Investment in Non-Consolidated Joint Venture - Summarized Balance Sheet Information for Joint Venture (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Current assets	$ 37,441	$ 31,295
Non-current assets	23,463	22,522
Total assets	60,904	53,817
Current liabilities	15,853	13,549
Total liabilities	$ 15,853	$ 13,549