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Share-based Compensation - Summary of Company's Stock Option Plan Activity (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Options outstanding, Beginning balance | shares 1,067,000
Number of Shares, Granted | shares 145,000
Number of Shares, Exercised | shares (266,000)
Number of Shares, Forfeited | shares (38,000)
Number of Shares, Options outstanding, Ending balance | shares 908,000
Number of Shares, Options exercisable | shares 788,000
Weighted Average Exercise Price Per Share, Options outstanding, Beginning balance | $ / shares $ 19.61
Weighted Average Exercise Price Per Share, Granted | $ / shares 18.90
Weighted Average Exercise Price Per Share, Exercised | $ / shares 17.73
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 27.28
Weighted Average Exercise Price Per Share, Options outstanding, Ending balance | $ / shares 19.73
Weighted Average Exercise Price Per Share, Options exercisable | $ / shares $ 19.60
Weighted Average Remaining Contractual Life (Years), Options outstanding 5 years 4 months 24 days
Weighted Average Remaining Contractual Life (Years), Options exercisable 4 years 9 months 18 days
Aggregate Intrinsic Value, Options outstanding | $ $ 9,308
Aggregate Intrinsic Value, Options exercisable | $ $ 8,194