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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Customer relations
Dec. 31, 2011
Customer relations
Sep. 30, 2012
Customer relations
Minimum
Sep. 30, 2012
Customer relations
Maximum
Sep. 30, 2012
Contractor relations
Dec. 31, 2011
Contractor relations
Sep. 30, 2012
Contractor relations
Minimum
Sep. 30, 2012
Contractor relations
Maximum
Sep. 30, 2012
Non-compete agreements
Dec. 31, 2011
Non-compete agreements
Sep. 30, 2012
Non-compete agreements
Minimum
Sep. 30, 2012
Non-compete agreements
Maximum
Intangible Assets [Line Items]                              
Estimated Useful Life           3 months 10 years     2 years 7 years     2 years 7 years
Intangible assets subject to amortization:                              
Gross Carrying Amount $ 144,062 $ 39,252   $ 103,223 $ 11,077     $ 37,864 $ 27,276     $ 2,975 $ 899    
Accumulated Amortization 40,263 34,094   12,316 7,891     27,023 25,599     924 604    
Net Carrying Amount 103,799 5,158   90,907 3,186     10,841 1,677     2,051 295    
Intangible assets not subject to amortization:                              
Trademarks, Carrying Amount 171,786 25,048                          
Goodwill, Carrying Amount 497,013 229,234 199,720                        
Total                              
Gross Carrying Amount 812,861 293,534                          
Net Carrying Amount $ 772,598 $ 259,440