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Shareholders' capital - Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Common Shares Rollforward
Beginning balance (in shares)	274,087,018	255,869,419
Public offering and subscription receipts (in shares)	43,470,000	12,938,457
Debt conversion, shares issued (in shares)	108,370,081	0
Dividend reinvestment plan (in shares)	3,905,848	2,322,618
Exercise of share-based awards	1,932,988	2,956,524
Ending balance (in shares)	431,765,935	274,087,018

X

- Definition

Stock Issued During Period, Shares, Dividend reinvestment and Employee Stock Purchase Plan

+ References

No definition available.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of new stock issued during the period.

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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