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Preferred Stock - Number of Shares Issued and Outstanding and Carrying Amount of Preferred Stock (Parenthetical) (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Class Of Stock Disclosures [Abstract]
Par value of Preference shares issued and outstanding	$ 1.00	$ 1.00

- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

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