GrubHub 10-Q 6 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'GRUB	'
Entity Registrant Name	'GRUBHUB INC.	'
Entity Central Index Key	'0001594109	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	81,525,072

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$212,020	$86,542
Short term investments	65,736	'
Accounts receivable, less allowances for doubtful accounts	42,690	29,304
Deferred taxes, current	3,844	3,688
Prepaid expenses	3,116	2,625
Total current assets	327,406	122,159
PROPERTY AND EQUIPMENT:	'	'
Property and equipment, net of depreciation and amortization	16,449	17,096
OTHER ASSETS:	'	'
Other assets	3,610	2,328
Goodwill	352,788	352,788
Acquired intangible assets, net of amortization	257,864	268,441
Total other assets	614,262	623,557
TOTAL ASSETS	958,117	762,812
CURRENT LIABILITIES:	'	'
Restaurant food liability	91,719	78,245
Accounts payable	2,005	3,353
Accrued payroll	4,283	1,720
Taxes payable	249	1,768
Restructuring accrual	674	176
Other accruals	8,799	7,329
Total current liabilities	107,729	92,591
LONG TERM LIABILITIES:	'	'
Deferred taxes, non-current	98,862	90,495
Other accruals	5,636	3,936
Total long term liabilities	104,498	94,431
Commitments and Contingencies	'	'
Redeemable common stock, $0.0001 par value, no shares and 1,344,236 shares outstanding as of September 30, 2014 and December 31, 2013, respectively	'	18,415
STOCKHOLDERS’ EQUITY:	'	'
Series A Convertible Preferred Stock, $0.0001 par value. Authorized: 25,000,000 shares as of September 30, 2014 and December 31, 2013; issued and outstanding: no shares as of September 30, 2014 and 19,284,113 shares as of December 31, 2013; aggregate liquidation preference of $86,200 as of December 31, 2013	'	2
Common stock, $0.0001 par value. Authorized: 500,000,000 and 165,000,000 shares at September 30, 2014 and December 31, 2013, respectively; issued and outstanding: 81,042,800 and 53,757,437 shares as of September 30, 2014 and December 31, 2013, respectively	8	5
Accumulated other comprehensive income	18	132
Additional paid-in capital	675,806	500,356
Retained earnings	70,058	56,880
Total Stockholders’ Equity	745,890	557,375
TOTAL LIABILITIES, REDEEMABLE COMMON STOCK AND STOCKHOLDERS’ EQUITY	$958,117	$762,812

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Redeemable common stock, par value	$0.00	$0.00
Redeemable common stock, shares outstanding	0	1,344,236
Series A Convertible Preferred Stock, par value	$0.00	$0.00
Series A Convertible Preferred Stock, shares authorized	25,000,000	25,000,000
Series A Convertible Preferred Stock, shares issued	0	19,284,113
Series A Convertible Preferred Stock, shares outstanding	0	19,284,113
Series A Convertible Preferred Stock, liquidation preference	'	$86,200
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	500,000,000	165,000,000
Common stock, shares issued	81,042,800	53,757,437
Common stock, shares outstanding	81,042,800	53,757,437

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]	'	'	'	'
Revenues	$61,941	$35,461	$180,560	$88,119
Costs and expenses:	'	'	'	'
Sales and marketing	14,883	8,829	47,168	24,993
Operations and support	14,902	9,303	44,743	21,278
Technology (exclusive of amortization)	6,560	4,459	17,973	9,803
General and administrative	8,143	5,884	25,087	14,596
Depreciation and amortization	5,748	3,821	16,878	7,494
Total costs and expenses	50,236	32,296	151,849	78,164
Income before provision for income taxes	11,705	3,165	28,711	9,955
Provision for income taxes	5,252	1,111	15,213	4,822
Net income	6,453	2,054	13,498	5,133
Preferred stock tax distributions	'	-425	-320	-1,073
Net income attributable to common stockholders	$6,453	$1,629	$13,178	$4,060
Net income per share attributable to common stockholders:	'	'	'	'
Basic	$0.08	$0.04	$0.19	$0.11
Diluted	$0.08	$0.03	$0.17	$0.10
Weighted average shares used to compute net income per share attributable to common stockholders:	'	'	'	'
Basic	79,426	45,072	70,893	35,936
Diluted	82,771	63,114	80,826	49,942

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net income	$6,453	$2,054	$13,498	$5,133
OTHER COMPREHENSIVE INCOME (LOSS)	'	'	'	'
Foreign currency translation adjustments	-298	272	-114	47
COMPREHENSIVE INCOME	$6,155	$2,326	$13,384	$5,180

