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Employee Benefit Plans - Schedule of Asset Category (Detail) - Pension Plan [Member]
Dec. 31, 2016
USD ($)
Defined Contribution Plan Disclosure [Line Items]  
Fixed income funds $ 83,868,508
U.S. Equity Funds [Member]  
Defined Contribution Plan Disclosure [Line Items]  
Fixed income funds 8,859,295
International Equity Funds [Member]  
Defined Contribution Plan Disclosure [Line Items]  
Fixed income funds 15,495,346
Fixed Income Funds [Member]  
Defined Contribution Plan Disclosure [Line Items]  
Fixed income funds $ 59,859,194