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Shareholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 14, 2018
USD ($)
$ / shares
Sep. 13, 2018
USD ($)
$ / shares
Jun. 14, 2018
USD ($)
$ / shares
Mar. 05, 2018
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2016
Dec. 31, 2017
USD ($)
shares
Jan. 01, 2017
USD ($)
Shareholders equity [line items]                
Common shares authorized | shares         1,000,000,000      
Subscribed and paid up capital         $ 1,551.6   $ 1,438.0 $ 1,438.0
Subscribed and paid up capital, shares | shares         740,465,044      
Shares held in Treasury | shares         4,977,698   7,423,705  
Description of common stock voting right         Each common share generally empowered with one vote at general shareholders' meeting, considering that no shareholder or group of shareholders, may exercise votes representing more than 5% of the quantity of shared into which our capital stock is divided. Votes that exceed this 5% threshold will not be considered.      
Percentage of equity reserve of investment and working capital exceeds         0.80      
Increase in capital       $ 113.6        
Amount of shares held in Treasury         $ 31.4   $ 51.8 $ 49.1
Market value of treasury shares         $ 27.5   $ 44.4  
Percentage of net profit on statutory reserve           5.00%    
Interest on capital $ 1.9 $ 1.8 $ 3.8 $ 4.4        
Interest on capital per share | $ / shares $ 0.01 $ 0.01 $ 0.01 $ 0.01        
Percentage of withholding tax       15.00%        
Percentage of income tax     15.00%          
Top of range [member]                
Shareholders equity [line items]                
Percentage of reserve on capital           20.00%    
Percentage of reserve on capital and capital reserve           30.00%