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Income Taxes - Income Tax Purpose Distribution Paid to Preferred Shareholders are Classified as Ordinary Income (Parenthetical) (Detail) (Series J Preferred Stock [Member])	12 Months Ended
	Dec. 31, 2012
Income Tax [Line Items]
Depositary Shares of Series J Preferred Stock redeemed	2,000,000
Depositary Shares [Member]
Income Tax [Line Items]
Depositary Shares of Series J Preferred Stock redeemed	2,000,000

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- Definition

Preferred Stock Redeemed Shares

+ References

No definition available.

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