SEGMENT REPORTING (Third Party Revenues to Direct Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 729,520	$ 893,366	$ 2,063,113	$ 2,562,093
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	729,520	893,366	2,063,113	2,562,093
Technical Services
Segment Reporting Information [Line Items]
Total revenues	232,482	253,069	680,717	741,419
Technical Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	38,795	34,819	109,217	108,037
Technical Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	492	506	1,547	2,886
Technical Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	271,769	288,394	791,481	852,342
Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues	162,118	307,226	437,546	807,423
Industrial and Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(12,734)	(6,973)	(29,255)	(24,764)
Industrial and Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	(32)	(313)	(335)	(636)
Industrial and Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	149,352	299,940	407,956	782,023
Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues	102,318	100,827	256,572	296,738
Kleen Performance Products | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(9,761)	(23,744)	(26,768)	(63,429)
Kleen Performance Products | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	0	(6)	(1)	(8)
Kleen Performance Products | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	92,557	77,077	229,803	233,301
SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues	194,764	171,832	565,186	508,392
SK Environmental Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	(18,955)	(5,947)	(59,561)	(26,331)
SK Environmental Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	1	2	369	5
SK Environmental Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	175,810	165,887	505,994	482,066
Lodging Services
Segment Reporting Information [Line Items]
Total revenues	15,520	13,507	47,583	68,782
Lodging Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	233	743	634	1,899
Lodging Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	19	30	54	127
Lodging Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	15,772	14,280	48,271	70,808
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues	22,197	46,788	73,445	138,992
Oil and Gas Field Services | Intersegment revenues, net
Segment Reporting Information [Line Items]
Total revenues	2,422	1,102	5,733	4,588
Oil and Gas Field Services | Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues	86	92	221	141
Oil and Gas Field Services | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	24,705	47,982	79,399	143,721
Corporate Items
Segment Reporting Information [Line Items]
Total revenues	121	117	2,064	347
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	(566)	(311)	(1,855)	(2,515)
Corporate Items | Direct revenues
Segment Reporting Information [Line Items]
Total revenues	$ (445)	$ (194)	$ 209	$ (2,168)