Commitments and Contingencies (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	1 Months Ended		1 Months Ended	12 Months Ended
	Mar. 17, 2010	Dec. 31, 2007	Sep. 30, 2012	Dec. 31, 2007 Polyone	Dec. 31, 2011 Polyone
Commitments and Contingencies Disclosure [Line Items]
Minimum number of years between arbitrations		5 years
Reimbursement of remediation costs sought by PolyOne	$ 1,400
Percentage of costs related to environmental issues to be paid by PolyOne				100.00%
Costs incurred environmental remediation services					3,287
Agreed cash penalty payment to settle allegations resulting from audit			$ 500