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Subsequent Event - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012 6% Senior Notes due 2043 [Member]
Subsequent Event [Line Items]
Aggregate principal amount of senior notes		$ 250,000,000
Interest rate		6.00%
Proceeds from issuance of Senior notes	242,288,000	247,800,000
Underwriting fees		$ 2,200,000

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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