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Financial instruments - Fair Value of Financial Instruments (Detail) $ in Thousands, $ in Thousands | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Level 1 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Long-term investment carried at fair value | $ 1,018,837 |  | $ 814,530 |
Total financial assets |  | $ 1,018,837 | 814,530 |
Long-term debt |  | 1,446,278 |  | $ 768,400
Convertible debentures |  | 627 |  | 639
Total financial liabilities |  | 1,446,905 |  | 769,039
Level 2 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Development loans and other receivables |  | 12,294 |  | 110,019
Derivative financial instruments, assets |  | 1,120 |  | 970
Total financial assets |  | 13,414 |  | 110,989
Long-term debt |  | 2,603,285 |  | 2,588,373
Convertible debentures |  | 0 |  |
Derivative financial instruments, liabilities |  | 89,370 |  | 102,785
Total financial liabilities |  | 2,707,485 |  | 2,704,861
Level 2 | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 0 |  |
Level 2 | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets | 0 |  |  |
Level 2 | Energy contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 0 |  |
Level 2 | Forward contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 1,120 |  | 869
Derivative financial instruments, liabilities | 632 |  |  |
Level 2 | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 76,532 |  | 93,198
Level 2 | Foreign exchange forward | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 9,608 |  |  |
Level 2 | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 2,598 |  | 1,114
Level 2 | Commodity contracts for regulatory operations | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 101
Level 2 | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  |  | 8,473
Level 2 | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  |  | 13,703
Preferred shares, Series C |  | 14,830 |  |
Level 3 |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Development loans and other receivables |  | 0 |  | 0
Long-term investment carried at fair value | 78,824 |  | $ 0 |
Derivative financial instruments, assets |  | 80,997 |  | 61,838
Total financial assets |  | 159,821 |  | 61,838
Derivative financial instruments, liabilities |  | 88 |  | 57
Total financial liabilities |  | 88 |  | 57
Level 3 | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 80,574 |  | 61,838
Derivative financial instruments, liabilities |  | 63 |  | 57
Level 3 | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets | 423 |  |  |
Level 3 | Energy contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 25 |  |
Level 3 | Forward contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 0
Portion at Other than Fair Value Measurement | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 200 |  |
Carrying amount |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Development loans and other receivables |  | 12,242 |  | 103,696
Long-term investment carried at fair value |  | 1,097,661 |  | 814,530
Derivative financial instruments, assets |  | 82,117 |  | 62,808
Total financial assets |  | 1,192,020 |  | 981,034
Long-term debt |  | 3,781,906 |  | 3,336,795
Convertible debentures |  | 397 |  | 470
Derivative financial instruments, liabilities |  | 89,458 |  | 102,842
Total financial liabilities |  | 3,885,621 |  | 3,453,525
Carrying amount | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 80,574 |  | 61,838
Derivative financial instruments, liabilities |  | 63 |  | 57
Carrying amount | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets | 423 |  |  |
Carrying amount | Energy contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 25 |  |
Carrying amount | Forward contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 1,120 |  |
Derivative financial instruments, liabilities | 632 |  |  |
Carrying amount | Forward contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 869
Carrying amount | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 76,532 |  | 93,198
Carrying amount | Foreign exchange forward | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | 9,608 |  |  |
Carrying amount | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 2,598 |  | 1,114
Carrying amount | Commodity contracts for regulatory operations | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 101
Carrying amount | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  |  | 8,473
Carrying amount | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  |  | 13,418
Preferred shares, Series C |  | 13,860 |  |
Fair value |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Development loans and other receivables |  | 12,294 |  | 110,019
Long-term investment carried at fair value |  | 1,097,661 |  | 814,530
Derivative financial instruments, assets |  | 82,117 |  | 62,808
Total financial assets |  | 1,192,072 |  | 987,357
Long-term debt |  | 4,049,563 |  | 3,356,773
Convertible debentures |  | 627 |  | 639
Derivative financial instruments, liabilities |  | 89,458 |  | 102,842
Total financial liabilities |  | 4,154,478 |  | 3,473,957
Fair value | Energy contracts | Designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 80,574 |  | 61,838
Derivative financial instruments, liabilities |  | 63 |  | 57
Fair value | Energy contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets | 423 |  |  |
Fair value | Energy contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 25 |  |
Fair value | Forward contracts | Not designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 1,120 |  |
Derivative financial instruments, liabilities | 632 |  |  |
Fair value | Forward contracts | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 869
Fair value | Cross currency swap | Designated as a hedge | Net Investment Hedging |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 76,532 |  | 93,198
Fair value | Foreign exchange forward | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities | $ 9,608 |  |  |
Fair value | Commodity contracts for regulatory operations |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  | 2,598 |  | 1,114
Fair value | Commodity contracts for regulatory operations | Not designated as a hedge | Cash flow hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, assets |  |  |  | 101
Fair value | Interest rate swaps | Designated as a hedge |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Derivative financial instruments, liabilities |  |  |  | 8,473
Fair value | Series C Preferred Stock |  |  |  |
Fair Value of Financial Instruments [Line Items] |  |  |  |
Convertible debentures |  |  |  | $ 13,703
Preferred shares, Series C |  | $ 14,830 |  |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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