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Summary of Significant Accounting Policies (Details) (USD $)
In Billions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Revenue Recognition [Abstract]    
Term of residency agreements- minimum 30 days  
Term of residency agreements - maximum 1 year  
Carrying Value, Fair Value Disclosure [Member]    
Fair value of financial instruments [Abstract]    
Debt 3.6us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 3.5us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Capital and financing obligations 2.6bkd_CapitalAndFinancingLeaseObligationFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 2.6bkd_CapitalAndFinancingLeaseObligationFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair value of financial instruments [Abstract]    
Debt 3.6us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 3.5us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Capital and financing obligations 2.6bkd_CapitalAndFinancingLeaseObligationFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 2.6bkd_CapitalAndFinancingLeaseObligationFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember