Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		12 Months Ended				7 Months Ended	12 Months Ended	5 Months Ended	7 Months Ended		5 Months Ended	7 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 01, 2012	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	May 31, 2012 Minimum [Member] Personal Injury and Property Damage [Member]	Dec. 31, 2012 Minimum [Member] Personal Injury and Property Damage [Member]	Dec. 31, 2012 Maximum [Member]	May 31, 2012 Maximum [Member] Personal Injury and Property Damage [Member]	Dec. 31, 2012 Maximum [Member] Personal Injury and Property Damage [Member]	Dec. 31, 2012 Steering Tires [Member] Maximum [Member]	Dec. 31, 2012 Original Tread Drive Axle [Member] Minimum [Member]	Dec. 31, 2012 Original Tread Drive Axle [Member] Maximum [Member]	Dec. 31, 2012 Original Tread Trailer Tires [Member] Minimum [Member]	Dec. 31, 2012 Original Tread Trailer Tires [Member] Maximum [Member]	Dec. 31, 2012 Revenue Equipment [Member]	Dec. 31, 2012 Refrigerated Trailers [Member]	Dec. 31, 2012 Tractors [Member]	Dec. 31, 2012 Building and Improvements [Member]	Dec. 31, 2012 Service Equipment [Member]	Dec. 31, 2012 Computers, Software and Related Equipment [Member]
Summary of Significant Accounting Policies [Abstract]
Number of business segments			1
Property, Plant and Equipment [Line Items]
Amortization of tires			$ 2,800,000	$ 4,300,000	$ 3,600,000
Life of tires (in miles)								75,000						100,000	100,000	150,000	125,000	150,000
Estimated useful lives of property and equipment																			6-10			10-39	5-15	3-5
Replacement cycle for revenue equipment																				84	42
Insurance Policies [Line Items]
Insurance deductible						1,000,000
Excess Insurance Coverage									4,000,000	1,000,000		75,000,000	75,000,000
Insurance coverage layer							3,000,000			2,000,000	75,000,000		10,000,000
Stand by letters of credit issued			5,000,000
Adjustment recorded to decrease the loss from operations			567,000
Gain on Sale of Property and Equipment [Abstract]
Gain on sale of property and equipment			(5,892,000)	(5,741,000)	(1,103,000)
Number of tractors sold		421
Number of trailers sold		447
Gain related to the sale of tractors and trailers		4,500,000
Gain related to the sale of an owned facility	678,000
Increase in gain on sale due to the adjustments recorded			$ 428,000