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Employee Incentive and Retirement Plans - Schedule of Options Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock price ($ per share) $ 4.13  
Number of Options    
Outstanding (shares) 30,669,177  
Granted (shares) 0 7,482,011
Exercised (shares) (7,213,167)  
Forfeited/Expired (shares) (3,046,670)  
Outstanding (shares) 20,409,340 30,669,177
Vested and expected to vest (shares) 20,409,340  
Exercisable (shares) 16,471,522  
Weighted- Average Exercise Price Per Share    
Outstanding ($ per share) $ 4.79  
Granted ($ per share) 0.00 $ 7.22
Exercised ($ per share) 2.01  
Forfeited/Expired ($ per share) 8.09  
Outstanding ($ per share) 5.28 $ 4.79
Vested and expected to vest ($ per share) 5.28  
Exercisable ($ per share) $ 4.76  
Weighted-Average Remaining Contractual Life (in years)    
Outstanding at December 31, 2016 6 years  
Vested and expected to vest at December 31, 2017 6 years  
Exercisable at December 31, 2017 5 years 8 months 12 days  
Outstanding at December 31, 2016 $ 22,485  
Vested and expected to vest at December 31, 2017 22,485  
Exercisable at December 31, 2017 $ 22,485