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Schedule of Income from Discontinued Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Other income    
Gain on Disposition   $ 113,601
Income from discontinued operations $ 88,846 98,842
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 196,546 739,534
Transportation costs 172,949 648,986
Gross margin 23,597 90,548
Costs and expenses:    
Salaries and benefits 3,317 11,043
General and administrative 16,827 62,426
Depreciation and amortization 153 632
Total costs and expenses 20,297 74,101
Operating income from discontinued operations 3,300 16,447
Other income    
Interest income 3 22
Other, net (1) (15)
Gain on Disposition 113,601 113,601
Total other income 113,603 113,608
Income from discontinued operations before income taxes 116,903 130,055
Provision for income taxes 28,057 31,213
Income from discontinued operations $ 88,846 $ 98,842