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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 207.8
Tax basis of REIT assets in excess of balance sheet	2,000.0
Tax credit carryforward	8.3
Unrecognized tax benefits, interest and penalties accrued	21.3	$ 14.2	$ 8.4
Capital Loss Carryforward
Income Tax Contingency [Line Items]
Tax credit carryforward	8.0
Indemnification of officers and directors
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	$ 33.8

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Tax Basis of Assets, Greater (Lower) Than Reported Balance

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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-Name Accounting Standards Codification
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