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Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, Foreign currency items $ 1,486 $ 3,354 $ 4,556
Current-period change, Foreign currency items (1,555) (1,868) (1,202)
Ending balance, Foreign currency items (69) 1,486 3,354
Beginning balance, Defined benefit pension plans (853) (849) (461)
Current-period change, Defined benefit pension plans (110) (4) (388)
Ending balance, Defined benefit pension plans (963) (853) (849)
Beginning balance, Accumulated other comprehensive income (loss) 633 2,505 4,095
Current-period change, Accumulated other comprehensive income (loss) (1,665) (1,872) (1,590)
Ending balance, Accumulated other comprehensive income (loss) $ (1,032) $ 633 $ 2,505