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Related party transactions (Detail) CAD in Thousands, $ in Thousands		12 Months Ended
	Oct. 14, 2016 CAD	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CAD	Dec. 31, 2016 USD ($)
Emera
Transactions with Third Party [Line Items]
Amounts due from related party			$ 4,397		$ 10,185
Amounts purchased from related party			1,006		3,939
Reimbursement of expenses | CAD	CAD 680
Amounts due to related party			1,467		757
Equity Method Investee
Transactions with Third Party [Line Items]
Reimbursement of expenses | CAD		CAD 5,969		CAD 3,313
Design, Engineering, Supply and Construction Agreement | Emera
Transactions with Third Party [Line Items]
Related party contract amount			$ 9,500
Trafalgar Power Foreclosed Debt by Related Entity | Related Entity
Transactions with Third Party [Line Items]
Litigation settlement, amount					10,083
Reimbursement of legal fees					2,900
Gain related to litigation settlement					$ 6,600

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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Amount of transactions with related party during the financial reporting period.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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