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Facility Operating Leases (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Schedule of facility operating lease expense [Abstract] |  |  |  |
Cash basis payment | $ 71,340 | $ 69,186 | $ 142,525 | $ 138,550
Straight-line expense | (217) | 684 | (440) | 1,432
Amortization of deferred gain | (1,093) | (1,093) | (2,186) | (2,186)
Facility lease expense | $ 70,030 | $ 68,777 | $ 139,899 | $ 137,796

X
- Definition The amount of expense charged against earnings by an Entity to record deferred gains from sale leaseback transactions. + References No definition available. + Details
Name: | bkd_AmortizationOfDeferredGainsFromSaleLeasebackTransaction
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash payments for obligations under lease agreements. + References No definition available. + Details
Name: | bkd_CashBasisPayment
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase or decrease in deferred lease liability. + References No definition available. + Details
Name: | bkd_ChangeInDeferredLeaseLiability
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_LeasesOperatingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration