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Unaudited Pro forma Consolidated Results of Operations (Detail) - Estenson Logistics, LLC [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Revenue | $	$ 2,329,361
Net income | $	$ 27,887
Earnings per share
Basic | $ / shares	$ 0.84
Diluted | $ / shares	$ 0.84

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Business acquisition, pro forma earnings per share, basic and diluted.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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