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Employee Compensation Plans - Summarizes of Company's Non-Vested ESP/EIP Awards (Detail) (Restricted Stock [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares, Non-vested beginning of year 848,068  
Granted, Number of shares 506,470  
Vested, Number of shares (58,062)  
Forfeited or expired, Number of shares (49,000)  
Number of shares, Non-vested end of year 1,247,476 848,068
Weighted average fair value, Non-vested beginning of year $ 19.39  
Weighted average fair value, Granted $ 16.14  
Weighted average fair value, Vested $ 23.53  
Weighted average fair value, Forfeited or expired $ 20.39  
Weighted average fair value, Non-vested end of year $ 17.87 $ 19.39
Remaining contractual life, Non-vested beginning of year 2 years 2 years 3 months 18 days
Remaining contractual life, Granted 2 years 9 months 18 days  
Remaining contractual life, Vested 0 years  
Remaining contractual life, Forfeited or expired 0 years  
Remaining contractual life, Non-vested end of year 2 years 2 years 3 months 18 days