Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities
Net loss	$ (36,670)	$ (11,930)	$ (16,415)
Non-cash items included in net loss
Gain on sale of property and equipment	(5,741)	(1,103)	(136)
Depreciation and amortization	22,078	20,151	22,105
Provision for losses on accounts receivable	1,081	918	247
Deferred income taxes	(2,322)	(5,474)	(4,092)
Deferred compensation	316	989	413
Investment income	(914)	(816)	(739)
Change in operating assets and liabilities
Accounts receivable	(2,610)	(1,521)	11,184
Tires on equipment in use	(4,254)	(4,004)	(3,969)
Other current assets	(2,510)	6,607	(1,549)
Other assets	(1,495)	(451)	(79)
Accounts payable	3,303	4,612	1,319
Insurance and claims accruals	2,380	(3,423)	3,297
Accrued liabilities, payroll and other	146	(571)	(466)
Net cash (used in) provided by operating activities	(27,212)	3,984	11,120
Cash flows from investing activities
Expenditures for property and equipment	(22,118)	(20,858)	(19,733)
Proceeds from sale of property and equipment	22,540	7,094	10,820
Cash distributions from investment	1,596	1,016	860
Other	0	76	(94)
Net cash provided by (used in) investing activities	2,018	(12,672)	(8,147)
Cash flows from financing activities
Proceeds from borrowings	118,501	51,026	37,796
Repayments of borrowings	(104,302)	(45,337)	(37,796)
Proceeds from notes payable and capital lease obligations	11,453	0	0
Repayments of notes payable and capital lease obligations	(616)	0	0
Dividends paid	0	0	(516)
Income tax benefit (expense) of stock options and restricted stock	33	(60)	(33)
Proceeds from capital stock transactions	22	671	96
Purchases of treasury stock	(52)	(76)	(161)
Net cash provided by (used in) financing activities	25,039	6,224	(614)
Net (decrease) increase in cash and cash equivalents	(155)	(2,464)	2,359
Cash and cash equivalents at beginning of year	1,203	3,667	1,308
Cash and cash equivalents at end of year	1,048	1,203	3,667
Supplemental disclosure of cash flow information:
Interest paid	552	58	29
Stock options	$ 582	$ 0	$ 0

Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).