SEGMENT REPORTING (Third Party Reveunes to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 893,366	$ 851,465	$ 2,562,093	$ 2,556,612
Third party revenues
Segment Reporting Information [Line Items]
Total revenues	893,366	851,465	2,562,093	2,556,612
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	893,366	851,465	2,562,093	2,556,612
Technical Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	253,069	272,478	741,419	766,057
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	34,819	39,296	108,037	116,812
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	506	1,628	2,886	2,805
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	288,394	313,402	852,342	885,674
Industrial and Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	307,226	163,582	807,423	510,696
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(6,973)	(9,234)	(24,764)	(32,039)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(313)	29	(636)	220
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	299,940	154,377	782,023	478,877
Kleen Performance Products | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	100,827	140,345	296,738	413,282
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(23,744)	(52,606)	(63,429)	(155,583)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(6)	0	(8)	(5)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	77,077	87,739	233,301	257,694
SK Environmental Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	171,832	170,980	508,392	503,692
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(5,947)	21,212	(26,331)	64,476
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	2	0	5	(58)
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	165,887	192,192	482,066	568,110
Lodging Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	13,507	36,582	68,782	136,148
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	743	697	1,899	1,991
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	30	26	127	52
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	14,280	37,305	70,808	138,191
Oil and Gas Field Services | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	46,788	67,370	138,992	226,319
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	1,102	635	4,588	4,343
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	92	4	141	(6)
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	47,982	68,009	143,721	230,656
Corporate Items | Third party revenues
Segment Reporting Information [Line Items]
Total revenues	117	128	347	418
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	(311)	(1,687)	(2,515)	(3,008)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (194)	$ (1,559)	$ (2,168)	$ (2,590)