Fair Value Measurements - Schedule of Financial Instruments Outstanding Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Carrying Amount [Member]
Recurring
Forward contracts	$ 911	$ 1,680
Financial instruments not measured at fair value
Debt	(537,258)	(536,977)
Fair value [Member]
Recurring
Forward contracts	911	1,680
Financial instruments not measured at fair value
Debt	(552,651)	(558,077)
Level 2 [Member]
Recurring
Forward contracts	911	1,680
Financial instruments not measured at fair value
Debt	(510,460)	(515,735)
Level 3 [Member]
Financial instruments not measured at fair value
Debt	$ (42,191)	$ (42,342)