Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning			$ (39,637)	$ (72,114)
Net current-period other comprehensive income (loss)	$ 16,211	$ 6,960	13,055	(26,358)
Balance, ending	(33,793)	(70,490)	(33,793)	(70,490)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(38,896)	(20,864)	(38,413)	14,460
Other comprehensive income (loss) before reclassifications	20,116	9,362	19,633	(25,962)
Net current-period other comprehensive income (loss)	20,116	9,362	19,633	(25,962)
Balance, ending	(18,780)	(11,502)	(18,780)	(11,502)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	2,626	1,570	5,299	(436)
Other comprehensive income (loss) before reclassifications	(1,870)	(1,594)	(1,937)	909
Amounts reclassified from accumulated other comprehensive income	(2,035)	(808)	(4,641)	(1,305)
Net current-period other comprehensive income (loss)	(3,905)	(2,402)	(6,578)	(396)
Balance, ending	(1,279)	(832)	(1,279)	(832)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(36,270)	(19,294)	(33,114)	14,024
Other comprehensive income (loss) before reclassifications	18,246	7,768	17,696	(25,053)
Amounts reclassified from accumulated other comprehensive income	(2,035)	(808)	(4,641)	(1,305)
Net current-period other comprehensive income (loss)	16,211	6,960	13,055	(26,358)
Balance, ending	$ (20,059)	$ (12,334)	$ (20,059)	$ (12,334)