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Financial Instruments - Summary of Effects of Interest Rate Swap (Detail) - Interest Rate Swap [Member] - Interest Expense [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Gain Recognized in AOCL, net of tax $ 230 $ 206
Loss Reclassified from AOCL into Expense $ (214) $ (376)