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Stock Based Compensation - Additional Information (Detail) (USD $)	9 Months Ended		1 Months Ended	12 Months Ended				1 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Feb. 29, 2012 Performance stock units	Dec. 31, 2011 Performance stock units	Dec. 31, 2011 Performance stock units long term incentive plan 2010-2012 [Member] Performance stock units	Dec. 31, 2011 Long-Term Incentive Plan 2011- 2013	Dec. 31, 2011 Long-Term Incentive Plan 2011- 2013 Performance stock units	Feb. 29, 2012 Long-Term Incentive Plan 2012- 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units granted	589,934		589,934	311,670
Long-Term Incentive Plan were granted stock options which vest						One third each year		One third each year
Weighted average fair value units granted	$ 7.33	$ 11.57
Units earned					0		0
Cash earned					$ 0		$ 0

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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