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Subsequent Events (Details) (Acquisition of Venture Interest [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Community
Acquisition of Venture Interest [Member]
 
Subsequent Event [Line Items]  
Number of facilities purchased or sold 35bkd_NumberOfFacilitiesPurchasedOrSold
/ us-gaap_SubsequentEventTypeAxis
= bkd_AcquisitionOfVentureInterestMember
Aggregate purchase price $ 849.0us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates
/ us-gaap_SubsequentEventTypeAxis
= bkd_AcquisitionOfVentureInterestMember
Partners Joint Venture Ownership Percentage 10.00%bkd_PartnersJointVentureOwnershipPercentage
/ us-gaap_SubsequentEventTypeAxis
= bkd_AcquisitionOfVentureInterestMember