SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Disposal Cell Accounting
Period of acceptable financial assurance for closure and post-closure monitoring of each facility as per RCRA requirements	30 years
Deferred Financing Costs
Deferred financing costs, net of amortization	$ 12,900,000	$ 270,000
Derivative Instruments
Initial notional amount	250,000,000
Insurance
Accrued costs for self-insured health care coverage	$ 2,100,000	$ 493,000
Minimum
Intangible Assets
Estimated economic lives	1 year
Maximum
Intangible Assets
Estimated economic lives	45 years