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Stock-Based Compensation (Restricted Stock Awards) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Declared dividends charged to earnings |  |  |  | $ 237 |
Other Operating Income (Expense) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Declared dividends charged to earnings |  | $ 10 |  | 67 |
General and Administrative Personnel Expense [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Declared dividends charged to earnings |  |  |  | 170 |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Recognized compensation expenses | $ 1,862 | $ 1,524 | $ 5,142 | $ 4,047 |
Total unrecognized compensation expense, Nonvested restricted stock arrangements granted | $ 15,658 |  | $ 15,658 |  | $ 12,661
Recognition of remaining compensation expense over a weighted-average period |  |  | 2 years 9 months 18 days |  |

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