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Notes payable - Narrative (Details)					1 Months Ended				3 Months Ended		9 Months Ended	12 Months Ended	14 Months Ended
Notes payable - Narrative (Details)	Sep. 30, 2020 USD ($) property	Aug. 28, 2020 USD ($)	Aug. 11, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) property	Jul. 31, 2020	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021	Sep. 30, 2020 USD ($) property	Sep. 30, 2020 USD ($) property	Dec. 31, 2019 USD ($)	Jun. 30, 2021 USD ($)	Nov. 01, 2020 property
Debt Instruments [Line Items]
Note Payable	$ 934,673,000			$ 974,863,000	$ 934,673,000					$ 934,673,000	$ 934,673,000	$ 974,863,000
Loss on extinguishment of debt										$ 210,000	210,000
Debt Instrument, Debt Default
Proceeds from credit facility											300,000,000
Payments on credit facility											$ 300,000,000
Number of hotels whose operations have been temporarily suspended due to COVID-19 \| property	15				15					15	15			3
Number of hotels owned by the Company \| property	19				19					19	19			19
Unsecured revolving credit facility
Debt Instrument, Debt Default
Proceeds from credit facility								$ 300,000,000.0
Payments on credit facility		$ 11,200,000	$ 38,800,000				$ 250,000,000.0
Outstanding balance on credit facility	$ 0				$ 0					$ 0	$ 0
Debt Covenant Preferred Stock Authorization													$ 200,000,000.0
Debt Covenant Cash Available For Acquisitions													250,000,000.0
Debt covenant cash available for capital improvements													$ 110,000,000.0
Remaining borrowing capacity available	$ 500,000,000.0				$ 500,000,000.0					$ 500,000,000.0	$ 500,000,000.0
Credit facility expiration date	Apr. 14, 2023
Number of credit facility extension periods	2				2					2	2
Term of extension period for unsecured debt	6 months
Credit facility expiration date after extensions	Apr. 14, 2024
$85.0 million term loan
Debt Instruments [Line Items]
Note Payable	$ 85,000,000			$ 85,000,000	$ 85,000,000					$ 85,000,000	$ 85,000,000	$ 85,000,000
Term loan total interest rate, including effect of swap agreement	3.791%			2.941%	3.791%					3.791%	3.791%	2.941%
Debt Instrument, Debt Default
Debt maturity date											Sep. 03, 2022	Sep. 03, 2022
$100.0 million term loan
Debt Instruments [Line Items]
Note Payable	$ 100,000,000			$ 100,000,000	$ 100,000,000					$ 100,000,000	$ 100,000,000	$ 100,000,000
Term loan total interest rate, including effect of swap agreement	4.053%			3.203%	4.053%					4.053%	4.053%	3.203%
Debt Instrument, Debt Default
Debt maturity date											Jan. 31, 2023	Jan. 31, 2023
Senior Notes
Debt Instruments [Line Items]
Increase (decrease) in interest rate (as a percent)						1.00%			(0.25%)
Leverage ratio									5.0
Payments on unsecured debt					$ 35,000,000.0
Loss on extinguishment of debt					200,000
Series A Senior Notes
Debt Instruments [Line Items]
Note Payable	$ 90,000,000			$ 120,000,000	$ 90,000,000					$ 90,000,000	$ 90,000,000	$ 120,000,000
Fixed interest rate (as a percent)	5.69%			4.69%	5.69%					5.69%	5.69%	4.69%
Payments on unsecured debt					$ 30,000,000.0
Debt Instrument, Debt Default
Debt maturity date											Jan. 10, 2026	Jan. 10, 2026
Series B Senior Notes
Debt Instruments [Line Items]
Note Payable	$ 115,000,000			$ 120,000,000	$ 115,000,000					$ 115,000,000	$ 115,000,000	$ 120,000,000
Fixed interest rate (as a percent)	5.79%			4.79%	5.79%					5.79%	5.79%	4.79%
Payments on unsecured debt					$ 5,000,000.0
Debt Instrument, Debt Default
Debt maturity date											Jan. 10, 2028	Jan. 10, 2028
Hilton Times Square mortgage
Debt Instrument, Debt Default
Debt default description											The Company has not made its debt payments for the $77.2 million loan secured by the Hilton Times Square since April 2020; although the Company continues to accrue interest expense on the debt, including $1.7 million in default interest and penalties accrued as of September 30, 2020. While the Company is required to record such default interest and penalties, recovery by the lender of these expenses is non-recourse to the Company, and the Company does not intend to pay the default interest and penalties as part of the ultimate resolution with the lender. The loan matures on November 1, 2020, and is included in current portion of notes payable on the Company’s consolidated balance sheets as of September 30, 2020 and December 31, 2019. In addition, the hotel’s ground leases require monthly payments be paid to the respective landlords, which the Company has not made since March 2020 (see Notes 8 and 9). As such, the Company has received default notices from its lender and landlords, and is working with the lender to explore various options in advance of the November 2020 debt maturity, which could include a negotiated transfer of the hotel to the lender or its landlords or a discounted payoff of the loan.
Amount of debt in default	$ 77,200,000				$ 77,200,000					$ 77,200,000	$ 77,200,000
Default interest expense										$ 900,000	$ 1,700,000
Debt maturity date											Nov. 01, 2020
London Interbank Offered Rate (LIBOR) \| Unsecured Term Loans \| Minimum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)				1.35%							1.35%
London Interbank Offered Rate (LIBOR) \| Unsecured Term Loans \| Maximum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)				2.20%		2.20%					2.20%
London Interbank Offered Rate (LIBOR) \| $85.0 million term loan \| Minimum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)											1.35%	1.35%
London Interbank Offered Rate (LIBOR) \| $85.0 million term loan \| Maximum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)											2.20%	2.20%
Interest rate, description of reference rate											one-month LIBOR	one-month LIBOR
London Interbank Offered Rate (LIBOR) \| $100.0 million term loan \| Minimum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)											1.35%	1.35%
London Interbank Offered Rate (LIBOR) \| $100.0 million term loan \| Maximum
Debt Instrument, Debt Default
Interest rate added to base rate (as a percent)											2.20%	2.20%
Interest rate, description of reference rate											one-month LIBOR	one-month LIBOR
Base Rate \| Unsecured Term Loans \| Minimum
Debt Instruments [Line Items]
Debt instrument variable rate floor						0.25%
Base Rate \| Unsecured Term Loans \| Unsecured revolving credit facility \| Minimum
Debt Instruments [Line Items]
Debt instrument variable rate floor						0.25%
Base Rate \| $85.0 million term loan \| Minimum
Debt Instruments [Line Items]
Debt instrument variable rate floor											0.25%
Base Rate \| $100.0 million term loan \| Minimum
Debt Instruments [Line Items]
Debt instrument variable rate floor											0.25%