Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 218,040	$ 209,043
Non-Topic 606 revenues	280	351
Total revenues	218,320	209,394
Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	211,594	202,125
Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	6,446	6,918
Royalty fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	80,353	76,698
Royalty fees | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	80,353	76,698
Royalty fees | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	0	0
Initial franchise and relicensing fees
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	6,807	6,214
Initial franchise and relicensing fees | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	6,807	6,214
Initial franchise and relicensing fees | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	0	0
Procurement services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	11,947	9,938
Procurement services | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	11,487	9,565
Procurement services | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	460	373
Marketing and reservation system
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	110,064	107,001
Marketing and reservation system | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	104,078	101,128
Marketing and reservation system | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	5,986	5,873
Other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	8,869	9,192
Other | Over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	8,869	8,520
Other | Point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 0	$ 672