Property and Equipment - Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 113,667	$ 58,736
Less: accumulated depreciation	(38,107)	(16,394)
Total property and equipment, net	75,560	42,342
Computer Equipment And Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	90,617	46,541
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	13,751	4,691
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	8,371	2,649
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 928	$ 4,855