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Real Estate Facilities - Summary of Relative Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 01, 2022	Nov. 10, 2020
SSGT II Merger Agreement
Business Acquisition [Line Items]
Intangible assets acquired	$ 8.0
KeyBank SST IV CMBS Loan
Business Acquisition [Line Items]
Debt		$ 40.5
Fair market value discount on debt	$ 16.1	0.1
SST IV TCF Loan
Business Acquisition [Line Items]
Debt		$ 40.8

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- Definition

Business combination fair market value discount on debt.

+ References

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No definition available.

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- Definition

Amount of long-term debt due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=128092470&loc=d3e4845-128472

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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