Income Tax Effects Related to Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustments, Before-Tax Amount	$ 150	$ (1,482)	$ (49)	$ (1,873)
Net change in unrealized (losses) gains on marketable securities, Before-Tax Amount	9,750	0	(8,365)	(228)
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount	686	(225)	900	5
Other comprehensive (loss) income, Before-Tax Amount	10,586	(1,707)	(7,514)	(2,096)
Foreign currency translation adjustments, Tax Effect	0	0	0	0
Other comprehensive (loss) income, Tax Effect	(270)	88	(355)	86
Foreign currency translation adjustments, Net	150	(1,482)	(49)	(1,873)
Other comprehensive (loss) income, Net	10,316	(1,619)	(7,869)	(2,010)
Unrealized Net Gains (Losses) on Marketable Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Marketable securities, net gain (loss) arising during the period, Before-Tax Amount	9,750	0	(8,365)	0
Marketable securities, net (gain) loss reclassified into income, Before-Tax Amount	0	0	0	(228)
Net change in unrealized (losses) gains on marketable securities, Before-Tax Amount	9,750	0	(8,365)	(228)
Marketable securities, net gain (loss) arising during the period, Tax Effect	0	0	0	0
Marketable securities, net (gain) loss reclassified into income, Tax Effect	0	0	0	88
Net change in unrealized (losses) gains on marketable securities, Tax Effect	0	0	0	88
Marketable securities, net gain (loss) arising during the period, Net	9,750	0	(8,365)	0
Marketable securities, net (gain) loss reclassified into income, Net	0	0	0	(140)
Net change in unrealized (losses) gains on marketable securities, Net	9,750	0	(8,365)	(140)
Other comprehensive (loss) income, Net			(8,365)	(140)
Derivatives Qualifying as Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount	686	(225)	900	5
Derivatives qualifying as cash flow hedges, net gain (loss), Tax Effect	(270)	88	(355)	(2)
Derivatives qualifying as cash flow hedges, net gain (loss), Net	416	(137)	545	3
Other comprehensive (loss) income, Net			545	3
Derivatives Qualifying as Cash Flow Hedges [Member] | Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Derivatives qualifying as cash flow hedges, net gains (losses) arising during the period, Before-Tax Amount	971	(317)	1,172	(87)
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Before-Tax Amount	(285)	92	(272)	92
Derivatives qualifying as cash flow hedges, net gain (loss), Before-Tax Amount	686	(225)	900	5
Derivatives qualifying as cash flow hedges, net gains (losses) arising during the period, Tax Effect	(382)	124	(462)	34
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Tax Effect	112	(36)	107	(36)
Derivatives qualifying as cash flow hedges, net gain (loss), Tax Effect	(270)	88	(355)	(2)
Derivatives qualifying as cash flow hedges, net gains (losses) arising during the period, Net	589	(193)	710	(53)
Derivatives qualifying as cash flow hedges, net (gains) losses reclassified into income, Net	(173)	56	(165)	56
Derivatives qualifying as cash flow hedges, net gain (loss), Net	$ 416	$ (137)	$ 545	$ 3