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Commitments and Contingencies (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]    
Deferred rent liability, current $ 300,000 $ 300,000
Deferred rent liability, noncurrent 3,900,000 2,100,000
Long-term Debt    
2012 2,500,000  
2013 10,000,000  
2014 10,000,000  
2015 10,000,000  
2016 10,000,000  
Thereafter 396,588,000  
Total 439,088,000  
Operating Leases    
2012 3,489,000  
2013 12,024,000  
2014 9,790,000  
2015 8,010,000  
2016 5,216,000  
Thereafter 9,338,000  
Total 47,867,000  
Related Party    
2012 309,000  
2013 1,266,000  
2014 1,299,000  
2015 1,168,000  
2016 694,000  
Thereafter 175,000  
Total 4,911,000  
Total    
2012 6,298,000  
2013 23,290,000  
2014 21,089,000  
2015 19,178,000  
2016 15,910,000  
Thereafter 406,101,000  
Total 491,866,000  
Self insurance claim liability 10,600,000 10,400,000
Letters of credit outstanding, amount 2,600,000 2,400,000
Approximate potential future earn-out obligations $ 10,100,000  
Apex Systems
    
Business Acquisition [Line Items]    
Number of leased properties owned by related parties (in number of properties) 2