Other Comprehensive Loss - Components of 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 adjustment, before taxes	$ (613)	$ (1,127)	$ (228)	$ (735)
Unrealized gain on investment, before taxes	0	250	6,661	250
Change in fair value, before taxes	(346)	255	(1,036)	(427)
Reclassification adjustments into earnings, before taxes	196	246	619	630
Net unrealized gain (loss), before taxes	(150)	501	(417)	203
Other comprehensive income (loss), before taxes	(763)	(376)	6,016	(282)
Foreign currency translation adjustment, tax (expense) benefit	(2)	0	27	0
Unrealized gain on investment, tax (expense) benefit	0	(98)	(2,526)	(98)
Change in fair value, tax (expense) benefit	137	(98)	412	173
Reclassification adjustments into earnings, tax (expense) benefit	(78)	(99)	(247)	(252)
Net unrealized gain (loss), tax (expense) benefit	59	(197)	165	(79)
Other comprehensive income (loss), tax (expense) benefit	57	(295)	(2,334)	(177)
Foreign currency translation adjustment, net of taxes	(615)	(1,127)	(201)	(735)
Unrealized gain on investment, net of taxes	0	152	4,135	152
Change in fair value, net of taxes	(209)	157	(624)	(254)
Reclassification adjustments into earnings, net of taxes	118	147	372	378
Net unrealized gain (loss), net of taxes	(91)	304	(252)	124
Other comprehensive income	$ (706)	$ (671)	$ 3,682	$ (459)