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Investments in Foreign Joint Venture - Schedule of Activity in Investment in Foreign Joint Ventures (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Undistributed earnings:    
Dividend distributions $ (96) $ (672)
Foreign currency translation:    
Total investment in BOMAY at June 30, 2019 9,889  
BOMAY    
Investments in BOMAY*    
Balance at the beginning of the year 2,033  
Undistributed earnings:    
Balance at beginning of year 7,793  
Equity in earnings 703  
Dividend distributions (799)  
Balance at end of period 7,697  
Foreign currency translation:    
Balance at beginning of year 154  
Change during the period 5  
Balance at end of period 159  
Total investment in BOMAY at June 30, 2019 $ 9,889