PROPERTY AND EQUIPMENT, NET - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 392,262	$ 382,187
Less: accumulated depreciation	280,871	272,044
Property and equipment, net	111,391	110,143
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	188,952	178,146
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	15,514	15,632
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,092	35,846
Computer and communications equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 151,704	$ 152,563