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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Investments in foreign joint ventures:        
Balance at December 31, 2012     $ 11,408  
Equity in earnings (loss) in 2013 434 746 3,140 2,571
Repayment of advances     (179)  
Dividend distributions in 2013     (1,343)  
Foreign currency translation adjustment     62  
Investments, end of period 13,088   13,088  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 2,101   2,101  
Undistributed earnings 9,613   9,613  
Foreign currency translation 1,374   1,374  
Investments, end of period 13,088   13,088  
BOMAY [Member]
       
Investments in foreign joint ventures:        
Balance at December 31, 2012     9,531  
Equity in earnings (loss) in 2013     2,123  
Repayment of advances         
Dividend distributions in 2013     (1,320)  
Foreign currency translation adjustment     212  
Investments, end of period 10,546   10,546  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 2,033   2,033  
Undistributed earnings 7,203   7,203  
Foreign currency translation 1,310   1,310  
Investments, end of period 10,546   10,546  
MIEFE [Member]
       
Investments in foreign joint ventures:        
Balance at December 31, 2012     1,063  
Equity in earnings (loss) in 2013     146  
Repayment of advances         
Dividend distributions in 2013         
Foreign currency translation adjustment     (29)  
Investments, end of period 1,180   1,180  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 15   15  
Undistributed earnings 901   901  
Foreign currency translation 264   264  
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     871  
Repayment of advances     (179)  
Dividend distributions in 2013     (23)  
Foreign currency translation adjustment     (121)  
Investments, end of period 1,362   1,362  
Components of investments in foreign joint ventures:        
Investment in foreign joint ventures 53   53  
Undistributed earnings 1,509   1,509  
Foreign currency translation (200)   (200)  
Investments, end of period $ 1,362   $ 1,362