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Summary of Nonvested Performance-Based Restricted Stock Grants (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Nonvested Restricted Shares and Units - Number of Shares  
Unvested at December 31, 2013 2,028,669
Nonvested Restricted Shares and Units - Weighted Average Grant Date Fair Value  
Unvested at December 31, 2013 $ 51.64 [1]
Performance Based Restricted Stock and Restricted Stock Units
 
Nonvested Restricted Shares and Units - Number of Shares  
Unvested at December 31, 2012 2,568,588
Granted 398,086
Vested 0
Forfeitures (938,005)
Unvested at December 31, 2013 2,028,669
Nonvested Restricted Shares and Units - Weighted Average Grant Date Fair Value  
Unvested at December 31, 2012 $ 48.26
Granted $ 46.49
Vested $ 0.00
Forfeitures $ 40.40
Unvested at December 31, 2013 $ 51.55
[1] Amount shown is the weighted average grant date fair value of performance shares and restricted stock units granted, net of forfeitures.