Components of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Total acquired intangible assets, Gross Carrying Amount	$ 667,773	$ 667,773
Amortizable intangible assets, Accumulated Amortization	(222,637)	(212,935)
Total acquired intangible assets, Net Carrying Value	445,136	454,838
Amortizable intangible assets, Gross Carrying Amount	578,097	578,097
Amortizable intangible assets, Net Carrying Value	355,460	365,162
Indefinite-lived trademarks	89,676	89,676
Restaurant relationships
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Accumulated Amortization	(165,316)	(158,885)
Amortizable intangible assets, Gross Carrying Amount	492,791	492,791
Amortizable intangible assets, Net Carrying Value	327,475	333,906
Diner acquisition
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Accumulated Amortization	(31,982)	(29,567)
Amortizable intangible assets, Gross Carrying Amount	48,293	48,293
Amortizable intangible assets, Net Carrying Value	16,311	18,726
Developed technology
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Accumulated Amortization	(22,534)	(21,696)
Amortizable intangible assets, Gross Carrying Amount	34,095	34,095
Amortizable intangible assets, Net Carrying Value	11,561	12,399
Other
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Accumulated Amortization	(2,805)	(2,787)
Amortizable intangible assets, Gross Carrying Amount	2,918	2,918
Amortizable intangible assets, Net Carrying Value	$ 113	$ 131