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Stock-Based Compensation - Schedule of Outstanding Stock Options (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding options, number of shares | shares 6,303
Outstanding options, weighted average remaining contractual life (years) 6 months 26 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 78.97
Exercisable options, number of shares | shares 6,303
Exercisable options, weighted-average exercise price (in dollars per share) $ 78.97
$28.56 to $28.56  
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) $ 28.56
Outstanding options, number of shares | shares 1,007
Outstanding options, weighted average remaining contractual life (years) 1 year 2 months 5 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 28.56
Exercisable options, number of shares | shares 1,007
Exercisable options, weighted-average exercise price (in dollars per share) $ 28.56
$88.56 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) $ 88.56
Outstanding options, number of shares | shares 5,296
Outstanding options, weighted average remaining contractual life (years) 5 months 12 days
Outstanding options, weighted-average exercise price (in dollars per share) $ 88.56
Exercisable options, number of shares | shares 5,296
Exercisable options, weighted-average exercise price (in dollars per share) $ 88.56