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Investment in Joint Venture - Summarized Balance Sheet Information of Unconsolidated Joint Venture (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Current assets	$ 58,517	$ 47,600
Non-current assets	32,844	24,763
Total assets	91,361	72,363
Current liabilities	41,504	26,165
Total liabilities	$ 41,504	$ 26,165

X

- Definition

The amount of assets reported by an equity method investment of the entity.

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