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Investments in Foreign Joint Ventures - Summary of Activity in AEIT's Investment in 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
Investments in foreign joint ventures:        
Balance at December 31, 2012     $ 11,408  
Equity in earnings (loss) in 2013 1,248 1,054 2,706 1,825
Repayment of advances     (83)  
Dividend distributions in 2013     (1,212)  
Foreign currency translation adjustment     (78)  
Investments, end of period 12,741   12,741  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 2,198   2,198  
Undistributed earnings 9,310   9,310  
Foreign currency translation 1,233   1,233  
Investments, end of period 12,741   12,741  
BOMAY [Member]
       
Investments in foreign joint ventures:        
Balance at December 31, 2012     9,531  
Equity in earnings (loss) in 2013     1,648  
Repayment of advances         
Dividend distributions in 2013     (1,189)   
Foreign currency translation adjustment     102  
Investments, end of period 10,092   10,092  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 2,033   2,033  
Undistributed earnings 6,859   6,859  
Foreign currency translation 1,200   1,200  
Investments, end of period 10,092   10,092  
MIEFE [Member]
       
Investments in foreign joint ventures:        
Balance at December 31, 2012     1,063  
Equity in earnings (loss) in 2013     158  
Repayment of advances         
Dividend distributions in 2013         
Foreign currency translation adjustment     (41)  
Investments, end of period 1,180   1,180  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 14   14  
Undistributed earnings 913   913  
Foreign currency translation 253   253  
Investments, end of period 1,180   1,180  
AAG [Member]
       
Investments in foreign joint ventures:        
Balance at December 31, 2012     814  
Equity in earnings (loss) in 2013     900  
Repayment of advances     (83)  
Dividend distributions in 2013     (23)  
Foreign currency translation adjustment     (139)  
Investments, end of period 1,469   1,469  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 150   150  
Undistributed earnings 1,538   1,538  
Foreign currency translation (219)   (219)  
Investments, end of period $ 1,469   $ 1,469