Dividends (Detail) - CAD	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Dividends [Line Items]
Dividend declared for common share holders	CAD 124,831,000	CAD 83,097,000
Cash dividend declared per common share (CAD per share)	CAD 0.4867	CAD 0.3695
Series A Preferred Stock
Dividends [Line Items]
Dividends declared for preferred share holders	CAD 5,400,000	CAD 5,400,000
Dividend declared per preferred share (CAD per share)	CAD 1.1250	CAD 1.1250
Series D Preferred Stock
Dividends [Line Items]
Dividends declared for preferred share holders	CAD 5,000,000	CAD 4,103,000
Dividend declared per preferred share (CAD per share)	CAD 1.2500	CAD 1.0257

Dividends [Line Items]

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Aggregate dividends paid during the period for each share of preferred stock outstanding.

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