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Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investments in marketable securities | $ 4,308 |
Supplemental profit sharing plan | 4,266 |
Profit Sharing Plan [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Supplemental profit sharing plan | $ 4,700 | $ 4,800

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