COMMITMENTS AND CONTINGENCIES (Details) CAD in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2010 customer	Jun. 30, 2015 USD ($) Proceedings sites facilties claims	Dec. 31, 2012 CAD	Dec. 31, 2002 a	Dec. 31, 1999 Municipalities	Dec. 31, 1968 Permits	Dec. 31, 2014 USD ($)
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $		$ 30,600,000					$ 33,600,000
Accrued remedial liabilities | $		$ 148,777,000					155,121,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products | Proceedings		52
Number of product liability claims settled or dismissed | claims		24
Number of customers filing a complaint | customer	2
Legal and Administrative Proceedings
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $		$ 24,400,000					27,700,000
Possible increase in legal and administrative proceedings | $		2,500,000					2,900,000
Ville Mercier
Contingencies [Line Items]
Number of permits issued by government, for dumping organic liquid | Permits						2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec | Municipalities					3
General damages sought | CAD			CAD 2.9
Punitive damages sought | CAD			CAD 10.0
Accrued remedial liabilities | $		$ 11,900,000					12,700,000
Superfund Proceedings
Contingencies [Line Items]
Number of sites owned by third party excluded from cleanup or related liabilities		128
Number of sites owned by the entity subject to proceedings under federal or state superfund laws | facilties		2
Notices received from owners of third party sites seeking indemnification from the company		126
Number of sites for which environmental remediation expense is settled		29
Third party sites requiring expenditure on remediation		22
Number of sites not currently requiring expenditures on remediation		75
Number of sites which potential liability could exceed $100,000		11
Notices received from owners of third party sites seeking indemnification from the company		6
Wichita Property
Contingencies [Line Items]
State-designated superfund site acquired, total acres | a				1,400
Certain Other Third Party Sites
Contingencies [Line Items]
Indemnification agreement with third party sites		11
Safety-Kleen
Contingencies [Line Items]
Notices received from owners of third party sites seeking indemnification from the company		17
Federal and State Enforcement Actions
Contingencies [Line Items]
Recorded reserves for actual or probable liabilities | $		$ 6,200,000					5,900,000
Number of pending personal injury claims allegedly resulting from the used of Safety-Kleen's products | Proceedings		4
Minimum potential liability | $		$ 100,000					$ 100,000