XML 20 R54.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Debt (Details) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2014 | Dec. 31, 2011
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | $ 6,165,956,000 us-gaap_LongTermDebt | $ 2,606,578,000 us-gaap_LongTermDebt |  |  | $ 6,165,956,000 us-gaap_LongTermDebt |
Long-term debt | 5,893,691,000 us-gaap_LongTermDebtAndCapitalLeaseObligations | 2,404,624,000 us-gaap_LongTermDebtAndCapitalLeaseObligations |  |  | 5,893,691,000 us-gaap_LongTermDebtAndCapitalLeaseObligations |
Less current portion | 272,265,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | 201,954,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |  |  | 272,265,000 us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Weighted average interest rate | 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate |  |  |  | 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate |
Unamortized debt discount | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount |
Coupon interest | 128,002,000 us-gaap_InterestExpenseDebtExcludingAmortization | 96,131,000 us-gaap_InterestExpenseDebtExcludingAmortization | 98,183,000 us-gaap_InterestExpenseDebtExcludingAmortization |  |  |
Extinguishment of Debt, Amount | 275,900,000 us-gaap_ExtinguishmentOfDebtAmount |  |  |  |  |
Long-term debt maturity [Abstract] |  |  |  |  |  |
2015 | 398,756,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |  | 398,756,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |
2016 | 384,961,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |  | 384,961,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |
2017 | 834,113,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |  | 834,113,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |
2018 | 1,585,148,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |  | 1,585,148,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |
2019 | 441,335,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |  | 441,335,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |
Thereafter | 4,912,439,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |  | 4,912,439,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |
Total obligations | 8,556,752,000 bkd_TotalObligations |  |  |  | 8,556,752,000 bkd_TotalObligations |
Unamortized debt discount | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount |
Less amount representing interest | (2,406,514,000)bkd_LessAmountRepresentingInterest |  |  |  | (2,406,514,000)bkd_LessAmountRepresentingInterest |
Total | 6,165,956,000 us-gaap_LongTermDebt | 2,606,578,000 us-gaap_LongTermDebt |  |  | 6,165,956,000 us-gaap_LongTermDebt |
Mortgages Payable [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 3,105,410,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember | 2,037,649,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |  |  | 3,105,410,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |
Maturity date, start | Mar. 31, 2015 |  |  |  |  |
Maturity date, end | Jan. 01, 2047 |  |  |  |  |
Weighted average interest rate | 4.84%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember | 4.12%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |  |  | 4.84%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |
Unamortized debt premium | 59,600,000 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember | 1,300,000 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |  |  | 59,600,000 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
Total | 3,105,410,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember | 2,037,649,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |  |  | 3,105,410,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = bkd_MortgagesPayableDue2013Through2020MemberMember |
Capital Lease Obligations [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 2,649,226,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 299,824,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  | 2,649,226,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Maturity date | Sep. 30, 2030 |  |  |  |  |
Weighted average interest rate | 8.57%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 8.14%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  | 8.57%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Unamortized debt discount | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
2015 | 246,992,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 246,992,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
2016 | 323,446,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 323,446,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
2017 | 280,077,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 280,077,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
2018 | 283,757,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 283,757,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
2019 | 291,493,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 291,493,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Thereafter | 3,629,975,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 3,629,975,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Total obligations | 5,055,740,000 bkd_TotalObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 5,055,740,000 bkd_TotalObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Unamortized debt discount | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Less amount representing interest | (2,406,514,000)bkd_LessAmountRepresentingInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  |  | (2,406,514,000)bkd_LessAmountRepresentingInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Total | 2,649,226,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | 299,824,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  |  | 2,649,226,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Convertible Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 272,345,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 261,443,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 272,345,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Maturity date | Jun. 30, 2018 |  |  |  |  |
Weighted average interest rate | 2.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 2.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 2.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 2.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Unamortized debt discount | 43,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 54,800,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 43,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Principal | 316,300,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  | 316,300,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 316,300,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Net proceeds from issuance |  |  |  | 308,200,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Initial conversion rate (in shares per $1,000 of principal) |  |  |  | 34.1006 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Equivalent initial conversion price (in dollars per share) |  |  |  | $ 29.325 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Conversion terms |  |  |  | The Notes are convertible at an initial conversion rate of 34.1006 shares of Company common stock per $1,000 principal amount of Notes (equivalent to an initial conversion price of approximately $29.325 per share), subject to adjustment. Holders may convert their Notes at their option prior to the close of business on the second trading day immediately preceding the stated maturity date only under the following circumstances: (i) during any fiscal quarter commencing after the fiscal quarter ending September 30, 2011, if the last reported sale price of the Company's common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the preceding fiscal quarter is greater than or equal to 130% of the applicable conversion price on each applicable trading day; (ii) during the five business day period after any five consecutive trading day period (the "measurement period"), in which the trading price per $1,000 principal amount of notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the applicable conversion rate on each such day; or (iii) upon the occurrence of specified corporate events. On and after March 15, 2018, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Notes at any time, regardless of the foregoing circumstances. Unconverted Notes mature at par in June 2018. |  |
