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Changes in Nonvested Stock Options (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted-average grant-date fair value per share      
Granted $ 11.54 $ 15.26 $ 14.45
Unvested Options
     
Share      
Nonvested stock options outstanding, at beginning of the year 5,348,347    
Granted 1,744,446    
Vested (2,027,193)    
Forfeited or Cancelled (99,570)    
Nonvested stock options outstanding, at end of the year 4,966,030    
Weighted-average grant-date fair value per share      
Nonvested stock options weighted average grant date fair value at beginning of the year $ 15.48    
Granted $ 11.54    
Vested $ 15.81    
Forfeited or Cancelled $ 13.65    
Nonvested stock options weighted average grant date fair value at end of the year $ 14.00