Equity Investment And Note Receivable- Swift Power Services, LLC (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 1 Months Ended | ||||
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Dec. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
SPS Equity Investee [Member]
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Dec. 31, 2012
SPS Equity Investee [Member]
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Feb. 29, 2012
Swift Power Services, LLC [Member]
business
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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 |