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Stock-Based Compensation - Summary of Activity in Corporation's Active Stock Plans (Detail) - $ / shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Shares Available for Grant 1,973,427  
Authorized, Shares Available for Grant 515,000  
Granted, Shares Available for Grant (6,576)  
Stock options exercised, Shares Available for Grant 0  
Stock awards vested, Shares Available for Grant 0  
Forfeited, Shares Available for Grant 20,482  
Canceled, Shares Available for Grant (11,309)  
Expired, Shares Available For Grant 0  
Ending Balance, Shares Available for Grant 2,491,024  
Beginning Balance, Director Deferred Stock Units Outstanding 38,867  
Granted, Director Deferred Stock Units Outstanding 6,576  
Stock options exercised, Director Deferred Stock Units Outstanding 0  
Stock awards vested, Director Deferred Stock Units Outstanding 0  
Forfeited, Director Deferred Stock Units Outstanding 0  
Canceled, Director Deferred Stock Units Outstanding 0  
Expired, Director Deferred Stock Units Outstanding 0  
Ending Balance, Director Deferred Stock Units Outstanding 45,443  
Stock options exercised, Number of Shares (227,851) (491,675)
Non-Vested Stock Awards/Stock Units Outstanding [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 175,490  
Granted, Number of Shares 0  
Stock options exercised, Number of Shares 0  
Stock awards vested, Number of Shares 0  
Forfeited, Number of Shares 0  
Canceled, Number of Shares 0  
Expired, Number of Shares 0  
Ending Balance, Number of Shares 175,490  
Beginning Balance, Weighted-Average Grant-Date Fair Value $ 60.55  
Granted, Weighted-Average Grant-Date Fair Value 0  
Stock awards vested, Weighted-Average Grant-Date Fair Value 0  
Forfeited, Weighted-Average Grant-Date Fair Value 0  
Canceled, Weighted-Average Grant-Date Fair Value 0  
Expired, Weighted Average Grant Date Fair Value 0.00  
Ending Balance, Weighted-Average Grant-Date Fair Value $ 60.55  
Stock Options Outstanding [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Beginning Balance, Number of Shares 5,029,882  
Granted, Number of Shares 0  
Stock options exercised, Number of Shares (227,851)  
Stock awards vested, Number of Shares 0  
Forfeited, Number of Shares (20,482)  
Canceled, Number of Shares 0  
Expired, Number of Shares (774)  
Ending Balance, Number of Shares 4,780,775  
Beginning Balance, Weighted-Average Exercise Price $ 58.99  
Granted, Weighted-Average Exercise Price 0.00  
Stock option Exercised Weighted Average Exercise Price 51.92  
Stock awards vested, Weighted-Average Exercise Price 0  
Forfeited, Weighted-Average Exercise Price 66.54  
Expired, Weighted-Average Exercise Price 71.39  
Ending Balance, Weighted-Average Exercise Price $ 59.29