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Summary of Nonvested Restricted Stock Grants (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Nonvested Restricted Shares and Units - Number of Shares and Units  
Nonvested at December 31, 2012 2,568,588
Nonvested Restricted Shares and Units - Weighted Average Grant Date Fair Value  
Nonvested at December 31, 2012 $ 46.51 [1]
Restricted Stock and Restricted Stock Units
 
Nonvested Restricted Shares and Units - Number of Shares and Units  
Nonvested at December 31, 2011 99,462
Granted 456,930
Vested (26,944)
Forfeitures (1,509)
Nonvested at December 31, 2012 527,939
Nonvested Restricted Shares and Units - Weighted Average Grant Date Fair Value  
Nonvested at December 31, 2011 $ 18.07
Granted $ 48.60
Vested $ 19.99
Forfeitures $ 66.27
Nonvested at December 31, 2012 $ 44.26
[1] Amount shown is the weighted average grant date fair value of shares and units granted, net of forfeitures.