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Cash Dividends Declared Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Oct. 24, 2016
Nov. 02, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dividends [Line Items]                          
Dividend Per Share $ 0.20 $ 0.15 $ 0.0500 $ 0.0375 $ 0.0375 $ 0.0375 $ 0.0375 $ 0.0375 $ 0.0375 $ 0.0375 $ 0.20 $ 0.2625 $ 0.15
Amount     $ 7,065 $ 5,297 $ 5,290 $ 5,290 $ 5,232 $ 5,230 $ 5,166 $ 5,156 $ 22,942 $ 20,784