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Stock-Based Compensation - Schedule of Outstanding Stock Options (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding options, number of shares | shares 19,066
Outstanding options, weighted average remaining contractual life (years) 1 year 2 months 12 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 82.01
Exercisable options, number of shares | shares 19,066
Exercisable options, weighted-average exercise price (in dollars per share) $ 82.01
$28.56 to $54.22  
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 1,585
Outstanding options, weighted average remaining contractual life (years) 1 year 10 months 21 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 35.55
Exercisable options, number of shares | shares 1,585
Exercisable options, weighted-average exercise price (in dollars per share) $ 35.55
$80.84 to $88.56  
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 17,481
Outstanding options, weighted average remaining contractual life (years) 1 year 1 month 21 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 86.22
Exercisable options, number of shares | shares 17,481
Exercisable options, weighted-average exercise price (in dollars per share) $ 86.22