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income	$13,498	$5,133
Adjustments to reconcile net income to net cash from operating activities:	'	'
Depreciation	3,708	2,123
Provision for doubtful accounts	232	178
Loss on disposal of fixed assets	11	'
Deferred taxes	8,211	-1,971
Intangible asset amortization	13,170	5,371
Tenant allowance amortization	-119	-119
Stock-based compensation	6,981	3,024
Deferred rent	16	-87
Change in assets and liabilities, net of the effects of business acquisitions:	'	'
Accounts receivable	-13,618	-8,035
Prepaid expenses and other assets	-1,773	-1,827
Accounts payable	-1,348	1,262
Restaurant food liability	13,474	19,184
Accrued payroll	2,563	1,148
Other accruals	2,252	-2,784
Net cash provided by operating activities	47,258	22,600
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Cash acquired in merger of GrubHub Holdings Inc.	'	13,266
Capitalized website and development costs	-2,396	-1,939
Purchases of property and equipment	-3,189	-3,828
Purchases of investments	-65,736	'
Net cash provided by (used in) investing activities	-71,321	7,499
CASH FLOWS FROM FINANCING ACTIVITIES	'	'
Net proceeds from the issuance of common stock	142,936	'
Proceeds from exercise of stock options	4,656	565
Excess tax benefit related to stock-based compensation	4,569	0
Taxes paid related to net settlements of stock-based compensation awards	-2,070	'
Repurchases of common stock	-116	-1,362
Preferred stock tax distributions	-320	-1,893
Net cash provided by (used in) financing activities	149,655	-2,690
Net change in cash and cash equivalents	125,592	27,409
Effect of exchange rates on cash	-114	47
Cash and cash equivalents at beginning of year	86,542	41,161
Cash and cash equivalents at end of the period	212,020	68,617
SUPPLEMENTAL DISCLOSURE OF NON CASH ITEMS	'	'
Fair value of common and preferred stock issued in acquisition of GrubHub Holdings Inc.	'	421,485
Cash paid for income taxes	1,324	2,584
Cashless exercise of stock options	1,053	'
Settlement of receivable through cashless acquisition of treasury shares in connection with the cashless exercise of stock options	-3,239	'
Cashless Exercise	'	'
SUPPLEMENTAL DISCLOSURE OF NON CASH ITEMS	'	'
Settlement of receivable through cashless acquisition of treasury shares in connection with the cashless exercise of stock options	($3,123)	'

