Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Compensation Plan Assets, Current	$ 424,037	$ 406,634
Prepaid expenses	101,846	97,674
Other	50,434	49,841
Other current assets	$ 152,280	$ 147,515