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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Current provision (benefit)        
Federal $ 27,524 $ 24,791 $ 18,491  
State 7,125 5,697 4,663  
Foreign 67 621 1,081  
Total 34,716 31,109 24,235  
Deferred provision (benefit)        
Federal (451) 6,488 (1,951)  
State (366) 849 (189)  
Foreign (62) (122) (36)  
Total (879) 7,215 (2,176)  
Change in valuation allowance   150    
Total 33,837 38,174 22,059  
Reconciliation of income tax expense compared to the amount of income tax expense that would result by applying U.S. federal statutory income tax rate to pre-tax income        
U.S. federal statutory income tax rate (as a percent) 35.00% 35.00% 35.00%  
State taxes, net of federal income tax impact (as a percent) 4.87% 4.33% 4.52%  
Foreign tax credit (as a percent) (0.01%) (0.52%) (1.88%)  
Canadian income tax (as a percent) 0.01% 0.52% 1.88%  
Domestic production activities deduction (as a percent) (2.97%) (2.79%) (3.30%)  
Other items (as a percent) 0.45% 2.92% 3.40%  
Effective tax rate on income before provision for income taxes excluding income attributable to noncontrolling interests (as a percent) 37.35% 39.46% 39.62%  
Impact of income from noncontrolling interests on effective tax rate (as a percent) (0.61%)      
Effective tax rate on income before provision for income taxes and noncontrolling interests (as a percent) 36.74% 39.46% 39.62%  
Deferred tax assets:        
Accrued workers compensation 4,973 4,023    
Insurance reserves 1,114 2,657    
Other accrued liabilities 10,434 6,604    
State income taxes 1,537 1,605    
Capital loss carryforward 344 344    
Foreign tax credit 662 644    
Valuation allowance (344) (344)   (344)
Total deferred tax assets 18,720 15,533    
Deferred tax liabilities        
Depreciation and amortization (26,661) (24,659)    
Prepaid expenses and other (1,600) (1,294)    
Total deferred tax liabilities (28,261) (25,953)    
Total $ (9,541) $ (10,420)    
Minimum period of statute of limitations of state and foreign jurisdictions 3 years      
Maximum period of statute of limitations of state and foreign jurisdictions 5 years