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Stockholders' Equity (Common Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 02, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 13, 2020 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock repurchased and retired, total costs |  | $ 12 |  | $ 1,338 | $ 1,023 |  |
Dividends per common share | $ 0.40 |  |  |  |  |  |
Dividends, date of record | Aug. 21, 2020 |  |  |  |  |  |
Dividends. date of payable | Sep. 18, 2020 |  |  |  |  |  |
Share Repurchase Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock repurchase authorized amount |  |  |  |  |  | $ 20,000 | $ 20,000
Common stock repurchased and retired, weighted average price, excluding fees and commissions |  | $ 43.76 | $ 40.99 | $ 39.93 | $ 41.28 |  |
Stock repurchased and retired, total costs |  | $ 20 | $ 7,185 | $ 5,161 | $ 15,191 |  |
Common stock repurchased and retired, weighted average price, including fees and commissions |  | $ 43.79 | $ 41.02 | $ 39.96 | $ 41.31 |  |
Common Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  | 225 |  | 29,698 | 24,849 |  |
Common Stock [Member] | Share Repurchase Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchase and retirement of common stock, shares |  | 457 | 175,160 | 129,142 | 367,736 |  |

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