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Schedule of Income from Discontinued Operations (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Other income  
Income from discontinued operations $ 5,098
Mode [Member] | Discontinued Operations Disposed of By Sale [Member]  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Revenue 258,628
Transportation costs 226,876
Gross margin 31,752
Costs and expenses:  
Salaries and benefits 3,703
General and administrative 21,209
Depreciation and amortization 242
Total costs and expenses 25,154
Operating income from discontinued operations 6,598
Other income  
Interest income 10
Other, net (5)
Total other income 5
Income from discontinued operations before income taxes 6,603
Provision for income taxes 1,505
Income from discontinued operations $ 5,098