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Stock Incentive Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Installment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New grants of stock option | shares | 0 |  |
Outstanding options expiration period from the date of grant | 10 years |  |
Share-based compensation expense included in selling, general and administrative expenses | $ 3,400,000 | $ 7,200,000 | $ 5,500,000
Share-based compensation, income tax benefits | $ 800,000 | $ 1,300,000 | $ 1,500,000
2019 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares reserved for issuance | shares | 293,000 |  |
Percentage in payroll deductions to acquire shares | 15.00% |  |
Discount rate of fair market value available for share purchase | 85.00% |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding options exercisable period after date of grant | 10 years |  |
Weighted average fair value of stock options, granted | $ / shares |  |  | $ 36.41
Stock options granted with an exercise price below market price | shares | 0 | 0 | 0
Intrinsic value of stock options exercised | $ 4,100,000 | $ 3,800,000 | $ 2,500,000
Fair value of shares vested during the period | 43,000 | 312,000 | 312,000
Unrecognized compensation expense | $ 2,400,000 |  |
Weighted average remaining amortization period | 5 years 2 months 12 days |  |
Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding stock options vesting period | 8 years |  |
Stock Options [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding stock options vesting period | 4 years |  |
Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Outstanding options exercisable period after date of grant | 1 year |  |
Fair value of shares vested during the period | $ 3,800,000 | 5,800,000 | 4,000,000.0
Unrecognized compensation expense | $ 8,600,000 |  |
Weighted average remaining amortization period | 2 years 10 months 24 days |  |
Number of equal annual installments in which restricted stock units generally vest | Installment | 4 |  |
Performance Share Units (“PSUs”) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of shares vested during the period | $ 743,000 | $ 296,000 | $ 0
Vesting period | 3 years |  |
Maximum payout percentage | 200.00% |  |
Two Thousand And Twenty Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares reserved for issuance | shares | 375,000 |  |
Aggregate number of shares for which incentive stock options may be granted under the Plan | shares | 375,000 |  |
Two Thousand And Fifteen Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant | shares | 303,462 |  |

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