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Dividends/Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Dividends [Line Items]
Dividends declared, per share	$ 0.50	$ 0.50	$ 1.00	$ 0.96	$ 0.96	$ 0.96	$ 2.00	$ 2.88
Distributions paid, preferred stockholders	$ 91			$ 91			$ 273	$ 273
Distributions paid, preferred stockholders, per share	$ 15.95			$ 15.95			$ 47.85	$ 47.85
Distributions paid	$ 50,416			$ 96,390			$ 201,499	$ 288,344
Distributions paid, per share	$ 0.50			$ 0.96			$ 2.00	$ 2.88

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Dividends [Line Items]

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

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

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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