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Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
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Jan. 29, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 item | Dec. 31, 2012 item | Mar. 31, 2013 item | Oct. 19, 2012 | Oct. 31, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Apr. 23, 2012
Equity |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.565 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.18 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.1 us-gaap_CommonStockDividendsPerShareDeclared | $ 2.00 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |  |  |  |
Issuance of common stock, net |  | $ 92,131,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 107,018,000 us-gaap_StockIssuedDuringPeriodValueNewIssues | $ 1,756,796,000 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of common stock |  | 12,703,000 us-gaap_StockRepurchasedDuringPeriodValue | 10,438,000 us-gaap_StockRepurchasedDuringPeriodValue | 15,632,000 us-gaap_StockRepurchasedDuringPeriodValue |  |  |  |  |  |  |  |
Aggregate redemption amount |  |  |  | 295,500,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
DownREIT unit, carrying value |  | 188,588,000 us-gaap_MinorityInterestInPreferredUnitHolders | 184,105,000 us-gaap_MinorityInterestInPreferredUnitHolders |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses on available for sale securities |  | 13,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |
Unrealized losses on cash flow hedges, net |  | (9,624,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax | (10,797,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax |  |  |  |  |  |  |  |  |
Supplemental Executive Retirement Plan minimum liability |  | (3,537,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax | (2,910,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax |  |  |  |  |  |  |  |  |
Cumulative foreign currency translation adjustment |  | (10,747,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | (780,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  |  |  |  |  |  |
Total accumulated other comprehensive loss |  | (23,895,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (14,487,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  |  |  |  |  |  |
Senior housing | Blackstone JV |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Number of senior housing communities |  |  |  |  | 4 hcp_NumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = hcp_BlackstoneJVMember / us-gaap_StatementBusinessSegmentsAxis = hcp_SeniorHousingMember | 129 hcp_NumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = hcp_BlackstoneJVMember / us-gaap_StatementBusinessSegmentsAxis = hcp_SeniorHousingMember | 133 hcp_NumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = hcp_BlackstoneJVMember / us-gaap_StatementBusinessSegmentsAxis = hcp_SeniorHousingMember |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  | 2,939,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,136,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 42,468,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 979,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 376,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 359,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Issuance of common stock, net (in shares) |  | 2,939,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,136,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 42,468,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 22,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Repayment of senior unsecured notes |  |  |  |  |  |  |  |  |  | 250,000,000 us-gaap_RepaymentsOfSeniorDebt / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Interest rate on repaid maturing debt (as a percent) |  |  |  |  |  |  |  |  |  | 6.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Dividend Reinvestment and Stock Purchase Plan (in shares) |  | 2,299,000 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,441,000 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,064,000 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Conversion of DownREIT units (in shares) |  | 27,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 100,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 736,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 169,000 hcp_StockIssuedDuringPeriodSharesStockOptionsGrossExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 876,000 hcp_StockIssuedDuringPeriodSharesStockOptionsGrossExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,455,000 hcp_StockIssuedDuringPeriodSharesStockOptionsGrossExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Vesting of restricted stock units (in shares) |  | 614,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 471,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 707,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Repurchase of common stock |  | 323,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 242,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 361,000 us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Aggregate redemption amount |  |  |  |  |  |  |  |  |  |  |  | 295,500,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred stock issuance costs write-off |  |  |  |  |  |  |  |  |  |  |  | 10,400,000 hcp_WriteOffOfDeferredStockIssuanceCost / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred Stock | Series E cumulative redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 hcp_PreferredStockRedemptionShares / us-gaap_StatementClassOfStockAxis = hcp_SeriesECumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividend Rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 7.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = hcp_SeriesECumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred stock redemption value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = hcp_SeriesECumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred Stock | Series F cumulative redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed |  |  |  |  |  |  |  |  |  |  |  | 7,820,000 hcp_PreferredStockRedemptionShares / us-gaap_StatementClassOfStockAxis = hcp_SeriesFCumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Dividend Rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 7.10%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = hcp_SeriesFCumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Preferred stock redemption value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = hcp_SeriesFCumulativeRedeemablePreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  | (557,000)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (3,683,000)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (25,029,000)us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |
Company's common stock issuances |  |  |  |  |  |  |  |  |  |  |  |
Conversion of DownREIT units (in shares) |  | 6,000,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |
Non-managing members DownREIT units outstanding |  | 4,000,000 hcp_DownReitUnitsOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
Number of DownREIT LLCs |  | 5 hcp_NumberOfDownREITLLCs / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
DownREIT unit, carrying value |  | 189,000,000 us-gaap_MinorityInterestInPreferredUnitHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |
DownREIT unit, fair value |  | $ 268,000,000 hcp_MinorityInterestInPreferredUnitHoldersFairValue / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |  |  |  |  |  |

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