Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Comprehensive Income Loss [Line Items]
Unrealized gains (losses) on hedging transactions, Gross (recognized in OCI)	$ 3,297	$ (14,757)	$ 12,196
Foreign currency translation adjustments	(7,839)	(8,721)	(8,963)	(8,275)
Unrealized gains (losses) on hedging transactions, Income tax (benefit) (recognized in OCI)	862	(3,900)	3,615
Unrealized gains (losses) on hedging transactions, Net (recognized in OCI)	2,435	(10,857)	8,581
Unrealized gains (losses) on investments, Gross (recognized in OCI)	(1,294)	1,052	(756)
Unrealized gains (losses) on investments, Income tax (benefit) (recognized in OCI)	(423)	349	(269)
Unrealized gains (losses) on investments, Net (recognized in OCI)	(871)	703	(487)
Foreign currency translation adjustments (recognized in OCI)	566	321	178
Total accumulated other comprehensive loss (recognized in OCI)	2,130	(9,833)	8,272
Unrealized gains (losses) on hedging transactions, Gross (reclassified from AOCI to income)	(3,089)	4,821	(3,318)
Unrealized gains (losses) on hedging transactions, Income tax (benefit) (reclassified from AOCI to income)	(772)	1,205	(946)
Unrealized gains (losses) on hedging transactions, Net (reclassified from AOCI to income)	(2,317)	3,616	(2,372)
Unrealized gains (losses) on investments, Gross (reclassified from AOCI to income)	603	285	159
Unrealized gains (losses) on investments, Income tax (benefit) (reclassified from AOCI to income)	188	101	57
Unrealized gains (losses) on investments, Net (reclassified from AOCI to income)	415	184	102
Foreign currency translation adjustments (reclassified from AOCI to income)	316	(79)	(866)
Total accumulated other comprehensive loss (reclassified from AOCI to income)	(1,586)	3,721	(3,136)
Unrealized gains (losses) on hedging transactions, Gross (Subtotal)	208	(9,936)	8,878
Unrealized gains losses on hedging transactions, (Income) tax (benefit) (Subtotal)	90	(2,695)	2,669
Unrealized gains (losses) on hedging transactions, Net (Subtotal)	118	(7,241)	6,209
Unrealized gains (losses) on investments, Gross (Subtotal)	(691)	1,337	(597)
Unrealized gains (losses) on investments, Income tax (benefit) (Subtotal)	(235)	450	(212)
Unrealized gains (losses) on investments, Net (Subtotal)	(456)	887	(385)
Foreign currency translation adjustments (Subtotal)	882	242	(688)
Total accumulated other comprehensive loss (Subtotal)	544	(6,112)	5,136
Total accumulated other comprehensive gains (losses)	(9,781)	(10,325)	(4,213)	(9,349)
Hedging [Member]
Other Comprehensive Income Loss [Line Items]
Unrealized gains (losses) on hedging transactions, Gross	(2,373)	(2,581)	7,355	(1,523)
Unrealized gains (losses) on hedging transactions, Income tax (benefit)	(509)	(599)	2,096	(573)
Total accumulated other comprehensive gains (losses)	(1,864)	(1,982)	5,259	(950)
Investments [Member]
Other Comprehensive Income Loss [Line Items]
Unrealized gains (losses) on hedging transactions, Gross	(151)	540	(797)	(200)
Unrealized gains (losses) on hedging transactions, Income tax (benefit)	(73)	162	(288)	(76)
Total accumulated other comprehensive gains (losses)	$ (78)	$ 378	$ (509)	$ (124)