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Financial Instruments - Summary of Outstanding Interest Rate Swaps (Detail) - Interest Rate Swap [Member] - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Non-current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 55,000,000 | $ 50,000,000
Fair Value | 1,055,000 | 525,000
Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 15,000,000 | 10,000,000
Fair Value | $ 76,000 | $ 4,000

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