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Unaudited Pro forma Consolidated Results of Operations (Detail) - Estenson Logistics, LLC [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Revenue	$ 983,029	$ 1,930,373
Net income	$ 12,450	$ 24,053
Earnings per share
Basic	$ 0.38	$ 0.73
Diluted	$ 0.38	$ 0.72

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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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-Publisher FASB
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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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