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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - CAD / shares	Dec. 31, 2016	Dec. 31, 2015	Feb. 19, 2014
Statement of Stockholders' Equity [Abstract]
Dividends (note 17(d)) ($0.08 per share)	CAD 0.08	CAD 0.08	CAD 0.08

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- Definition

Dividends Payable, Annual Aggregate Dividend

+ References

No definition available.

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration