SEGMENT REPORTING (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment operation	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Reporting segments number | segment									6
Number of operations for which the revenues are insignificant | operation									2
Total revenues	$ 713,044	$ 893,366	$ 936,228	$ 732,499	$ 845,024	$ 851,465	$ 858,480	$ 846,667	$ 3,275,137	$ 3,401,636	$ 3,509,656
Adjusted EBITDA, total									504,167	521,919	510,105
Reconciliation to Consolidated Statements of Income (Loss):
Pre-tax, non-cash acquisition accounting inventory adjustment									0	0	13,559
Accretion of environmental liabilities									10,402	10,612	11,541
Depreciation and amortization									274,194	276,083	264,449
Goodwill impairment charge									31,992	123,414	0
(Loss) income from operations	25,549	93,970	60,758	7,302	57,537	(42,748)	67,115	29,906	187,579	111,810	220,556
Other expense (income)	$ 990	$ 139	$ 660	$ (409)	$ (244)	$ (613)	$ 655	$ (4,178)	1,380	(4,380)	(1,705)
Loss on early extinguishment of debt											0
Interest expense, net of interest income									76,553	77,668	78,376
Income before provision for income taxes									109,646	38,522	143,885
Technical Services
Segment Reporting Information [Line Items]
Total revenues									1,139,080	1,205,383	1,147,815
Adjusted EBITDA, total									291,737	328,130	285,520
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									0	0
Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues									923,599	639,369	663,589
Adjusted EBITDA, total									157,500	87,591	96,804
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									0	0
Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues									306,825	331,723	335,627
Adjusted EBITDA, total									32,189	51,561	57,003
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									0	123,414
SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues									634,864	747,739	772,099
Adjusted EBITDA, total									140,073	113,986	112,722
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									0	0
Lodging Services
Segment Reporting Information [Line Items]
Total revenues									91,713	174,732	212,385
Adjusted EBITDA, total									16,478	61,438	80,358
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									0	0
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues									181,780	308,270	390,505
Adjusted EBITDA, total									(827)	40,114	67,855
Reconciliation to Consolidated Statements of Income (Loss):
Goodwill impairment charge									31,992	0
Corporate Items
Segment Reporting Information [Line Items]
Total revenues									(2,724)	(5,580)	(12,364)
Adjusted EBITDA, total									(132,983)	(160,901)	(190,157)
Third party revenues
Segment Reporting Information [Line Items]
Total revenues									3,275,137	3,401,636	3,509,656
Third party revenues | Technical Services
Segment Reporting Information [Line Items]
Total revenues									991,410	1,043,267	1,023,926
Third party revenues | Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues									957,337	681,779	708,523
Third party revenues | Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues									386,824	533,587	528,636
Third party revenues | SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues									674,102	667,320	665,008
Third party revenues | Lodging Services
Segment Reporting Information [Line Items]
Total revenues									89,060	172,218	208,545
Third party revenues | Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues									175,946	303,189	383,959
Third party revenues | Corporate Items
Segment Reporting Information [Line Items]
Total revenues									458	276	(8,941)
Intersegment revenues, net | Technical Services
Segment Reporting Information [Line Items]
Total revenues									144,084	156,543	120,382
Intersegment revenues, net | Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues									(32,982)	(42,681)	(44,717)
Intersegment revenues, net | Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues									(79,991)	(201,859)	(193,009)
Intersegment revenues, net | SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues									(39,241)	80,477	107,007
Intersegment revenues, net | Lodging Services
Segment Reporting Information [Line Items]
Total revenues									2,496	2,434	3,450
Intersegment revenues, net | Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues									5,634	5,086	6,887
Intersegment revenues, net | Corporate Items
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Corporate Items, net
Segment Reporting Information [Line Items]
Total revenues									0	0	0
Corporate Items, net | Technical Services
Segment Reporting Information [Line Items]
Total revenues									3,586	5,573	3,507
Corporate Items, net | Industrial and Field Services
Segment Reporting Information [Line Items]
Total revenues									(756)	271	(217)
Corporate Items, net | Kleen Performance Products
Segment Reporting Information [Line Items]
Total revenues									(8)	(5)	0
Corporate Items, net | SK Environmental Services
Segment Reporting Information [Line Items]
Total revenues									3	(58)	84
Corporate Items, net | Lodging Services
Segment Reporting Information [Line Items]
Total revenues									157	80	390
Corporate Items, net | Oil and Gas Field Services
Segment Reporting Information [Line Items]
Total revenues									200	(5)	(341)
Corporate Items, net | Corporate Items
Segment Reporting Information [Line Items]
Total revenues									$ (3,182)	$ (5,856)	$ (3,423)