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Other, net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Income and Expenses [Abstract]        
Foreign currency transaction gains (losses) $ 1.7 $ 1.8 $ 1.7 $ 1.1