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Shares Repurchased - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 24, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |
Repurchased common stock, value |  | $ 31,197 | $ 2,341 | $ 2,885
Three-Year Share Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Repurchased common stock, shares |  | 8,234,324 | 370,428 | 334,953
Repurchased common stock, value |  | $ 31,197 | $ 2,341 | $ 2,885
Dollar amount remaining available for future share repurchases |  | $ 52,191 |  |
Share repurchase program, extended term date | Apr. 27, 2022 |  |  |

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