Property and Equipment, net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property and Equipment, net
Property and equipment, gross	$ 117,451		$ 117,451		$ 116,979
Less - accumulated depreciation and amortization	(82,692)		(82,692)		(79,431)
Depreciable assets, net	34,759		34,759		37,548
Land	1,336		1,336		1,382
Property and equipment, net	36,095		36,095		38,930
Depreciation and amortization expense related to property and equipment	3,700	$ 3,400	$ 7,400	$ 6,800
Buildings
Property and Equipment, net
Useful life in years			30 years
Property and equipment, gross	1,529		$ 1,529		1,559
Data processing equipment
Property and Equipment, net
Property and equipment, gross	106,482		$ 106,482		105,052
Data processing equipment | Minimum
Property and Equipment, net
Useful life in years			3 years
Data processing equipment | Maximum
Property and Equipment, net
Useful life in years			5 years
Furniture and equipment
Property and Equipment, net
Property and equipment, gross	6,278		$ 6,278		7,311
Furniture and equipment | Minimum
Property and Equipment, net
Useful life in years			3 years
Furniture and equipment | Maximum
Property and Equipment, net
Useful life in years			20 years
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	$ 3,162		$ 3,162		$ 3,057
Leasehold improvements | Minimum
Property and Equipment, net
Useful life in years			5 years
Leasehold improvements | Maximum
Property and Equipment, net
Useful life in years			10 years