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Investments in Foreign Joint Ventures - Summary of Financial Information of Foreign Joint Ventures (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
BOMAY [Member]
          
Assets:          
Total current assets $ 102,245   $ 102,245   $ 91,926
Total non-current assets 5,057   5,057   5,116
Total assets 107,302   107,302   97,042
Liabilities and equity:          
Total liabilities 82,077   82,077   73,293
Total equity 25,225   25,225   23,749
Total liabilities and equity 107,302   107,302   97,042
Revenue 31,483 33,991 64,992 57,009  
Earnings 1,619 2,655 4,120 4,401  
MIEFE [Member]
          
Assets:          
Total current assets 4,498   4,498   3,894
Total non-current assets 134   134   116
Total assets 4,632   4,632   4,010
Liabilities and equity:          
Total liabilities 1,757   1,757   1,422
Total equity 2,875   2,875   2,588
Total liabilities and equity 4,632   4,632   4,010
Revenue 2,824 2,185 5,491 5,080  
Earnings 337 30 386 50  
AAG [Member]
          
Assets:          
Total current assets 4,353   4,353   2,241
Total non-current assets 860   860   775
Total assets 5,213   5,213   3,016
Liabilities and equity:          
Total liabilities 2,217   2,217   1,511
Total equity 2,996   2,996   1,505
Total liabilities and equity 5,213   5,213   3,016
Revenue 4,514 1,152 7,999 2,665  
Earnings $ 945 $ (39) $ 1,837 $ 90