Retirement Plans - Additional Information (Detail) - USD ($) |
12 Months Ended | ||||
---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 29, 2016 |
Jan. 02, 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 | $ 63,944 | $ 40,768 | $ 40,586 | ||
Maximum amount allocated to purchase common stock under ESOP | $ 5,000,000 | $ 5,000,000 |