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Financial Instruments - Summary of Effects of Interest Rate Swap (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivatives, Fair Value [Line Items]      
Gain Recognized in AOCL, net of tax $ 44 $ 79 $ 161
Interest Rate Swap [Member] | Interest Expense [Member]      
Derivatives, Fair Value [Line Items]      
Gain Recognized in AOCL, net of tax 44 79 161
Loss Reclassified from AOCL into Expense $ 75 $ 128 $ 301