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Investments in Foreign Joint Ventures - Schedule of Financial Information of Foreign Joint Ventures (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Liabilities and equity:          
Gross profit $ 495 $ 2,759 $ 4,958 $ 7,613  
Earnings (2,089) 901 (3,003) 3,617  
BOMAY
          
Assets:          
Total current assets 77,458   77,458   94,220
Total non-current assets 4,788   4,788   5,122
Total assets 82,246   82,246   99,342
Liabilities and equity:          
Total liabilities 53,749   53,749   72,644
Total joint ventures’ equity 28,497   28,497   26,698
Total liabilities and equity 82,246   82,246   99,342
Revenue 9,995 17,995 67,209 82,986  
Gross profit 2,353 2,853 9,812 10,451  
Earnings 712 1,187 4,483 5,308  
MIEFE
          
Assets:          
Total current assets 3,932   3,932   3,855
Total non-current assets 126   126   114
Total assets 4,058   4,058   3,969
Liabilities and equity:          
Total liabilities 2,533   2,533   1,197
Total joint ventures’ equity 1,525   1,525   2,772
Total liabilities and equity 4,058   4,058   3,969
Revenue 1,359 1,530 4,571 7,021  
Gross profit 567 372 1,686 1,659  
Earnings 158 (29) 339 356  
AAG
          
Assets:          
Total current assets         2,572
Total non-current assets         1,550
Total assets         4,122
Liabilities and equity:          
Total liabilities         1,291
Total joint ventures’ equity         2,831
Total liabilities and equity         4,122
Revenue   1,434 1,078 9,433  
Gross profit   259 154 3,691  
Earnings   $ (59) $ 4 $ 1,777