Quarterly Results of Operations (Parenthetical) (Detail) (USD $)	3 Months Ended							12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information [Line Items]
Goodwill, Impairment Loss Net of Tax		$ 4,700,000
Earnings per Share, Diluted, Goodwill Impairment		$ 0.11
Restructuring and Other Postemployment Charges, Net of Tax		6,000,000	4,200,000
Earnings per Share, Diluted, Restructuring and Other Postemployment Charges		$ 0.14	$ 0.08
Income Tax Benefit, Expiration of Certain Tax Reserves	5,000,000
Earnings per Share, Diluted, Expiration of Certain Tax Reserves	$ 0.12
(Loss) gain on extinguishment of debt, net of tax					8,200,000	14,700,000
Earnings per Share, Diluted, Loss on Extinguishment of Debt					$ 0.16	$ 0.28
Loss on Extinguishment of Debt and related charges, Net of Tax				3,400,000
Earnings per Share, Diluted, Loss on Extinguishment of Debt and related charges				$ 0.07
Impairment of Intangible Assets, Finite-lived, Net of Tax			4,300,000
Earnings per Share, Diluted, Impairment of Intangible Assets, Finite-lived			$ 0.09
Gain from litigation settlement, net (Note 8)							301,400,000
Earnings per Share, Diluted, Gain on Litigation Settlement							$ 5.85
Repayments of long-term debt								15,000,000	713,667,000	304,845,000
Senior Notes due 2015 [Member]
Quarterly Financial Information [Line Items]
Repayments of long-term debt						$ 297,800,000				$ 297,800,000