Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Foreign Currency Translation Adjustments, Beginning balance			$ (2,334)
Foreign Currency Translation Adjustments, Current period change	$ 615	$ 1,127	201	$ 735
Foreign Currency Translation Adjustments, Ending balance	(2,535)		(2,535)
Net Unrealized Gain (Loss) on Investment, Beginning balance			(250)
Unrealized gain on investment, net of tax	0	(152)	(4,135)	(152)
Net Unrealized Gain (Loss) on Investment, Ending balance	3,885		3,885
Net Unrealized Losses on Derivatives, Beginning balance			(71)
Unrealized loss on cash flow hedging instruments, net of tax	91	(304)	252	(124)
Net Unrealized Losses on Derivatives, Ending balance	(323)		(323)
Accumulated Other Comprehensive Income (Loss), Beginning balance			(2,655)
Accumulated Other Comprehensive (Income) Loss, Current period change	706	$ 671	(3,682)	$ 459
Accumulated Other Comprehensive Income (Loss), Ending balance	$ 1,027		$ 1,027