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Income Taxes (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Federal [Abstract] |  |  |
Current | $ 1,367,000 us-gaap_CurrentFederalTaxExpenseBenefit | $ (312,000)us-gaap_CurrentFederalTaxExpenseBenefit | $ 193,000 us-gaap_CurrentFederalTaxExpenseBenefit
Deferred | 182,371,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 183,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 347,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total Federal Tax Expense | 183,738,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | (129,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 540,000 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State [Abstract] |  |  |
Current | (2,433,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (1,627,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (2,059,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred (included in Federal above) | 0 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total State Tax Expense | (2,433,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (1,627,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (2,059,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total | 181,305,000 us-gaap_IncomeTaxExpenseBenefit | (1,756,000)us-gaap_IncomeTaxExpenseBenefit | (1,519,000)us-gaap_IncomeTaxExpenseBenefit
U.S. Federal statutory rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Tax benefit at U.S. statutory rate | 115,756,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 640,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 22,945,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Credits | (2,222,000)us-gaap_IncomeTaxReconciliationTaxCredits | 9,757,000 us-gaap_IncomeTaxReconciliationTaxCredits | 0 us-gaap_IncomeTaxReconciliationTaxCredits
Valuation allowance | 64,155,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (7,097,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (24,138,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible transaction costs | (6,870,000)us-gaap_IncomeTaxReconciliationNondeductibleExpense | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Tax rate changes | (718,000)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 0 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | 0 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Return to provision | 716,000 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | (2,568,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | (225,000)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
State taxes, net of federal income tax | 11,582,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (985,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,258,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Officer's compensation | (751,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (724,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (922,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Meals and entertainment | (946,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | (496,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment | (486,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Expired charitable | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions | (126,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseCharitableContributions
Lobbying and Political | (101,000)bkd_IncomeTaxReconciliationLobbyingAndPolitical | (89,000)bkd_IncomeTaxReconciliationLobbyingAndPolitical | 0 bkd_IncomeTaxReconciliationLobbyingAndPolitical
Other, net | (118,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (65,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 122,000 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Unrecognized tax benefits | 822,000 bkd_IncomeTaxReconciliationTaxContingenciesUnrecognizedTaxBenefits | (3,000)bkd_IncomeTaxReconciliationTaxContingenciesUnrecognizedTaxBenefits | 193,000 bkd_IncomeTaxReconciliationTaxContingenciesUnrecognizedTaxBenefits
(Loss) gain on acquisition | 0 bkd_EffectiveIncomeTaxRateReconciliationGainOnAcquisition | 0 bkd_EffectiveIncomeTaxRateReconciliationGainOnAcquisition | (266,000)bkd_EffectiveIncomeTaxRateReconciliationGainOnAcquisition
Deferred income tax assets [Abstract] |  |  |
Operating loss carryforwards | 227,956,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 150,755,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Accrued expenses | 146,536,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 54,400,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities |
Prepaid revenue | 5,835,000 us-gaap_DeferredTaxAssetsDeferredIncome | 53,228,000 us-gaap_DeferredTaxAssetsDeferredIncome |
Deferred lease liability | 77,790,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent | 49,864,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent |
Capital lease obligations | 945,000,000 bkd_DeferredTaxAssetsCapitalLeaseObligations | 39,748,000 bkd_DeferredTaxAssetsCapitalLeaseObligations |
Tax credits | 34,860,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 32,673,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
Intangible Assets | 17,785,000 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 0 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets |
Deferred gain on sale leaseback | 7,073,000 us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction | 8,673,000 us-gaap_DeferredTaxAssetsDeferredGainOnSaleLeasebackTransaction |
Total gross deferred income tax asset | 1,462,835,000 us-gaap_DeferredTaxAssetsGross | 389,341,000 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (9,213,000)us-gaap_DeferredTaxAssetsValuationAllowance | (72,366,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred income tax assets | 1,453,622,000 us-gaap_DeferredTaxAssetsNet | 316,975,000 us-gaap_DeferredTaxAssetsNet |
Deferred income tax liabilities [Abstract] |  |  |
Property, plant and equipment | (1,556,603,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (374,431,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Investment in unconsolidated ventures | (54,113,000)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates | 0 us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates |
Other | (2,181,000)us-gaap_DeferredTaxLiabilitiesOther | (6,200,000)us-gaap_DeferredTaxLiabilitiesOther |
Total gross deferred income tax liability | (1,612,897,000)us-gaap_DeferredTaxLiabilities | (380,631,000)us-gaap_DeferredTaxLiabilities |
Net deferred tax liability | (159,275,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | (63,656,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |
Deferred tax assets (liabilities), Net [Abstract] |  |  |
Deferred tax asset - current | 84,199,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 17,643,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent |
Deferred tax liability - noncurrent | (243,474,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent | (81,299,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent |
Net deferred tax liability | (159,275,000)us-gaap_DeferredTaxAssetsLiabilitiesNet | (63,656,000)us-gaap_DeferredTaxAssetsLiabilitiesNet |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | (182,371,000)us-gaap_DeferredIncomeTaxExpenseBenefit | (183,000)us-gaap_DeferredIncomeTaxExpenseBenefit | (525,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 64,200,000 us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability |  |
Operating loss carry forwards, valuation allowance | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credits, valuation allowance | 1,800,000 us-gaap_TaxCreditCarryforwardValuationAllowance | 20,600,000 us-gaap_TaxCreditCarryforwardValuationAllowance |
Net operating loss, limitation of utilization | 92,000,000 bkd_NetOperatingLossLimitationOfUtilization |  |
Unrecognized tax benefits [Roll Forward] |  |  |
Balance at beginning of period | 1,556,000 us-gaap_UnrecognizedTaxBenefits |  |
Additions for tax positions taken by Emeritus | 29,664,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition |  |
Additions for tax positions related to the current year | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |  |
Additions for tax positions related to prior years | 9,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |  |
Reductions for tax positions related to prior years | (1,034,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |  |
Balance at end of period | 30,195,000 us-gaap_UnrecognizedTaxBenefits | 1,556,000 us-gaap_UnrecognizedTaxBenefits |
Total interest and penalties reserved | 500,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | 766,900,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember | 427,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carry forwards, valuation allowance | 7,500,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 7,000,000 us-gaap_OperatingLossCarryforwardsValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
Emeritus [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Net operating loss, limitation of utilization | 53,900,000 bkd_NetOperatingLossLimitationOfUtilization / us-gaap_IncomeTaxAuthorityAxis = bkd_EmeritusMember |  |
State [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax credits, valuation allowance |  |  | 0 us-gaap_TaxCreditCarryforwardValuationAllowance / us-gaap_IncomeTaxAuthorityAxis = bkd_StateMember
Federal, State and Local [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | 94,100,000 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = bkd_FederalStateAndLocalMember |  |
Restricted Stock [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carry-forwards | $ 112,600,000 us-gaap_OperatingLossCarryforwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 53,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |

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