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Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, Foreign currency items $ 3,354 $ 4,556 $ 3,923
Current-period change, Foreign currency items (1,868) (1,202) 633
Ending balance, Foreign currency items 1,486 3,354 4,556
Beginning balance, Defined benefit pension plans (849) (461) (258)
Current-period change, Defined benefit pension plans (4) (388) (203)
Ending balance, Defined benefit pension plans (853) (849) (461)
Beginning balance, Accumulated other comprehensive income (loss) 2,505 4,095 3,665
Current-period change, Accumulated other comprehensive income (loss) (1,872) (1,590) 430
Ending balance, Accumulated other comprehensive income (loss) $ 633 $ 2,505 $ 4,095