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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Dividends declared per common share | $ 0.13 |  |  |
Estimated dividend payment | $ 26 |  |  |
Common stock issued | 205,707,580 | 204,660,621 | 202,528,616 | 169,272,636
Common stock outstanding | 196,198,672 | 194,557,669 |  |
Dividends declared date | Feb. 18, 2014 |  |  |
Dividends declared payable date | Mar. 21, 2014 |  |  |
Dividends declared date of record | Mar. 01, 2014 |  |  |

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