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Schedule of Income from Discontinued Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other income              
Gain on Disposition           $ 132,448  
Income from discontinued operations $ 15,237 $ 88,846 $ 4,897 $ 5,099   114,079 $ 15,139
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           739,534 908,870
Transportation costs           648,986 788,982
Gross margin           90,548 119,888
Costs and expenses:              
Salaries and benefits           11,043 12,821
Agent fees and commissions           56,631 73,955
General and administrative           5,795 8,071
Depreciation and amortization           632 1,158
Total costs and expenses           74,101 96,005
Operating income from discontinued operations           16,447 23,883
Other income              
Interest income           22 67
Other, net           (15) 56
Gain on Disposition         $ 132,448 132,448  
Total other income           132,455 123
Income from discontinued operations before income taxes           148,902 24,006
Provision for income taxes           34,823 8,867
Income from discontinued operations           $ 114,079 $ 15,139