Organization_and_Reorganizatio

Organization and Reorganization	9 Months Ended
	Sep. 30, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Organization and Reorganization	'
	1. Organization and Reorganization
	Organization
	GrubHub Inc., a Delaware corporation, and its wholly-owned subsidiaries (collectively referred to as the “Company”) provide an online and mobile platform for restaurant pick-up and delivery orders. Diners enter their location through an online interface and the Company displays the menus and other relevant information for restaurants in its network. Orders may be placed directly online or over the phone at no cost to the diner. The Company charges the restaurant a per order commission that is largely fee based.
	Initial Public Offering
	On April 4, 2014, the Company completed an initial public offering (the “IPO”) in which it issued and sold 4,000,000 shares of class A common stock at a public offering price of $26.00 per share. The Company received net proceeds of $94.9 million after deducting underwriting discounts and commissions of $6.5 million and other offering expenses of approximately $2.6 million. These expenses were recorded against the proceeds received from the IPO.
	Certain selling stockholders offered an additional 3,405,614 shares of common stock in the IPO and also granted the underwriters an option to purchase up to 1,110,842 additional shares of common stock. The Company did not receive any proceeds from the sale of the shares sold by the selling stockholders.
	Upon the closing of the IPO, all shares of the Company’s then-outstanding convertible Series A Preferred Stock automatically converted into an aggregate of 19,284,113 shares of common stock. Additionally, the put rights for the Company’s redeemable common stock were terminated upon the closing of the IPO.
	Follow-on Offering
	On September 3, 2014, the Company completed a follow-on offering in which it issued and sold 1,250,000 shares of common stock at a public offering price of $40.25 per share. The Company received net proceeds of $48.0 million after deducting underwriting discounts and commissions of $1.9 million and other offering expenses of approximately $0.4 million. These expenses were recorded against the proceeds received from the follow-on offering.
	Certain selling stockholders offered an additional 9,218,198 shares of common stock. These selling stockholders also granted the underwriters an option to purchase up to 1,570,229 additional shares of common stock, which was not exercised. The Company did not receive any proceeds from the sale of the shares sold by the selling stockholders.
	The Company invested the funds received from the IPO and the follow-on offering in non-interest bearing accounts, short-term interest-bearing obligations and investment-grade investments.
	Reorganization and History
	On August 8, 2013, GrubHub Inc. acquired, through a series of transactions, all of the equity interests of each of Seamless North America, LLC, Seamless Holdings Corporation (“Seamless Holdings”) and GrubHub Holdings Inc. pursuant to that certain Reorganization and Contribution Agreement, dated as of May 19, 2013, by and among GrubHub Inc., Seamless North America, LLC, Seamless Holdings, GrubHub Holdings Inc. and the other parties thereto (the “Reorganization Agreement”). Following this transaction, the Company concluded that Seamless Holdings was deemed the acquirer for financial reporting purposes. See Note 3, Acquisitions, for additional details. Accordingly, the acquisition of GrubHub Holdings Inc. has been accounted for as a business combination. The results of operations of GrubHub Holdings Inc. have been included in the Company’s financial statements since August 9, 2013. In February 2014, GrubHub Seamless Inc. was renamed GrubHub Inc.
	The financial position and results of operations of Seamless Holdings and Seamless North America, LLC have been included in the condensed consolidated financial statements for all periods presented.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2. Significant Accounting Policies
	Basis of Presentation
	The accompanying unaudited condensed consolidated interim financial statements include the accounts of GrubHub Inc. and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These unaudited condensed consolidated interim financial statements include all wholly owned subsidiaries and reflect all normal and recurring adjustments, as well as any other than normal adjustments, that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods and should be read in conjunction with the Company’s prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on September 5, 2014 (the “Prospectus”). All significant intercompany transactions have been eliminated in consolidation. Operating results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2014.
	Marketable Securities
	Marketable securities consist primarily of commercial paper and investment grade U.S. and non-U.S.-issued corporate debt securities with maturities within one year of the balance sheet date. Marketable securities with original maturities of three months or less are included in cash and cash equivalents and marketable securities with original maturities greater than three months, but less than one year, are included in short term investments on the balance sheet. The Company determines the classification of its marketable securities as available-for-sale or held-to-maturity at the time of purchase and reassesses these determinations at each balance sheet date. Debt securities are classified as held-to-maturity when the Company has the positive intent to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost and are periodically assessed for other-than-temporary impairment. The amortized cost of debt securities is adjusted for the amortization of premiums and accretion of discounts to maturity, which is recognized as interest income within general and administrative expenses in the condensed consolidated statements of operations. Interest income is recognized when earned.
	Use of Estimates
	The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. Estimates include revenue recognition, the allowance for doubtful accounts, website development costs, goodwill, depreciable lives of property and equipment, recoverability of intangible assets with definite lives and other long-lived assets and stock-based compensation. Actual results could differ from these estimates.
	Reverse Stock Split Ratio
	On April 2, 2014, the Company effected a 1-for-2 reverse stock split of its issued and outstanding common stock and preferred stock. Any fractional shares resulting from the reverse stock split were rounded up to the nearest whole share. All share and per-share amounts for all periods presented in these financial statements have been adjusted retroactively to reflect the reverse stock split.
	There have been no material changes to the Company’s significant accounting policies described in the Prospectus.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”), which supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific requirements. ASU 2014-09 establishes a five-step revenue recognition process in which an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 will be effective for the Company in the first quarter of 2017. Management is currently evaluating the impact the adoption of ASU 2014-09 will have on the Company’s condensed consolidated financial position, results of operations or cash flows and the method of retrospective application, either full or modified.
	In July 2013, the FASB issued Accounting Standards Update No. 2013-11 “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”), which requires that a liability related to an unrecognized tax benefit be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward that the entity intends to use and is available for settlement at the reporting date. ASU 2013-11 was effective for and adopted by the Company in the first quarter of 2014 and applied prospectively to unrecognized tax benefits that existed at the effective date. The adoption of ASU 2013-11 impacted the Company’s financial statement presentation and disclosures, but otherwise did not impact the Company’s condensed consolidated financial position, results of operations or cash flows.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	3. Acquisitions
	GrubHub Holdings Inc.
	On August 8, 2013, the Company acquired all of the equity interests of each of Seamless North America, LLC, Seamless Holdings and GrubHub Holdings Inc. pursuant to the Reorganization Agreement. In February 2014, GrubHub, Inc. changed its name to GrubHub Holdings Inc. The Company issued 23,318,580 shares of common stock and 8,098,430 shares of preferred stock to GrubHub Holdings Inc. in exchange for all of GrubHub Holdings Inc.’s equity interests (the “Merger”). The Company concluded that Seamless Holdings was deemed the acquirer for financial reporting purposes based on key deciding factors such as a majority ownership and majority of the board of director seats. Accordingly, the acquisition of GrubHub Holdings Inc. has been accounted for as a business combination. The results of operations of GrubHub Holdings Inc. have been included in the Company’s financial statements since August 9, 2013. GrubHub Holdings Inc. provides online food ordering through its website grubhub.com, and also operates allmenus.com, a website that stores and displays approximately 275,000 menus. The Merger has expanded the Company’s existing markets and access to new customers and created revenue and cost synergies which management believes will contribute to future profits.
	The fair value of the equity issued to GrubHub Holdings Inc. in connection with the Merger was approximately $421.5 million. The value of the equity was determined using the estimated fair value of the stock of GrubHub Holdings Inc. at the merger date based on a valuation of GrubHub Holdings Inc. performed by management. The assets acquired and liabilities assumed were recorded at their estimated fair values as of August 8, 2013. The fair value of the equity of $421.5 million included approximately $11.0 million related to the fair value of the replacement awards that were attributed to the pre-combination service period for GrubHub Holdings Inc. option holders. The fair value of the replacement awards was determined using the Black-Scholes option pricing model. Post combination expense of $12.5 million is expected to be recognized post-Merger for the unrecognized compensation expense related to GrubHub Holdings Inc. stock options. See Note 8, Stock-Based Compensation, for further details.
	The excess of the consideration transferred in the acquisition over the net amounts assigned to the fair value of the assets acquired was recorded as goodwill, which represents the opportunity to expand existing markets and access new customers and to create revenue and cost synergies that management believes will contribute to future profits. The goodwill is not deductible for income tax purposes.
	The Company incurred certain expenses directly and indirectly related to the Merger of $1.3 million and $4.7 million during the three and nine months ended September 30, 2013, respectively, which were recognized in general and administrative expenses within the condensed consolidated statements of operations.
	The following table summarizes the August 8, 2013 acquisition-date fair value of the assets and liabilities acquired in connection with the GrubHub Holdings Inc. business combination:
				(in thousands)
	Cash and cash equivalents			$	13,266
	Accounts receivable				2,108
	Other identifiable assets				4,422
	Customer and vendor relationships				167,450
	Deferred tax asset				4,013
	Deferred tax liability				(88,937	)
	Developed technology				5,143
	Goodwill				239,346
	Liabilities assumed				(10,602	)
	Trademarks				85,276
	Total net assets acquired			$	421,485
	The estimated fair values of the intangible assets acquired were determined based on a combination of the income, cost, and market approaches to measure the fair value of the customer (restaurant) relationships, developed technology and trademarks. The fair value of the trademarks was measured based on the relief from royalty method. The cost approach, specifically the cost to recreate method, was used to value the developed technology. The income approach, specifically the multi-period excess earnings method, was used to value the customer (restaurant) relationships. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 measurements within the fair value hierarchy.
	The following unaudited pro forma information presents a summary of the operating results of the Company for the three and nine months ended September 30, 2013 as if GrubHub Inc. had acquired GrubHub Holdings Inc. as of January 1, 2013:
		Three Months Ended				Nine Months Ended
		30-Sep-13				30-Sep-13
		(in thousands)
	Revenues	$	41,035			$	121,062
	Net income		1,473				2,246
	The pro forma adjustments reflect the additional amortization that would have been recognized for the intangible assets, replacement stock option awards compensation cost for services performed after the Merger, elimination of transaction costs incurred and pro forma tax adjustments for the three and nine months ended September 30, 2013 as follows:
		Three Months Ended					Nine Months Ended
		30-Sep-13					30-Sep-13
		(in thousands)
	Amortization of intangible assets	$	1,141				$	6,475
	Stock-based compensation		573					2,997
	Transaction costs		(1,701	)				(9,131	)
	Income tax expense (benefit)		17					(2,750	)
	The unaudited pro forma revenues are not intended to represent or be indicative of the Company’s condensed consolidated results of operations or financial condition that would have been reported had the Merger been completed as of the beginning of the periods presented and should not be taken as indicative of the Company’s future consolidated results of operations or financial condition.

