Consolidated Balance Sheets Consolidated Balance Sheets [Abstract] Class of Stock [Domain] Assets Assets [Abstract] Current assets: Current assets: [Abstract] Cash and cash equivalents Accounts receivable, net Inventories, net Prepaid expenses and other Deferred income taxes, net Total current assets Investments Property and equipment, net Goodwill, net Other assets, net Total assets Liabilities and shareholders’ equity Liabilities and shareholders’ equity [Abstract] Current liabilities: Current liabilities: [Abstract] Amounts borrowed to finance the purchase of new and used commercial vehicle inventory. Floor plan notes payable Current maturities of long-term debt Current maturities of capital lease obligations Trade accounts payable Accrued expenses Total current liabilities Long-term debt, net of current maturities Capital lease obligations, net of current maturities Other long-term liabilities Deferred income taxes, net Shareholders’ equity: Shareholders’ equity: [Abstract] Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2012 and 2011 Common stock, par value $.01 per share; 60,000,000 class A shares and 20,000,000 class B shares authorized; 27,999,068 class A shares and 10,792,223 class B shares outstanding in 2012; and 27,406,424 class A shares and 10,776,697 class B shares outstanding in 2011 Additional paid-in capital Treasury stock, at cost: 1,639,843 class B shares Retained earnings Accumulated other comprehensive loss, net of tax Total shareholders’ equity Total liabilities and shareholders’ equity Preferred stock, par value (in Dollars per share) Preferred stock, shares authorized Preferred stock, shares outstanding Common stock, par value (in Dollars per share) Common stock, shares authorized Common stock, shares outstanding Treasury stock, shares Consolidated Statements of Income Consolidated Statements of Income [Abstract] Revenues: Revenues: [Abstract] New and used commercial vehicle sales Aggregate revenue recognized during the period derived from parts sold to retail and wholesale customers, as well as revenue from commercial vehicle services and repairs. Parts and service sales Lease and rental Revenues recognized during the period representing fees earned for the arrangement of commercial vehicle financing for customers through various institutions as well as the sale of various insurance and commercial vehicle service contracts to customers. Finance and insurance Other Total revenue Cost of products sold: Cost of products sold: [Abstract] New and used commercial vehicle sales Total cost related to parts sold to retail and wholesale customers, as well as costs related to vehicle services and repairs. Parts and service sales Lease and rental Total cost of products sold Gross profit Selling, general and administrative Depreciation and amortization Gain (loss) on sale of assets Operating income Interest income (expense): Interest income (expense): [Abstract] Interest income Interest expense Total interest expense, net Income from continuing operations before taxes Provision for income taxes Income from continuing operations Income from discontinued operations, net of tax Net income Earnings per common share - Basic: Earnings per common share - Basic: [Abstract] Income from continuing operations (in Dollars per share) Net income (in Dollars per share) Earnings per common share - Diluted: Earnings per common share - Diluted: [Abstract] Income from continuing operations (in Dollars per share) Net income (in Dollars per share) Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income [Abstract] Net income Other comprehensive income (loss) before tax and net of reclassification adjustments: Other comprehensive income (loss) before tax and net of reclassification adjustments: [Abstract] Change in fair value of interest rate swaps Unrealized loss on available-for-sale securities Other comprehensive income (loss), before tax Income tax expense (benefit) related to components of other comprehensive income Other comprehensive income (loss), net of tax Comprehensive income Consolidated Statements Of Shareholders’ Equity Consolidated Statements Of Shareholders’ Equity [Abstract] Equity Component [Domain] Balance, amount Balance, amount Balance, shares (in Shares) Balance, shares (in Shares) Stock options exercised, amount Stock options exercised, shares (in Shares) Stock-based compensation related to stock options, restricted shares and employee stock purchase plan Vesting of restricted share awards, amount Vesting of restricted share awards, shares (in Shares) Issuance of common stock under employee stock purchase plan, amount Issuance of common stock under employee stock purchase plan, shares (in Shares) Other comprehensive income (loss) Tax effect, stock options exercised Consolidated Statements of Cash Flows Consolidated Statements of Cash Flows [Abstract] Cash flows from operating activities: Cash flows from operating activities: [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities- Adjustments to reconcile net income to net cash provided by (used in) operating activities- [Abstract] Depreciation and amortization Gain on sale of property and equipment, net Gain on disposition of equipment centers Stock-based compensation expense related to employee stock options and employee stock purchases Provision for deferred income tax expense Excess tax benefits from stock-based compensation Change in accounts receivable, net Change in inventories Change in prepaid expenses and other, net Change in trade accounts payable Increase or decrease in amounts borrowed to finance the purchase of new and used commercial vehicle inventory. Draws on floor plan notes payable – trade, net Change in accrued expenses Net cash provided by (used in) operating activities Cash flows from investing activities: Cash flows from investing activities: [Abstract] Acquisition of property and equipment Proceeds from the sale of property and equipment Business acquisitions Proceeds from disposition of equipment centers Other Net cash used in investing activities Cash flows from financing activities: Cash flows from financing activities: [Abstract] The net change during the reporting period in commercial vehicle floor plan due by the reporting entity. Draws (payments) on floor plan notes payable - non-trade, net Proceeds from long-term debt Principal payments on long-term debt Principal payments on capital lease obligations Proceeds from issuance of shares relating to employee stock options and employee stock purchases Excess tax benefits (provision) from stock-based compensation Debt issuance costs Net cash provided by financing activities Net (decrease) increase in cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of year Supplemental disclosure of cash flow information: Supplemental disclosure of cash flow information: [Abstract] Cash paid during the year for: Cash paid during the year for: [Abstract] Interest Income taxes, net of refunds Noncash investing and financing activities: Noncash investing and financing activities: [Abstract] Note receivable related to disposition of equipment centers Assets acquired under capital leases Note 1 - Organization and Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Note 2 - Significant Accounting Policies Significant Accounting Policies [Text Block] Note 3 - Supplier And Customer Concentration Concentration Risk Disclosure [Text Block] Note 4 - Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Note 5 - Inventories Inventory Disclosure [Text Block] Note 6 - Valuation Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Note 7 - Floor Plan Notes Payable And Lines Of Credit Debt Disclosure [Text Block] Note 8 - Long-Term Debt Long-term Debt [Text Block] Note 9 - Financial Instruments and Fair Value Fair Value Disclosures [Text Block] Note 10 - Leasing Activities Leases of Lessee Disclosure [Text Block] Note 11 - Share Based Compensation And Employee Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Note 12 - Earnings Per Share Earnings Per Share [Text Block] Note 13 - Income Taxes Income Tax Disclosure [Text Block] Note 14 - Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Note 15 - Acquisitions Business Combination Disclosure [Text Block] Note 16 - Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Note 17 - Accumulated Other Comprehensive (Loss) Comprehensive Income (Loss) Note [Text Block] Note 18 - Unaudited Quarterly Financial Data Quarterly Financial Information [Text Block] Note 19 - Segments Segment Reporting Disclosure [Text Block] Significant Accounting Policies (Abstract) Significant Accounting Policies Consolidation, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Inventory, Policy [Policy Text Block]