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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Assets [Abstract]    
Operating lease right-of-use assets $ 308,965  
Deferred income taxes 97,629 $ 89,000
Overfunded pension plans 83,095 75,158
Cash surrender value of life insurance contracts 46,159 43,179
Other 54,919 81,336
Total $ 590,767 $ 288,673