Marketable_Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Marketable Securities	'
	4. Marketable Securities
	The amortized cost, unrealized gains and losses and estimated fair value of the Company’s held-to-maturity marketable securities as of September 30, 2014 were as follows:
		30-Sep-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
		(in thousands)
	Cash and cash equivalents
	Commercial paper	$	8,999	$	—		$	(1	)	$	8,998
	Corporate bonds		600		—			—			600
	Short term investments
	Commercial paper		24,228		—			(8	)		24,220
	Corporate bonds		41,508		2			(24	)		41,486
	Total	$	75,335	$	2		$	(33	)	$	75,304
	All of the Company’s marketable securities were classified as held-to-maturity investments and have maturities within one year of September 30, 2014.
	The gross unrealized losses, estimated fair value and length of time the individual marketable securities were in a continuous loss position for those marketable securities in an unrealized loss position as of September 30, 2014 were as follows:
		30-Sep-14
		Less Than 12 Months					12 Months or Greater					Total
		Estimated Fair Value		Unrealized Loss			Estimated Fair Value			Unrealized Loss		Estimated Fair Value		Unrealized Loss
		(in thousands)
	Commercial paper	$	33,218	$	(9	)	$	—		$	—	$	33,218	$	(9	)
	Corporate bonds		32,756		(24	)		—			—		32,756		(24	)
	Total	$	65,974	$	(33	)	$	—		$	—	$	65,974	$	(33	)
	During the three months ended September 30, 2014, the Company did not recognize any other-than-temporary impairment losses related to its marketable securities. The Company did not have any marketable securities other than money market funds prior to July 1, 2014.
	The Company’s marketable securities are classified within Level 2 of the fair value hierarchy (see Note 11, Fair Value Measurement, for further details).

Goodwill_and_Acquired_Intangib

Goodwill and Acquired Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Acquired Intangible Assets	'
	5. Goodwill and Acquired Intangible Assets
	The components of acquired intangible assets as of September 30, 2014 and December 31, 2013 were as follows:
		30-Sep-14
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(1,963	)	$	3,180
	Customer and vendor relationships, databases		191,979		(26,971	)		165,008
	Total amortizable intangible assets		197,122		(28,934	)		168,188
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(28,934	)	$	257,864
		31-Dec-13
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(677	)	$	4,466
	Customer and vendor relationships, databases		191,979		(17,680	)		174,299
	Total amortizable intangible assets		197,122		(18,357	)		178,765
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(18,357	)	$	268,441
	Amortization expense for acquired intangible assets was $3.6 million and $2.3 million for the three months ended September 30, 2014 and 2013, respectively, and $10.6 million and $3.4 million for the nine months ended September 30, 2014 and 2013, respectively.
	There were no changes in the carrying amount of goodwill for the nine months ended September 30, 2014.
	Estimated future amortization expense of acquired intangible assets as of September 30, 2014 was as follows:
		(in thousands)
	The remainder of 2014	$	3,525
	2015		14,102
	2016		13,344
	2017		12,068
	2018		12,068
	Thereafter		113,081
	Total	$	168,188

