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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Supplemental profit sharing plan $ 5,316,000   $ 5,316,000   $ 4,946,000
Marketable securities 0   0   1,648,000
Other Income [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Gain loss on change in fair value of securities 100,000   200,000    
Other Income [Member] | Maximum [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Gain loss on change in fair value of securities   $ 100,000   $ 100,000  
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 5,300,000   5,300,000   2,800,000
Profit Sharing Plan [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Supplemental profit sharing plan $ 5,300,000   $ 5,300,000   $ 4,900,000