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Investment in Non-Consolidated Joint Venture - Summarized Balance Sheet Information for Joint Venture (Detail) - Joint Venture [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Current assets $ 28,507 $ 24,140
Non-current assets 23,299 21,519
Total assets 51,806 45,659
Current liabilities 11,919 14,162
Total liabilities $ 11,919 $ 14,162