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Short-term borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Advances from financial institutions:    
At fixed interest rates $ 1,181,133 $ 1,005,357
At floating interest rates 267,890 318,109
Total short-term borrowings 1,449,023 1,323,466
Average outstanding balance during the year 967,629 1,100,059
Maximum balance at any month-end 1,449,023 1,323,466
Weighted average interest rate at end of the year 1.48% 1.84%
Weighted average interest rate during the year 1.79% 1.22%
Euros [Member]
    
Advances from financial institutions:    
Total short-term borrowings 39,633 38,850
Range of fixed interest rates on borrowings 0.70% 2.98%
Peso [Member]
    
Advances from financial institutions:    
Total short-term borrowings 43,890 93,109
Range of floating interest rates on borrowings   5.70%
Renminbis [Member]
    
Advances from financial institutions:    
Total short-term borrowings 0 10,307
Range of fixed interest rates on borrowings 0.00% 6.65%
U S Dollar [Member]
    
Advances from financial institutions:    
Total short-term borrowings $ 1,365,500 $ 1,181,200
Maximum [Member]
    
Advances from financial institutions:    
Range of fixed interest rates on borrowings 1.92% 2.64%
Range of floating interest rates on borrowings 1.99% 2.01%
Maximum [Member] | Peso [Member]
    
Advances from financial institutions:    
Range of floating interest rates on borrowings 5.25%  
Minimum [Member]
    
Advances from financial institutions:    
Range of fixed interest rates on borrowings 0.75% 0.84%
Range of floating interest rates on borrowings 1.06% 1.11%
Minimum [Member] | Peso [Member]
    
Advances from financial institutions:    
Range of floating interest rates on borrowings 5.14%