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Aggregate Maturities For All Long-Term Borrowings (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
2013 $ 1,283,355  
2014 971,740  
2015 440,785  
2016 59,069  
Thereafter 209,208  
Long-term Debt Total $ 2,964,157 $ 2,775,441