Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 323,258	$ 210,403	$ 784,328	$ 579,574
Non-Topic 606 revenues	111	368	332	1,105
Total revenues	323,369	210,771	784,660	580,679
Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	309,226	195,499	740,683	525,675
Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	14,032	14,904	43,645	53,899
Royalty fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	127,317	79,666	299,606	200,157
Royalty fees | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	127,317	79,666	299,606	200,157
Royalty fees | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	0	0	0	0
Initial franchise and relicensing fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	6,149	6,071	18,904	20,031
Initial franchise and relicensing fees | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	6,149	6,071	18,904	20,031
Initial franchise and relicensing fees | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	0	0	0	0
Procurement services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	13,010	10,115	36,293	34,609
Procurement services | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	12,285	9,620	34,526	33,069
Procurement services | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	725	495	1,767	1,540
Marketing and reservation system
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	156,871	107,141	384,380	297,203
Marketing and reservation system | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	145,216	93,327	346,211	247,092
Marketing and reservation system | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	11,655	13,814	38,169	50,111
Owned hotels
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	11,266	4,093	24,392	15,407
Owned hotels | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	9,614	3,498	20,683	13,159
Owned hotels | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	1,652	595	3,709	2,248
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	8,645	3,317	20,753	12,167
Other | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	8,645	3,317	20,753	12,167
Other | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0