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Stockholders Equity - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Class of Stock [Line Items] |  |
Preferred dividends description | Series A and Series B preferred stock - Dividends on our 4.0% Series A Convertible Preferred Stock and 4.0% Series B Convertible Preferred Stock (preferred stock) are accrued monthly and are payable in cash as approved by the Board of Directors. |
Series A and Series B preferred stock dividend rate percentage | 4.00% |
Preferred dividends accrued | $ 8 | $ 8
Quarterly dividend declared | $ 0.05 |
Dividend declared and paid | $ 7 |

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