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Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)
 6 Months Ended
Jun. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options outstanding at beginning of period (in shares) | shares 128,500
Options granted (in shares) | shares 0
Options exercised (in shares) | shares (1,675)
Options forfeited (in shares) | shares 0
Options outstanding at end of period (in shares) | shares 126,825
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted Average Exercise Price at beginning of period (in USD per share) | $ / shares $ 17.72
Weighted Average Exercise Price of Options Granted (in USD per share) | $ / shares 0
Weighted Average Exercise Price of Options Exercised (in USD per share) | $ / shares 16.59
Weighted Average Exercise Price of Options Forfeited (in USD per share) | $ / shares 0
Weighted Average Exercise Price at end of period (in USD per share) | $ / shares $ 17.74