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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 income $ 55,213 $ 31,282 $ 5,884
Adjustments to reconcile net income to net cash used in operating activities, net of acquisitions-      
Depreciation and amortization 56,934 45,920 40,698
Gain on sale of property and equipment, net (418) (36) (160)
Gain on disposition of equipment centers   (10,091)  
Stock-based compensation expense related to employee stock options and employee stock purchases 5,683 4,468 3,664
Provision (benefit) for deferred income tax expense 28,680 10,215 (2,980)
Excess tax (benefits) provision from stock-based compensation (1,628) (885) 191
Change in accounts receivable, net (49,986) (217) 16,405
Change in inventories (268,178) (48,548) 104,450
Change in prepaid expenses and other, net 1,999 (10,252) (281)
Change in trade accounts payable 24,366 15,331 (9,103)
Change in accrued expenses 65,966 29,246 (8,473)
Net cash (used in) provided by operating activities (81,369) 66,433 150,295
Cash flows from investing activities:      
Acquisition of property and equipment (148,543) (84,303) (50,485)
Proceeds from the sale of property and equipment 10,692 305 481
Business acquisitions (94,630) (39,268)  
Proceeds from disposition of equipment centers   26,234  
Other 655 325 246
Net cash used in investing activities (231,826) (96,707) (49,758)
Cash flows from financing activities:      
Draws (payments) on floor plan notes payable, net 282,883 43,724 (93,446)
Proceeds from long-term debt 144,457 66,614 50,417
Principal payments on long-term debt (68,299) (55,575) (50,591)
Principal payments on capital lease obligations (14,048) (7,595) (4,693)
Proceeds from issuance of shares relating to employee stock options and employee stock purchases 5,518 2,281 827
Excess tax benefits (provision) from stock-based compensation 1,628 885 (191)
Debt issuance costs (145) (179) (176)
Net cash provided by (used in) financing activities 351,994 50,155 (97,853)
Net increase in cash and cash equivalents 38,799 19,881 2,684
Cash and cash equivalents, beginning of year 168,976 149,095 146,411
Cash and cash equivalents, end of year 207,775 168,976 149,095
Cash paid during the year for:      
Interest 15,237 13,264 14,298
Income taxes, net of refunds 2,032 7,544 2,392
Noncash investing and financing activities:      
Note receivable related to disposition of equipment centers   4,453  
Assets acquired under capital leases $ 17,400 $ 15,353 $ 24,317