Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	$ (29,712)	$ (14,699)	$ (39,305)	$ (14,810)	$ (36,650)
Other comprehensive income (loss) before reclassifications	(7,012)	(9,164)	2,890	(10,582)
Amounts reclassified from accumulated other comprehensive (income) loss	74	2,783	(235)	4,312
Net current-period other comprehensive income (loss)	(6,938)	(6,381)	2,655	(6,270)
Ending balance	(36,650)	(21,080)	(36,650)	(21,080)
Derivative adjustments [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	(7,506)	(6,887)	2,074	(7,771)
Other comprehensive income (loss) before reclassifications	12,393	4,019	3,122	3,374
Amounts reclassified from accumulated other comprehensive (income) loss	74	2,783	(235)	4,312
Net current-period other comprehensive income (loss)	12,467	6,802	2,887	7,686
Ending balance	4,961	(85)	4,961	(85)
Unrealized gain on investments [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	440	63	75	90
Other comprehensive income (loss) before reclassifications	34	88	399	61
Net current-period other comprehensive income (loss)	34	88	399	61
Ending balance	474	151	474	151
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]
Beginning balance	(22,646)	(7,875)	(41,454)	(7,129)
Other comprehensive income (loss) before reclassifications	(19,439)	(13,271)	(631)	(14,017)
Net current-period other comprehensive income (loss)	(19,439)	(13,271)	(631)	(14,017)
Ending balance	$ (42,085)	$ (21,146)	$ (42,085)	$ (21,146)