Imputed interest rate |  |  |  | 7.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Expected life of convertible debt |  |  |  | 7 years |  |
Coupon interest | 8,697,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 8,697,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 8,697,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Amortization of discount | 10,902,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 10,131,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 9,415,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Interest expense related to convertible notes | 19,599,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 18,828,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 18,112,000 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Number of shares of common stock covered by hedging transactions (in shares) |  |  |  | 10,784,315 bkd_NumberOfSharesOfCommonStockCoveredByHedgingTransactions / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Number of warrants to acquire common stock sold to Hedge Counterparties (in shares) |  |  |  | 10,784,315 bkd_NumberOfWarrantsToAcquireCommonStock / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Strike price of warrants (in dollars per share) |  |  |  | $ 40.25 bkd_StrikePriceOfWarrants / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Net cost of hedging transaction |  |  |  | 31,900,000 bkd_NetCostOfHedgingTransaction / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |
Conversion rate per value of notes | 1,000 bkd_ConversionRatePerValueOfNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  | 1,000 bkd_ConversionRatePerValueOfNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Number of trading days for pricing | 20 days |  |  |  |  |
Number of consecutive trading days | 30 days |  |  |  |  |
Percentage minimum of applicable conversion price (in hundredths) | 130.00%bkd_PercentageMinimumOfApplicableConversionPrice / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  | 130.00%bkd_PercentageMinimumOfApplicableConversionPrice / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Number of consecutive trading days less than 98% of test period | 5 days |  |  |  |  |
Applicable percentage rate for five day consecutive trading days (in hundredths) | 98.00%bkd_ApplicablePercentageRateForFiveDayConsecutiveTradingDays / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |  | 98.00%bkd_ApplicablePercentageRateForFiveDayConsecutiveTradingDays / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
Unamortized debt discount | 43,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 54,800,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 43,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Total | 272,345,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | 261,443,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  | 272,345,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Construction Financing [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 50,118,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 4,476,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |  |  | 50,118,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |
Maturity date, start | Dec. 31, 2017 |  |  |  |  |
Maturity date, end | Dec. 31, 2019 |  |  |  |  |
Weighted average interest rate | 4.90%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 6.22%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |  |  | 4.90%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
Total | 50,118,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember | 4,476,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |  |  | 50,118,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConstructionLoansMember |
Notes Payable, Insurance Premiums [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 22,586,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3,186,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  | 22,586,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Maturity date | Oct. 31, 2015 |  |  |  |  |
Weighted average interest rate | 2.82%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 2.65%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  | 2.82%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
Total | 22,586,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 3,186,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  | 22,586,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |
Other Notes Payable [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 66,271,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  | 66,271,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Maturity date, start | Aug. 29, 2015 |  |  |  |  |
Maturity date, end | Apr. 15, 2016 |  |  |  |  |
Weighted average interest rate | 4.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  |  | 4.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
Total | 66,271,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  |  | 66,271,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Long-term Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt | 3,516,730,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 3,516,730,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Unamortized debt discount | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Long-term debt maturity [Abstract] |  |  |  |  |  |
2015 | 151,764,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 151,764,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
2016 | 61,515,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 61,515,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
2017 | 554,036,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 554,036,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
2018 | 1,301,391,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 1,301,391,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
2019 | 149,842,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 149,842,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Thereafter | 1,282,464,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 1,282,464,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Total obligations | 3,501,012,000 bkd_TotalObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 3,501,012,000 bkd_TotalObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Unamortized debt discount | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 15,718,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Less amount representing interest | 0 bkd_LessAmountRepresentingInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 0 bkd_LessAmountRepresentingInterest / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
Total | 3,516,730,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |  |  |  | 3,516,730,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember |
First Mortgage Loan Issued on April 3, 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Apr. 30, 2018 |  |  |  |
Number of communities securing debt (in number of communities) |  | 1 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril32013Member |  |  |  |
Description of variable rate basis |  | variable rate equal to 30-day LIBOR plus a margin of 275 basis points |  |  |  |
Basis spread on variable rate basis |  | 0.275%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril32013Member |  |  |  |
Principal |  | 25,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril32013Member |  |  |  |
Extinguishment of Debt, Amount |  | 29,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril32013Member |  |  |  |
First Mortgage Loan Issued on April 12, 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | May 31, 2023 |  |  |  |
Number of communities securing debt (in number of communities) |  | 23 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril122013Member |  |  |  |
Description of variable rate basis |  | variable rate equal to 30-day LIBOR plus a margin of 246 basis points |  |  |  |
