Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 184,436	$ 186,043
Accumulated depreciation and amortization	86,749	76,762
Property and equipment, net	97,687	109,281
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,394	9,501
Building and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 54,541	58,429
Building and building improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Life	27 years 6 months
Building and building improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	39 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,208	1,002
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Life	15 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,219	2,322
Useful Life	5 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 22,492	25,179
Useful Life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,036	8,124
Useful Life	7 years
Other capital assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 128	1,829
Useful Life	5 years
Software development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 79,452	74,737
Useful Life	5 years
Program development
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,966	$ 4,920
Useful Life	3 years