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Financial Instruments - Summary of Effects of Interest Rate Swaps (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivatives, Fair Value [Line Items]        
(Loss) Gain Recognized in AOCL, net of tax $ (22) $ (231) $ 71 $ (763)
Interest Rate Swap [Member] | Interest Expense [Member]        
Derivatives, Fair Value [Line Items]        
(Loss) Gain Recognized in AOCL, net of tax (22) (231) 71 (763)
Gain (Loss) Reclassified from AOCL into Expense $ 42 $ (110) $ 100 $ 215