v2.3.0.11
Business Combinations (Narrative) (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Number of acquisitions 7   20
Number of acquisitions, subsequent to the balance sheet date 4    
Total consideration for acquisitions $ (100,000,000)   $ (170,400,000)
Cash used in acquisitions, net of cash acquired (95,591,000) (13,742,000) (143,600,000)
Notes issued (1,550,000)   (5,530,000)
Other purchase price obligations, non-interest bearing (2,825,000)   (6,359,000)
Maximum payment under contingent consideration agreement 21,000,000    
Stock issued     (14,945,000)
Stock issued in business acquisitions, shares     689,655
Fair value adjustment 1,600,000    
Business acquisitions and adjustments to previously recorded goodwill 28,156,000   91,757,000
Goodwill expected to be deductible for income tax purposes 16,400,000   74,900,000
Revenue generated by acquisitions 53,400,000    
Operating income generated by acquisitions $ 1,900,000    
Wholesale Parts Business [Member]
      
Number of acquisitions 5   16
Number of acquisitions, subsequent to the balance sheet date 3    
Recycled Heavy-Duty Truck Products [Member]
      
Number of acquisitions 1   1
Tire Recycling Business [Member]
      
Number of acquisitions     1
Self Service Retail Operations [Member]
      
Number of acquisitions 1   2
Number of acquisitions, subsequent to the balance sheet date 1