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Stock-Based Compensation - Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Number of Shares    
Number of Shares, Beginning Balance 1,881  
Number of Shares, Granted 1,219  
Number of Shares, Vested (271)  
Number of Shares, Forfeited (111)  
Non-vested number of shares, Ending Balance 2,718 1,881
Units expected to vest at March 31, 2020 2,718  
Weighted average grant date Fair Value    
Weighted average grant date fair value, Beginning balance $ 23.08  
Weighted average grant date fair value, Granted 25.39  
Weighted average grant date fair value, Vested 26.41  
Weighted average grant date fair value, Forfeited 22.98  
Weighted average grant date fair value, Ending balance 23.79 $ 23.08
Weighted average grant date fair value, Units expected to vest $ 23.79  
Weighted-Average Remaining Contractual Term (In years)    
Weighted-Average Remaining Contractual Term, Balances 1 year 9 months 18 days 1 year 7 months 6 days
Weighted-Average Remaining Contractual Term, Units expected to vest 1 year 9 months 18 days  
Aggregate intrinsic value    
Aggregate intrinsic value, Balances $ 41,361 $ 44,386
Aggregate intrinsic value, Units expected to vest $ 41,361