Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Assets [Abstract]
Operating lease right-of-use assets	$ 283,133	$ 287,870
Deferred income taxes	110,381	125,552
Overfunded pension plans	94,349	85,657
Cash surrender value of life insurance contracts	47,234	47,578
Other	56,119	61,759
Total	$ 591,216	$ 608,416