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Retirement Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Retirement Plans [Abstract] |  |  |
Matching contributions equal to employee's contributions | 25.00%bkd_MatchingContributionsEqualToEmployeesContributions | 25.00%bkd_MatchingContributionsEqualToEmployeesContributions | 25.00%bkd_MatchingContributionsEqualToEmployeesContributions
Maximum contributed compensation | 4.00%bkd_MaximumContributedCompensation | 4.00%bkd_MaximumContributedCompensation | 4.00%bkd_MaximumContributedCompensation
Additional matching contribution | 12.50%bkd_AdditionalMatchingContribution | 12.50%bkd_AdditionalMatchingContribution | 12.50%bkd_AdditionalMatchingContribution
Expense related to retirement savings plan | $ 7.1 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 6.6 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | $ 4.8 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense

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- Definition Percentage of additional matching contribution by the employer into the retirement plan. + References No definition available. + Details
Name: | bkd_AdditionalMatchingContribution
Namespace Prefix: | bkd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of the employer's matching contribution to the plan. + References No definition available. + Details
Name: | bkd_MatchingContributionsEqualToEmployeesContributions
Namespace Prefix: | bkd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the maximum contributed compensation. + References No definition available. + Details
Name: | bkd_MaximumContributedCompensation
Namespace Prefix: | bkd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration