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Stock-Based Compensation - Stock Incentive Plans Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Shares purchased pursuant to ESPP [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Outstanding, Beginning balance | shares 4,343,825
Options, Granted | shares 1,794,763
Options, Forfeited | shares (378,509)
Options, Expired | shares (115,745)
Options, Exercised | shares (248,574)
Options, Outstanding, Ending balance | shares 5,395,760
Options, Exercisable, December 31, 2015 | shares 3,004,907
Options, vested and expected to vest after December 31, 2015 | shares 5,093,188
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted average exercise price, Beginning balance | $ / shares $ 14.21
Weighted average exercise price, Granted | $ / shares 13.34
Weighted average exercise price, Forfeited | $ / shares 16.97
Weighted average exercise price, Expired | $ / shares 17.49
Weighted average exercise price, Exercised | $ / shares 9.69
Weighted average exercise price, Ending balance | $ / shares 13.87
Weighted average exercise price, Exercisable, December 31, 2015 | $ / shares 13.00
Weighted average exercise price, Expected to vest after December 31, 2015 | $ / shares $ 13.85
Intrinsic value, Outstanding | $ $ 1,512
Intrinsic value, Exercisable, December 31, 2015 | $ 1,512
Intrinsic value, Expected to vest after December 31, 2015 | $ $ 1,512
Weighted average remaining contractual term (in years), Outstanding 4 years 4 months
Weighted average remaining contractual term (in years), Exercisable, December 31, 2015 3 years
Weighted average remaining contractual term (in years), Expected to vest after December 31, 2015 4 years 2 months
Restricted stock units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Stock units, Outstanding, Beginning balance | shares 753,422
Stock units, Granted | shares 837,419
Stock units, Forfeited | shares (200,676)
Stock units, Vested | shares (382,066)
Stock units, Outstanding, Ending balance | shares 1,008,099
Stock units, Expected to vest after December 31, 2015 | shares 863,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted average grant date fair value, Outstanding, Beginning balance | $ / shares $ 17.88
Weighted average grant date fair value, Granted | $ / shares 13.67
Weighted average grant date fair value, Forfeited | $ / shares 16.55
Weighted average grant date fair value, Vested | $ / shares 17.65
Weighted average grant date fair value, Outstanding, Ending balance | $ / shares 14.73
Weighted average grant date fair value, Expected to vest after December 31, 2015 | $ / shares $ 14.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract]  
Intrinsic value, Outstanding | $ $ 9,879
Intrinsic value, Expected to vest after December 31, 2015 | $ $ 8,461
Weighted average remaining contractual term (in years), Outstanding 1 year
Weighted average remaining contractual term (in years), Expected to vest after December 31, 2015 11 months