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Property, Plant and Equipment and Leasehold Intangibles, Net - Future Amortization Expense (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Property, Plant and Equipment [Abstract] |
2018 | $ 5,938
2019 | 5,197
2020 | 4,144
2021 | 2,748
2022 | 1,758
Thereafter | 8,200
Total | $ 27,985

X
- Definition The aggregate estimated amortization expense for succeeding fiscal years for resident and leasehold operating intangible assets subject to amortization. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpense
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized for the remainder of the finite-lived intangible asset useful life after the fifth succeeding fiscal year. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseAfterYearFive
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFive
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFour
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearOne
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearThree
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years. + References No definition available. + Details
Name: | bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearTwo
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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