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Investments in Foreign Joint Ventures - Schedule of Financial Information of Foreign Joint Ventures (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
BOMAY          
Assets:          
Total current assets $ 53,015   $ 53,015   $ 47,700
Total non-current assets 3,532   3,532   3,589
Total assets 56,547   56,547   51,289
Liabilities and equity:          
Total liabilities 29,726   29,726   24,196
Total joint ventures’ equity 26,821   26,821   27,093
Total liabilities and equity 56,547   56,547   51,289
Revenue 6,076 $ 5,557 17,225 $ 29,544  
Gross Profit 1,160 1,582 3,805 4,844  
Earnings 245 537 709 1,602  
MIEFE          
Assets:          
Total current assets 179   179   425
Total non-current assets 16   16   17
Total assets 195   195   442
Liabilities and equity:          
Total liabilities 258   258   551
Total joint ventures’ equity (63)   (63)   (109)
Total liabilities and equity 195   195   $ 442
Revenue 46 307 80 1,147  
Gross Profit 10 133 22 451  
Earnings $ 11 $ 121 $ 51 $ (498)