Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 08, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options expire period from the date of grant	10 years
Fair value of shares issued		$ 421,485,000
Compensation expense recognized in the post-Merger consolidated financial statements	19,200,000
Options, Granted	2,019,413	3,698,708	1,619,167
Aggregate intrinsic value of awards exercised	74,000,000	3,400,000	100,000
Stock-based compensation	9,393,000	4,933,000	2,364,000
Excess tax benefit related to stock-based compensation	12,975,000
Website and software development cost
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock base compensation capitalized as website and software development cost	100,000
Non-vested stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense recognition period	2 years 11 months 12 days
Excess tax benefit related to stock-based compensation, decrease in operating activities	12,975,000	0	0
Excess tax benefit related to stock-based compensation	12,975,000	0	0
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense recognition period	4 years
Non-vested restricted stock units	2,899	0	0
Unrecognized compensation expense related to Restricted Stock Units	100,000
Weighted average grant date fair value	$ 31.90
Excess tax benefits	0	0	0
Grub​Hub​ Holdings ​Inc
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of shares issued				421,485,000
Grub​Hub​ Holdings ​Inc | Non-vested stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of shares issued				11,000,000
Compensation expense recognized in the post-Merger consolidated financial statements				$ 12,500,000
Omnibus Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term for stock options issued to employees	4 years
Omnibus Incentive Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Term for stock options issued to employees	10 years
Common stock shares authorized for incentive	10,351,283