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Supplemental Disclosure of Cash Flow Information - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract] |  |
Net cash paid for termination of operating leases | $ 46,600 |
Net cash paid for capital leases | $ 10,548 | $ 552

X
- Definition Payments (Proceeds) For Lease Termination + References No definition available. + Details
Name: | bkd_PaymentsProceedsForLeaseTermination
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Payments (Proceeds) For Termination Of Operating Leases + References No definition available. + Details
Name: | bkd_PaymentsProceedsForTerminationOfOperatingLeases
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration