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Restricted and Deferred Stock Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Number of Shares  
Beginning balance 12,815,911
Granted 5,231,437
Vested (5,350,073)
Forfeited (1,048,688)
Ending balance 11,648,587
Weighted-average grant date fair value per share  
Beginning balance $ 21.55
Granted $ 25.63
Vested $ 18.82
Forfeited $ 23.23
Ending balance $ 24.48