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Stockholders' Equity (Detail) (USD $)	12 Months Ended
Stockholders' Equity (Detail) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity [Line Items]
Preferred stock, par value	$ 0.01
Price per one one-thousandth of a preferred share	$ 45.00
Ownership of outstanding common shares	10.00%	80.00%
Expiration date	September 6, 2021
Preferred stock, redemption price per share	$ 0.01
Minimum [Member]
Stockholders' Equity [Line Items]
Percentage of assets acquired	50.00%
Percentage of outstanding common shares acquired	5000.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- 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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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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