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Fair Value Measurement - Nonrecurring Measurement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value, nonrecurring   $ 0
Liabilities, fair value, nonrecurring $ 0 $ 0
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Software [1] 0  
Equipment [2] 350  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Software [1] 0  
Equipment [2] 0  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Software [1] 0  
Equipment [2] 0  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Software [1] 0  
Equipment [2] 350  
Revenue Equipment [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equipment 400  
Revenue Equipment [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment [2] (98)  
Software and Software Development Costs [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment [1] $ (16,746)  
[1] The Company terminated the implementation of the Swift ERP system in 2017. The related impairment loss was included in "Impairments" within operating income in the consolidated income statement (within Swift's non-reportable segments).
[2] Management reassessed the fair value of certain Interstate Equipment Leasing, LLC tractors as of December 31, 2017, which had a total book value of $0.4 million, determining that there was an impairment loss. The impairment loss was included in "Impairments" within operating income in the consolidated income statement (within Swift's non-reportable segments).