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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
 1 Months Ended
Mar. 31, 2015
Feb. 28, 2014
Oct. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]          
Notional amount       $ 5,335,000 $ 8,937,000
Interest Rate Swaps Agreement          
Derivative [Line Items]          
Interest rate swap agreement, term 14 years 15 years 10 years    
Notional amount $ 1,200,000 $ 4,370,000 $ 3,500,000