Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Foreign currency forward exchange contracts	$ 27,207	$ 18,106
Available-for-sale security	14,939
Assets, fair value disclosure	42,146
Liabilities:
Foreign currency forward exchange contracts	9,212	3,720
Level 1
Assets:
Foreign currency forward exchange contracts	0	0
Available-for-sale security	14,939
Assets, fair value disclosure	14,939
Liabilities:
Foreign currency forward exchange contracts	0	0
Level 2
Assets:
Foreign currency forward exchange contracts	27,207	18,106
Available-for-sale security	0
Assets, fair value disclosure	27,207
Liabilities:
Foreign currency forward exchange contracts	9,212	3,720
Level 3
Assets:
Foreign currency forward exchange contracts	0	0
Available-for-sale security	0
Assets, fair value disclosure	0
Liabilities:
Foreign currency forward exchange contracts	$ 0	$ 0