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Financial Instruments - Summary of Outstanding Interest Rate Swaps (Detail) - Interest Rate Swap [Member] - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Non-current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 50,000,000 | $ 50,000,000
Fair Value | 525,000 | $ 240,000
Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 10,000,000 |
Fair Value | $ 4,000 |

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