STOCKHOLDERS' EQUITY (Details) (USD $)	0 Months Ended	12 Months Ended
	Dec. 03, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 09, 2012	Jun. 07, 2012
Stock Issued During Period, Per Share Value, New Issues	$ 56.00
Issuance of acquisition-related common stock, net		$ 0	$ 0	$ 1,015,000
Common stock, authorized shares		80,000,000	80,000,000		80,000,000	40,000,000
Safety-Kleen [Member]
Stock Issued During Period, Shares, Acquisitions	6,900,000	6,900,000
Stock Issued During Period, Value, Other		900,000
Issuance of acquisition-related common stock, net		$ 369,500,000