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Derivative Instruments and Hedging Activities - Notional Amounts and Fair Values of Derivatives Designated as Hedging Instruments (Detail) (Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]    
Notional Amount   $ 20,000
Derivative Assets, Fair Value      
Derivative Liabilities, Fair Value   1,909
Interest Rate Swap [Member] | Cash Flow Hedge [Member]
   
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]    
Notional Amount   20,000
Derivative Assets, Fair Value      
Interest Rate Swap [Member] | Cash Flow Hedge [Member] | Other Liabilities [Member]
   
Derivative Notional Amount And Fair Value By Balance Sheet Designated As Hedging Instrument [Line Items]    
Derivative Liabilities, Fair Value   $ 1,909