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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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