Revenue Disclosures - Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Franchise revenues
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 166,954	$ 67,876	$ 307,930	$ 212,913
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenue	78,124	31,011	142,401	98,611
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	72,324	29,095	133,209	90,818
Pancake and waffle dry mix sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenue	13,525	4,037	24,415	16,885
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 2,981	$ 3,733	$ 7,905	$ 6,599