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Property, Plant and Equipment and Leasehold Intangibles, Net (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	$ 10,295,498,000us-gaap_PropertyPlantAndEquipmentGross				$ 5,717,731,000us-gaap_PropertyPlantAndEquipmentGross				$ 10,295,498,000us-gaap_PropertyPlantAndEquipmentGross	$ 5,717,731,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	(1,905,993,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment				(1,822,256,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment				(1,905,993,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(1,822,256,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment and leasehold intangibles, net	8,389,505,000us-gaap_PropertyPlantAndEquipmentNet				3,895,475,000us-gaap_PropertyPlantAndEquipmentNet				8,389,505,000us-gaap_PropertyPlantAndEquipmentNet	3,895,475,000us-gaap_PropertyPlantAndEquipmentNet
Impaired Long-Lived Assets Held and Used [Line Items]
Asset impairment, non-cash charge	9,992,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	10,233,000us-gaap_AssetImpairmentCharges	504,000us-gaap_AssetImpairmentCharges	2,154,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	9,992,000us-gaap_AssetImpairmentCharges	12,891,000us-gaap_AssetImpairmentCharges	27,677,000us-gaap_AssetImpairmentCharges
Depreciation and amortization expense on property, plant and equipment and leasehold intangibles									529,100,000bkd_DepreciationAndAmortizationExpenseForPlantAndEquipmentAndLeaseholdIntangibles	264,100,000bkd_DepreciationAndAmortizationExpenseForPlantAndEquipmentAndLeaseholdIntangibles	248,500,000bkd_DepreciationAndAmortizationExpenseForPlantAndEquipmentAndLeaseholdIntangibles
Resident And Leasehold Operating Intangibles Future Amortization Expense [Abstract]
2015	264,051,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearOne								264,051,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearOne
2016	23,121,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearTwo								23,121,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearTwo
2017	16,742,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearThree								16,742,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearThree
2018	9,624,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFour								9,624,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFour
2019	5,819,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFive								5,819,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseYearFive
Thereafter	18,858,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseAfterYearFive								18,858,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpenseAfterYearFive
Total	338,215,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpense								338,215,000bkd_ResidentAndLeaseholdOperatingIntangiblesFutureAmortizationExpense
Resident lease intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									1 year
Below Market Operating Lease Intangibles [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									9 years
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	475,485,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember				302,444,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember				475,485,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	302,444,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	5,017,991,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember				3,508,693,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember				5,017,991,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember	3,508,693,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	56,515,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember				59,948,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember				56,515,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember	59,948,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	735,837,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember				623,352,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember				735,837,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember	623,352,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Resident and Leasehold Operating Intangibles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	852,746,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bkd_ResidentAndLeaseholdOperatingIntangiblesMember				435,012,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bkd_ResidentAndLeaseholdOperatingIntangiblesMember				852,746,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bkd_ResidentAndLeaseholdOperatingIntangiblesMember	435,012,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bkd_ResidentAndLeaseholdOperatingIntangiblesMember
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	99,408,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember				88,309,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember				99,408,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember	88,309,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember
Assets Under Capital and Financing Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment and leasehold intangibles gross	$ 3,057,516,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember				$ 699,973,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember				$ 3,057,516,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember	$ 699,973,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember

X

- Definition

The current period expense charged against earnings on long-lived, physical assets not used in production, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset.

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The aggregate estimated amortization expense for succeeding fiscal years for resident and leasehold operating intangible assets subject to amortization.

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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.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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