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Provision for Contingencies - Schedule of Provision for Estimated Possible Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Nature And Amount Of Loss Contingencies [line items]    
Estimated possible losses recognized $ 63,351 $ 54,821
Civil [member]    
Disclosure Of Nature And Amount Of Loss Contingencies [line items]    
Estimated possible losses recognized 59,206 50,473
Labor [member]    
Disclosure Of Nature And Amount Of Loss Contingencies [line items]    
Estimated possible losses recognized $ 4,145 $ 4,348