Property and Equipment - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total cost	$ 13,585	$ 13,407
Less accumulated depreciation and amortization	(5,873)	(9,839)
Property and equipment, net	7,712	3,568
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Total cost	11,102	11,371
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,182	1,170
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 1,301	$ 866