReportingInformationNetOperatingIncome	284983000	USD
CY2012Q1	eqr	Segment Reporting Information Non Same Store Net Operating Income SegmentReportingInformationNonSameStoreNetOperatingIncome	32917000	USD
CY2011Q1	eqr	Segment Reporting Information Non Same Store Net Operating Income SegmentReportingInformationNonSameStoreNetOperatingIncome	5768000	USD
CY2012Q1	eqr	Segment Reporting Information Same Store Net Operating Income SegmentReportingInformationSameStoreNetOperatingIncome	300903000	USD
CY2011Q1	eqr	Segment Reporting Information Same Store Net Operating Income SegmentReportingInformationSameStoreNetOperatingIncome	279215000	USD
CY2012Q1	eqr	Segment Reporting Segment Non Same Store Operating Expenses SegmentReportingSegmentNonSameStoreOperatingExpenses	18721000	USD
CY2011Q1	eqr	Segment Reporting Segment Non Same Store Operating Expenses SegmentReportingSegmentNonSameStoreOperatingExpenses	9550000	USD
CY2012Q1	eqr	Segment Reporting Segment Non Same Store Rental Income SegmentReportingSegmentNonSameStoreRentalIncome	51638000	USD
CY2011Q1	eqr	Segment Reporting Segment Non Same Store Rental Income SegmentReportingSegmentNonSameStoreRentalIncome	15318000	USD
CY2012Q1	eqr	Stock Issued During Period Shares StockIssuedDuringPeriodShares	2078310	shares
CY2012Q1	eqr	Stock Repurchased And Retired StockRepurchasedAndRetired	0	shares
CY2012Q2	eqr	Subsequent Event Repayment Of Mortgage Loans SubsequentEventRepaymentOfMortgageLoans	30800000	USD
CY2012Q2	eqr	Subsequent Event Sold Consolidated Property SubsequentEventSoldConsolidatedProperty	15550000	USD
CY2012Q1	eqr	Tax Deferred Exchange Proceeds TaxDeferredExchangeProceeds	79145000	USD
CY2011Q4	eqr	Tax Deferred Exchange Proceeds TaxDeferredExchangeProceeds	53668000	USD
CY2012Q1	eqr	Term Loan Facility Spread TermLoanFacilitySpread	0.0125
CY2012Q1	eqr	Term Loan Principal Amount TermLoanPrincipalAmount	500000000	USD
CY2011Q1	eqr	Total Operating Expenses TotalOperatingExpenses	-179567000	USD
CY2012Q1	eqr	Total Operating Expenses TotalOperatingExpenses	-191775000	USD
CY2012Q1	eqr	Unconsolidated Project Under Development Commitment Fund UnconsolidatedProjectUnderDevelopmentCommitmentFund	3000000	USD
CY2012Q1	eqr	Units Contracted To Be Acquired UnitsContractedToBeAcquired	0
CY2012Q1	eqr	Units Contracted To Be Disposed UnitsContractedToBeDisposed	699
CY2012Q1	eqr	Units Issued During Period New Issues UnitsIssuedDuringPeriodNewIssues	2078310	shares
CY2012Q1	eqr	Units Ownership Interest In Operating Partnership UnitsOwnershipInterestInOperatingPartnership	0.043
CY2012Q1	eqr	Unrealized Gain Loss On Derivative Instruments Mortgage Notes Payable UnrealizedGainLossOnDerivativeInstrumentsMortgageNotesPayable	-588000	USD
CY2011Q1	eqr	Unrealized Gain Loss On Derivative Instruments Mortgage Notes Payable UnrealizedGainLossOnDerivativeInstrumentsMortgageNotesPayable	-144000	USD
CY2011Q1	eqr	Unrealized Gain Loss On Derivative Instruments Notes Net UnrealizedGainLossOnDerivativeInstrumentsNotesNet	-1348000	USD
CY2012Q1	eqr	Unrealized Gain Loss On Derivative Instruments Notes Net UnrealizedGainLossOnDerivativeInstrumentsNotesNet	-712000	USD
CY2011Q1	eqr	Unrealized Gain Loss On Derivative Instruments Other Assets UnrealizedGainLossOnDerivativeInstrumentsOtherAssets	810000	USD
CY2012Q1	eqr	Unrealized Gain Loss On Derivative Instruments Other Assets UnrealizedGainLossOnDerivativeInstrumentsOtherAssets	1300000	USD
CY2011Q1	eqr	Unrealized Gain Loss On Derivative Instruments Other Liabilities UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities	-5400000	USD
CY2012Q1	eqr	Unrealized Gain Loss On Derivative Instruments Other Liabilities UnrealizedGainLossOnDerivativeInstrumentsOtherLiabilities	-3219000	USD
