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Property and Equipment, net (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 118,535   $ 116,979
Less - accumulated depreciation and amortization (82,683)   (79,431)
Depreciable assets, net 35,852   37,548
Land 1,366   1,382
Property and equipment, net 37,218   38,930
Depreciation and amortization expense related to property and equipment $ 3,700 $ 3,400  
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 30 years    
Property and equipment, gross $ 1,541   1,559
Data processing equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 107,518   105,052
Data processing equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years    
Data processing equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 5 years    
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 6,362   7,311
Furniture and equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 3 years    
Furniture and equipment | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 20 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 3,114   $ 3,057
Leasehold improvements | Minimum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 5 years    
Leasehold improvements | Maximum      
Property, Plant and Equipment [Line Items]      
Property and equipment, useful life 10 years