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Earnings Per Share - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2013 8.5% Convertible perpetual preferred stock	Sep. 30, 2012 8.5% Convertible perpetual preferred stock	Sep. 30, 2013 6.0% Convertible perpetual preferred stock	Sep. 30, 2012 6.0% Convertible perpetual preferred stock	Sep. 30, 2013 7.0% Convertible perpetual preferred stock	Sep. 30, 2012 7.0% Convertible perpetual preferred stock
Earnings Per Share Disclosure
Restricted stock awards, antidilutive	0.4	1.0
Preferred stock, dividend rate, percentage			8.50%	8.50%	6.00%	6.00%	7.00%	7.00%

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

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