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Shareholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 23, 2017 | Sep. 30, 1999
Stockholders Equity Note [Line Items] |  |  |  |  |
Preferred stock outstanding | 0 | 0 |  |  |
Maximum aggregate offering price under sales agreement |  |  |  | $ 250,000 |
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 |  |  |  |

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