For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Name:	us-gaap_DueFromJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Real Estate Activities - Loans - Additional Information (Detail) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) Property Operator	Dec. 31, 2019 USD ($)	Aug. 31, 2018 EUR (€)
Loans [Line Items]
Repayments of mortgage loans	$ 800,000
Acquisition loans	338,273	$ 123,893
Joint Venture Partner [Member]
Loans [Line Items]
Acquisition loans	$ 205,000
Primotop Holdings S.a.r.l. [Member]
Loans [Line Items]
Shareholder loan to joint venture \| €			€ 290
Mortgage Loans [Member] \| Steward Health Care System LLC [Member]
Loans [Line Items]
Number of real estate properties \| Property	6
Number of operators \| Operator	4
Mortgage Loans [Member] \| Prime Healthcare Services [Member]
Loans [Line Items]
Repayments of mortgage loans	$ 328,000