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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 06, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 894 | $ 2,299
Robert W. Baird Co. Inc [Member] | Sales Agreement [Member] | ATM Program [Member] | Maximum [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |
Common and Class B Common Stock | Non-Vested Restricted Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 3,250 | 5,361 | 3,250 | 11,693
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 894 | $ 1,265 | $ 894 | $ 2,299
Common and Class B Common Stock | Non-Vested Restricted Stock | Robert W. Baird Co. Inc [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Sale of stock number of shares issued in transaction |  |  |  | 0 |
Common Stock | Stock Option |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from the sale of Common stock |  | $ 2,094 | $ 6,573 | $ 9,940 | $ 11,978
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 2,965 | 6,582 | 2,965 | 11,455
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 863 | $ 1,490 | $ 863 | $ 2,343
Common Stock | Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from shares purchased under ESPP |  | $ 392 | $ 401 | $ 1,233 | $ 1,229
Common Stock | Class B Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Cash dividends paid per share of Common and Class B common stock |  | $ 1.95 | $ 1.775 | $ 5.675 | $ 5.15

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