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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

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