Quarterly report pursuant to sections 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Jun. 30, 2012
Sep. 28, 2010
Earn-Out Amount [Abstract]        
Maximum earn out amount $ 4,552,000 $ 4,552,000    
Earn out amount paid     3,896,000  
Earn out amount paid in cash     2,574,000  
Earn out amount paid in promissory note       1,322,000
Offset amount representing indemnification obligation 656,000 656,000    
Maximum offset amount relating to merger agreement 1,000,000 1,000,000    
Offset amount relating to excise tax issue and refund request 93,000 93,000    
Anticipated offset amount relating to nonconforming waste 563,000 563,000    
Insurance [Abstract]        
Period of finite risk insurance policy (in years)   25 years    
Maximum allowable coverage of insurance policy 39,000,000 39,000,000    
Final payment to insurer   18,305,000    
Final payment to insurer deposited in sinking fund account 14,472,000 14,472,000    
Final payment to insurer representing terrorism premium   2,883,000    
Final payment to insurer representing fee payable   950,000    
Financial assurance coverage amount under insurance policy 37,524,000 37,524,000    
Sinking fund related to the insurance policy 15,375,000 15,375,000    
Interest earned on sinking fund 904,000 904,000    
Interest income on sinking fund during the period 7,000 23,000    
Insurer's obligation to entity on termination of contract (in hundredths) 100.00% 100.00%    
Financial assurance coverage amount under second insurance policy 7,800,000 7,800,000    
Annual growth rate of financial assurance coverage amount under second insurance policy (in hundredths)   1.50%    
Period of finite second insurance policy (in years)   4 years    
Maximum financial assurance coverage amount under second insurance policy 8,200,000 8,200,000    
Total payment under second policy 7,158,000 7,158,000    
Amount of annual payment deposited in sinking fund under second insurance policy   5,700,000    
Initial payment representing premium under second insurance policy 1,458,000 1,458,000    
Sinking fund related to the second insurance policy 5,887,000 5,887,000    
Interest earned on sinking fund under second insurance policy 187,000 187,000    
Interest income on sinking fund during the period under second insurance policy 3,000 6,000    
Renewal fee for additional year under second insurance policy   46,000    
First Installment [Member]
        
Insurance [Abstract]        
Final payment to insurer   1,073,000    
Second Installment [Member]
        
Insurance [Abstract]        
Final payment to insurer   $ 1,054,000