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STOCKHOLDERS' EQUITY: (Details 4)
 12 Months Ended
Dec. 31, 2011
Employee stock purchase plan
USD ($)
Y
Dec. 31, 2010
Employee stock purchase plan
USD ($)
Dec. 31, 2009
Employee stock purchase plan
USD ($)
Dec. 31, 2011
New Employee Stock Purchase Plan
USD ($)
Y
Dec. 31, 2010
New Employee Stock Purchase Plan
USD ($)
Dec. 31, 2010
New Employee Stock Purchase Plan
MXN
Information related to compensation cost            
Stock based compensation expenses $ 2,100,000 $ 2,100,000 $ 2,100,000      
Unrecognized compensation expenses $ 6,400,000     $ 3,800,000    
Period over which unrecognized compensation expense expected to be recognized (in years) 3     7    
Stock award activity, Shares            
Outstanding shares at the beginning of the period 10,920,693 11,556,625   3,901,901    
Granted (in shares)       51,923    
Exercised (in shares) (3,402,855)          
Forfeited (in shares) (247,497) (635,932)   (146,678)    
Outstanding shares at the end of the period 7,270,341 10,920,693 11,556,625 3,807,146 3,901,901 3,901,901
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the period (in dollars per share) $ 1.16 $ 1.16   $ 2.05    
Granted (in dollars per share)       $ 2.05    
Exercised (in dollars per share) $ 1.16          
Forfeited (in dollars per share) $ 1.16 $ 1.16   $ 2.05    
Outstanding shares at the end of the period (in dollars per share) $ 1.16 $ 1.16 $ 1.16 $ 2.05 $ 2.05  
Purchase price for initial subscription         $ 2.05 26.51