GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Changes in goodwill
Balance at the beginning of the period	$ 221,279,000
Foreign Currency Translation	(1,619,000)
Balance at the end of the period	219,660,000
Intangible Assets
Total amortizing intangible assets	237,800,000	240,905,000
Accumulated amortization	(14,987,000)	(12,135,000)
Total intangible assets, net	272,696,000	278,667,000
Permits and licenses
Intangible Assets
Nonamortizing intangible assets	49,750,000	49,750,000
Tradename
Intangible Assets
Nonamortizing intangible assets	133,000	147,000
Permits, licenses and lease
Intangible Assets
Total amortizing intangible assets	111,604,000	113,693,000
Customer relationships
Intangible Assets
Total amortizing intangible assets	102,783,000	103,086,000
Technology - formulae and processes
Intangible Assets
Total amortizing intangible assets	7,164,000	7,844,000
Customer backlog
Intangible Assets
Total amortizing intangible assets	4,600,000	4,600,000
Tradename
Intangible Assets
Total amortizing intangible assets	5,482,000	5,481,000
Developed software
Intangible Assets
Total amortizing intangible assets	3,718,000	3,745,000
Non-compete agreements
Intangible Assets
Total amortizing intangible assets	920,000	920,000
Internet domain and website
Intangible Assets
Total amortizing intangible assets	869,000	869,000
Database
Intangible Assets
Total amortizing intangible assets	660,000	667,000
Environmental Services
Changes in goodwill
Balance at the beginning of the period	154,855,000
Foreign Currency Translation	(1,619,000)
Balance at the end of the period	153,236,000
Field & Industrial Services
Changes in goodwill
Balance at the beginning of the period		66,424,000
Balance at the end of the period	66,424,000	66,424,000
EQ
Changes in goodwill
Balance at the beginning of the period		201,270,000
Balance at the end of the period	201,300,000	201,270,000
Intangible Assets
Intangible assets	252,900,000
EQ | Environmental Services
Changes in goodwill
Balance at the end of the period	134,900,000
EQ | Field & Industrial Services
Changes in goodwill
Balance at the end of the period	$ 66,400,000