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Consolidated Balance Sheets (Parenthetical) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Statement Of Financial Position [Abstract] | ||
| Class A preferred shares, without par value | $ 0us-gaap_PreferredStockNoParValue | $ 0us-gaap_PreferredStockNoParValue |
| Class A preferred shares, shares issued | 0us-gaap_PreferredStockSharesIssued | 0us-gaap_PreferredStockSharesIssued |
| Class A preferred shares, shares outstanding | 0us-gaap_PreferredStockSharesOutstanding | 0us-gaap_PreferredStockSharesOutstanding |
| Common shares, without par value | $ 0us-gaap_CommonStockNoParValue | $ 0us-gaap_CommonStockNoParValue |
| Common shares, Shares issued | 130,048,326us-gaap_CommonStockSharesIssued | 129,365,076us-gaap_CommonStockSharesIssued |
| Common shares, Shares outstanding | 130,048,326us-gaap_CommonStockSharesOutstanding | 129,365,076us-gaap_CommonStockSharesOutstanding |
| X | ||||||||||
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- Definition
Face amount per share of no-par value common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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