Acquisition - Preliminary Purchase Price Allocation (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2013	Dec. 31, 2013
Business Acquisition [Line Items]
Purchase price, net of acquired cash		$ 37,827
Intangible assets	$ 13,255
Xtrakter Limited [Member]
Business Acquisition [Line Items]
Purchase price	46,683
Less: acquired cash	(8,856)
Purchase price, net of acquired cash	37,827
Accounts receivable	3,733
Intangible assets	13,255
Other assets	1,718
Deferred tax liability, net	(2,342)
Accounts payable, accrued expenses and deferred revenue	(4,622)
Goodwill	$ 26,085