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Stock-Based Compensation Plans and Arrangements - Restricted Stock and Performance Stock Unit Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Non-vested, beginning balance 187,792
Granted, Shares 51,073
Vested, Shares (193,370)
Canceled, Shares (6,140)
Number of Shares, Non-vested, ending balance 39,355
Weighted Average Grant Date Fair Value, Non-vested, beginning balance $ 11.55
Granted, Weighted Average Grant Date Fair Value $ 17.91
Vested, Weighted Average Grant Date Fair Value $ 12.47
Canceled, Weighted Average Grant Date Fair Value $ 17.91
Weighted Average Grant Date Fair Value, Non-vested, ending balance $ 14.29
Restricted Stock Units and Performance Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Non-vested, beginning balance 4,473,464
Granted, Shares 2,457,570
Vested, Shares (1,730,669)
Canceled, Shares (73,478)
Number of Shares, Non-vested, ending balance 5,126,887
Weighted Average Grant Date Fair Value, Non-vested, beginning balance $ 15.49
Granted, Weighted Average Grant Date Fair Value $ 17.98
Vested, Weighted Average Grant Date Fair Value $ 15.32
Canceled, Weighted Average Grant Date Fair Value $ 16.52
Weighted Average Grant Date Fair Value, Non-vested, ending balance $ 16.72