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Business Combinations (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisition [Line Items]      
Aggregate purchase price of acquisitions $ 214,822,000 $ 186,783,000  
Cash payments for acquisitions 167,444,000 158,636,000  
Note payable 1,194,000 759,000  
Assumption of liabilities 15,659,000 2,298,000  
Total goodwill 128,344,000 116,393,000  
Recorded earn-out payable 30,525,000 25,090,000  
Goodwill acquired, deductible for income tax 84,105,000 91,303,000  
Goodwill not-deductible for income tax purposes 13,714,000    
Goodwill assigned 128,344,000 116,393,000  
Total revenues related to acquisitions 40,291,000 30,172,000  
Income before income taxes related to acquisitions 7,223,000 3,255,000  
Additional net consideration paid 4,190,000    
Additional consideration paid in cash 3,781,000 975,000  
Issuance of notes payable 409,000 3,062,000  
Maximum future contingency payments related to acquisitions   132,516,000  
Estimated acquisition earn-out payables 47,715,000 29,609,000  
Recognition rate of the fair values of acquired assets, including goodwill, and assumed liabilities 100.00%    
Change in fair value on estimated acquisition earn-out payables (4,043,000) (2,606,000)   
Interest expense accretion 1,837,000 932,000 128,000
Purchased Customer Accounts [Member]
      
Business Acquisition [Line Items]      
Weighted average life (in years) 15.0 15.0  
Non-Compete Agreements [Member]
      
Business Acquisition [Line Items]      
Weighted average life (in years) 5.0 5.0  
Retail [Member]
      
Business Acquisition [Line Items]      
Goodwill assigned 108,420,000 57,423,000  
National Programs [Member]
      
Business Acquisition [Line Items]      
Goodwill assigned 11,853,000    
Services [Member]
      
Business Acquisition [Line Items]      
Goodwill assigned 8,071,000 58,970,000  
Prior [Member]
      
Business Acquisition [Line Items]      
Additional net consideration paid 4,190,000 4,037,000  
Maximum future contingency payments related to acquisitions   5,098,000  
Subsequent [Member]
      
Business Acquisition [Line Items]      
Maximum future contingency payments related to acquisitions   127,418,000  
Asset Acquisitions [Member]
      
Business Acquisition [Line Items]      
Number of acquisitions 37 33  
Current Liability [Member]
      
Business Acquisition [Line Items]      
Estimated acquisition earn-out payables 3,654,000 7,651,000  
Non-Current Liability [Member]
      
Business Acquisition [Line Items]      
Estimated acquisition earn-out payables $ 44,061,000 $ 21,958,000  
Minimum [Member]
      
Business Acquisition [Line Items]      
Operating profit period (in years) 1 1  
Maximum [Member]
      
Business Acquisition [Line Items]      
Operating profit period (in years) 3 3