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Self-Insurance (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Self-Insurance [Abstract] |  |
Loss Contingency, Receivable, Total | $ 22.8 | $ 41.5
Self insurance reserve | 184.0 | 248.4
Self insurance reserve, non-current | 112.9 | 153.5
Secured self-insured retention risk under workers' compensation program with cash | 12.4 | 15.6
Letters of credit associated to the secured self-insured retention risk | 59.5 | $ 49.8
Cash deposit to collateralize the insurance policy | 37.4 |
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve | $ 35.4 |

X
- Definition This element represent noncurrent self-insured portion of expected losses plus incurred but not reported claims as of the balance sheet date. + References No definition available. + Details
Name: | bkd_AccruedSelfInsuredPortionsOfProgramsNoncurrent
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of cash and letters of credit associated to the secured self-insured retention risk. + References No definition available. + Details
Name: | bkd_CashAndLettersOfCreditForSelfInsuredRetentionRisk
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash deposit to collateralize the insurance policy + References No definition available. + Details
Name: | bkd_CashDepositToCollateralizeTheInsurancePolicy
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represent self-insured portion of expected losses plus incurred but not reported claims due as of the balance sheet date. + References No definition available. + Details
Name: | bkd_SelfInsuredPortionsOfProgramsAccruedCurrentAndNoncurrent
Namespace Prefix: | bkd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248 + Details
Name: | us-gaap_LossContingencyReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_SelfInsuranceReserveNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant