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Retirement Plans - Additional Information (Detail) - USD ($) | 2 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 29, 2016
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Employer contribution for first 3% of employee contributions |  | 100.00% |  |
Employer contribution for next 2% of employee contributions |  | 50.00% |  |
Percentage of first specified employee contributions |  | 3.00% |  |
Percentage of next specified employee contributions |  | 2.00% |  |
Contribution for retirement plan |  | $ 26,898 | $ 24,238 |
Maximum amount allocated to purchase common stock under ESOP |  |  |  | $ 5,000,000
Number of common stock, shares purchased | 682,500 |  |  |
Purchased common stock, value | $ 4,900,000 |  |  |

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