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Investment in Joint Venture - Summarized Balance Sheet Information of Joint Venture (Detail) - Joint Venture [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 41,367 | $ 31,295
Non-current assets | 29,176 | 22,522
Total assets | 70,543 | 53,817
Current liabilities | 26,746 | 13,549
Total liabilities | $ 26,746 | $ 13,549

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