Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (50,058)	$ (41,450)
Other comprehensive income (loss) before reclassifications	5,094	8,571
Amounts reclassified from accumulated other comprehensive loss (income)	3	(250)
Net current-period other comprehensive income (loss)	5,097	8,321
Ending balance	(44,961)	(33,129)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(57,326)	(43,599)
Other comprehensive income (loss) before reclassifications	6,619	13,733
Net current-period other comprehensive income (loss)	6,619	13,733
Ending balance	(50,707)	(29,866)
Derivative adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	6,587	2,074
Other comprehensive income (loss) before reclassifications	(1,801)	(5,482)
Amounts reclassified from accumulated other comprehensive loss (income)	3	(250)
Net current-period other comprehensive income (loss)	(1,798)	(5,732)
Ending balance	4,789	(3,658)
Unrealized gain on investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	681	75
Other comprehensive income (loss) before reclassifications	276	320
Net current-period other comprehensive income (loss)	276	320
Ending balance	$ 957	$ 395