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Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Retirement Plans [Abstract] |  |  |
Matching Contributions Equal To Employees Contributions | 25.00% | 25.00% | 25.00%
Maximum contributed compensation | 4.00% | 4.00% | 4.00%
Additional matching contribution | 12.50% | 12.50% | 12.50%
Expense related to retirement savings plan | $ 8.2 | $ 6.6 | $ 7.1

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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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- References No definition available. + 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 amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration