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Summary of Company's Rent Expense (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rent expense	$ 8,649,000us-gaap_OperatingLeasesRentExpenseNet	$ 6,633,000us-gaap_OperatingLeasesRentExpenseNet	$ 5,371,000us-gaap_OperatingLeasesRentExpenseNet
Continuing Operations
Rent expense	1,460,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	1,400,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember	1,415,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember
Discontinued Operations
Rent expense	$ 7,189,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 5,233,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember	$ 3,956,000us-gaap_OperatingLeasesRentExpenseNet / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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X

- Details

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