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Investments in Foreign Joint Venture - Schedule of Financial Information of Foreign Joint Venture (Detail) - BOMAY - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Assets:          
Total current assets $ 67,322   $ 67,322   $ 59,124
Total non-current assets 3,337   3,337   5,742
Total assets 70,659   70,659   64,866
Liabilities and equity:          
Total liabilities 44,685   44,685   38,732
Total joint ventures’ equity 25,974   25,974   26,134
Total liabilities and equity 70,659   70,659   $ 64,866
Revenue 17,284 $ 12,231 28,784 $ 20,309  
Gross Profit 2,479 1,912 4,440 3,697  
Earnings $ 1,097 $ 710 $ 1,759 $ 1,137