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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
0 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Apr. 02, 2014
Dec. 31, 2013
Aug. 08, 2013
Dec. 31, 2014
Segment
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Line Items]            
Reverse stock split description       The share and per share amounts for all periods presented reflect the completion of the Company’s 1-for-2 reverse stock split, which the Company effected on April 2, 2014.    
Reverse stock split ratio 0.5us-gaap_StockholdersEquityNoteStockSplitConversionRatio1          
Advertising costs       $ 45,900,000us-gaap_AdvertisingExpense $ 25,000,000us-gaap_AdvertisingExpense $ 20,400,000us-gaap_AdvertisingExpense
Expected dividend yield       0.00%us-gaap_FairValueAssumptionsExpectedDividendRate    
Taxable income percentage reselected in taxable income   100.00%grub_TaxableIncomePercentage 74.00%grub_TaxableIncomePercentage      
Unrecognized tax expense that would have impact tax rate         900,000grub_AmountOfIncomeTaxExpenseThatWouldHaveIncreasedIfTaxedAsCorporation 2,700,000grub_AmountOfIncomeTaxExpenseThatWouldHaveIncreasedIfTaxedAsCorporation
Goodwill Impairment       0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss  
Number of reportable segment       1us-gaap_NumberOfReportableSegments    
Customer Concentration Risk | Revenue            
Significant Accounting Policies [Line Items]            
Number of customers accounted       0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Concentration risk percentage       1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Customer Concentration Risk | Accounts receivable            
Significant Accounting Policies [Line Items]            
Number of customers accounted       0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
0grub_NumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Concentration risk percentage       10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
Developed software            
Significant Accounting Policies [Line Items]            
Capitalized cost   2,600,000us-gaap_CapitalizedComputerSoftwareGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
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  $ 3,600,000us-gaap_CapitalizedComputerSoftwareGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
$ 2,600,000us-gaap_CapitalizedComputerSoftwareGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
$ 2,300,000us-gaap_CapitalizedComputerSoftwareGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember