Property and Equipment, Net - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Computer hardware	$ 150,106	$ 148,541
Computer software	294,411	288,532
Furniture and equipment	110,296	111,426
Leasehold improvements	119,787	118,868
Other	11,928	11,488
Property and equipment, cost	686,528	678,855
Accumulated depreciation	(574,941)	(566,211)
Property and equipment, net	$ 111,587	$ 112,644