Schedule I - Condensed Financial Information of Parent Company (Balance Sheets) (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Apr. 29, 2014	Dec. 31, 2013
Condensed Balance Sheet Statements, Captions [Line Items]
Series A preferred stock, par value	$ 0.01
Series A preferred stock, shares authorized	18,000us-gaap_TemporaryEquitySharesAuthorized
Series A preferred stock, shares outstanding	12,600		0
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000us-gaap_CommonStockSharesAuthorized		400,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding	252,728,684us-gaap_CommonStockSharesOutstanding		250,324,898us-gaap_CommonStockSharesOutstanding
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Series A preferred stock, par value	$ 0.01
Series A preferred stock, shares authorized	18,000
Series A preferred stock, shares outstanding	12,600		0
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares authorized	400,000,000		400,000,000
Common stock, shares outstanding	252,728,684		250,324,898

The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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