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Earnings Per Share - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 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 | $ 15.55 |  | $ 15.55 |
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 | 2.7 | 2.8 | 2.7 | 2.8
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 | 39.1 | 19.0 | 39.1 | 19.0

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- Definition Conversion Price Per Share Percentage + References No definition available. + Details
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Period Type: | duration

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- Details
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- Definition Incremental common shares attributable to equity forward agreements not included in computation of diluted Eps. + References No definition available. + Details
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- Definition Options to purchase common shares not included in the computation of diluted EPS. + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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