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Share-Based Compensation and Other Employee Benefit Plans - Summary of the Activity in the Stock Option Plan (Detail)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Shares  
Outstanding at beginning of period (in shares) | shares 57
Exercised (in shares) | shares (16)
Outstanding at end of period (in shares) | shares 41
Options exercisable at end of year, Shares (in shares) | shares 41
Weighted Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 4.11
Exercised (in dollars per share) | $ / shares 3.76
Outstanding at end of period (in dollars per share) | $ / shares 4.24
Options exercisable at end of year, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 4.24
Outstanding at end of period, Weighted Average Remaining Contractual Term in Years 1 year 4 months 6 days
Options exercisable at end of year, Weighted Average Remaining Contractual Terms in Years 1 year 4 months 6 days
Outstanding at end of period, Aggregate Intrinsic Value | $ $ 509,800
Options exercisable at end of year, Aggregate Intrinsic Value | $ $ 509,800