Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits in trusts for employee deferred compensation plans	$ 252,446	$ 236,371
Other	82,914	84,434
Other current assets	$ 335,360	$ 320,805