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Share-based Compensation Plans - Activity Related to PCSUs and Restricted Stock Units (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Performance Contingent Restricted Stock Units And Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance 1,442,884  
Granted 252,860  
Performance adjustments (324,346)  
Converted (167,420)  
Dividend equivalents 16,132  
Ending Balance 1,220,110 1,442,884
Beginning Balance, weighted-average grant date fair value $ 31.55  
Granted, weighted-average grant date fair value 42.91  
Performance adjustments, weighted-average grant date fair value 32.54  
Converted, weighted-average grant date fair value 30.36  
Dividend equivalents, weighted-average grant date fair value 43.45  
Ending Balance, weighted-average grant date fair value $ 34.15 $ 31.55
Performance Contingent Restricted Stock Units And Restricted Stock Units | Nonvested    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance 911,388  
Granted 250,811  
Performance adjustments (318,709)  
Vested (324,444)  
Dividend equivalents 3,744  
Ending Balance 522,790 911,388
Performance Contingent Restricted Stock Units And Restricted Stock Units | Vested    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance 531,496  
Granted 2,049  
Performance adjustments (5,637)  
Vested (324,444)  
Converted (167,420)  
Dividend equivalents 12,388  
Ending Balance 697,320 531,496
Two Thousand And Twelve Plan | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 105 $ 4,059
Two Thousand and Thirteen | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value 2,687  
Two Thousand and Eleven [Member] | Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 640 $ 1,955
Executives and Directors | Restricted Stock Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted 79,787  
Vested (46,386)