Property and Equipment, Net - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Computer hardware	$ 150,845	$ 148,541
Computer software	299,665	288,532
Furniture and equipment	107,875	111,426
Leasehold improvements	114,829	118,868
Other	8,704	11,488
Property and equipment, cost	681,918	678,855
Accumulated depreciation	(572,000)	(566,211)
Property and equipment, net	$ 109,918	$ 112,644