Property_and_Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2014
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	6. Property and Equipment
	The components of the Company’s property and equipment as of September 30, 2014 and December 31, 2013 were as follows:
		30-Sep-14			31-Dec-13
		(in thousands)
	Computer equipment	$	12,204		$	9,739
	Furniture and fixtures		2,530			2,176
	Developed software		16,406			13,930
	Purchased software		2,129			2,124
	Leasehold improvement		6,474			6,120
	Property and equipment		39,743			34,089
	Accumulated amortization and depreciation		(23,294	)		(16,993	)
	Property and equipment, net	$	16,449		$	17,096
	The Company recorded depreciation and amortization expense for property and equipment other than developed software for the three months ended September 30, 2014 and 2013 of $1.5 million and $0.5 million, respectively, and $4.2 million and $2.1 million for the nine months ended September 30, 2014 and 2013, respectively.
	The Company capitalized developed software costs of $1.3 million and $0.5 million for the three months ended September 30, 2014 and 2013, respectively, and $2.4 million and $1.9 million for the nine months ended September 30, 2014 and 2013, respectively. Amortization expense for developed software costs, recognized in depreciation and amortization in the condensed consolidated statements of operations, for the three months ended September 30, 2014 and 2013 was $0.7 million and $1.0 million, respectively, and $2.1 million and $2.0 million for the nine months ended September 30, 2014 and 2013, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	7. Commitments and Contingencies
	Legal
	In August 2011, Ameranth filed a patent infringement action against a number of defendants, including GrubHub Holdings Inc., in the U.S. District Court for the Southern District of California (the “Court”), Case No. 3:11-cv-1810 (“’1810 action”). In September 2011, Ameranth amended its complaint in the ’1810 action to also accuse Seamless North America, LLC of infringement. Ameranth alleged that the GrubHub Holdings Inc. and Seamless North America, LLC ordering systems, products and services infringe claims 12 through 15 of U.S. Patent No. 6,384,850 (“’850 patent”) and claims 11 and 15 of U.S. Patent No. 6,871,325 (“’325 patent”).
	In March 2012, Ameranth initiated eight additional actions for infringement of a third, related patent, U.S. Patent No. 8,146,077 (“’077 patent”), in the same forum, including separate actions against GrubHub Holdings Inc., Case No. 3:12-cv-739 (“’739 action”), and Seamless North America, LLC, Case No. 3:12-cv-737 (“’737 action”). In August 2012, the Court severed the claims against GrubHub Holdings Inc. and Seamless North America, LLC in the ’1810 action and consolidated them with the ’739 action and the ’737 action, respectively. Later, the Court consolidated these separate cases against GrubHub Holdings Inc. and Seamless North America, LLC, along with the approximately 40 other cases Ameranth filed in the same district, with the original ’1810 action. In their answers, GrubHub Holdings Inc. and Seamless North America, LLC denied infringement and interposed various defenses, including non-infringement, invalidity, unenforceability and inequitable conduct.
	On November 26, 2013, the consolidated case was stayed pending the disposition of petitions for post-grant review of all the patents in the suit. These petitions were filed in the United States Patent and Trademark Office (the “PTO”) under the new Transitional Program for Covered Business Method Patents (the “CBM proceedings”). The CBM proceedings resulted in a March 26, 2014 ruling denying defendants’ petitions on the claims most relevant to GrubHub Holdings Inc. and Seamless North America LLC. The consolidated case remains stayed.
	No trial date has been set for this case. The Company believes this case lacks merit and that it has strong defenses to all of the infringement claims. The Company intends to defend the suit vigorously. However, the Company is unable to predict the likelihood of success of Ameranth’s infringement claims and is unable to predict the likelihood of success of its counterclaims. The Company has not recorded an accrual related to this lawsuit as of September 30, 2014, as it does not believe a material loss is probable. It is a reasonable possibility that a loss may be incurred; however, the possible range of loss is not estimable given the early stage of the dispute and the uncertainty as to whether the claims at issue are with or without merit, will be settled out of court, or will be determined in the Company’s favor, whether the Company may be required to expend significant management time and financial resources on the defense of such claims, and whether the Company will be able to recover any losses under its insurance policies.
	In addition to the matters described above, from time to time, the Company is involved in various other legal proceedings arising from the normal course of business activities. As of September 30, 2014, the Company had reserved $0.2 million for such litigation, which included an aggregate reserve of $0.6 million less an expected insurance recovery of $0.4 million.
	Indemnification
	In connection with the Merger, the Company agreed to indemnify Aramark Holdings for negative income tax consequences associated with the October 2012 spin-off of Seamless Holdings that were the result of certain actions taken by the Company, including its solicitation of acquirers to purchase the Company prior to October 29, 2014, and in certain other instances, subject to a $15.0 million limitation. Management is not aware of any actions that would impact the indemnification obligation.
	Restructuring
	On November 20, 2013, the Company announced plans to close its Sandy, Utah office location in 2014. The Company recorded a restructuring accrual in the condensed consolidated balance sheets for severance and payroll related benefits and other facility closure costs as a result of the restructuring announcement. This amount represents the service vesting requirements for identified employees required to work for various periods beyond the communication date, including through the expected closure date of the facility of November 30, 2014, and related lease termination costs. The Company estimates total restructuring costs to be incurred will be approximately $1.2 million, including expense of $0.5 million recognized during the three months ended September 30, 2014 related to the termination of the Sandy, Utah office lease agreement. For the three and nine months ended September 30, 2014, restructuring expense of $0.7 million and $1.2 million, respectively, was recognized in general and administrative expenses in the condensed consolidated statements of operations.
	The following table summarizes the Company’s restructuring activity during the nine months ended September 30, 2014:
		(in thousands)
	Restructuring accrual balance at December 31, 2013	$	176
	Restructuring expense		1,162
	Cash payments		(664	)
	Restructuring accrual balance at September 30, 2014	$	674

