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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Supplemental profit sharing plan $ 6,059,000 $ 4,946,000
Marketable securities 0 1,648,000
Contingent liabilities 581,000  
Fair value liabilities Level 2 0  
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Supplemental profit sharing plan 0 0
Marketable securities   0
Contingent liabilities 581,000  
Other Income [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Gain loss on change in fair value of marketable securities 2,000,000 1,000,000
Other Assets [Member] | Corporate Owned Life Insurance Policy [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash surrender value 5,500,000 2,800,000
Other Noncurrent Liabilities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent liabilities 600,000  
Profit Sharing Plan [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Supplemental profit sharing plan $ 6,100,000 $ 4,900,000