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Earnings Per Share - Calculation of Weighted Average Common Shares Outstanding used in Computation of Diluted Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]
Weighted average basic common shares outstanding (in shares)	479,154	461,008	478,494	430,802
Effect of dilutive securities
Restricted stock (in shares)	0	9,499	0	9,443
Convertible preferred stock (in shares)	0	90,133	0	90,133
Weighted average diluted common and potential common shares outstanding (in shares)	479,154	560,640	478,494	530,378

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible preferred stock using the if-converted method.

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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