Property and Equipment - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 596,098	$ 637,205
Less accumulated depreciation	(214,815)	(171,131)
Total property and equipment, net	381,283	466,074
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	260,059	294,208
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,320	28,594
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	89,130	89,130
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	192,556	190,931
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,495	13,959
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 13,538	$ 20,383