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Long-term investments - Preliminary Allocation of the Assets Acquired and Liabilities Assumed (Detail) - CAD | Dec. 31, 2017 | Sep. 15, 2016
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Odell SponsorCo |  |
Business Acquisition [Line Items] |  |
Working capital |  | CAD 11,836,000
Property, plant and equipment |  | 469,222,000
Asset retirement obligation |  | (4,812,000)
Deferred tax liability |  | (4,273,000)
Non-controlling interest (tax equity investors) |  | CAD 237,156,000
Net assets acquired | CAD 234,817,000 |
Deerfield SponsorCo |  |
Business Acquisition [Line Items] |  |
Working capital | (14,551,000) |
Property, plant and equipment | 442,086,000 |
Construction loan | (352,666,000) |
Asset retirement obligation | (2,816,000) |
Deferred revenue | (1,556,000) |
Deferred tax liability | (1,979,000) |
Net assets acquired | 68,518,000 |
Cash and cash equivalent | 4,183,000 |
Net assets acquired, net of cash and cash equivalent | CAD 64,335,000 |

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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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