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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
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