SEGMENT REPORTING (Third Party Reveunes to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 636,083	$ 732,499
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	636,083	732,499
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	636,083	732,499
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	219,105	240,325
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	34,844	34,904
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	388	1,297
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	254,337	276,526
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	121,577	146,868
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(7,466)	(6,561)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(17)	78
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	114,094	140,385
Kleen Performance Products | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	67,543	96,807
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,407)	(18,257)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(1)	(1)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	58,135	78,549
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	179,418	160,684
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(19,114)	(11,582)
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	367	0
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	160,671	149,102
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	15,645	34,104
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	264	164
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	21	17
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	15,930	34,285
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	32,016	53,587
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	879	1,332
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	87	9
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	32,982	54,928
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	779	124
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(845)	(1,400)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (66)	$ (1,276)