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Long-term investments - Schedule of Long-Term Investments (Detail) - CAD CAD in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | CAD 40,479 | CAD 64,419
Available-for-sale investment | 0 | 169
Other investments | 2,115 | 2,662
Total long-term investments | 84,467 | 105,433
Notes Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | 41,873 | 38,183
Notes Receivable | Development loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | 37,710 | 32,125
Notes Receivable | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | 4,163 | 6,058
Red Lily I Wind Facility |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 22,799 | 23,504
Deerfield Wind Project |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 0 | 34,727
Interest in Amherst Wind Project |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 11,191 | 558
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 6,489 | 5,630
Variable Interest Entity, Not Primary Beneficiary | Windlectric | Notes Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable | CAD 37,710 | CAD 29,723

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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