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	8. Stock-Based Compensation
	As part of the Reorganization Agreement, the Company was required to replace GrubHub Holdings Inc.’s share-based payment awards. The fair value of the replacement awards attributable to pre-combination services at the time of the Merger was approximately $11.0 million, which was included as additional consideration transferred in the business combination in the total purchase price of $421.5 million. The fair value of the replacement options attributable to post combination services was approximately $12.5 million and will be recognized as compensation cost in the Company’s post-Merger consolidated financial statements over the remaining vesting period.
	The Company granted 1,838,073 and 3,669,958 stock options during the nine months ended September 30, 2014 and 2013, respectively. The fair value of each stock option award was estimated based on the assumptions below as of the grant date using the Black-Scholes-Merton option pricing model. Expected volatilities are based on historical volatilities of comparable publicly traded companies. The Company uses historical data to estimate option exercises and employee terminations within the valuation model. Separate groups of employees that have similar historical exercise behavior are considered separately for valuation purposes. The expected term of the award is estimated using a simplified method. The fair value at grant date was determined considering the performance of the Company at the grant date as well as future growth and profitability expectations by applying market and income approaches. The risk-free rate for the period within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The assumptions used to determine the fair value of the stock options granted during the nine months ended September 30, 2014 and 2013 were as follows:
		Nine Months Ended September 30,
		2014			2013
	Weighted average fair value options granted	$	13.54		$	7.96
	Average risk-free interest rate		1.99	%		1.4	%
	Expected stock price volatilities(a)		50.4	%		50.7	%
	Dividend yield	None			None
	Expected stock option life (years)		6.28			5.2
	a)	There was no active external or internal market for the Company’s shares until April of 2014. Thus, it was not possible to estimate the expected volatility of the Company’s share price in estimating fair value of options granted. As a substitute for such volatility, the Company used the historical volatility of comparable companies.
	Stock option awards as of December 31, 2013 and September 30, 2014, and changes during the nine months ended September 30, 2014, were as follows:
		Options			Weighted			Average Intrinsic		Weighted Average
					Average			Value		Exercise Term
					Exercise Price			(thousands)		(years)
	Outstanding at December 31, 2013		7,669,553		$	4.08		$	56,844		8.29
	Granted		1,838,073			16.66
	Forfeited		(713,754	)		5.94
	Exercised		(1,674,905	)	3.48
	Outstanding at September 30, 2014		7,118,967			7.29			192,800		8
	Vested and expected to vest at September 30, 2014		5,588,472			6.32			156,604	7.84
	Exercisable at September 30, 2014		2,932,418		$	4.02		$	88,612		7.45
	The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the fair value of the common stock on September 30, 2014 and December 31, 2013, respectively, and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their in-the-money options on each date. This amount will change in future periods based on the fair value of the Company’s stock and the number of options outstanding. The aggregate intrinsic value of awards exercised during the three and nine months ended September 30, 2014 was $35.7 million and $47.3 million, respectively. The aggregate intrinsic value of awards exercised during the three and nine months ended September 30, 2013 was $0.8 million and $0.9 million, respectively.
	The stock options vest over different lengths of time depending upon the grantee. Compensation expense is recognized over the vesting period. The Company recorded compensation expense of $2.3 million and $1.8 million for the three months ended September 30, 2014 and 2013, respectively, and $7.0 million and $3.0 million for the nine months ended September 30, 2014 and 2013, respectively. As of September 30, 2014, total unrecognized compensation cost, adjusted for estimated forfeitures, related to non-vested stock options was $20.0 million and is expected to be recognized over a weighted average period of 2.97 years.
	Excess Tax Benefits
	During the nine months ended September 30, 2014, the Company reported excess tax benefits as a decrease in cash flows from operations and an increase in cash flows from financing activities of $4.6 million. There were no excess tax benefits during the nine months ended September 30, 2013. Excess tax benefits reflect the total of the individual stock option exercise transactions in which the reduction to the Company’s income tax liability is greater than the deferred tax assets that were previously recorded. The Company has elected to use the with-and-without method in determining the order in which tax attributes are utilized. As a result, the Company will only recognize a tax benefit for stock-based awards in additional paid-in capital if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	9. Stockholders’ Equity
	As of September 30, 2014 and December 31, 2013, the Company was authorized to issue two classes of stock: common stock and Series A Preferred Stock. Each share of Series A Preferred Stock was convertible, at the option of the holder thereof, into common stock on a one-for-one basis, subject to adjustment as defined in the Company’s amended and restated certificate of incorporation. The Company entered into a stockholders agreement in 2013 with certain stockholders. The agreement prevented those stockholders from transferring their shares without the consent of a majority of the stockholders.
	On April 4, 2014, the Company completed the IPO in which the Company issued and sold 4,000,000 shares of common stock at a public offering price of $26.00 per share. The Company received net proceeds of $94.9 million after deducting underwriting discounts and commissions of $6.5 million and other offering expenses of approximately $2.6 million. Upon the closing of the IPO, the stockholder’s agreement ceased to be in effect.
	On September 3, 2014, the Company completed a follow-on offering in which it issued and sold 1,250,000 shares of common stock at a public offering price of $40.25 per share. The Company received net proceeds of $48.0 million after deducting underwriting discounts and commissions of $1.9 million and other offering expenses of approximately $0.4 million. These expenses were recorded against the proceeds received from the follow-on offering.
	Common Stock
	Each holder of common stock will have one vote per share of common stock held on all matters that are submitted for stockholder vote. Upon liquidation, the common stock was junior to the rights and preferences of the Series A Preferred Stock as of December 31, 2013. At September 30, 2014 and December 31, 2013, there were 500,000,000 and 165,000,000 shares of common stock authorized, respectively. At September 30, 2014 and December 31, 2013, there were 81,042,800 and 53,757,437 shares issued and outstanding, respectively. The Company did not hold any shares as treasury shares as of September 30, 2014 or December 31, 2013.
	Series A Preferred Stock
	The Company was authorized to issue 25,000,000 shares of preferred stock as of September 30, 2014 and December 31, 2013. Upon the closing of the IPO on April 4, 2014, all shares of the Company’s then-outstanding convertible Series A Preferred Stock automatically converted on a one-for-one basis into an aggregate of 19,284,113 shares of common stock. There were no issued or outstanding shares of preferred stock as of September 30, 2014.
	As of December 31, 2013, the 19,284,113 outstanding shares of Series A Preferred Stock had a liquidation preference of an amount per share equal to the original Series A Preferred Stock issue price of approximately $86.2 million.
	Redeemable Common Stock
	The put rights that would have required the Company to repurchase the Company’s then outstanding redeemable common stock at fair value (as defined in the stockholders agreement) determined at the redemption date were terminated and the shares converted on a one-for-one basis into an aggregate of 1,344,236 shares common stock upon the closing of the IPO on April 4, 2014.
	As of December 31, 2013, there were 1,344,236 shares of common stock with put rights. As the redemption price was equivalent to the fair value of the instrument, the Company adjusted the carrying value of the redeemable common stock to its fair value with an adjustment to equity. The fair value of the redeemable common stock was $18.4 million at December 31, 2013. The Company had an annual redemption limit of $4.0 million.
	The Company’s equity as of December 31, 2013 and September 30, 2014, and changes during the nine months ended September 30, 2014, were as follows:
		(in thousands)
	Balance at December 31, 2013	$	557,375
	Net income		13,498
	Currency translation		(114	)
	Termination of put rights of redeeemable common stock, in connection with the IPO		34,950
	Issuance of common stock, net of issuance costs		142,936
	Change in fair value of redeemable common stock		(16,535	)
	Stock-based compensation		7,061
	Tax benefit related to stock-based compensation		4,569
	Stock option exercises, net of withholdings and other		5,709
	Preferred stock tax distributions		(320	)
	Common stock repurchases		(3,239	)
	Balance at September 30, 2014	$	745,890

