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Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Non-vested stock options	Aug. 08, 2013 GrubHub Holdings Inc	Aug. 08, 2013 GrubHub Holdings Inc Non-vested stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of shares issued				$ 421,485,000		$ 421,485,000	$ 11,000,000
Unrecognized compensation expense	20,000,000		20,000,000				12,500,000
Number of stock options granted			1,838,073	3,669,958
Aggregate intrinsic value of awards exercised	35,700,000	800,000	47,300,000	900,000
Stock-based compensation	2,300,000	1,800,000	6,981,000	3,024,000
Unrecognized compensation expense recognition period					2 years 11 months 19 days
Excess tax benefit related to stock-based compensation, decrease in operating Activities			4,569,000	0
Excess tax benefit related to stock-based compensation			$ 4,569,000	$ 0