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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	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Revenue	$ 988,345	$ 2,986,342	$ 2,752,660
Net income	$ 20,249	$ 39,387	$ 62,212
Earnings per share
Basic	$ 0.61	$ 1.19	$ 1.82
Diluted	$ 0.61	$ 1.18	$ 1.82

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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-Subparagraph (h)(2)-(3)
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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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