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Equity Investment And Note Receivable- Swift Power Services, LLC (Detail) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
SPS Equity Investee [Member]
Dec. 31, 2012
SPS Equity Investee [Member]
Feb. 29, 2012
Swift Power Services, LLC [Member]
business
Schedule of Equity Method Investments [Line Items]              
Company contribution in Swift Power Services, LLC         $ 0 $ 0 $ 500,000
Ownership interest in Swift Power Services, LLC             49.95%
Number of trucking companies to be acquired             3
Secured promissory note loaned to SPS             7,500,000
Impairments on non-operating assets 6,000,000 0 5,979,000 0      
Equity losses of investee   537,000 1,007,000 (264,000) 277,000 1,000,000  
Carrying value of note receivable, net $ 10,606,000 $ 15,625,000 $ 10,606,000   $ 0 $ 1,000,000