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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | 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 |  |  |
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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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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