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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Effect of Company's Equity Derivative Instruments on Net Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on equity derivative instruments | $ 0 | $ 21,926 | $ (40,157)
Warrants [Member] | Gain (loss) on equity derivative instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) on equity derivative instruments |  | $ 21,900 | $ (40,100)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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