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Basis of Presentation - Additional Information (Detail) (8.5% Senior Notes Due 2016, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 19, 2012
8.5% Senior Notes Due 2016
Business Acquisitions and Dispositions [Line Items]
Senior unsecured notes principal amount	$ 400	$ 400
Senior notes, interest rate	8.50%	8.50%
Senior notes, maturity date	2016

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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