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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |
Net earnings attributable to shareholders of APUC | $ 156,625 | $ 65,462 | $ 243,031 | $ 83,060
Series A and D Preferred shares dividend | 2,109 | 2,014 | 4,215 | 4,070
Net earnings attributable to common shareholders of APUC from continuing operations – Basic and Diluted | $ 154,516 | $ 63,448 | $ 238,816 | $ 78,990
Weighted average number of shares |  |  |  |
Basic (in shares) | 493,071,189 | 462,608,870 | 491,811,210 | 447,861,135
Effect of dilutive securities (in shares) | 4,656,910 | 4,173,646 | 3,291,211 | 3,996,021
Diluted (in shares) | 497,728,099 | 466,782,516 | 495,102,421 | 451,857,156
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Series A and D Preferred shares dividend | $ 1,158 | $ 1,046 | $ 2,323 | $ 2,114
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Series A and D Preferred shares dividend | $ 951 | $ 968 | $ 1,892 | $ 1,956

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