SEGMENT REPORTING (Adjusted EBITDA Information) (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]
Income (loss) from continuing operations	$ 165,607	$ 153,357	$ 407,006	$ 391,142
Accretion of environmental liabilities	2,577	2,642	7,795	7,975
Depreciation and amortization	69,060	70,049	205,189	205,480
Goodwill, Impairment Loss	0	(123,414)	(31,992)	(123,414)
Income (loss) from operations	93,970	(42,748)	162,030	54,273
Other expense (income)	139	(613)	390	(4,136)
Interest expense, net of interest income	19,017	19,494	57,704	58,430
Income (loss) before provision for income taxes	74,814	(61,629)	103,936	(21)
Technical Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	79,048	86,928	219,257	233,402
Industrial and Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	62,460	20,303	145,850	67,391
Kleen Performance Products
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	12,123	21,473	23,471	49,252
SK Environmental Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	40,096	30,853	108,540	84,985
Lodging Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,827	15,972	12,589	49,196
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	1,579	9,545	800	27,688
Goodwill, Impairment Loss			(31,992)
Corporate Items
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	$ (31,526)	$ (31,717)	$ (103,501)	$ (120,772)