OPERATING SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Jun. 16, 2014 segment	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
OPERATING SEGMENTS
Number of reportable segments	2
OPERATING SEGMENTS
Revenue		$ 170,894	$ 53,090	$ 290,272	$ 141,766
Direct operating costs		91,939	20,902	145,938	61,745
Transportation costs		26,292	10,568	44,282	24,091
Gross profit		52,663	21,620	100,052	55,930
Selling, general & administrative expenses		25,829	6,108	46,713	18,353
Operating income		26,834	15,512	53,339	37,577
Interest income (expense), net		(4,533)	(204)	(5,394)	(640)
Foreign currency gain (loss)		(830)	683	(1,027)	(1,448)
Other income		268	77	520	268
Income before income taxes		21,739	16,068	47,438	35,757
Income tax expense		8,406	5,740	17,880	12,813
Net income		13,333	10,328	29,558	22,944
Depreciation, amortization & accretion		13,333	4,397	23,681	12,811
Capital expenditures		9,226	3,060	17,910	15,590
Total assets		917,149	230,731	917,149	230,731	300,556
Treatment and disposal
OPERATING SEGMENTS
Revenue		80,207	42,495	173,461	117,569
Transportation and services
OPERATING SEGMENTS
Revenue		90,687	10,595	116,811	24,197
Operating Segment | Operating Disposal Facilities
OPERATING SEGMENTS
Revenue		59,744	53,084	164,581	141,750
Direct operating costs		23,095	20,847	67,951	61,583
Transportation costs		12,609	10,568	29,137	24,091
Gross profit		24,040	21,669	67,493	56,076
Selling, general & administrative expenses		2,972	2,611	8,488	8,524
Operating income		21,068	19,058	59,005	47,552
Interest income (expense), net		3	4	10	10
Foreign currency gain (loss)		410	(233)	396	199
Other income		124	75	355	261
Income before income taxes		21,605	18,904	59,766	48,022
Net income		21,605	18,904	59,766	48,022
Depreciation, amortization & accretion		4,510	4,336	13,470	12,628
Capital expenditures		2,551	2,915	10,102	15,330
Total assets		219,783	222,503	219,783	222,503
Operating Segment | Operating Disposal Facilities | Treatment and disposal
OPERATING SEGMENTS
Revenue		47,182	42,489	135,746	117,553
Operating Segment | Operating Disposal Facilities | Transportation and services
OPERATING SEGMENTS
Revenue		12,562	10,595	28,835	24,197
Operating Segment | Non-Operating Disposal Facilities
OPERATING SEGMENTS
Revenue		10	6	22	16
Direct operating costs		55	55	157	162
Gross profit		(45)	(49)	(135)	(146)
Operating income		(45)	(49)	(135)	(146)
Other income		2	2	7	7
Income before income taxes		(43)	(47)	(128)	(139)
Net income		(43)	(47)	(128)	(139)
Depreciation, amortization & accretion		49	52	146	156
Capital expenditures				43
Total assets		112	87	112	87
Operating Segment | Non-Operating Disposal Facilities | Treatment and disposal
OPERATING SEGMENTS
Revenue		10	6	22	16
Operating Segment | EQ Operations
OPERATING SEGMENTS
Revenue		111,326		125,895
Direct operating costs		68,975		78,055
Transportation costs		13,683		15,146
Gross profit		28,668		32,694
Selling, general & administrative expenses		18,214		20,660
Operating income		10,454		12,034
Interest income (expense), net		(84)		(136)
Other income		141		157
Income before income taxes		10,511		12,055
Net income		10,511		12,055
Depreciation, amortization & accretion		8,757		10,018
Capital expenditures		6,604		7,453
Total assets		672,153		672,153
Operating Segment | EQ Operations | Treatment and disposal
OPERATING SEGMENTS
Revenue		33,154		37,862
Operating Segment | EQ Operations | Transportation and services
OPERATING SEGMENTS
Revenue		78,172		88,033
Corporate
OPERATING SEGMENTS
Revenue		(186)		(226)
Direct operating costs		(186)		(225)
Transportation costs				(1)
Selling, general & administrative expenses		4,643	3,497	17,565	9,829
Operating income		(4,643)	(3,497)	(17,565)	(9,829)
Interest income (expense), net		(4,452)	(208)	(5,268)	(650)
Foreign currency gain (loss)		(1,240)	916	(1,423)	(1,647)
Other income		1		1
Income before income taxes		(10,334)	(2,789)	(24,255)	(12,126)
Income tax expense		8,406	5,740	17,880	12,813
Net income		(18,740)	(8,529)	(42,135)	(24,939)
Depreciation, amortization & accretion		17	9	47	27
Capital expenditures		71	145	312	260
Total assets		25,101	8,141	25,101	8,141
Corporate | Treatment and disposal
OPERATING SEGMENTS
Revenue		(139)		(169)
Corporate | Transportation and services
OPERATING SEGMENTS
Revenue		$ (47)		$ (57)