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Property and Equipment - Other Items Related to Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Unamortized computer software costs $ 40,579us-gaap_CapitalizedComputerSoftwareGross $ 43,317us-gaap_CapitalizedComputerSoftwareGross  
Amortization of capitalized software 8,818us-gaap_CapitalizedComputerSoftwareAmortization 8,688us-gaap_CapitalizedComputerSoftwareAmortization 7,912us-gaap_CapitalizedComputerSoftwareAmortization
Total depreciation expense charged to income $ 27,275us-gaap_Depreciation $ 24,727us-gaap_Depreciation $ 21,504us-gaap_Depreciation