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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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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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