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Stock-Based Compensation - Summary of Options Outstanding (Detail) - Stock options
shares in Thousands
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise prices, lower range limit $ 18.00
Exercise prices, upper range limit $ 2,026.00
Outstanding options (in shares) | shares 3,095
Weighted average remaining contractual life, outstanding options 4 years 4 months 27 days
Weighted average exercise price per share, outstanding options (in dollars per share) $ 20.23
Exercisable options (in shares) | shares 3,065
Weighted average exercise price per share, exercisable options (in dollars per share) $ 20.13
$18.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise prices, lower range limit 18.00
Exercise prices, upper range limit $ 18.00
Outstanding options (in shares) | shares 192
Weighted average remaining contractual life, outstanding options 7 years 1 month 20 days
Weighted average exercise price per share, outstanding options (in dollars per share) $ 18.00
Exercisable options (in shares) | shares 192
Weighted average exercise price per share, exercisable options (in dollars per share) $ 18.00
$20.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise prices, lower range limit 20.00
Exercise prices, upper range limit $ 20.00
Outstanding options (in shares) | shares 2,864
Weighted average remaining contractual life, outstanding options 4 years 2 months 5 days
Weighted average exercise price per share, outstanding options (in dollars per share) $ 20.00
Exercisable options (in shares) | shares 2,864
Weighted average exercise price per share, exercisable options (in dollars per share) $ 20.00
$28.44 - $2,026.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise prices, lower range limit 28.44
Exercise prices, upper range limit $ 2,026.00
Outstanding options (in shares) | shares 39
Weighted average remaining contractual life, outstanding options 8 years 1 month 1 day
Weighted average exercise price per share, outstanding options (in dollars per share) $ 47.86
Exercisable options (in shares) | shares 9
Weighted average exercise price per share, exercisable options (in dollars per share) $ 104.61