Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits in trusts for employee deferred compensation plans	$ 207,986	$ 198,256
Other	78,321	70,524
Other current assets	$ 286,307	$ 268,780