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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator
(Loss) income from continuing operations	$ (237,503)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	$ 233,877us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Noncontrolling interests' share in continuing operations	(3,111)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity	(3,335)us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity
(Loss) income from continuing operations applicable to HCP, Inc.	(240,614)us-gaap_IncomeLossFromContinuingOperations	230,542us-gaap_IncomeLossFromContinuingOperations
Participating securities' share in earnings	(335)hcp_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasicAndDiluted	(1,064)hcp_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasicAndDiluted
(Loss) income from continuing operations applicable to common shares	(240,949)hcp_NetIncomeLossContinuingOperationsAvailableToCommonStockholdersBasic	229,478hcp_NetIncomeLossContinuingOperationsAvailableToCommonStockholdersBasic
Discontinued operations		29,746us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Noncontrolling interests' share in discontinued operations		(1,177)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest
Net (loss) income applicable to common shares	$ (240,949)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 258,047us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator
Basic weighted average common shares	460,880,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	457,294,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive potential common shares		380,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average common shares	460,880,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	457,674,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share
(Loss) income from continuing operations (in dollars per share)	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare	$ 0.50us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations (in dollars per share)		$ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net (loss) income applicable to common shares (in dollars per share)	$ (0.52)us-gaap_EarningsPerShareBasic	$ 0.56us-gaap_EarningsPerShareBasic
Diluted earnings per common share
(Loss) income from continuing operations (in dollars per share)	$ (0.52)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare	$ 0.50us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations (in dollars per share)		$ 0.06us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net (loss) income applicable to common shares (in dollars per share)	$ (0.52)us-gaap_EarningsPerShareDiluted	$ 0.56us-gaap_EarningsPerShareDiluted
Common Stock Options
Diluted earnings per common share
Shares of anti-dilutive securities excluded from earnings per share calculation	500,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember	1,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember
Down REIT
Diluted earnings per common share
Shares of anti-dilutive securities excluded from earnings per share calculation	6,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hcp_DownREITMember
DownREIT LLCs, non-managing member units outstanding	4,000,000hcp_DownReitLimitedLiabilityCompanyNonmanagingMemberUnitsOutstanding / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hcp_DownREITMember
Restricted Stock and Performance Restricted Stock Units
Diluted earnings per common share
Shares of anti-dilutive securities excluded from earnings per share calculation	400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hcp_RestrictedStockAndRestrictedStockUnitMember	900,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = hcp_RestrictedStockAndRestrictedStockUnitMember

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- Definition

The number of non-managing member units outstanding for DownREIT limited liability companies for which the entity is the managing member.

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