SEGMENT REPORTING (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total revenues	$ 713,044	$ 893,366	$ 936,228	$ 732,499	$ 845,024	$ 851,465	$ 858,480	$ 846,667	$ 3,275,137	$ 3,401,636	$ 3,509,656
Property, plant and equipment, net	1,532,467				1,558,834				1,532,467	1,558,834
Goodwill	453,105				452,669				453,105	452,669	570,960
Permits and other intangibles, net	506,818				530,080				506,818	530,080
Total intangible assets and goodwill	959,923				982,749				959,923	982,749
Assets	3,431,428				3,689,423				3,431,428	3,689,423	3,936,430
United States and Puerto Rico
Total revenues									$ 2,576,200	$ 2,414,600	$ 2,376,200
Segment reporting information revenue percent									78.70%	71.00%	67.70%
United States
Assets	$ 2,575,746				$ 2,557,639				$ 2,575,746	$ 2,557,639	$ 2,667,438
Canada
Total revenues									$ 695,000	$ 982,100	$ 1,125,000
Segment reporting information revenue percent									21.20%	28.90%	32.10%
Property plant and equipment net percent	29.30%				37.70%				29.30%	37.70%
Intangible assets net excluding goodwill percent	14.20%				17.80%				14.20%	17.80%
Property, plant and equipment, net	$ 449,300				$ 587,400				$ 449,300	$ 587,400
Permits and other intangibles, net	71,700				94,200				71,700	94,200
Assets	851,949				1,128,458				$ 851,949	$ 1,128,458	$ 1,266,505
Other foreign
Segment reporting information revenue percent									1.00%	1.00%	1.00%
Assets	3,733				3,326				$ 3,733	$ 3,326	$ 2,487
Technical Services
Total revenues									1,139,080	1,205,383	1,147,815
Property, plant and equipment, net	483,425				412,323				483,425	412,323
Goodwill	49,267				50,092				49,267	50,092	45,599
Permits and other intangibles, net	73,601				74,870				73,601	74,870
Total intangible assets and goodwill	122,868				124,962				122,868	124,962
Assets	800,060				756,169				800,060	756,169	699,675
Industrial and Field Services
Total revenues									923,599	639,369	663,589
Property, plant and equipment, net	237,660				245,115				237,660	245,115
Goodwill	105,286				109,214				105,286	109,214	109,873
Permits and other intangibles, net	14,649				17,801				14,649	17,801
Total intangible assets and goodwill	119,935				127,015				119,935	127,015
Assets	368,858				392,652				368,858	392,652	410,233
Kleen Performance Products
Total revenues									306,825	331,723	335,627
Property, plant and equipment, net	193,855				201,451				193,855	201,451
Goodwill	49,755				50,883				49,755	50,883	171,161
Permits and other intangibles, net	140,410				151,041				140,410	151,041
Total intangible assets and goodwill	190,165				201,924				190,165	201,924
Assets	492,483				538,921				492,483	538,921	642,901
SK Environmental Services
Total revenues									634,864	747,739	772,099
Property, plant and equipment, net	264,539				240,078				264,539	240,078
Goodwill	216,589				173,873				216,589	173,873	172,309
Permits and other intangibles, net	256,251				252,897				256,251	252,897
Total intangible assets and goodwill	472,840				426,770				472,840	426,770
Assets	805,488				731,072				805,488	731,072	774,756
Lodging Services
Total revenues									91,713	174,732	212,385
Property, plant and equipment, net	105,208				141,965				105,208	141,965
Goodwill	32,208				34,863				32,208	34,863	35,512
Permits and other intangibles, net	7,045				10,744				7,045	10,744
Total intangible assets and goodwill	39,253				45,607				39,253	45,607
Assets	181,357				231,782				181,357	231,782	239,056
Oil and Gas Field Services
Total revenues									181,780	308,270	390,505
Property, plant and equipment, net	156,286				215,574				156,286	215,574
Goodwill	0				33,744				0	33,744	36,506
Permits and other intangibles, net	14,862				22,727				14,862	22,727
Total intangible assets and goodwill	14,862				56,471				14,862	56,471
Assets	244,210				361,223				244,210	361,223	381,057
Corporate Items
Total revenues									(2,724)	(5,580)	(12,364)
Property, plant and equipment, net	91,494				102,328				91,494	102,328
Assets	$ 538,972				$ 677,604				$ 538,972	$ 677,604	$ 788,752