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Long-term investments - Preliminary Allocation of the Assets Acquired and Liabilities Assumed (Detail) - CAD
Dec. 31, 2017
Sep. 15, 2016
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