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Related Party Transactions (Schedule Of Services Received And Provided By Company) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transaction [Line Items]      
Receivable $ 1,066 $ 1,693 $ 2,080
Payable 75 558 29
Freight Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 175 9,382 10,405
Services Received by Swift 47 50 46
Facility Leases [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 736 731 634
Services Received by Swift 599 626 480
Other Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 1,159 135 0
Services Received by Swift 996 1,175 417
Central Freight Lines, Inc. [Member]
     
Related Party Transaction [Line Items]      
Receivable 1,034 1,460 1,891
Payable 74 48 19
Central Freight Lines, Inc. [Member] | Freight Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 15 8,117 9,345
Services Received by Swift 47 50 46
Central Freight Lines, Inc. [Member] | Facility Leases [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 716 711 614
Services Received by Swift 399 626 480
Central Freight Lines, Inc. [Member] | Other Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 1,000 0 0
Services Received by Swift 0 0 0
Other Affiliated Entities [Member]
     
Related Party Transaction [Line Items]      
Receivable 32 233 189
Payable 1 510 10
Other Affiliated Entities [Member] | Freight Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 160 1,265 1,060
Services Received by Swift 0 0 0
Other Affiliated Entities [Member] | Facility Leases [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 20 20 20
Services Received by Swift 200 0 0
Other Affiliated Entities [Member] | Other Services [Member]
     
Related Party Transaction [Line Items]      
Services Provided by Swift 159 135 131
Services Received by Swift $ 996 $ 1,175 $ 417