Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	$ (72,114)	$ (62,330)	$ (18,502)
Total other comprehensive income (loss)	(47,138)	14,255	34,835
Balance, ending	(39,637)	(72,114)	(62,330)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	14,460	(190)	(35,551)
Other comprehensive income (loss) before reclassifications	(52,873)	14,650	35,361
Total other comprehensive income (loss)	(52,873)	14,650	35,361
Balance, ending	(38,413)	14,460	(190)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	(436)	(41)	485
Other comprehensive income (loss) before reclassifications	7,736	(1,032)	(3,748)
Amounts reclassified from accumulated other comprehensive income (loss)	(2,001)	637	3,222
Total other comprehensive income (loss)	5,735	(395)	(526)
Balance, ending	5,299	(436)	(41)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning	14,024	(231)	(35,066)
Other comprehensive income (loss) before reclassifications	(45,137)	13,618	31,613
Amounts reclassified from accumulated other comprehensive income (loss)	(2,001)	637	3,222
Total other comprehensive income (loss)	(47,138)	14,255	34,835
Balance, ending	$ (33,114)	$ 14,024	$ (231)