CLOSURE AND POST-CLOSURE OBLIGATIONS (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes to reported closure and post-closure obligations
Closure and post-closure obligations, beginning of period	$ 17,468,000	$ 17,362,000
Liabilities assumed in EQ acquisition	47,190,000
Accretion expense	2,656,000	1,241,000	1,367,000
Payments	(1,443,000)	(1,715,000)
Adjustments	7,157,000	760,000
Foreign Currency translation	(158,000)	(180,000)
Closure and post-closure obligations, end of year	72,870,000	17,468,000	17,362,000
Less current portion	(5,359,000)	(949,000)
Long-term portion	67,511,000	16,519,000
Changes to reported closure and post-closure asset, recorded as a component of Property and equipment, net
Net closure and post-closure asset, beginning of year	1,832,000	1,629,000
Asset acquired in EQ acquisition	16,555,000
Additions or adjustments to closure and post-closure asset	7,157,000	886,000
Amortization of closure and post-closure asset	(683,000)	(552,000)
Foreign currency translation	(210,000)	(131,000)
Net closure and post-closure asset, end of year	24,651,000	1,832,000	1,629,000
Environmental Services
Changes to reported closure and post-closure obligations
Adjustments	7,200,000	848,000
Field & Industrial Services
Changes to reported closure and post-closure obligations
Adjustments	$ (77,000)	$ (88,000)