XML 77 R51.htm IDEA: XBRL DOCUMENT v2.4.0.6
Summary of Nonvested Performance-Based Restricted Stock Grants (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Nonvested Restricted Shares and Units - Number of Shares  
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]
Performance Based Restricted Stock and Restricted Stock Units
 
Nonvested Restricted Shares and Units - Number of Shares  
Nonvested at December 31, 2011 3,445,251
Granted 339,453
Vested (1,095,134)
Forfeitures (120,982)
Nonvested at December 31, 2012 2,568,588
Nonvested Restricted Shares and Units - Weighted Average Grant Date Fair Value  
Nonvested at December 31, 2011 $ 47.56
Granted $ 48.66
Vested $ 46.35
Forfeitures $ 46.55
Nonvested at December 31, 2012 $ 48.26
[1] Amount shown is the weighted average grant date fair value of shares and units granted, net of forfeitures.