Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 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 the replacement awards					$ 11,000,000
Total purchase price				421,500,000
Unrecognized compensation expense	29,800,000			12,500,000
Number of stock options granted	1,598,990	368,750
Aggregate intrinsic value of awards exercised	6,500,000
Stock based compensation	$ 2,403,000	$ 621,000
Unrecognized compensation expense recognition period			3 years 4 months 13 days