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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