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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - CAD CAD in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |
Net earnings attributable to shareholders of APUC | CAD 193,094 | CAD 130,924
Series A and D Preferred shares dividend | 10,400 | 10,400
Net earnings attributable to common shareholders of APUC from continuing operations – Basic and Diluted | CAD 182,694 | CAD 120,524
Weighted average number of shares |  |
Basic (in shares) | 382,323,434 | 271,832,430
Effect of dilutive securities (in shares) | 3,662,714 | 2,244,602
Diluted (in shares) | 385,986,148 | 274,077,032
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Series A and D Preferred shares dividend | CAD 5,400 | CAD 5,400
Series D Preferred Stock |  |
Class of Stock [Line Items] |  |
Series A and D Preferred shares dividend | CAD 5,000 | CAD 5,000

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