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, 2013
Installments
Sep. 30, 2013
Installments
Earn-Out Amount [Abstract]    
Maximum earn out amount $ 4,552,000 $ 4,552,000
Earn out amount paid 3,896,000 3,896,000
Earn out amount paid in cash 2,574,000 2,574,000
Earn out amount paid in promissory note 1,322,000 1,322,000
Number of monthly installments 36 36
Periodic payment   40,000
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   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 38,161,000 38,161,000
Sinking fund related to the insurance policy 15,403,000 15,403,000
Interest earned on sinking fund 931,000 931,000
Interest income on sinking fund during the period 7,000 20,000
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%
Contract termination election minimum period   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 5,896,000 5,896,000
Interest earned on sinking fund under second insurance policy 196,000 196,000
Interest income on sinking fund during the period under second insurance policy 2,000 7,000
Period of finite second insurance policy   4 years
Renewal fee for additional year under second insurance policy   $ 46,000