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Derivatives - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2012
Fair Value, Observable inputs, Level Two
Aug. 20, 2012
Interest Rate Swap Agreements
Dec. 31, 2012
Interest Rate Swap Agreements
Derivative [Line Items]          
Notional amount       $ 35,000,000  
Commencement date       2013-03  
Expiry date       2018-06  
Derivative fair value adjustment, net of tax (272,000) 57,000     (272,000)
Fair value of derivative instruments, liability     $ 454,000