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Financial Instruments - Summary of Effects of Interest Rate Swaps (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivatives Fair Value [Line Items]    
Gain Recognized in AOCL, Net of Tax $ 450 $ 93
Interest Rate Swap [Member] | Interest Expense [Member]    
Derivatives Fair Value [Line Items]    
Gain Recognized in AOCL, Net of Tax 450 93
(Loss) Gain Reclassified from AOCL into Expense $ (38) $ 58