Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred compensation trust assets	$ 445,739	$ 398,442
Prepaid expenses	83,731	84,364
Other	46,952	42,768
Other current assets	$ 576,422	$ 525,574