Debt Instrument, Number Of Communities Securing Debt

No definition available.

Name:	bkd_DebtInstrumentNumberOfCommunitiesSecuringDebt
Namespace Prefix:	bkd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of the company's communities securing the Long-term debt instrument.

+ References

No definition available.

+ Details

Name:	bkd_NumberOfCommunitiesSecuringMortgageNotes
Namespace Prefix:	bkd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Debt Instruments Refinanced

+ References

No definition available.

+ Details

Name:	bkd_NumberOfDebtInstrumentsRefinanced
Namespace Prefix:	bkd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds From Debt Refinancing

+ References

No definition available.

+ Details

Name:	bkd_ProceedsFromDebtRefinancing
Namespace Prefix:	bkd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfDebtRestructuringCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_NonRecourseFirstMortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_NonRecourseSupplementalLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_MortgageDebtDueApril2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_MortgageDebtDueJanuary2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_MortgageDebtDueAugust2018Member
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_MortgageDebtDueMay2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bkd_ConvertibleSeniorNotesDueJune2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	bkd_DebtInstrumentTermOfAgreementAxis=bkd_OneHalfPrincipalMaturingin2024Member
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- Details

Name:	bkd_DebtInstrumentTermOfAgreementAxis=bkd_OneHalfPrincipalMaturingin2027Member
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Debt - 2017 Financings (Details) $ in Millions		1 Months Ended			3 Months Ended	12 Months Ended
Debt - 2017 Financings (Details) $ in Millions	Jun. 15, 2018 USD ($)	Apr. 30, 2018 USD ($) community	Aug. 31, 2017 USD ($) community	Jul. 31, 2017 USD ($) community loan_portfolio	Dec. 31, 2018 USD ($) community	Dec. 31, 2018 USD ($) community	Dec. 31, 2017 USD ($) community	Jun. 30, 2017 USD ($) community	Jun. 30, 2011 USD ($)
Debt Instrument [Line Items]
Payments of debt restructuring						$ 11.7	$ 12.4
Non-Recourse First Mortgages
Debt Instrument [Line Items]
Extinguishment of debt					$ 307.4		$ 78.9
Number of communities securing mortgage notes \| community							13
First Mortgage Financing
Debt Instrument [Line Items]
Interest rate		4.55%		4.81%	5.08%	5.08%
Debt maturity period				10 years
Percentage bearing fixed interest		60.00%	60.00%	70.00%	65.00%	65.00%
Percentage bearing variable interest		40.00%	40.00%	30.00%	35.00%	35.00%
First Mortgage Financing \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate basis		1.89%	2.415%	2.44%	2.16%
First Mortgage Financing \| Non-Recourse Supplemental Loan
Debt Instrument [Line Items]
Principal amount		$ 247.6			$ 327.0	$ 327.0		$ 54.7
Number of communities securing debt \| community								7
Interest rate								4.69%
First Mortgage Financing \| Mortgage Debt Due April 2018
Debt Instrument [Line Items]
Extinguishment of debt				$ 188.1
First Mortgage Financing \| Mortgage Debt Due January 2021
Debt Instrument [Line Items]
Extinguishment of debt				$ 13.6
First Mortgage Financing \| Mortgage Debt Due August 2018
Debt Instrument [Line Items]
Extinguishment of debt			$ 389.9
First Mortgage Financing \| Mortgage Debt Due May 2023
Debt Instrument [Line Items]
Extinguishment of debt			$ 228.9
Secured Debt \| Non-Recourse First Mortgages
Debt Instrument [Line Items]
Number of communities securing debt \| community		11	51	22	28	28
Number of debt instruments refinanced \| loan_portfolio				2
Proceeds from debt refinancing			$ 975.0	$ 221.3
Convertible notes payable
Debt Instrument [Line Items]
Principal amount							$ 316.3
Convertible notes payable \| Convertible Senior Notes Due June 2018
Debt Instrument [Line Items]
Principal amount									$ 316.3
Interest rate									2.75%
Extinguishment of debt	$ 316.3
One Half Principal, Maturing in 2024 \| First Mortgage Financing
Debt Instrument [Line Items]
Interest rate			4.43%
One Half Principal, Maturing in 2027 \| First Mortgage Financing
Debt Instrument [Line Items]
Interest rate			4.47%