Investment in Non-Consolidated Joint Venture - Summarized Balance Sheet Information for Joint Venture (Detail) - Joint Venture [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Current assets	$ 23,230	$ 24,140
Non-current assets	24,117	21,519
Total assets	47,347	45,659
Current liabilities	11,333	14,162
Total liabilities	$ 11,333	$ 14,162