Acquisitions - Valuation Methods for Intangible Assets Acquired (Detail)	12 Months Ended
	Dec. 31, 2019
Restaurant relationships | Tapingo
Business Acquisition [Line Items]
Valuation Method	Multi-period excess earnings
Restaurant relationships | LevelUp
Business Acquisition [Line Items]
Valuation Method	With or without comparative business valuation
Restaurant relationships | Eat24
Business Acquisition [Line Items]
Valuation Method	Multi-period excess earnings
Restaurant relationships | Foodler
Business Acquisition [Line Items]
Valuation Method	Multi-period excess earnings
Diner acquisition | Tapingo
Business Acquisition [Line Items]
Valuation Method	n/a
Diner acquisition | LevelUp
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Diner acquisition | Eat24
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Diner acquisition | Foodler
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Developed technology | Tapingo
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Developed technology | LevelUp
Business Acquisition [Line Items]
Valuation Method	Multi-period excess earnings
Developed technology | Eat24
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Developed technology | Foodler
Business Acquisition [Line Items]
Valuation Method	Cost to recreate
Trademarks | Tapingo
Business Acquisition [Line Items]
Valuation Method	n/a
Trademarks | LevelUp
Business Acquisition [Line Items]
Valuation Method	n/a
Trademarks | Eat24
Business Acquisition [Line Items]
Valuation Method	Relief from royalty
Trademarks | Foodler
Business Acquisition [Line Items]
Valuation Method	Relief from royalty