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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Real Estate Activities - Alecto Healthcare Facilities - Additional Information (Detail) - Alecto Healthcare Services [Member] $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($) Property	Dec. 31, 2019 Property	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Number of leased properties		4
Real estate impairment charge \| $	$ 20.0		$ 30.0
Ohio [Member]
Business Acquisition [Line Items]
Number of leased properties terminated	2
Total Gross Assets [Member] \| Customer Concentration Risk [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Percentage of Total Gross Assets		0.60%