Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Property and equipment	$ 39,743	$ 34,089
Accumulated amortization and depreciation	(23,294)	(16,993)
Property and equipment, net	16,449	17,096
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment	12,204	9,739
Furniture and fixtures
Property Plant And Equipment [Line Items]
Property and equipment	2,530	2,176
Software Development
Property Plant And Equipment [Line Items]
Property and equipment	16,406	13,930
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment	2,129	2,124
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment	$ 6,474	$ 6,120