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Long-term investments - Schedule of Long-Term Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment carried at fair value | $ 814,530 | $ 0
Equity-method investees | 30,492 | 32,267
Other investments | 3,870 | 5,004
Other long-term investments | 34,362 | 37,271
Less: current portion | (1,407) | 0
Other long-term investments | 32,955 | 37,271
Notes Receivable | Development loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable from equity investees (e) | 101,416 | 30,060
Atlantica Yield |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Investment carried at fair value | 814,530 | 0
Abengoa-Algonquin Global Energy Solutions |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 2,622 | 0
Red Lily I Wind Facility |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 15,705 | 18,174
Interest in Amherst Wind Project |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 7,655 | 8,921
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Equity-method investees | 4,510 | $ 5,172
Variable Interest Entity, Not Primary Beneficiary | Windlectric | Notes Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable from equity investees (e) | $ 96,477 |

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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 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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