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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Class of Stock [Line Items] |  |  |  |
Net earnings attributable to shareholders of APUC | $ 286,219 | $ 156,625 | $ 222,422 | $ 243,031
Series A and D Preferred shares dividend | 2,017 | 2,109 | 4,157 | 4,215
Net earnings attributable to common shareholders of APUC – basic and diluted | $ 284,202 | $ 154,516 | $ 218,265 | $ 238,816
Weighted average number of shares |  |  |  |
Basic (in shares) | 529,440,246 | 493,071,189 | 527,634,250 | 491,811,210
Effect of dilutive securities (in shares) | 4,812,876 | 4,656,910 | 4,920,714 | 3,291,211
Diluted (in shares) | 534,253,122 | 497,728,099 | 532,554,964 | 495,102,421
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Series A and D Preferred shares dividend | $ 1,107 | $ 1,158 | $ 2,282 | $ 2,323
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Series A and D Preferred shares dividend | $ 910 | $ 951 | $ 1,875 | $ 1,892

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