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Employee Benefit Plans Summary of All Employee Restricted Equity Award Activity (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Restricted Equity Awards      
Number of Shares      
Beginning of year 7,725,227 9,051,564 9,918,575
Add (deduct):      
Granted 1,870,660 2,489,976 3,542,984
Vested (2,422,700) (3,682,644) (4,228,673)
Forfeited (221,814) (133,669) (181,322)
End of year 6,951,373 7,725,227 9,051,564
Weighted Average Grant Date Fair Value      
Beginning of year $ 23.37 $ 21.27 $ 20.13
Granted 31.54 25.20 19.32
Vested 21.50 19.53 16.99
Forfeited 24.64 21.63 20.75
End of year $ 26.18 $ 23.37 $ 21.27
Unrecognized compensation cost related to unvested equity awards $ 86.4    
Period of recognition of compensation expense related to unvested equity awards 2 years 1 month    
Employee Stock Option      
Weighted Average Grant Date Fair Value      
Unrecognized compensation cost related to unvested equity awards $ 1.6 $ 2.9  
Period of recognition of compensation expense related to unvested equity awards 1 year 4 months 10 days 1 year 8 months 20 days  
Performance Shares | Employee Restricted Equity Awards      
Weighted Average Grant Date Fair Value      
Target shares 1,892,924