SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Safety-Kleen
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowance, deferred tax asset, change in amount			$ 13,800,000
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance beginning of period	7,354,000	1,246,000	1,830,000
Additions (deductions) charged	8,917,000	7,933,000	1,213,000
Changes to Reserves	2,795,000	1,825,000	1,797,000
Balance end of period	13,476,000	7,354,000	1,246,000
Revenue Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance beginning of period	10,752,000	9,879,000	10,853,000
Additions (deductions) charged	20,237,000	16,401,000	18,847,000
Changes to Reserves	18,804,000	15,528,000	19,821,000
Balance end of period	12,185,000	10,752,000	9,879,000
Valuation Allowance on Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance beginning of period	29,726,000	26,325,000	11,473,000
Additions (deductions) charged	(1,812,000)	(1,545,000)	(196,000)
Changes to Reserves	1,147,000	4,946,000	15,048,000
Balance end of period	$ 29,061,000	$ 29,726,000	$ 26,325,000