Income Taxes - Summary of Company's Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred tax assets
Capital loss carryforwards	$ 7,487
Stock compensation expense	6,022	5,296
Other	3,206	2,839
Total deferred tax assets	21,089	15,470
Valuation allowance	(7,743)	(727)	(287)	(249)
Net deferred tax assets	13,346	14,743
Deferred tax liabilities
Depreciation and amortization	(1,905)	(2,025)
Capitalized software development costs	(4,163)	(2,752)
Intangible assets	(2,331)	(524)
Deferred tax assets, net	4,947	9,442
US Country [Member]
Deferred tax assets
U.S net operating loss carryforwards	4,273	7,175
Foreign Country [Member]
Deferred tax assets
Foreign net operating loss carryforwards	$ 101	$ 160