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Discontinued Operations - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Aug. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Revenue $ 933,224,000 $ 824,809,000 $ 2,665,300,000 $ 2,213,824,000  
Hub Group , Inc [Member] | Consolidation, Eliminations [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Revenue 2,700,000 12,500,000 17,900,000 37,400,000  
Mode LLC [Member] | Consolidation, Eliminations [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Revenue $ 10,600,000 $ 12,700,000 $ 42,200,000 $ 37,000,000  
Mode LLC [Member] | Purchase Agreement [Member]          
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]          
Total consideration received         $ 238,500