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Employee Benefit Plans - Summary of Company's Stock Option (Detail) - USD ($)
$ / shares in Units, shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Granted 0 0
Stock Options Outstanding [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Beginning balance 3,068  
Number of Shares, Granted 0  
Number of Shares, Options exercised (801)  
Number of Shares, Forfeited 0  
Number of Shares, Canceled or expired (379)  
Number of Shares, Ending balance 1,888 3,068
Weighted Average Exercise Price, Beginning balance $ 5.76  
Weighted Average Exercise Price, Granted 0.00  
Weighted Average Exercise Price, Options exercised 5.40  
Weighted Average Exercise Price, Forfeited 0.00  
Weighted Average Exercise Price, Canceled or Expired 6.14  
Weighted Average Exercise Price, Ending balance $ 5.83 $ 5.76
Weighted Average Remaining Contractual Term 1 year 9 months 18 days  
Aggregate Intrinsic Value $ 3,715,500  
Vested and expected to vest, number of shares 1,888  
Vested and expected to vest, Weighted Average Exercise Price (per share) $ 5.83  
Vested and expected to vest, Weighted Average Remaining Contractual Term (years) 1 year 9 months 18 days  
Vested and Expected to Vest, Aggregate Intrinsic Value $ 3,715,500  
Exercisable, Number of shares 1,888  
Exercisable, Weighted Average Exercise Price $ 5.83  
Exercisable, Weighted Average Remaining Contractual Term (Years) 1 year 9 months 18 days  
Exercisable, Aggregate Intrinsic Value $ 3,715,500