Organization and Description of Business (Details)	12 Months Ended
	Dec. 31, 2020 property
Organization and Description of Business
Number of hotels owned by the Company	17
Number of hotels whose operations have been temporarily suspended due to COVID-19	14
Number of hotels reopened after being temporarily suspended due to COVID-19	12
Sunstone Hotel Partnership, LLC
Organization and Description of Business
Controlling interest owned (as a percent)	100.00%
Hotel owned by the Company
Organization and Description of Business
Number of hotels owned by the Company	17
Number of hotels managed by third parties	17
Hotel owned by the Company | Marriott
Organization and Description of Business
Number of hotels managed by third parties	6
Hotel owned by the Company | Crestline Hotels & Resorts
Organization and Description of Business
Number of hotels managed by third parties	2
Hotel owned by the Company | Highgate Hotels L.P. and an affiliate
Organization and Description of Business
Number of hotels managed by third parties	2
Hotel owned by the Company | Hilton Worldwide
Organization and Description of Business
Number of hotels managed by third parties	2
Hotel owned by the Company | Interstate Hotels & Resorts, Inc
Organization and Description of Business
Number of hotels managed by third parties	2
Hotel owned by the Company | Davidson Hotels & Resorts
Organization and Description of Business
Number of hotels managed by third parties	1
Hotel owned by the Company | Hyatt Corporation
Organization and Description of Business
Number of hotels managed by third parties	1
Hotel owned by the Company | Singh Hospitality, LLC
Organization and Description of Business
Number of hotels managed by third parties	1
Oceans Edge Resort & Marina
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 22, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jun. 04, 2020
Embassy Suites Chicago
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Apr. 01, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jul. 01, 2020
Marriott Boston Long Wharf
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 12, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jul. 07, 2020
Hilton New Orleans St. Charles
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 28, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jul. 13, 2020
Hyatt Centric Chicago Magnificent Mile
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Apr. 06, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jul. 13, 2020
JW Marriott New Orleans
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 28, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Jul. 14, 2020
Hilton San Diego Bayfront
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 23, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Aug. 11, 2020
Renaissance Washington DC
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 26, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Aug. 24, 2020
Hyatt Regency San Francisco
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 22, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Oct. 01, 2020
Renaissance Orlando at SeaWorld
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 20, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Oct. 01, 2020
The Bidwell Marriott Portland
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 27, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Oct. 05, 2020
Wailea Beach Resort
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 25, 2020
Date operations reopened after being temporarily suspended due to COVID-19	Nov. 01, 2020
Hilton Garden Inn Chicago Downtown/Magnificent Mile
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Mar. 27, 2020
Renaissance Westchester
Organization and Description of Business
Date operations temporarily suspended due to COVID-19	Apr. 04, 2020