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