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Schedule of Acquisition-Date Fair Value of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Aug. 08, 2013 GrubHub Holdings Inc	Aug. 08, 2013 GrubHub Holdings Inc Customer Relationships	Aug. 08, 2013 GrubHub Holdings Inc Developed technology	Aug. 08, 2013 GrubHub Holdings Inc Trademarks
Business Acquisition [Line Items]
Cash and cash equivalents			$ 13,266
Accounts receivable			2,108
Other identifiable assets			4,422
Intangible assets				167,450	5,143
Deferred tax asset			4,013
Deferred tax liability			(88,937)
Goodwill	352,788	352,788	239,346
Liabilities assumed			(10,602)
Trademarks						85,276
Total net assets acquired			$ 421,485