Schedule II (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	$ 1,830,000		$ 2,084,000		$ 832,000
Adduttuibs (Deductions) Charged	1,213,000		759,000		1,245,000
Changes to Reserves	1,797,000	[1]	1,013,000	[1]	(7,000)	[1]
Balance End of Period	1,246,000		1,830,000		2,084,000
Allowance for Sales Returns [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	10,853,000	[2]	21,620,000	[2]	7,423,000	[2]
Adduttuibs (Deductions) Charged	18,847,000	[2]	13,846,000	[2]	29,497,000	[2]
Changes to Reserves	19,821,000	[2]	24,613,000	[2]	15,300,000	[2]
Balance End of Period	9,879,000	[2]	10,853,000	[2]	21,620,000	[2]
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance Beginning of Period	11,473,000		12,919,000		11,242,000
Adduttuibs (Deductions) Charged	(196,000)		(1,593,000)		1,677,000
Changes to Reserves	14,358,000		147,000		0
Balance End of Period	25,635,000		11,473,000		12,919,000
Safety-Kleen [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 12,500,000

[1] Amounts deemed uncollectible, net of recoveries.

[2] Due to the nature of the Company's business and the complex invoices that result from the services provided, customers may withhold payments and attempt to renegotiate amounts invoiced. In addition, for some of the services provided, the Company's invoices are based on quotes that can either generate credits or debits when the actual revenue amount is known. Based on industry knowledge and historical trends, the Company records a revenue allowance accordingly. This practice causes the volume of activity flowing through the revenue allowance during the year to be higher than the balance at the end of the year. Increases in overall sales volumes and the expansion of the customer base in recent years have also increased the volume of additions and deductions to the allowance during the year, as well as increased the amount of the allowance at the end of the year.