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Advances to and Investments in Foreign Joint Ventures' Operations - Schedule of Financial Information of Foreign Joint Ventures (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
BOMAY    
Assets:    
Total current assets $ 50,000 $ 47,700
Total non-current assets 3,457 3,589
Total assets 53,457 51,289
Liabilities and equity:    
Total liabilities 25,598 24,196
Total joint ventures’ equity 27,859 27,093
Total liabilities and equity 53,457 51,289
Revenue 26,168 33,468
Gross Profit 5,654 6,687
Earnings 1,084 2,010
MIEFE    
Assets:    
Total current assets 121 425
Total non-current assets 15 17
Total assets 136 442
Liabilities and equity:    
Total liabilities 198 551
Total joint ventures’ equity (62) (109)
Total liabilities and equity 136 442
Revenue 89 1,167
Gross Profit 23 481
Earnings $ 55 $ (631)