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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 06, 2021 | Aug. 23, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 1999
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Preferred stock outstanding |  |  | 0 | 0 |  |
Number of shares authorized to be repurchased |  |  |  |  |  | 7,500,000
Treasury stock, shares repurchased |  |  | 0 | 0 | 0 |
Cost of repurchased shares |  |  | $ 114,425 | $ 114,425 | $ 114,425 |
Remaining number of shares authorized to be repurchased |  |  | 1,129,087 |  |  |
Common stock issued into escrow |  | 23,230 |  |  |  |
Robert W. Baird & Co. Inc [Member] | ATM Program [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |  |
Number of shares sold under ATM |  |  | 0 |  |  |
Class B Common Stock |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Amount of votes common stock is entitled |  |  | ten |  |  |
Treasury stock, shares repurchased |  |  | 48,263 | 48,263 | 48,263 |
Common Stock |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Amount of votes common stock is entitled |  |  | one |  |  |
Percentage of Board entitled to elect |  |  | 25.00% |  |  |
Treasury stock, shares repurchased |  |  | 6,322,650 | 6,322,650 | 6,322,650 |

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