BUSINESS COMBINATION (Details) (USD $)	0 Months Ended	3 Months Ended		12 Months Ended
	Jun. 17, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jun. 17, 2014
Consideration paid and the fair value of assets acquired and liabilities assumed
Goodwill		$ 219,660,000		$ 221,279,000
Field & Industrial Services
Consideration paid and the fair value of assets acquired and liabilities assumed
Goodwill		66,424,000		66,424,000
Environmental Services
Consideration paid and the fair value of assets acquired and liabilities assumed
Goodwill		153,236,000		154,855,000
EQ
BUSINESS ACQUISITIONS
Percentage of outstanding shares acquired	100.00%				100.00%
Payment to acquire business, net of cash acquired	460,900,000
Amount of term loan which was used to funded acquisition	415,000,000				415,000,000
Consideration paid and the fair value of assets acquired and liabilities assumed
Current assets				112,276,000
Property and equipment				101,543,000
Identifiable intangible assets				252,874,000
Current liabilities				(58,312,000)
Other liabilities				(143,005,000)
Total identifiable net assets				265,376,000
Goodwill		201,300,000		201,270,000
Total purchase price				466,646,000
Additional information
Revenue since acquisition included in consolidated statements of operations		84,600,000
Operating income (loss) since acquisition included in consolidated statements of operations		3,500,000
Acquisition-related costs included in selling, general and administrative expenses		782,000
Pro forma combined:
Revenue			138,075,000
Net income			6,856,000
Earnings per share - Basic (in dollars per share)			$ 0.32
Earnings per share - Diluted (in dollars per share)			$ 0.32
EQ | Field & Industrial Services
Consideration paid and the fair value of assets acquired and liabilities assumed
Goodwill		66,400,000
EQ | Environmental Services
Consideration paid and the fair value of assets acquired and liabilities assumed
Goodwill		134,900,000
EQ | Permits and licenses
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	49,000,000				49,000,000
Previously Reported | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Current assets				111,982,000
Property and equipment				101,543,000
Identifiable intangible assets				252,874,000
Current liabilities				(57,585,000)
Other liabilities				(139,331,000)
Total identifiable net assets				269,483,000
Goodwill				197,163,000
Total purchase price				466,646,000
Adjustments | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Current assets				294,000
Current liabilities				(727,000)
Other liabilities				(3,674,000)
Total identifiable net assets				(4,107,000)
Goodwill				4,107,000
Customer relationships | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	98,400,000				98,400,000
Additional information
Weighted average amortization period	15 years
Permits and licenses | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	89,600,000				89,600,000
Additional information
Weighted average amortization period	45 years
Tradename | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	5,481,000				5,481,000
Additional information
Weighted average amortization period	3 years
Customer backlog | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	4,600,000				4,600,000
Additional information
Weighted average amortization period	10 years
Developed software | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	3,443,000				3,443,000
Additional information
Weighted average amortization period	9 years
Non-compete agreements | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	900,000				900,000
Additional information
Weighted average amortization period	1 year
Internet domain and website | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	869,000				869,000
Additional information
Weighted average amortization period	19 years
Database | EQ
Consideration paid and the fair value of assets acquired and liabilities assumed
Identifiable intangible assets	$ 581,000				$ 581,000
Additional information
Weighted average amortization period	15 years