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Subsequent Events - Additional Information (Detail) - $ / shares				3 Months Ended
	Oct. 28, 2019	Oct. 15, 2019	Oct. 11, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Dividend distributed				$ 0.13	$ 0.13	$ 0.125	$ 0.125	$ 0.12	$ 0.115
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend paid			$ 0.13
Dividend record date	Dec. 13, 2019		Sep. 13, 2019
Dividend distributed	$ 0.13
Dividend payment date	Jan. 10, 2020
Subsequent Event [Member] | 7.875% Series C Cumulative Redeemable Perpetual Preferred Stock [Member]
Subsequent Event [Line Items]
Dividend record date	Dec. 31, 2019	Oct. 01, 2019
Dividend paid		$ 0.4921875
Dividend payment date	Jan. 15, 2020
Preferred stock dividends declared	$ 0.4921875
Subsequent Event [Member] | 8.25% Series D Cumulative Redeemable Perpetual Preferred Stock [Member]
Subsequent Event [Line Items]
Dividend record date	Dec. 31, 2019	Oct. 01, 2019
Dividend paid		$ 0.515625
Dividend payment date	Jan. 15, 2020
Preferred stock dividends declared	$ 0.515625
Subsequent Event [Member] | 8% Series B Cumulative Redeemable Perpetual Preferred Stock [Member]
Subsequent Event [Line Items]
Dividend record date	Dec. 31, 2019	Oct. 01, 2019
Dividend paid		$ 0.50
Dividend payment date	Jan. 15, 2020
Preferred stock dividends declared	$ 0.50

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Aggregate dividends paid during the period for each share of common stock outstanding.

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