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Stock-Based Compensation Plans - Schedule of Non-Vested Restricted Stock Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Time Based Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value Non-vested, Beginning balance $ 38.88    
Weighted average grant date fair value, Granted 47.34 $ 43.31 $ 33.46
Weighted average grant date fair value, Vested 38.42    
Weighted average grant date fair value, Forfeited 41.91    
Weighted average grant date fair value Non-vested, Ending balance $ 42.98 $ 38.88  
Shares Non-vested, Beginning balance 875,326    
Shares, Granted 500,943 428,333 420,368
Shares, Vested (272,877)    
Shares, Forfeited (139,923)    
Shares Non-vested, Ending balance 963,469 875,326  
Performance Based Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value Non-vested, Beginning balance      
Weighted average grant date fair value, Granted $ 49.20    
Weighted average grant date fair value, Forfeited 49.20    
Weighted average grant date fair value Non-vested, Ending balance $ 49.20    
Shares Non-vested, Beginning balance      
Shares, Granted 89,143    
Shares, Forfeited (16,143)    
Shares Non-vested, Ending balance 73,000