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Supplemental Disclosure of Cash Flow Information - Notes Receivable (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Supplemental Cash Flow Elements [Abstract] |  |
Other assets, net | $ 6,566 | $ 0
Noncontrolling interest | (6,566) | 0
Net | $ 0 | $ 0

X
- Definition Notes Receivables, Net + References No definition available. + Details
Name: | bkd_NotesReceivablesNet
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Notes Receivables, Noncontrolling Interest + References No definition available. + Details
Name: | bkd_NotesReceivablesNoncontrollingInterest
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Notes Receivables, Other Assets, Net + References No definition available. + Details
Name: | bkd_NotesReceivablesOtherAssetsNet
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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