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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other income                      
Gain on Disposition                 $ 132,448    
Income from discontinued operations $ 15,237 $ 88,846 $ 4,897 $ 5,099 $ 3,861 $ 3,669 $ 3,818 $ 3,791 114,079 $ 15,139 $ 17,159
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                 739,534 908,870 819,572
Transportation costs                 648,986 788,982 696,107
Gross margin                 90,548 119,888 123,465
Costs and expenses:                      
Salaries and benefits                 11,043 12,821 14,340
Agent fees and commissions                 56,631 73,955 72,754
General and administrative                 5,795 8,071 7,841
Depreciation and amortization                 632 1,158 1,253
Total costs and expenses                 74,101 96,005 96,188
Operating income from discontinued operations                 16,447 23,883 27,277
Other income                      
Interest income                 22 67 47
Other, net                 (15) 56 70
Gain on Disposition                 132,448    
Total other income                 132,455 123 117
Income from discontinued operations before income taxes                 148,902 24,006 27,394
Provision for income taxes                 34,823 8,867 10,235
Income from discontinued operations                 $ 114,079 $ 15,139 $ 17,159