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Basic and diluted net earnings per share - Schedule of Earnings per Share (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]    
Net earnings attributable to shareholders of APUC $ 184,988 $ 149,475
Series A and D Preferred shares dividend 8,027 8,020
Net earnings attributable to common shareholders of APUC from continuing operations – Basic and Diluted $ 176,961 $ 141,455
Weighted average number of shares    
Basic (in shares) 461,818,023 382,323,434
Effect of dilutive securities (in shares) 4,227,595 3,662,714
Diluted (in shares) 466,045,618 385,986,148
Series A Preferred Stock    
Class of Stock [Line Items]    
Series A and D Preferred shares dividend $ 4,169 $ 4,164
Series D Preferred Stock    
Class of Stock [Line Items]    
Series A and D Preferred shares dividend $ 3,858 $ 3,856