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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Liabilities and equity:          
Gross profit $ 2,028 $ 2,089 $ 4,463 $ 4,854  
Earnings (1,408) 1,063 (914) 2,716  
BOMAY
          
Assets:          
Total current assets 85,660   85,660   94,220
Total non-current assets 4,914   4,914   5,122
Total assets 90,574   90,574   99,342
Liabilities and equity:          
Total liabilities 62,879   62,879   72,644
Total joint ventures’ equity 27,695   27,695   26,698
Total liabilities and equity 90,574   90,574   99,342
Revenue 37,611 31,483 57,214 64,992  
Gross profit 4,524 3,309 7,459 7,597  
Earnings 2,400 1,619 3,771 4,120  
MIEFE
          
Assets:          
Total current assets 3,498   3,498   3,855
Total non-current assets 124   124   114
Total assets 3,622   3,622   3,969
Liabilities and equity:          
Total liabilities 2,227   2,227   1,197
Total joint ventures’ equity 1,395   1,395   2,772
Total liabilities and equity 3,622   3,622   3,969
Revenue 2,388 2,824 3,212 5,491  
Gross profit 760 805 1,119 1,287  
Earnings 275 337 181 386  
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 297 4,514 1,078 7,999  
Gross profit 44 1,876 154 3,432  
Earnings $ 77 $ 945 $ 4 $ 1,837