Fair Value Disclosures (Detail) - Assets And Liabilities Measured At Fair Value On Recurring Basis - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Assets:
Assets measured at fair value on a recurring basis	$ 37,106	$ 34,755
Fair Value, Inputs, Level 1 | Deferred compensation plan assets
Assets:
Assets measured at fair value on a recurring basis	10,051	8,671
Fair Value, Inputs, Level 2
Assets:
Assets measured at fair value on a recurring basis	27,055	26,084
Liabilities:
Liabilities measured at fair value on a recurring basis	57,092	44,578
Fair Value, Inputs, Level 2 | Foreign currency forward contracts
Assets:
Assets measured at fair value on a recurring basis	58	610
Liabilities:
Liabilities measured at fair value on a recurring basis	125	375
Fair Value, Inputs, Level 2 | Interest rate swap contract
Liabilities:
Liabilities measured at fair value on a recurring basis	14,907	5,132
Fair Value, Inputs, Level 2 | Deferred compensation plan assets
Assets:
Assets measured at fair value on a recurring basis	26,997	25,474
Fair Value, Inputs, Level 2 | Deferred compensation plan liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 42,060	$ 39,071