Components of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	$ 548,693	$ 515,463
Amortizable intangible assets, Accumulated Amortization	(117,502)	(89,586)
Amortizable intangible assets, Net Carrying Value	431,191	425,877
Indefinite-lived trademarks	89,676	89,676
Total acquired intangible assets, Gross Carrying Amount	638,369	605,139
Total acquired intangible assets, Net Carrying Value	520,867	515,553
Restaurant relationships
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	467,797	457,580
Amortizable intangible assets, Accumulated Amortization	(96,321)	(76,852)
Amortizable intangible assets, Net Carrying Value	371,476	380,728
Diner acquisition
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	44,159	40,247
Amortizable intangible assets, Accumulated Amortization	(7,982)	(1,906)
Amortizable intangible assets, Net Carrying Value	36,177	38,341
Developed technology
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	28,630	8,523
Amortizable intangible assets, Accumulated Amortization	(8,591)	(6,418)
Amortizable intangible assets, Net Carrying Value	20,039	2,105
Trademarks
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	2,225	2,225
Amortizable intangible assets, Accumulated Amortization	(2,225)	(402)
Amortizable intangible assets, Net Carrying Value		1,823
Below-market lease intangible
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	2,206
Amortizable intangible assets, Accumulated Amortization	(21)
Amortizable intangible assets, Net Carrying Value	2,185
Other
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	3,676	6,888
Amortizable intangible assets, Accumulated Amortization	(2,362)	(4,008)
Amortizable intangible assets, Net Carrying Value	$ 1,314	$ 2,880