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Stock-based Compensation and Outstanding Awards - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Options, Outstanding, Beginning balance | shares 5,483,000
Stock Options, Granted | shares 521,000
Stock OptionsForfeited and Expired | shares (613,000)
Stock Options, Exercised | shares (265,000)
Stock Options, Outstanding, Ending balance | shares 5,126,000
Stock Options, Exercisable at December 31, 2019 | shares 3,701,000
Weighted average exercise price, Outstanding, Beginning balance | $ / shares $ 19.43
Weighted average exercise price, Granted | $ / shares 15.30
Weighted average excercise price, Forfeited and Expired | $ / shares 14.19
Weighted average exercise price, Exercised | $ / shares 10.30
Weighted average exercise price, Outstanding, Ending balance | $ / shares 20.11
Weighted average exercise price, Exercisable at December 31, 2019 | $ / shares $ 22.88
Weighted average remaining contractual term, Outstanding, Ending balance 3 years 3 months 18 days
Weighted average remaining contractual term, Exercisable at December 31, 2019 2 years 7 months 6 days
Aggregate intrinsic value, Outstanding, Ending balance | $ $ 2