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Stock-Based Compensation - Schedule of Outstanding Stock Options (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding options, Number of shares | shares 37,249
Outstanding options, Weighted average remaining contractual life (years) 1 year 8 months 20 days
Outstanding options, Weighted-average exercise price (in dollars per share) $ 82.06
Exercisable options, Number of shares | shares 37,249
Exercisable options, Weighted-average exercise price (in dollars per share) $ 82.06
$28.56 to $54.22 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range (in dollars per share) 28.56
Exercise price upper range (in dollars per share) $ 54.22
Outstanding options, Number of shares | shares 1,631
Outstanding options, Weighted average remaining contractual life (years) 2 years 10 months 17 days
Outstanding options, Weighted-average exercise price (in dollars per share) $ 35.83
Exercisable options, Number of shares | shares 1,631
Exercisable options, Weighted-average exercise price (in dollars per share) $ 35.83
$80.84 to $81.23 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range (in dollars per share) 80.84
Exercise price upper range (in dollars per share) $ 81.23
Outstanding options, Number of shares | shares 21,183
Outstanding options, Weighted average remaining contractual life (years) 1 year 2 months 16 days
Outstanding options, Weighted-average exercise price (in dollars per share) $ 81.13
Exercisable options, Number of shares | shares 21,183
Exercisable options, Weighted-average exercise price (in dollars per share) $ 81.13
$88.56 to $89.23 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price lower range (in dollars per share) 88.56
Exercise price upper range (in dollars per share) $ 89.23
Outstanding options, Number of shares | shares 14,435
Outstanding options, Weighted average remaining contractual life (years) 2 years 4 months 6 days
Outstanding options, Weighted-average exercise price (in dollars per share) $ 88.63
Exercisable options, Number of shares | shares 14,435
Exercisable options, Weighted-average exercise price (in dollars per share) $ 88.63