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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