Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Assets [Abstract]
Operating lease right-of-use assets	$ 298,455	$ 287,870
Deferred income taxes	154,504	125,552
Overfunded pension plans	99,212	85,657
Cash surrender value of life insurance contracts	47,417	47,578
Other	56,194	61,759
Total	$ 655,782	$ 608,416