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Accumulated Balances of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance $ (22,332) $ (21,983) $ (22,611)
Net current period change 86 (349) 630
Reclassification adjustments for gains reclassified into income     (2)
Ending balance (22,246) (22,332) (21,983)
Foreign currency items      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (22,246) (21,914) (22,555)
Net current period change 66 (332) 641
Ending balance (22,180) (22,246) (21,914)
Unrealized gain on securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance     2
Reclassification adjustments for gains reclassified into income     (2)
Pension and post retirement benefit plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning balance (86) (69) (58)
Net current period change 20 (17) (11)
Ending balance $ (66) $ (86) $ (69)