Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits in trusts for employee deferred compensation plans	$ 188,951	$ 172,237
Other	71,284	73,100
Other current assets	$ 260,235	$ 245,337