Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 425,720	$ 448,690
Less: accumulated depreciation	305,991	324,521
Property and equipment, net	119,729	124,169	147,613
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property and equipment, gross	209,007	200,567
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	16,196	22,785
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,103	41,573
Computer and communications equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 160,414	$ 183,765