Basis spread on variable rate basis |  | 0.246%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril122013Member |  |  |  |
Principal |  | 259,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril122013Member |  |  |  |
Extinguishment of Debt, Amount |  | 275,200,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril122013Member |  |  |  |
Derivative, Remaining Maturity |  | 5 years |  |  |  |
Derivative, Cap Interest Rate |  | 5.03%us-gaap_DerivativeCapInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril122013Member |  |  |  |
Amortization period (in years) |  | 30 years |  |  |  |
First Mortgage Loan Issued on April 22, 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Apr. 30, 2018 |  |  |  |
Number of communities securing debt (in number of communities) |  | 2 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril222013Member |  |  |  |
Description of variable rate basis |  | variable rate equal to 30-day LIBOR plus a margin of 275 basis points |  |  |  |
Basis spread on variable rate basis |  | 0.275%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril222013Member |  |  |  |
Principal |  | 28,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril222013Member |  |  |  |
Extinguishment of Debt, Amount |  | 35,100,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril222013Member |  |  |  |
First Mortgage Loan Issued on May 30, 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of communities securing debt (in number of communities) |  | 8 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnMay302013Member |  |  |  |
Description of variable rate basis |  | variable rate equal to 30-day LIBOR plus a margin of 289 basis points |  |  |  |
Basis spread on variable rate basis |  | 0.289%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnMay302013Member |  |  |  |
Principal |  | 84,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnMay302013Member |  |  |  |
Extinguishment of Debt, Amount |  | 100,900,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnMay302013Member |  |  |  |
Derivative, Remaining Maturity |  | 5 years |  |  |  |
Derivative, Cap Interest Rate |  | 4.68%us-gaap_DerivativeCapInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnMay302013Member |  |  |  |
Term of loan |  | 10 years |  |  |  |
First Mortgage Loan Issued on August 1, 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of communities securing debt (in number of communities) |  | 4 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnAugust12013Member |  |  |  |
Description of variable rate basis |  | variable rate equal to 30-day LIBOR plus a margin ranging from 226 to 288 basis points |  |  |  |
Principal |  | 172,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnAugust12013Member |  |  |  |
Extinguishment of Debt, Amount |  | 142,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnAugust12013Member |  |  |  |
Amortization period (in years) |  | 30 years |  |  |  |
First Mortgage Loan Issued on August 1, 2013 [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate basis |  | 0.226%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnAugust12013Member / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
First Mortgage Loan Issued on August 1, 2013 [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate basis |  | 0.288%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnAugust12013Member / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Loans Maturing in August 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Aug. 31, 2020 |  |  |  |
Principal |  | 75,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_LoansMaturingInAugust2020Member |  |  |  |
Loans Maturing in August 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Aug. 31, 2023 |  |  |  |
Principal |  | 97,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_LoansMaturingInAugust2023Member |  |  |  |
First Mortgage Loan Financing Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal |  | 60,800,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanFinancingAcquisitionMember |  |  |  |
First Mortgage Loan Assumed in Acquisition [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | May 31, 2017 |  |  |  |
Weighted average interest rate |  | 5.75%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanAssumedInAcquisitionMember |  |  |  |
Principal |  | 52,700,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanAssumedInAcquisitionMember |  |  |  |
First Mortgage Loan Issued On October 1 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  | 5.32%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnOctober12013Member |  |  |  |
Number of communities securing debt (in number of communities) |  | 1 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnOctober12013Member |  |  |  |
Principal |  | 8,100,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnOctober12013Member |  |  |  |
Term of loan |  | 7 years |  |  |  |
First Mortgage Loan Issued On December 18 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Dec. 31, 2018 |  |  |  |
Weighted average interest rate |  | 4.50%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember182013Member |  |  |  |
Number of communities securing debt (in number of communities) |  | 2 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember182013Member |  |  |  |
Principal |  | 14,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember182013Member |  |  |  |
Extinguishment of Debt, Amount |  | 14,200,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember182013Member |  |  |  |
First Mortgage Loan Issued On December 20 2013 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date |  | Jan. 31, 2019 |  |  |  |
Weighted average interest rate |  | 4.35%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember202013Member |  |  |  |
Number of communities securing debt (in number of communities) |  | 2 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember202013Member |  |  |  |
Principal |  | 25,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember202013Member |  |  |  |
Extinguishment of Debt, Amount |  | 30,300,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnDecember202013Member |  |  |  |
First mortgage loan issued on April 9, 2014 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date, end | May 31, 2021 |  |  |  |  |
Weighted average interest rate | 4.77%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |  |  |  | 4.77%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |
Number of communities securing debt (in number of communities) | 20 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |  |  |  |  |
Principal | 146,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |  |  |  | 146,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |
Extinguishment of Debt, Amount | 140,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedOnApril92014Member |  |  |  |  |
First mortgage loan issued in October, 2014 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate | 4.60%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedInOctober2014Member |  |  |  | 4.60%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedInOctober2014Member |
Number of communities securing debt (in number of communities) | 21 bkd_NumberOfCommunitiesSecuringMortgageNotes / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedInOctober2014Member |  |  |  |  |
Principal | 89,700,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedInOctober2014Member |  |  |  | 89,700,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = bkd_FirstMortgageLoanIssuedInOctober2014Member |
Debt extinguished with proceeds of public equity offering [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate | 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_DebtExtinguishedWithProceedsOfPublicEquityOfferingMember |  |  |  | 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = bkd_DebtExtinguishedWithProceedsOfPublicEquityOfferingMember |
Extinguishment of Debt, Amount |  |  |  |  | 275,900,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_DebtExtinguishedWithProceedsOfPublicEquityOfferingMember |
RIDEA JV [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 68,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_LongtermDebtTypeAxis = bkd_RideaJvMember |  |  |  |  |

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