Earnings_Per_Share_Attributabl

Earnings Per Share Attributable to Common Stockholders	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share Attributable to Common Stockholders	'
	10. Earnings Per Share Attributable to Common Stockholders
	Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted average number of common shares outstanding during the period without consideration for common stock equivalents. Diluted net income per share attributable to common stockholders is computed by dividing net income by the weighted average number of common shares outstanding during the period and potentially dilutive common stock equivalents, except in cases where the effect of the common stock equivalent would be antidilutive. Potential common stock equivalents consist of common stock issuable upon exercise of stock options using the treasury stock method and common stock issuable upon conversion of the Series A Preferred Stock. Upon the closing of the IPO, all shares of the Company’s then-outstanding convertible Series A Preferred Stock automatically converted into an aggregate of 19,284,113 shares of common stock.
	The following table presents the calculation of basic and diluted net income per share attributable to common stockholders for the three months ended September 30, 2014 and 2013:
		Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
		Income			Shares		Per  Share		Income			Shares		Per  Share
		(Numerator)			(Denominator)		Amount		(Numerator)			(Denominator)		Amount
		(in thousands, except per share data)
	Net income	$	6,453						$	2,054
	Preferred stock tax distributions		—							(425	)
	Basic EPS
	Net income attributable to common stockholders		6,453			79,426	$	0.08		1,629			45,072	$	0.04
	Effect of Dilutive Securities
	Preferred stock		—			—				425			15,902
	Stock options		—			3,345				—			2,140
	Diluted EPS
	Net income attributable to common stockholders	$	6,453			82,771	$	0.08	$	2,054			63,114	$	0.03
	The following table presents the calculation of basic and diluted net income per share attributable to common stock holders for the nine months ended September 30, 2014 and 2013:
		Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
		Income			Shares		Per  Share		Income			Shares		Per  Share
		(Numerator)			(Denominator)		Amount		(Numerator)			(Denominator)		Amount
		(in thousands, except per share data)
	Net income	$	13,498						$	5,133
	Preferred stock tax distributions		(320	)						(1,073	)
	Basic EPS
	Net income attributable to common stockholders		13,178			70,893	$	0.19		4,060			35,936	$	0.11
	Effect of Dilutive Securities
	Preferred stock		320			6,640				1,073			12,758
	Stock options		—			3,293				—			1,248
	Diluted EPS
	Net income attributable to common stockholders	$	13,498			80,826	$	0.17	$	5,133			49,942	$	0.1
	For the three and nine months ended September 30, 2014, 233,983 shares of common stock underlying stock options were excluded from the calculation of diluted net income per share attributable to common stockholders in each period because their effect would have been antidilutive. For the three and nine months ended September 30, 2013, 476,328 shares of common stock underlying stock options were excluded in each period because their effect would have been antidilutive.

