Revenue Disclosures - Disaggregation of Franchise Revenue by Major Type (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Franchise revenues
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 161,126	$ 121,752	$ 469,056	$ 334,665
Royalties
Disaggregation of Revenue [Line Items]
Total franchise revenue	75,098	56,061	217,499	154,672
Advertising fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	70,709	51,932	203,918	142,750
Pancake and waffle dry mix sales and other
Disaggregation of Revenue [Line Items]
Total franchise revenue	12,782	10,690	37,197	27,575
Franchise and development fees
Disaggregation of Revenue [Line Items]
Total franchise revenue	$ 2,537	$ 3,069	$ 10,442	$ 9,668