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Financial Instruments - Summary of Effects of Interest Rate Swap (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivatives, Fair Value [Line Items]        
Gain Recognized in AOCL, net of tax $ 44 $ 32 $ 161 $ 175
Interest Rate Swap [Member]
       
Derivatives, Fair Value [Line Items]        
Gain Recognized in AOCL, net of tax 44 32 161 175
Loss Reclassified from AOCL into Expense $ 75 $ 115 $ 301 $ 340