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Unaudited Pro forma Consolidated Results of Operations (Detail) - Estenson Logistics, LLC [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Revenue | $ 4,148,918 | $ 3,784,604
Net income | $ 139,300 | $ 81,984
Earnings per share |  |
Basic | $ 4.19 | $ 2.42
Diluted | $ 4.18 | $ 2.41

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