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Stock-Based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Equity Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Beginning Balance 360,415  
Granted 586,311 355,000
Vested (338,327)  
Forfeited (28,994)  
Outstanding, Ending Balance 579,405  
Outstanding, Beginning Balance, weighted average grant date fair value $ 79.60  
Granted, weighted average grant date fair value 52.35 $ 84.96
Vested, weighted average grant date fair value 66.30  
Forfeited, weighted average grant date fair value 64.88  
Outstanding, Ending Balance, weighted average grant date fair value $ 60.53  
Restricted Stock Liability Awards    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Beginning Balance 304,504  
Granted 342,495  
Vested (260,622)  
Forfeited (8,294)  
Outstanding, Ending Balance 378,083  
Outstanding, Beginning Balance, weighted average grant date fair value $ 80.33  
Granted, weighted average grant date fair value 56.01  
Vested, weighted average grant date fair value 68.39  
Forfeited, weighted average grant date fair value 74.22  
Outstanding, Ending Balance, weighted average grant date fair value $ 66.67