Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	$ 20,910	$ 20,217
Derivative assets:
Foreign currency contracts	112	73
Total assets at fair value	21,022	20,290
Derivative liabilities:
Foreign currency contracts	305	628
Interest rate contracts	53
Total liabilities at fair value	358
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Mutual fund assets	20,910	20,217
Derivative assets:
Total assets at fair value	20,910	20,217
Level 2 [Member]
Derivative assets:
Foreign currency contracts	112	73
Total assets at fair value	112	73
Derivative liabilities:
Foreign currency contracts	305	$ 628
Interest rate contracts	53
Total liabilities at fair value	$ 358