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Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	$ 7.1us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	$ 6.6us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense	$ 4.8us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- 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