Property, Plant and Equipment and Leasehold Intangibles, Net - Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2017 USD ($)
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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration