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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
1 Months Ended
Mar. 31, 2015
Feb. 28, 2014
Sep. 30, 2016
Dec. 31, 2015
Derivative [Line Items]        
Notional amount     $ 4,944,000 $ 5,151,000
Interest Rate Swaps Agreement        
Derivative [Line Items]        
Interest rate swap agreement, term 14 years 15 years    
Notional amount $ 1,200,000 $ 4,370,000