Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Assets:
Foreign currency forward exchange contracts (a)	$ 17,184	$ 27,207	$ 8,569
Available-for-sale security (b)	13,624	14,939
Total assets	30,808	42,146
Liabilities:
Foreign currency forward exchange contracts (a)	15,185	9,212	15,676
Level 1
Assets:
Foreign currency forward exchange contracts (a)	0	0	0
Available-for-sale security (b)	13,624	14,939
Total assets	13,624	14,939
Liabilities:
Foreign currency forward exchange contracts (a)	0	0	0
Level 2
Assets:
Foreign currency forward exchange contracts (a)	17,184	27,207	8,569
Available-for-sale security (b)	0	0
Total assets	17,184	27,207
Liabilities:
Foreign currency forward exchange contracts (a)	15,185	9,212	15,676
Level 3
Assets:
Foreign currency forward exchange contracts (a)	0	0	0
Available-for-sale security (b)	0	0
Total assets	0	0
Liabilities:
Foreign currency forward exchange contracts (a)	$ 0	$ 0	$ 0