DEBT - (Details) (USD $)	0 Months Ended		6 Months Ended					0 Months Ended	6 Months Ended
	Mar. 28, 2013	Aug. 31, 2010	Jun. 30, 2013 Senior secured credit facility due 2015	Mar. 28, 2013 Senior secured credit facility due 2015	Dec. 31, 2012 Senior secured credit facility due 2015	Aug. 31, 2012 Senior secured credit facility due 2015	Aug. 31, 2010 Derivative – Convertible Notes Embedded Derivative(2)	Aug. 31, 2010 Convertible Notes Payable	Jun. 30, 2013 Federal Funds Rate Plus Percentage Senior secured credit facility due 2015	Jun. 30, 2013 London Interbank Offered Rate Plus Percentage Senior secured credit facility due 2015	Jun. 30, 2013 Convertible Debt	Dec. 31, 2012 Convertible Debt	Jun. 30, 2013 Senior secured credit facility due 2015 Accordion Feature [Member]	Jun. 30, 2013 Senior secured credit facility due 2015 Discretionary Over-Advances [Member]	Jun. 30, 2013 Letter of Credit [Member]	Jun. 30, 2013 Letter of Credit [Member] 2012 Credit Facility	Jun. 30, 2013 Bridge Loan [Member] Senior secured credit facility due 2015
Debt Instrument [Line Items]
Stated interest rate								9.50%			9.50%
Convertible Debt, Fair Value Disclosures											$ 9,200,000	$ 68,800,000
Embeded derivative											3,700,000	17,200,000
Weighted average interest rate			2.94%								17.50%
Borrowing capacity under credit agreements				102,500,000.0		80,000,000.0							125,000,000.0	8,000,000		30,000,000.0	10,000,000
Line of Credit Facility, Increase, Additional Borrowings	22,500,000
Outstanding borrowings			21,000,000
Letters of Credit Outstanding, Amount															11,300,000
Unused borrowing capacity under 2012 credit agreement			67,800,000		52,400,000
Basis spread on variable rates basis loans			2.75%						0.50%	1.00%
Duration in which interest rate is applicable			30 days
Second basis spread on base rate loans			1.50%
Letter of credit fee percentage																2.75%
Fronting fee percentage																0.125%
Line of Credit Facility, Commitment Fee Percentage			0.375%
Limitation on borrowing base, accounts receivable, percentage			90.00%
Limitation on borrowing base, accounts receivable, reduction in percentage			85.00%
Limitation on borrowing base, value of eligible inventory, percentage			55.00%
Limitation on borrowing base, product, percentage			85.00%
Limitation on borrowing base, amount, value of eligible trucks			20,000,000.0
Limitation on borrowing base, net orderly liquidation value, percentage			85.00%
Limitation on borrowing base, cost of newly acquired trucks net of a provisions for depreciation on eligible trucks and liquidation of eligible trucks, percentage			80.00%
Reduction to limitation on borrowing base, newly acquired trucks to be reduced by orderly liquidation value of eligible trucks, percentage			85.00%
Reduction to limitation on borrowing base, newly acquired trucks to be reduced by depreciation of eligible trucks since last appraisal, percentage			85.00%
Fixed charge coverage ratio			100.00%
Coverage ratio, measurement period			12 months
Fixed charge coverage ratio			314.00%
Proceeds from Convertible Debt								55,000,000.0
Unamortized discount							13,600,000
Debt Instrument, Face Amount											6,500,000.0
Conversion rate		95.23809524
Principal surrendered for shares		1,000
Closing price of common stock in excess of conversion price, percentage		150.00%
Conversion price numerator		$ 1,000
Closing price of common stock in excess of conversion price, period in which the company may provide a conversion event notice, business days		20 days
Closing price of common stock in excess of conversion price, period of time in which the company may provide a conversion event notice		30 days
Period of time in which the conversion event will terminate		46 days
Period of time in which the conversion holder has to convert its convertible notes		45 days
Period of time in which notes not converted by the conversion termination date may at the holder's election be convert to common stock		180 days
Conversion cap, percentage of common stock outstanding		9.90%