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Revolving Credit Facility (Details Textual) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Revolving Credit Facility [Member]
Jun. 30, 2013
Letter of Credit [Member]
Jun. 14, 2013
Letter of Credit [Member]
Self-Insured States [Member]
Jun. 30, 2013
September 30, 2014 [Member]
Jun. 30, 2013
September 30, 2015 [Member]
Jun. 30, 2013
Thereafter [Member]
Jun. 30, 2013
Maximum [Member]
Revolving Credit Facility [Member]
Jun. 30, 2013
Maximum [Member]
September 30, 2013 [Member]
Jun. 30, 2013
Minimum [Member]
Revolving Credit Facility (Textual) [Abstract]                      
Outstanding borrowings on the revolving credit facility     $ 0                
Revolving credit facility current borrowing capacity                 21,500,000    
Interest calculation under revolving credit facility     the rate is calculated based on LIBOR plus 1.75%.                
Interest rate under revolving credit facility     0.25%                
Minimum fixed charge coverage ratio                     1.25
LIBOR plus rate     1.75%                
Funded debt to EBITDA ratio           1.75 1.5 1.25   2.25  
Letters of credit outstanding amount         70,600,000            
Letter of credit facility increase amount       46,700,000              
Revolving Credit Facility (Additional Textual) [Abstract]                      
Line of credit facility expiration date Oct. 01, 2017                    
Revolving credit facility borrowing capacity 24,000,000                    
Letters of credit outstanding amount 70,600,000                    
Restricted certificates of deposit related to California workers' compensation 63,944,000 0                  
Interest calculation under revolving credit facility The Agreement also provides for an unused commitment fee of 0.25% per annum on the average daily unused amount of the revolving credit facility                    
Reduction in maximum borrowing capacity 2,500,000                    
Ratio of restricted and unrestricted cash and marketable securities to workers' compensation and safety incentive liabilities 1.0                    
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing $ 200,000