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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