Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (1,613)
Foreign currency translation	$ 1,067	$ (106)	(1,933)	$ (61)
Unrealized gain (loss) on investments before reclassification, net of tax	(51)	27	47	33
Reclassification adjustment for net gain (losses) realized in net income, net of tax		(2)		3
Ending Balance	(3,499)	2,429	(3,499)	2,429
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gain (loss) on investments before reclassification, net of tax	(51)	27	47	33
Reclassification adjustment for net gain (losses) realized in net income, net of tax		(2)		3
Ending Balance	(27)	52	(27)	52
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation	1,067	(106)	(1,933)	(61)
Ending Balance	$ (3,472)	$ 2,377	$ (3,472)	$ 2,377