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Stock Options and Capital Stock - Additional Information (Detail) (Cumulative Preferred Stock, USD $)	Mar. 31, 2013
Cumulative Preferred Stock
Class of Stock [Line Items]
Preferred stock, authorized shares	1,000,000
Preferred stock, par value	$ 1

- 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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