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Employee Benefit Plans - Summary of Change in Benefit Obligation (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
Pension Plan [Member]  
Change in Projected Benefit Obligation  
Interest cost $ 530,839
Actuarial (gain) loss (965,046)
Business combinations 88,705,097
Benefits paid (409,084)
Benefit obligation at end of year 87,861,806
Supplemental Employee Retirement Plan [Member]  
Change in Projected Benefit Obligation  
Interest cost 51,696
Actuarial (gain) loss (415,416)
Business combinations 9,154,118
Benefits paid (38,550)
Benefit obligation at end of year 8,751,848
Postretirement Benefits [Member]  
Change in Projected Benefit Obligation  
Service cost 8,169
Interest cost 11,097
Plan participants' contributions 1,939
Actuarial (gain) loss (103,396)
Business combinations 1,859,010
Benefits paid (20,396)
Benefit obligation at end of year $ 1,756,423