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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, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Liabilities and equity:                    
Gross profit $ 3,572 $ 2,867 $ 2,396 $ 2,980 $ 2,490 $ 1,689 $ 2,172 $ 1,772 $ 11,815 $ 8,123
BOMAY
                    
Assets:                    
Total current assets 94,220       91,926       94,220 91,926
Total non-current assets 5,122       5,116       5,122 5,116
Total assets 99,342       97,042       99,342 97,042
Liabilities and equity:                    
Total liabilities 72,644       73,293       72,644 73,293
Total joint ventures equity 26,698       23,749       26,698 23,749
Total liabilities and equity 99,342       97,042       99,342 97,042
Gross sales                 86,332 84,639
Gross profit                 12,130 14,348
Net income                 5,165 6,422
MIEFE
                    
Assets:                    
Total current assets 3,855       3,894       3,855 3,894
Total non-current assets 114       116       114 116
Total assets 3,969       4,010       3,969 4,010
Liabilities and equity:                    
Total liabilities 1,197       1,422       1,197 1,422
Total joint ventures equity 2,772       2,588       2,772 2,588
Total liabilities and equity 3,969       4,010       3,969 4,010
Gross sales                 7,997 6,996
Gross profit                 2,066 1,547
Net income                 279 39
AAG
                    
Assets:                    
Total current assets 2,572       2,241       2,572 2,241
Total non-current assets 1,550       776       1,550 776
Total assets 4,122       3,017       4,122 3,017
Liabilities and equity:                    
Total liabilities 1,291       1,511       1,291 1,511
Total joint ventures equity 2,831       1,505       2,831 1,505
Total liabilities and equity 4,122       3,016       4,122 3,016
Gross sales                 10,658 7,625
Gross profit                 4,282 2,965
Net income                 $ 1,721 $ 1,104