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Revenue Recognition - Impact of Adoption of New Revenue Standard Requirements on Consolidated Statement of Income and Balance Sheet (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Truckload services revenue $ 80,204 $ 82,812 $ 240,053 $ 231,046  
Brokerage services revenue 98,801 73,285 269,446 195,988  
Intermodal services revenue 65,710 39,057 167,190 113,713  
Dedicated services revenue 30,941 22,135 87,725 71,406  
Purchased transportation and equipment rent expense     526,502    
Commission expense 9,653 8,503 28,298 24,284  
Income tax expense 4,918 (1,966) 14,606 2,378  
Net income 15,055 $ (3,305) 43,158 $ 3,752  
Prepaid expenses and other 25,825   25,825   $ 16,103
Accounts payable 106,999   106,999   84,380
Income taxes payable 2,826   2,826    
Retained earnings 225,485   225,485   $ 186,226
Under ASC 605 [Member] | Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Truckload services revenue     236,704    
Brokerage services revenue     267,281    
Intermodal services revenue     166,717    
Dedicated services revenue     87,470    
Purchased transportation and equipment rent expense     521,496    
Commission expense     28,136    
Income tax expense     14,321    
Net income     42,369    
Prepaid expenses and other 23,419   23,419    
Accounts payable 105,005   105,005    
Income taxes payable 2,541   2,541    
Retained earnings 224,696   224,696    
Adjustment [Member] | Accounting Standards Update 2014-09 [Member]          
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]          
Truckload services revenue     3,349    
Brokerage services revenue     2,165    
Intermodal services revenue     473    
Dedicated services revenue     255    
Purchased transportation and equipment rent expense     5,006    
Commission expense     162    
Income tax expense     285    
Net income     789    
Prepaid expenses and other 2,406   2,406    
Accounts payable 1,994   1,994    
Income taxes payable 285   285    
Retained earnings $ 789   $ 789