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Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Maximum length of time to hedges exposure to foreign currency exchange risk     15 months    
Foreign Currency Derivatives          
Derivative [Line Items]          
Notional Value $ 20,752,000   $ 20,752,000   $ 14,449,000
Interest Rate Swap          
Derivative [Line Items]          
Hedge Ineffectiveness Incurred $ 0 $ 0 $ 0 $ 0