SEGMENT REPORTING (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 1,579,701	$ 1,602,170
Goodwill	449,577	570,960
Permits and other intangible, net	541,874	569,973
Total assets	3,761,217	3,953,678
Technical Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	412,008	400,544
Goodwill	50,336	45,599
Permits and other intangible, net	76,594	80,302
Total assets	758,294	699,675
Industrial and Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	252,159	251,826
Goodwill	108,514	109,873
Permits and other intangible, net	18,868	21,147
Total assets	409,807	410,233
Oil Re-refining and Recycling
Segment Reporting Information [Line Items]
Property, plant and equipment, net	204,468	211,458
Goodwill	51,152	171,161
Permits and other intangible, net	153,801	160,807
Total assets	545,213	642,901
SK Environmental Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	242,193	239,650
Goodwill	170,986	172,309
Permits and other intangible, net	256,171	265,106
Total assets	740,109	774,756
Lodging Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	143,493	166,252
Goodwill	33,717	35,512
Permits and other intangible, net	11,738	14,730
Total assets	223,565	239,056
Oil and Gas Field Services
Segment Reporting Information [Line Items]
Property, plant and equipment, net	223,822	224,585
Goodwill	34,872	36,506
Permits and other intangible, net	24,702	27,881
Total assets	377,607	381,057
Corporate Items
Segment Reporting Information [Line Items]
Property, plant and equipment, net	101,558	107,855
Goodwill	0	0
Permits and other intangible, net	0	0
Total assets	$ 706,622	$ 806,000