Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (3,499)	$ 2,429	$ (1,613)	$ 2,454
Foreign currency translation	(129)	(2,333)	(2,062)	(2,394)
Unrealized gain (Loss) on investments before reclassification, net of tax		(51)	47	(18)
Reclassification adjustment for net gains realized in net income, net of tax		(8)		(5)
Ending Balance	(3,628)	37	(3,628)	37
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(27)	52	(74)	16
Unrealized gain (Loss) on investments before reclassification, net of tax		(51)	47	(18)
Reclassification adjustment for net gains realized in net income, net of tax		(8)		(5)
Ending Balance	(27)	(7)	(27)	(7)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,472)	2,377	(1,539)	2,438
Foreign currency translation	(129)	(2,333)	(2,062)	(2,394)
Ending Balance	$ (3,601)	$ 44	$ (3,601)	$ 44