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Other, Net - Other Net in Consolidated Statements of Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Nonoperating Income Expense [Abstract]      
Foreign exchange gains (losses) $ 686 $ (220) $ (1,495)
Investment income 877 1,269 1,055
Realized and unrealized gains on investments 21 241 2,611
Other, net $ 1,584 $ 1,290 $ 2,171