Related Party Transactions - Narrative (Details)						3 Months Ended			12 Months Ended	18 Months Ended
	Jul. 01, 2020 USD ($) installment	Mar. 20, 2020 USD ($)	Sep. 25, 2019 USD ($)	Aug. 07, 2018 USD ($)	Jun. 26, 2018 USD ($)	Mar. 31, 2021 USD ($) hotel	Mar. 31, 2020 hotel	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) hotel	Jan. 14, 2021	Jan. 04, 2021 USD ($)	Aug. 25, 2020 USD ($)	Mar. 13, 2020 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Aggregate non-listed preferred equity offerings			$ 400,000,000			$ 400,000,000
Number of hotels | hotel						103	117
Ashford Inc.
Related Party Transaction [Line Items]
Allocation percentage			75.00%			0.00%
Ashford Inc. | Ashford Inc.
Related Party Transaction [Line Items]
Allocation percentage						50.00%
Ashford Inc. | Braemar Hotels & Resorts Inc
Related Party Transaction [Line Items]
Allocation percentage			25.00%			50.00%
Subsidiaries
Related Party Transaction [Line Items]
Number of hotel properties managed by affiliates | hotel						68				68
Number of hotels | hotel						102
Management Fee
Related Party Transaction [Line Items]
Portion of project management fees to project costs (as a percent)				4.00%		4.00%
Remington Hotels
Related Party Transaction [Line Items]
Security deposit						$ 1,200,000			$ 1,200,000	$ 1,200,000
Ashford Inc.
Related Party Transaction [Line Items]
Quarterly base fee (as a percent)											0.70%
Advisory services, incentive fee term (in years)						3 years
Related party transaction, percentage of advisory fees paid											80.00%
Contribution amount committed			$ 15,000,000
Contribution amount funded										3,000,000.0
Ashford Inc. | Other Assets
Related Party Transaction [Line Items]
Contribution amount funded						$ 66,000			$ 85,000
Ashford Inc. | Base Management Fees
Related Party Transaction [Line Items]
Reimbursable expenses												$ 2,800,000
Ashford Inc. | Affiliated entity
Related Party Transaction [Line Items]
ERFP, percent of commitment for each hotel					10.00%
ERFP, term after acquisition (in years)					3 years
ERFP, initial term (in years)					2 years
ERFP, renewal term (in years)					1 year
ERFP, notice term (in days)					60 days
Ashford Inc. | Affiliated entity | Embassy Suites New York Manhattan Times Square
Related Party Transaction [Line Items]
Entitled to receive for furniture, fixtures, and equipment															$ 19,500,000
Consideration for FF&E								$ 8,100,000
Remaining ERFP amount														$ 11,400,000
Lismore Capital
Related Party Transaction [Line Items]
Advisory fees waived													$ 540,000
Lismore Capital | Mortgages
Related Party Transaction [Line Items]
Advisory fees waived													$ 94,000
Lismore Capital | Subsidiaries
Related Party Transaction [Line Items]
Advisory services, term (in months)	24 months
Advisory services, aggregate fee	$ 2,600,000
Number of installments | installment	3
Monthly installment fee	$ 857,000
Advisory services aggregate fee, percent	0.25%
Advisory services, extension term (in months)	12 months
Advisory services, amount paid	$ 8,300,000	$ 5,100,000
Advisory services, financing amount	$ 4,100,000,000
Advisory services, multiple percentage	0.125%
Periodic installment payments						5,100,000
Payment expensed in accordance with the agreement						5,000,000.0
Claw back credit						506,000
Payment amount to be offset against future fees						156,000
Expensed recognized in other assets						2,700,000
Expensed recognized in write-off loan costs and exit fees						3,700,000
Lismore Capital | Subsidiaries | Payable Reduction
Related Party Transaction [Line Items]
Advisory services, rate	0.10%
Lismore Capital | Subsidiaries | Advisory services fee
Related Party Transaction [Line Items]
Advisory services, rate	0.75%
Lismore Capital | Subsidiaries | Percent of Conversion Value
Related Party Transaction [Line Items]
Advisory services, rate	1.50%
Lismore Capital | Subsidiaries | Percent of Face Value
Related Party Transaction [Line Items]
Advisory services, rate	50.00%
Lismore Capital | Subsidiaries | Success Fees
Related Party Transaction [Line Items]
Payable fees						$ 8,700,000				$ 8,700,000
Minimum | Management Fee | Management Fee
Related Party Transaction [Line Items]
Percent of gross revenue						3.00%
Minimum | Ashford Inc.
Related Party Transaction [Line Items]
Quarterly base fee (as a percent)						0.50%				0.50%
Total market capitalization						$ 6,000,000,000.0				$ 6,000,000,000.0
Minimum | Remington Hotels | Management Fee | Management Fee
Related Party Transaction [Line Items]
Payment of monthly property management fees				$ 14,000		$ 14,000
Percent of gross revenue				3.00%
Maximum | Ashford Inc.
Related Party Transaction [Line Items]
Quarterly base fee (as a percent)						0.70%				0.70%
Total market capitalization						$ 10,000,000,000.0				$ 10,000,000,000.0
Maximum | Ashford Inc. | Affiliated entity
Related Party Transaction [Line Items]
ERFP investment amount (up to)					$ 50,000,000
ERFP commitment amount subject to increase					$ 100,000,000