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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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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

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