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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 8 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
Aug. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                        
Revenue $ 1,018,293 $ 933,224 $ 894,734 $ 837,342 $ 909,239 $ 824,809 $ 708,572 $ 680,443   $ 3,683,593 $ 3,123,063 $ 2,750,449
Hub Group , Inc [Member] | Consolidation, Eliminations [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                        
Revenue                 $ 17,900   51,000 76,100
Mode [Member] | Consolidation, Eliminations [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                        
Revenue                 $ 42,200   $ 50,600 $ 34,400
Mode [Member] | Purchase Agreement [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                        
Total consideration received   $ 238,500                    
Mode [Member] | Purchase Agreement [Member] | Other Receivables [Member]                        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                        
Total consideration received $ 19,000                 $ 19,000