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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) | 12 Months Ended
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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

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