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Earnings and Dividends Per Share - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Senior convertible notes due 2040 [Member] | Dec. 31, 2013 Stock options [Member] | Dec. 31, 2012 Stock options [Member] | Dec. 31, 2011 Stock options [Member] | Mar. 31, 2011 Warrants [Member] | Dec. 31, 2011 Warrants [Member] | Dec. 31, 2009 Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares excluded from basic average shares outstanding | 1,800,000 | 2,400,000 | 1,900,000 |  |  |  |  |  |  |
Options to purchase common shares not included in computation of diluted EPS |  |  |  |  | 2,700,000 | 2,600,000 | 2,700,000 |  |  |
Senior convertible notes Convertible to common shares price |  |  |  | $ 15.33 |  |  |  |  |  |
Conversion price as a percentage of common share price |  |  |  | 125.00% |  |  |  |  |  |
Warrants to purchase common shares |  |  |  |  |  |  |  |  |  | 10,000,000
Exercise of warrants for common stock shares |  |  |  |  |  |  |  | 10,000,000 |  |
Warrants to purchase common shares included in the computation of diluted EPS | 0 | 0 | 1,194,000 |  |  |  |  |  | 10,000,000 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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