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Other Assets - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Other Assets [Abstract]    
Operating lease right-of-use assets $ 300,888  
Deferred income taxes 82,928 $ 89,000
Overfunded pension plans 79,122 75,158
Cash surrender value of life insurance contracts 45,444 43,179
Equity method investments 26,735 31,470
Other 48,272 49,866
Total $ 583,389 $ 288,673