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Preferred and Common Stock - Schedule of Activity for Stock Options and Stock Awards (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Number of options, Exercised (in shares) (8,900)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of awards, Outstanding beginning of year (in shares) 8,000
Number of awards, Granted (in shares) 3,000
Number of awards, Exercised (in shares) 0
Number of awards, Converted (in shares) (2,000)
Number of awards, Expired or forfeited (in shares) (2,000)
Number of awards, Performance share adjustment (in shares) 0
Number of awards, Outstanding end of year (in shares) 7,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted average FMV per award, Outstanding beginning of year (in usd per share) | $ / shares $ 22.26
Weighted average FMV per award, Granted (in usd per share) | $ / shares 21.86
Weighted average FMV per award, Exercised (in usd per share) | $ / shares 0.00
Weighted average FMV per award, Converted (in usd per share) | $ / shares 24.95
Weighted average FMV per award, Expired or forfeited (in usd per share) | $ / shares 21.26
Weighted average FMV per award, Performance share adjustment (in usd per share) | $ / shares 21.48
Weighted average FMV per award, Outstanding, end of year (in usd per share) | $ / shares $ 21.49
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Number of options, Outstanding beginning of year (in shares) 13,000
Number of options, Granted (in shares) 2,000
Number of options, Exercised (in shares) (2,000)
Number of options, Converted (in shares) 0
Number of options, Expired or forfeited (in shares) (2,000)
Number of options, Performance share adjustment (in shares) 0
Number of options, Outstanding end of year (in shares)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price, Outstanding beginning of year (in usd per share) | $ / shares $ 24.14
Weighted average exercise price, granted (in usd per share) | $ / shares 21.13
Weighted average exercise price, exercised (in usd per share) | $ / shares 20.65
Weighted average exercise price, Converted (in usd per share) | $ / shares 0.00
Weighted average exercise price, expired or forfeited (in usd per share) | $ / shares 25.99
Weighted average exercise price, Performance share adjustment (in usd per share) | $ / shares 0.00
Weighted average exercise price Outstanding, end of year (in usd per share) | $ / shares $ 23.94