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Property and Equipment, Net - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Buildings $ 1,606 $ 1,602
Data processing equipment 94,523 77,588
Furniture and equipment 8,170 7,540
Leasehold improvements 3,649 2,964
Property and equipment 107,948 89,694
Less-accumulated depreciation and amortization (75,244) (61,580)
Depreciable assets, net 32,704 28,114
Land 1,424 1,421
Property and equipment, net $ 34,128 $ 29,535
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 30 years  
Data Processing Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Data Processing Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Furniture and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Furniture and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 20 years  
Leasehold Improvements [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, useful life 10 years