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Long-Term Debt Obligations (Details) (USD $)
 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Revolving credit facility
item
Sep. 23, 2011
Revolving credit facility
Sep. 30, 2012
Revolving credit facility
Actual
Sep. 30, 2012
Revolving credit facility
Minimum
Sep. 30, 2012
Revolving credit facility
Minimum
Covenant Requirement
Sep. 30, 2012
Revolving credit facility
Maximum
Sep. 30, 2012
Revolving credit facility
Maximum
Covenant Requirement
Through December 31, 2013
Sep. 30, 2012
Revolving credit facility
Maximum
Covenant Requirement
Through June 30, 2014
Sep. 30, 2012
Revolving credit facility
Maximum
Covenant Requirement
Through maturity
Sep. 30, 2012
Revolving credit facility
Base rate
Adjusted EBITDA ratio, Less than 0.75
Sep. 30, 2012
Revolving credit facility
Base rate
Adjusted EBITDA ratio, 0.75 to 1.25
Sep. 30, 2012
Revolving credit facility
Base rate
Adjusted EBITDA ratio, 1.25 to 2.00
Sep. 30, 2012
Revolving credit facility
Base rate
Adjusted EBITDA ratio, 2.00 to 2.50
Sep. 30, 2012
Revolving credit facility
Base rate
Adjusted EBITDA ratio, 2.50 or greater
Sep. 30, 2012
Revolving credit facility
Eurodollar rate
Adjusted EBITDA ratio, Less than 0.75
Sep. 30, 2012
Revolving credit facility
Eurodollar rate
Adjusted EBITDA ratio, 0.75 to 1.25
Sep. 30, 2012
Revolving credit facility
Eurodollar rate
Adjusted EBITDA ratio, 1.25 to 2.00
Sep. 30, 2012
Revolving credit facility
Eurodollar rate
Adjusted EBITDA ratio, 2.00 to 2.50
Sep. 30, 2012
Revolving credit facility
Eurodollar rate
Adjusted EBITDA ratio, 2.50 or greater
Sep. 30, 2012
Other debt
Dec. 31, 2011
Other debt
Sep. 30, 2012
Notes to former owners
Dec. 31, 2011
Notes to former owners
Long-Term Debt Obligations                                                  
Total debt $ 24,349,000 $ 15,381,000 $ 14,000,000                                     $ 2,400,000 $ 2,700,000 $ 7,949,000 $ 12,681,000
Less - current portion (300,000) (632,000)                                              
Total long-term portion of debt 24,049,000 14,749,000                                              
Borrowing capacity       125,000,000                                          
Outstanding borrowings     14,000,000                                            
Letter of credit amount outstanding     45,200,000                                            
Credit available     65,800,000                                            
Number of interest rate options     2                                            
Additional per annum interest margin added under:                                                  
Variable rate basis                       Base rate Base rate Base rate Base rate Base rate Eurodollar rate Eurodollar rate Eurodollar rate Eurodollar rate Eurodollar rate        
Additional per annum interest margin (as a percent)                       0.75% 1.00% 1.25% 1.50% 1.75% 1.75% 2.00% 2.25% 2.50% 2.75%        
Letter of credit fees (as a percent)           1.30%   2.10%                                  
Commitment fees payable on unused portion of the facility (as a percent)           0.25%   0.50%                                  
Number of quarters used as basis for calculation of net earning per terms of the financial covenants     4                                            
Principal financial covenants                                                  
Leverage ratio         0.52       3.00 2.75 2.50                            
Fixed charge coverage ratio         15.94   2.00                                    
Net leverage ratio used to determine exclusion of stock repurchases and the payment of dividends for calculation of the fixed charge coverage ratio                 2.00 1.50 1.00                            
Number of quarters of capital expenditures, tax provision, dividends and stock repurchase payments used for calculation of fixed charge coverage ratio     4                                            
Permitted amount of acquisitions per transaction     15,000,000                                            
Period prior to acquisition for which aggregate purchase price is considered for determining permitted amount of acquisitions per transaction     12 months                                            
Aggregate purchase price of current acquisition and acquisitions in the preceding 12 month period for determining permitted amount of acquisition per transaction               $ 30,000,000                                  
Net leverage ratio used as basis for other restrictions             2.00                                    
Other disclosures                                                  
Weighted average interest rate (as a percent)     2.00%                                     0.34%   3.30%