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Earnings Per Share - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Senior convertible notes due 2040 [Member] |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Senior convertible notes convertible to common shares price | 15.65 |
Conversion price per share greater than applicable trading day | 125.00% |
Stock Options [Member] |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Options to purchase common shares not included in computation of diluted EPS | 2,800,000 | 2,900,000
Forward equity [Member] |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Forward Equity Agreement entered, not included in the computation of diluted EPS |  | 18,975,000

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- Definition The conversion rate for attributable to the Company's outstanding convertible debt securities due in a given year that could potentially dilute basic earnings per shares in the future that were not included in the computation of diluted EPS. + References No definition available. + Details
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- Details
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