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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 29, 2019
Feb. 10, 2019
Mar. 29, 2018
Mar. 04, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Equity [Line Items]              
Dividend declared date   Feb. 10, 2019   Mar. 04, 2018      
Dividend payable, per share   $ 0.25   $ 0.25      
Dividend payable, date of record   Mar. 22, 2019   Mar. 21, 2018      
Dividend payable date   Mar. 29, 2019   Mar. 29, 2018      
Dividends paid to shareholders $ 3,500   $ 3,500   $ 3,595 $ 3,499  
Accrued dividends         $ 100   $ 200
Ordinary Shares B              
Equity [Line Items]              
Shares repurchased         0 0