SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 697,510	$ 936,228	$ 1,333,593	$ 1,668,727
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	697,510	936,228	1,333,593	1,668,727
Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Direct revenues
Segment Reporting Information [Line Items]
Total revenues	697,510	936,228	1,333,593	1,668,727
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	229,130	248,025	448,235	488,350
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	35,578	38,314	70,422	73,218
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	667	1,083	1,055	2,380
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	265,375	287,422	519,712	563,948
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	153,851	353,329	275,428	500,197
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,055)	(11,230)	(16,521)	(17,791)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(286)	(401)	(303)	(323)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	144,510	341,698	258,604	482,083
Kleen Performance Products | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	86,711	99,104	154,254	195,911
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(7,600)	(21,428)	(17,007)	(39,685)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	(1)	(1)	(2)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	79,111	77,675	137,246	156,224
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	191,004	175,876	370,422	336,560
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(21,492)	(8,802)	(40,606)	(20,384)
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	1	3	368	3
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	169,513	167,077	330,184	316,179
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	16,418	21,171	32,063	55,275
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	137	992	401	1,156
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	14	80	35	97
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	16,569	22,243	32,499	56,528
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	19,232	38,617	51,248	92,204
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	2,432	2,154	3,311	3,486
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	48	40	135	49
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	21,712	40,811	54,694	95,739
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	1,164	106	1,943	230
Corporate Items | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	0	0	0	0
Corporate Items | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(444)	(804)	(1,289)	(2,204)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ 720	$ (698)	$ 654	$ (1,974)