COMMITMENTS AND CONTINGENCIES (Legal and Administrative Proceedings) (Details)						12 Months Ended							1 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Legal and administrative proceedings USD ($)	Dec. 31, 2013 Legal and administrative proceedings USD ($)	Dec. 31, 2012 Ville Mercier CAD	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Dec. 31, 2014 Ville Mercier USD ($)	Dec. 31, 2013 Ville Mercier USD ($)	Dec. 31, 2014 Federal and State enforcement actions USD ($) Proceedings	Dec. 31, 2013 Federal and State enforcement actions USD ($) Proceedings	Oct. 31, 2010 Safety-Kleen customer	Dec. 31, 2014 Safety-Kleen claims Proceedings
Legal and Administrative Proceedings
Loss contingency accrual, at carrying value	$ 33,600,000	$ 41,700,000		$ 27,700,000	$ 34,600,000
Possible increase in legal and administrative proceedings				2,900,000	3,500,000
Reserves relating to legal and administrative proceedings											5,900,000	7,100,000
Number of permits issued by government, for dumping organic liquid								2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec							3
General damages sought						2,900,000
Punitive damages sought						10,000,000
Accrued remedial liabilities	$ 155,121,000	$ 172,498,000	$ 183,346,000	$ 27,700,000					$ 12,700,000	$ 13,600,000
Loss contingency, claims settled and dismissed, number														17
Number of proceedings											4	5		59
Number of customers filing a complaint													2