Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Assets [Abstract]
Operating lease right-of-use assets	$ 299,790
Deferred income taxes	76,863	$ 89,000
Overfunded pension plans	85,735	75,158
Cash surrender value of life insurance contracts	46,347	43,179
Other	52,514	81,336
Total	$ 561,249	$ 288,673