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Commitments and Contingencies - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 lease
Commitments and Contingencies Disclosure [Abstract] |
Number of communities operated under long-term leases | 434
Number of operating leases | 290
Number of capital and financing leases | 144
Initial lease terms, minimum | 10 years
Initial lease terms, maximum | 20 years
Renewal options, minimum | 5 years
Renewal options, maximum | 15 years
Remaining base lease terms, minimum | 1 year
Remaining base lease terms, maximum | 15 years

X
- Definition The maximum number of years of lease agreements. + References No definition available. + Details
Name: | bkd_InitialLeaseTermsMaximum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum number of years of lease agreements. + References No definition available. + Details
Name: | bkd_InitialLeaseTermsMinimum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of capital and financing leases. + References No definition available. + Details
Name: | bkd_NumberOfCapitalAndFinancingLeases
Namespace Prefix: | bkd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of communities operated under long-term leases. + References No definition available. + Details
Name: | bkd_NumberOfCommunitiesOperatedUnderLongTermLeases
Namespace Prefix: | bkd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represent number of operating leases. + References No definition available. + Details
Name: | bkd_NumberOfOperatingLeases
Namespace Prefix: | bkd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum remaining base term for lease agreement. + References No definition available. + Details
Name: | bkd_RemainingBaseLeaseTermsMaximum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum remaining base term for lease agreement. + References No definition available. + Details
Name: | bkd_Remainingbaseleasetermsminimum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum number of years for renewal options. + References No definition available. + Details
Name: | bkd_RenewalOptionsMaximum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum number of years for renewal options. + References No definition available. + Details
Name: | bkd_RenewalOptionsMinimum
Namespace Prefix: | bkd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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