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Goodwill and Other Intangible Assets Summary of Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Goodwill [Line Items]      
Goodwill $ 2,919,528   $ 2,887,867
Amortization related to deferred tax assets (15)    
Abilene Acquisition [1] 27,702    
2017 Merger September 9, 2017 opening balance sheet adjustment [2] 3,974    
Goodwill impairments 0 $ 0  
Swift Truckload [Member]      
Goodwill [Line Items]      
2017 Merger September 9, 2017 opening balance sheet adjustment 4,800    
Swift Dedicated [Member]      
Goodwill [Line Items]      
2017 Merger September 9, 2017 opening balance sheet adjustment 1,100    
Swift Refrigerated [Member]      
Goodwill [Line Items]      
2017 Merger September 9, 2017 opening balance sheet adjustment (1,900)    
Knight Trucking [Member]      
Goodwill [Line Items]      
Abilene Acquisition $ 27,702    
[1] The goodwill associated with the Abilene Acquisition was allocated to the Knight Trucking segment. See Note 4 regarding the amount attributed to adjustments to the March 17, 2018 opening balance sheet.
[2] The goodwill adjustment associated with the 2017 Merger resulted in a $4.8 million increase, a $1.1 million increase, and a $1.9 million decrease in goodwill allocated to the Swift Truckload, Swift Dedicated, and Swift Refrigerated segments, respectively. See Note 4 regarding the nature of the adjustment.