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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Mar. 31, 2015
Feb. 28, 2014
Oct. 31, 2013
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Derivative [Line Items]            
Notional amount       $ 15,852 $ 8,937 $ 14,861
Interest Rate Swaps Agreement            
Derivative [Line Items]            
Interest rate swap agreement, term 14 years 15 years 10 years      
Notional amount $ 1,200 $ 4,370 $ 3,500