Components of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	$ 515,463	$ 294,610
Amortizable intangible assets, Accumulated Amortization	(89,586)	(70,656)
Amortizable intangible assets, Net Carrying Value	425,877	223,954
Indefinite-lived trademarks	89,676	89,676
Total acquired intangible assets, Gross Carrying Amount	605,139	384,286
Total acquired intangible assets, Net Carrying Value	515,553	313,630
Restaurant relationships
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	457,580	279,651
Amortizable intangible assets, Accumulated Amortization	(76,852)	(57,765)
Amortizable intangible assets, Net Carrying Value	380,728	221,886
Developed technology
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	8,523	10,640
Amortizable intangible assets, Accumulated Amortization	(6,418)	(9,575)
Amortizable intangible assets, Net Carrying Value	2,105	1,065
Diner acquisition
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	40,247
Amortizable intangible assets, Accumulated Amortization	(1,906)
Amortizable intangible assets, Net Carrying Value	38,341
Trademarks
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	2,225	969
Amortizable intangible assets, Accumulated Amortization	(402)	(582)
Amortizable intangible assets, Net Carrying Value	1,823	387
Other
Schedule Of Finite And Indefinite Lived Intangible Assets [Line Items]
Amortizable intangible assets, Gross Carrying Amount	6,888	3,350
Amortizable intangible assets, Accumulated Amortization	(4,008)	(2,734)
Amortizable intangible assets, Net Carrying Value	$ 2,880	$ 616