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Pension and Other Post Retirement Benefit Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Insurance policy value $ 2,592,000 $ 2,148,000  
401(k) Plan      
Defined Benefit Plan Disclosure [Line Items]      
Cost recognized for contributions to defined contribution plan 1,384,000 $ 1,471,000 $ 1,396,000
United States      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expected employer contribution in next fiscal year 0    
German Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, expected employer contribution in next fiscal year $ 0