Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 107,379	$ 116,979
Less—accumulated depreciation and amortization	(70,793)	(79,431)
Depreciable assets, net	36,586	37,548
Land	1,338	1,382
Property and equipment, net	$ 37,924	38,930
Buildings
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	30 years
Property and equipment, gross	$ 1,531	1,559
Data processing equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 103,426	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	$ 232	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	$ 2,190	$ 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