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Related Party Transactions - Additional Information (Detail) (Aramark, USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aramark
       
Related Party Transaction [Line Items]        
Notes receivable       $ 16,000,000us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember
Notes receivable interest rate       3.40%us-gaap_RelatedPartyTransactionRate
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember
Proceeds from repayment of notes receivable 16,000,000us-gaap_ProceedsFromCollectionOfNotesReceivable
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember
     
Due to related parties   0us-gaap_DueToRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember
   
Corporate service agreement expense   $ 100,000us-gaap_ProfessionalAndContractServicesExpense
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember
$ 400,000us-gaap_ProfessionalAndContractServicesExpense
/ us-gaap_RelatedPartyTransactionAxis
= grub_AramarkMember