Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	$ 20,787	$ 20,910
Derivative assets:
Foreign currency contracts	582	112
Total assets at fair value	21,369	21,022
Derivative liabilities:
Foreign currency contracts	95	305
Interest rate contracts	81	53
Total liabilities at fair value	176	358
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	20,787	20,910
Derivative assets:
Total assets at fair value	20,787	20,910
Level 2 [Member]
Derivative assets:
Foreign currency contracts	582	112
Total assets at fair value	582	112
Derivative liabilities:
Foreign currency contracts	95	305
Interest rate contracts	81	53
Total liabilities at fair value	$ 176	$ 358