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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, 2017
Sep. 30, 2018
Sep. 30, 2017
Other income        
Gain on Disposition     $ 113,601  
Income from discontinued operations $ 88,846 $ 3,746 98,842 $ 11,510
Mode LLC [Member] | Discontinued Operations Disposed of By Sale [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Revenue 196,546 228,858 739,534 656,288
Transportation costs 172,949 198,662 648,986 567,886
Gross margin 23,597 30,196 90,548 88,402
Costs and expenses:        
Salaries and benefits 3,317 3,148 11,043 9,700
Agent fees and commissions 15,572 19,039 56,631 54,005
General and administrative 1,255 1,800 5,795 5,758
Depreciation and amortization 153 288 632 884
Total costs and expenses 20,297 24,275 74,101 70,347
Operating income from discontinued operations 3,300 5,921 16,447 18,055
Other income        
Interest and dividend income 3 17 22 56
Other, net (1) 49 (15) 64
Gain on Disposition 113,601   113,601  
Total other income 113,603 66 113,608 120
Income from discontinued operations before income taxes 116,903 5,987 130,055 18,175
Provision for income taxes 28,057 2,241 31,213 6,665
Income from discontinued operations $ 88,846 $ 3,746 $ 98,842 $ 11,510