Concentration (Details)	12 Months Ended
	Dec. 31, 2021 hotel state travelCenter property retailProperty
Concentration Risk
Number of properties	1,091
Net Lease Property
Concentration Risk
Number of properties	788
TravelCenters of America Inc. | Net Lease Property
Concentration Risk
Number of properties | travelCenter	179
Net Lease Property
Concentration Risk
Number of properties | retailProperty	1,091
Hotel
Concentration Risk
Number of properties | hotel	303
Hotel | Sonesta Agreement
Concentration Risk
Number of properties | hotel	261
North America
Concentration Risk
Number of states in which properties are located | state	47
Ontario, Canada | Hotel
Concentration Risk
Number of properties	2
Credit concentration | Net Lease Property | Real Estate Assets at Cost | TravelCenters of America LLC
Concentration Risk
Concentration risk percentage	27.50%
Geographic Concentration Risk | Geographic distribution, foreign | Hotel | Real Estate
Concentration Risk
Concentration risk percentage	1.60%
Geographic Concentration Risk | Various States, USA | Geographic distribution, domestic | Minimum | Real Estate
Concentration Risk
Concentration risk percentage	6.00%
Geographic Concentration Risk | Various States, USA | Geographic distribution, domestic | Maximum | Real Estate
Concentration Risk
Concentration risk percentage	11.00%