Acquisition - Unaudited Pro forma Consolidated Results of Operations (Detail) - Choptank Transport, LLC Member - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2021
Business Acquisition [Line Items]
Revenue	$ 1,101,750	$ 2,115,680
Net Income	$ 27,186	$ 43,724
Earnings per share
Basic	$ 0.81	$ 1.31
Diluted	$ 0.80	$ 1.29

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Per basic share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Per diluted share amount of pro forma income from continuing operations, after tax, as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
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- Definition

Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
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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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