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Workers' Compensation Claims (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Jul. 01, 2013
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Worker's Compensation Claims (Textual) [Abstract]          
Estimated future liability for unsettled workers' compensation $ 70,564,000   $ 51,193,000 $ 39,302,000 $ 35,958,000
Receivable from insurer for insured claims liability 757,000   1,900,000    
Long-term workers' compensation claims liabilities 390,000        
Aggregate undiscounted pay-out amount 523,000        
Specified investment balances 26,100,000   9,000,000    
Standby letters of credit and a surety bond 23,800,000        
Annual fee paid 0   292,000 209,000  
Increasing Company's surety deposit requirement   17,200,000      
Maryland [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance retention 1,000,000        
Colorado [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance retention 500,000        
Self-Insured States [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance retention 5,000,000        
Maximum [Member]
          
Worker's Compensation Claims [Line Items]          
Discount rates applied to discounted liabilities 9.00%        
Pay-out periods to the beneficiaries 32 years        
Minimum [Member]
          
Worker's Compensation Claims [Line Items]          
Discount rates applied to discounted liabilities 4.25%        
Pay-out periods to the beneficiaries 7 years        
ACE [Member] | Maximum [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance coverage with Chartis 15,000,000        
ACE [Member] | Maximum [Member] | Maryland [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance coverage with Chartis 25,000,000        
ACE [Member] | Maximum [Member] | Colorado [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers compensation insurance coverage with Chartis maximum limit Statutory Limit        
ACE [Member] | Minimum [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance coverage with Chartis 5,000,000        
ACE [Member] | Minimum [Member] | Maryland [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance coverage with Chartis 1,000,000        
ACE [Member] | Minimum [Member] | Colorado [Member]
          
Worker's Compensation Claims [Line Items]          
Excess workers' compensation insurance coverage with Chartis $ 500,000