Number of leased properties.

No definition available.

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- Definition

Number of re-leased properties.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The number of real estate properties owned as of the balance sheet date.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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Real Estate and Other Activities - Alecto Facilities - Additional Information (Detail) - Alecto Healthcare Services [Member] $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2021 Property	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Property	Dec. 31, 2020 Property
Business Acquisition [Line Items]
Number of leased properties	4
Number of properties owned			1
Real estate impairment charge \| $		$ 9.1
Number of re-leased properties				1
Proceeds from sale of mortgage loans \| $			$ 51.0
Total Gross Assets [Member] \| Customer Concentration Risk [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of total assets			0.10%