Fair Value Disclosures (Detail) - Assets And Liabilities Measured At Fair Value On Recurring Basis - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Assets measured at fair value on a recurring basis	$ 38,259	$ 34,755
Liabilities:
Liabilities measured at fair value on a recurring basis	45,909	44,578
Level 1
Assets:
Deferred compensation plan assets	10,247	8,671
Assets measured at fair value on a recurring basis	10,247	8,671
Level 2
Assets:
Deferred compensation plan assets	27,847	25,474
Assets measured at fair value on a recurring basis	28,012	26,084
Liabilities:
Deferred compensation plan liabilities	43,075	39,071
Liabilities measured at fair value on a recurring basis	45,909	44,578
Level 2 | Foreign currency forward contracts
Assets:
Derivative asset	165	610
Liabilities:
Derivative liability	485	375
Level 2 | Interest rate swap contracts
Liabilities:
Derivative liability	$ 2,349	$ 5,132