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Stock-Based Compensation (Details) (Unvested Restricted Stock [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Grants of Restricted Stock [Line Items] |
Restricted Shares Granted (in shares) | 1,335 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Total value of restricted shares granted | $ 46,142 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Minimum [Member] |
Grants of Restricted Stock [Line Items] |
Percentage of estimated forfeitures (in hundredths) | 0.00%bkd_StockBasedCompensationPercentageOfEstimatedForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Value Per Share (in dollars per share) | $ 34.57 bkd_ShareBasedCompensationSharesValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] |
Grants of Restricted Stock [Line Items] |
Percentage of estimated forfeitures (in hundredths) | 15.00%bkd_StockBasedCompensationPercentageOfEstimatedForfeitures / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Value Per Share (in dollars per share) | $ 34.89 bkd_ShareBasedCompensationSharesValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition The grant date fair values for purposes of disclosing shares potentially issuable under restricted stock awards on all restricted stock plans and other required information pertaining to awards in the customized range. + References No definition available. + Details
Name: | bkd_ShareBasedCompensationSharesValuePerShare
Namespace Prefix: | bkd_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The estimated measure of the percentage of shares, units or grants expected to be forfeited. + References No definition available. + Details
Name: | bkd_StockBasedCompensationPercentageOfEstimatedForfeitures
Namespace Prefix: | bkd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
Name: | us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration