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Merger and Acquisition - Summary of the Allocation of Purchase Consideration (Details) - USD ($)
$ in Thousands
Mar. 16, 2018
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill [1]   $ 2,910,101 $ 2,887,867
Abilene [Member]      
Business Acquisition [Line Items]      
Fair value of the consideration transferred $ 103,223    
Cash 1,654    
Trade receivables 11,745    
Other assets 7,785    
Property and equipment 41,403    
Identifiable intangible assets [2] 23,000    
Total assets 85,587    
Accounts payable (1,959)    
Accrued liabilities 2,419    
Claims accruals (230)    
Total liabilities (4,608)    
Goodwill 22,244    
Customer relationship 17,700    
Trade name $ 5,300    
[1] Except for the net accumulated amortization related to deferred tax assets in the Knight Trucking segment, the net carrying amount and gross carrying amount are equal since there are no accumulated impairment losses.
[2] Includes a $17.7 million customer relationship and a $5.3 million trade name.