Schedule of Acquisition-Date Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Thousands			9 Months Ended
	May 05, 2016	Dec. 04, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill			$ 437,009		$ 396,220
Fair value of common stock issued				$ (15,980)
Net cash paid			65,849	$ 55,687
LABite
Business Acquisition [Line Items]
Cash and cash equivalents	$ 2,566
Accounts receivable	2,320
Prepaid expenses and other assets	68
Intangible assets			48,684
Property and equipment	257
Goodwill	40,789
Accounts payable and accrued expenses	(6,303)
Net deferred tax liability	(19,966)
Total purchase price plus cash acquired	68,415
Cash acquired	(2,566)
Net cash paid	65,849
Dining In, Restaurants on Run and Delivered Dish
Business Acquisition [Line Items]
Cash and cash equivalents		$ 698
Accounts receivable		2,331
Prepaid expenses and other assets		325
Property and equipment		161
Goodwill		43,432
Accounts payable and accrued expenses		(5,826)
Total purchase price plus cash acquired		90,585
Cash acquired		(698)
Fair value of common stock issued		(15,980)
Net cash paid		73,907
Customer and vendor relationships | LABite
Business Acquisition [Line Items]
Intangible assets	46,513		46,513
Customer and vendor relationships | Dining In, Restaurants on Run and Delivered Dish
Business Acquisition [Line Items]
Intangible assets		44,259
Developed technology | LABite
Business Acquisition [Line Items]
Intangible assets	1,731		1,731
Developed technology | Dining In, Restaurants on Run and Delivered Dish
Business Acquisition [Line Items]
Intangible assets		4,676
Trademarks | LABite
Business Acquisition [Line Items]
Intangible assets	$ 440		$ 440
Trademarks | Dining In, Restaurants on Run and Delivered Dish
Business Acquisition [Line Items]
Intangible assets		$ 529