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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Supplemental profit sharing plan | $ 5,334,000 |  | $ 5,334,000 |  | $ 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 | 0 |  | 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 | 5,400,000 |  | 5,400,000 |  | 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

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