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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]      
Lease renewal period 5 years    
Operating lease, rental expense $ 3,600,000us-gaap_OperatingLeasesRentExpenseNet $ 2,500,000us-gaap_OperatingLeasesRentExpenseNet $ 2,200,000us-gaap_OperatingLeasesRentExpenseNet
Accrued litigation 100,000us-gaap_LitigationReserve    
Litigation reserve before recoveries 700,000grub_LitigationReserveBeforeRecoveries    
Estimated Insurance Recoveries 600,000us-gaap_EstimatedInsuranceRecoveries    
Restructuring expense 1,313,000us-gaap_RestructuringCharges 200,000us-gaap_RestructuringCharges  
Contract Termination      
Loss Contingencies [Line Items]      
Restructuring expense 500,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember		    
Merger Income Tax Consequences      
Loss Contingencies [Line Items]      
Indemnification related to business combination $ 15,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= grub_MergerIncomeTaxConsequencesMember