SEGMENT REPORTING (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 28, 2012
Total revenues	$ 845,024	$ 851,465	$ 858,480	$ 846,667	$ 879,430	$ 907,535	$ 860,528	$ 862,163	$ 3,401,636	$ 3,509,656	$ 2,187,908
Property, plant and equipment, net	1,558,834				1,602,170				1,558,834	1,602,170
Permits and other intangibles, net	530,080				569,973				530,080	569,973
Goodwill	452,669				570,960				452,669	570,960	579,715
Total intangible assets and goodwill	982,749				1,140,933				982,749	1,140,933
Total assets	3,704,278				3,953,678				3,704,278	3,953,678
United States and Puerto Rico
Total revenues									2,414,600	2,376,200	1,254,200
Segment reporting information revenue percent									71.00%	67.70%	57.30%
United States
Total assets	2,572,494				2,684,686				2,572,494	2,684,686
Canada
Total revenues									982,100	1,125,000	933,000
Segment reporting information revenue percent									28.90%	32.10%	42.60%
Property, plant and equipment, net	587,400				652,000				587,400	652,000
Permits and other intangibles, net	94,200				110,800				94,200	110,800
Property plant and equipment net percent	37.70%				40.70%				37.70%	40.70%
Intangible assets net excluding goodwill percent	17.80%				19.40%				17.80%	19.40%
Total assets	1,128,458				1,266,505				1,128,458	1,266,505
Other foreign
Segment reporting information revenue percent									1.00%	1.00%	1.00%
Total assets	3,326				2,487				3,326	2,487
Technical Services
Total revenues									1,205,383	1,147,815	991,696
Property, plant and equipment, net	412,323				400,544				412,323	400,544
Permits and other intangibles, net	74,870				80,302				74,870	80,302
Goodwill	50,092				45,599				50,092	45,599
Total intangible assets and goodwill	124,962				125,901				124,962	125,901
Total assets	756,169				699,675				756,169	699,675
Industrial and Field Services
Total revenues									639,369	663,589	590,458
Property, plant and equipment, net	245,115				251,826				245,115	251,826
Permits and other intangibles, net	17,801				21,147				17,801	21,147
Goodwill	109,214				109,873				109,214	109,873		75,400
Total intangible assets and goodwill	127,015				131,020				127,015	131,020
Total assets	392,652				410,233				392,652	410,233
Oil Re-refining and Recycling
Total revenues									331,723	335,627	0
Property, plant and equipment, net	201,451				211,458				201,451	211,458
Permits and other intangibles, net	151,041				160,807				151,041	160,807
Goodwill	50,883				171,161				50,883	171,161		173,200
Total intangible assets and goodwill	201,924				331,968				201,924	331,968
Total assets	538,921				642,901				538,921	642,901
SK Environmental Services
Total revenues									747,739	772,099	0
Property, plant and equipment, net	240,078				239,650				240,078	239,650
Permits and other intangibles, net	252,897				265,106				252,897	265,106
Goodwill	173,873				172,309				173,873	172,309		174,100
Total intangible assets and goodwill	426,770				437,415				426,770	437,415
Total assets	731,072				774,756				731,072	774,756
Lodging Services
Total revenues									174,732	212,385	202,533
Property, plant and equipment, net	141,965				166,252				141,965	166,252
Permits and other intangibles, net	10,744				14,730				10,744	14,730
Goodwill	34,863				35,512				34,863	35,512
Total intangible assets and goodwill	45,607				50,242				45,607	50,242
Total assets	231,782				239,056				231,782	239,056
Oil and Gas Field Services
Total revenues									308,270	390,505	403,615
Property, plant and equipment, net	215,574				224,585				215,574	224,585
Permits and other intangibles, net	22,727				27,881				22,727	27,881
Goodwill	33,744				36,506				33,744	36,506
Total intangible assets and goodwill	56,471				64,387				56,471	64,387
Total assets	361,223				381,057				361,223	381,057
Corporate Items
Total revenues									(5,580)	(12,364)	(394)
Property, plant and equipment, net	102,328				107,855				102,328	107,855
Total assets	692,459				806,000				692,459	806,000
Third party revenues
Total revenues									3,401,636	3,509,656	2,187,908
Third party revenues | Technical Services
Total revenues									1,043,267	1,023,926	957,764
Third party revenues | Industrial and Field Services
Total revenues									681,779	708,523	634,254
Third party revenues | Oil Re-refining and Recycling
Total revenues									533,587	528,636	0
Third party revenues | SK Environmental Services
Total revenues									667,320	665,008	0
Third party revenues | Lodging Services
Total revenues									172,218	208,545	199,497
Third party revenues | Oil and Gas Field Services
Total revenues									303,189	383,959	394,917
Third party revenues | Corporate Items
Total revenues									$ 276	$ (8,941)	$ 1,476