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Shares Repurchased - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 11, 2018 | Apr. 24, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |
Repurchased common stock, value |  |  | $ 2,341,000 | $ 2,885,000 | $ 7,891,000
Total Leverage Ratio | 1.75 to 1.00 |  |  |  |
Three-Year Share Repurchase Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchased common stock, shares |  |  | 370,428 | 334,953 | 697,664
Repurchased common stock, value |  |  | $ 2,341,000 | $ 2,885,000 | $ 7,891,000
Dollar amount remaining available for future share repurchases |  |  | $ 83,389,000 |  |
Share repurchase program, extended term date |  | Apr. 27, 2022 |  |  |

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