Commitments and Contingencies - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) hotel term	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Ground Leases
Number of properties subject to ground lease | hotel		14
Rent expense		$ 22,300,000	$ 11,100,000	$ 5,400,000
Cash required for reserve, as a percentage of hotel revenue, minimum		3.00%
Cash required for reserve, as a percentage of hotel revenue, maximum		5.00%
Restricted cash reserves		$ 64,695,000	72,606,000	67,206,000
Loss Contingency, Damages Sought, Value	$ 8,300,000
Residence Inn Chicago Oak Brook
Ground Leases
Period of additional terms for which lease may be extended		99 years
Marriott Louisville Downtown
Ground Leases
Period of additional terms for which lease may be extended		25 years
Maximum number of additional terms for which lease may be extended | term		4
Courtyard Austin Downtown Convention Center and Residence Inn Austin Downtown Convention Center
Ground Leases
Rent expense		$ 900,000	900,000	900,000
Hilton Garden Inn Bloomington
Ground Leases
Period of additional terms for which lease may be extended		10 years
Maximum number of additional terms for which lease may be extended | term		5
Courtyard Charleston Historic District
Ground Leases
Rent expense		$ 1,000,000	1,000,000	1,000,000
Courtyard Waikiki Beach
Ground Leases
Rent expense		3,500,000	3,500,000	3,400,000
Residence Inn Palo Alto Los Altos
Ground Leases
Rent expense		63,043	60,619	$ 58,287
DoubleTree Suites by Hilton Orlando - Lake Buena Vista [Member]
Ground Leases
Rent expense		828,397	248,041
Embassy Suites San Francisco Airport Waterfront [Member]
Ground Leases
Rent expense		2,326,274	720,910
Doubletree by Hilton Burlington Vermont [Member]
Ground Leases
Rent expense		119,615	50,666
Vinoy Renaissance St. Petersburg Resort & Golf Club [Member]
Ground Leases
Rent expense		1,943,883	1,003,373
Wyndham Boston Beacon Hill [Member]
Ground Leases
Rent expense		882,978	288,806
Wyndham New Orleans French Quarter [Member]
Ground Leases
Rent expense		486,773	114,236
Wyndham Pittsburgh University Center [Member]
Ground Leases
Rent expense		800,054	141,948
Wyndham San Diego Bayside [Member]
Ground Leases
Rent expense		4,790,482	1,512,704
Holiday Inn San Francisco Fisherman's Wharf [Member]
Ground Leases
Rent expense		$ 4,581,926	$ 1,619,499