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Supplemental Disclosure of Cash Flow Information - Additional Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Supplemental Cash Flow Elements [Abstract] |
Net cash paid for termination of operating leases | $ 46.6
Net cash paid for termination of capital and financing leases | $ 12.5

X
- Definition Payments (Proceeds) For Termination Of Capital And Financing Leases, Financing Activities + References No definition available. + Details
Name: | bkd_PaymentsProceedsForTerminationOfCapitalAndFinancingLeasesFinancingActivities
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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