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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in marketable securities |  |  | $ 4,690,000 | $ 0 |
Marketable securities |  | $ 1,737,000 | 1,737,000 |  |
Supplemental profit sharing plan |  | 4,632,000 | 4,632,000 |  |
Profit Sharing Plan [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Supplemental profit sharing plan |  | 4,600,000 | 4,600,000 |  | $ 4,800,000
Corporate Owned Life Insurance Policy [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Amount sold from available-for-sale securities | $ 2,900,000 | 3,000,000 |  |  |
Corporate Owned Life Insurance Policy [Member] | Other Assets [Member] |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Cash surrender value |  | $ 3,000,000 | 3,000,000 |  |
Maximum [Member] | 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 |  |

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