Number of additional leased properties.

No definition available.

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- Definition

Number of leased properties.

+ References

No definition available.

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- Definition

Number of re-leased properties.

+ References

No definition available.

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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.

+ References

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- Definition

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

+ References

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- Definition

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 Activities - Alecto Facilities - Additional Information (Detail) - Alecto Healthcare Services [Member] $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2020 Property	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Number of leased properties			4
Real estate impairment charge \| $		$ 9.1		$ 20.0	$ 30.0
Number of re-leased properties	1
Number of additional leased properties			1
Proceeds from sale of mortgage loans \| $			$ 43.0
Total Gross Assets [Member] \| Customer Concentration Risk [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of total assets			0.50%