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Long-term debt - Schedule of Long-term Debt (Detail)	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CAD
Debt Instrument [Line Items]
Less: current portion	CAD (15,511,000)		CAD (10,075,000)
Long-term debt, excluding current portion	3,847,785,000		3,903,340,000
Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term debt	3,863,296,000		3,913,415,000
Less: current portion	(15,511,000)		(10,075,000)
Long-term debt, excluding current portion	CAD 3,847,785,000		3,903,340,000
Senior Unsecured Notes | Canadian Dollar Senior Unsecured Notes
Debt Instrument [Line Items]
Weighted average coupon	4.61%	4.61%
Par value	CAD 785,669,000
Long-term debt	CAD 781,833,000		487,389,000
Senior Unsecured Notes | Canadian Dollar Senior Secured Project Notes
Debt Instrument [Line Items]
Weighted average coupon	10.27%	10.27%
Par value	CAD 33,568,000
Long-term debt	CAD 33,507,000		35,600,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Notes
Debt Instrument [Line Items]
Weighted average coupon	4.09%	4.09%
Par value | $		$ 1,225,000,000
Long-term debt	CAD 1,527,726,000		700,600,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Utility Notes
Debt Instrument [Line Items]
Weighted average coupon	5.98%	5.98%
Par value | $		$ 227,000,000
Long-term debt	CAD 309,309,000		174,206,000
Senior Unsecured Notes | U.S Dollar Senior Secured Utility Bonds
Debt Instrument [Line Items]
Weighted average coupon	4.95%	4.95%
Par value | $		$ 752,500,000
Long-term debt	CAD 969,567,000		132,551,000
Revolving Credit Facility | Senior Unsecured Notes
Debt Instrument [Line Items]
Weighted average coupon	0.00%	0.00%
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Revolving Credit Facilities (a)
Debt Instrument [Line Items]
Long-term debt	CAD 65,017,000		242,947,000
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Bank Credit Facilities (b)
Debt Instrument [Line Items]
Long-term debt	169,343,000		2,140,122,000
Revolving Credit Facility | Senior Unsecured Notes | Commercial Paper
Debt Instrument [Line Items]
Long-term debt	CAD 6,994,000		CAD 0

X

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Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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