CY2012Q1	eqr	Unsecured Debt Instrument Fair Value UnsecuredDebtInstrumentFairValue	6000000000	USD
CY2011Q4	eqr	Unsecured Debt Instrument Fair Value UnsecuredDebtInstrumentFairValue	6000000000	USD
CY2012Q2	eqr	Value Of Properties Acquired Subsequent ValueOfPropertiesAcquiredSubsequent	230900000	USD
CY2012Q1	eqr	Variable Interest Entity Joint Venture Partner Ownership Percentage VariableInterestEntityJointVenturePartnerOwnershipPercentage	0.50
CY2012Q1	eqr	Various Period Of Outstanding Mortgage Indebtedness VariousPeriodOfOutstandingMortgageIndebtedness	September 1, 2048
CY2012Q1	eqr	Various Stages Of Development Date Maturity VariousStagesOfDevelopmentDateMaturity	2014-03-31
CY2012Q1	eqr	Various Stages Of Development Date Maturity Unconsolidated VariousStagesOfDevelopmentDateMaturityUnconsolidated	2013-12-31
CY2012Q1	eqr	Weighted Average Interest Rate WeightedAverageInterestRate	0.0514
CY2012Q1	eqr	Weighted Average Mortgage Debt Interest Rate WeightedAverageMortgageDebtInterestRate	0.0488
CY2011Q1	eqr	Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted	306248000	shares
CY2012Q1	eqr	Weighted Average Number Of Limited Partnership And General Partnership Unit Outstanding Diluted WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingDiluted	315230000	shares
CY2012Q1	eqr	Wholly Owned Properties WhollyOwnedProperties	404
CY2012Q1	eqr	Wholly Owned Units WhollyOwnedUnits	112181
CY2012Q1	dei	Amendment Flag AmendmentFlag	false
CY2012Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2012Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012Q1	dei	Document Period End Date DocumentPeriodEndDate	2012-03-31
CY2012Q1	dei	Document Type DocumentType	10-Q
CY2012Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000906107
CY2012Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	300624108	shares
CY2012Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q1	dei	Entity Registrant Name EntityRegistrantName	EQUITY RESIDENTIAL
CY2012Q1	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012Q1	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0000906107-12-000012-index-headers.html	Edgar Link	pending
0000906107-12-000012-index.html	Edgar Link	pending
0000906107-12-000012.txt	Edgar Link	pending
0000906107-12-000012-xbrl.zip	Edgar Link	pending
eqr-20120331.xml	Edgar Link	completed
eqr-20120331.xsd	Edgar Link	pending
eqr-20120331_cal.xml	Edgar Link	unprocessable
eqr-20120331_def.xml	Edgar Link	unprocessable
eqr-20120331_lab.xml	Edgar Link	unprocessable
eqr-20120331_pre.xml	Edgar Link	unprocessable
eqr-2012331xexhibit311.htm	Edgar Link	pending
eqr-2012331xexhibit312.htm	Edgar Link	pending
eqr-2012331xexhibit321.htm	Edgar Link	pending
eqr-2012331xexhibit322.htm	Edgar Link	pending
erpop-2012331xexhibit313.htm	Edgar Link	pending
erpop-2012331xexhibit314.htm	Edgar Link	pending
erpop-2012331xexhibit323.htm	Edgar Link	pending
erpop-2012331xexhibit324.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
q11210-q.htm	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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R8.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
reitstructuregraphic1.gif	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$EQR
EQUITY RESIDENTIAL Stock $eqr

2012 Q1 Form 10-Q Financial Statement

#000090610712000012 Filed on May 03, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EQR EQUITY RESIDENTIAL Stock $eqr

2012 Q1 Form 10-Q Financial Statement

#000090610712000012 Filed on May 03, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EQR
EQUITY RESIDENTIAL Stock $eqr