Fair_Value_Measurement

Fair Value Measurement	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	11. Fair Value Measurement
	Certain assets and liabilities are required to be recorded at fair value on a recurring basis. Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The standards also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.
	The accounting guidance for fair value measurements prioritizes valuation methodologies based on the reliability of the inputs in the following three-tier value hierarchy:
	Level 1	Quoted prices in active markets for identical assets or liabilities.
	Level 2	Assets and liabilities valued based on observable market data for similar instruments, such as quoted prices for similar assets or liabilities.
	Level 3	Unobservable inputs that are supported by little or no market activity; instruments valued based on the best available data, some of which is internally developed, and considers risk premiums that a market participant would require.
	The Company applied the following methods and assumptions in estimating its fair value measurements: certain money market funds and certificates of deposit with original maturities of less than three months are considered highly liquid investments. The fair value measurement of these assets is based on quoted market prices in active markets and, therefore, these assets are recorded at fair value on a recurring basis and classified as Level 1 within the fair value hierarchy. The Company’s commercial paper and investments in corporate bonds and certain money market funds are classified as Level 2 within the fair value hierarchy because they are valued using inputs other than quoted prices in active markets that are observable directly or indirectly. Redeemable common stock consisted of put rights the Company granted to certain shareholders which required common shares to be repurchased at fair value (as defined in the stockholders agreement) determined as of the redemption date. The fair value measurement of redeemable common stock is based on Level 3 inputs as defined in the fair value hierarchy. Accounts receivable and accounts payable approximate fair value due to their generally short-term maturities.
	The following table presents the balances of assets measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013:
		30-Sep-14											31-Dec-13
		Level 1				Level 2			Level 3				Level 1		Level 2		Level 3
		(in thousands)
	Money market funds	$	4,205			$	19,496		$	—			$	4,200	$	—	$	—
	Commercial paper		—				33,218			—				—		—		—
	Corporate bonds		—				42,086			—				—		—		—
	Redeemable common stock		—				—			—				—		—		18,415
	Total	$	4,205			$	94,800		$	—			$	4,200	$	—	$	18,415
	The fair value of the Company’s redeemable common stock, determined to be Level 3 within the fair value hierarchy, was measured based on the required redemption at the most recent fair value of the common stock. The put rights for the Company’s then outstanding redeemable common stock were terminated and the shares converted on a one-for-one basis into common stock upon the closing of the IPO on April 4, 2014. The following table presents the fair value, valuation techniques and related unobservable inputs for the Level 3 measurement as of December 31, 2013:
				Fair value measurement							Range
				(Level 3)
				(in thousands)
				31-Dec-13				Valuation technique	Unobservable input		31-Dec-13
	Redeemable common stock			$	18,415			Probability Weighted	Discount rate			15.3	%
								Expected Return Method	Lack of marketability per common share			14.9	%
	In addition to assets and liabilities that are recorded at fair value on a recurring basis, the Company is required to record certain assets and liabilities at fair value on a nonrecurring basis, generally as a result of acquisitions. See Note 3, Acquisitions, for further discussion of the fair value of assets and liabilities associated with acquisitions.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated interim financial statements include the accounts of GrubHub Inc. and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. These unaudited condensed consolidated interim financial statements include all wholly owned subsidiaries and reflect all normal and recurring adjustments, as well as any other than normal adjustments, that are, in the opinion of management, necessary for a fair presentation of the results for the interim periods and should be read in conjunction with the Company’s prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on September 5, 2014 (the “Prospectus”). All significant intercompany transactions have been eliminated in consolidation. Operating results for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2014.
Marketable Securities	'
	Marketable Securities
	Marketable securities consist primarily of commercial paper and investment grade U.S. and non-U.S.-issued corporate debt securities with maturities within one year of the balance sheet date. Marketable securities with original maturities of three months or less are included in cash and cash equivalents and marketable securities with original maturities greater than three months, but less than one year, are included in short term investments on the balance sheet. The Company determines the classification of its marketable securities as available-for-sale or held-to-maturity at the time of purchase and reassesses these determinations at each balance sheet date. Debt securities are classified as held-to-maturity when the Company has the positive intent to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost and are periodically assessed for other-than-temporary impairment. The amortized cost of debt securities is adjusted for the amortization of premiums and accretion of discounts to maturity, which is recognized as interest income within general and administrative expenses in the condensed consolidated statements of operations. Interest income is recognized when earned.
Use of Estimates	'
	Use of Estimates
	The preparation of condensed consolidated financial statements in accordance with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the financial statements, as well as the reported amounts of revenue and expenses during the periods presented. Estimates include revenue recognition, the allowance for doubtful accounts, website development costs, goodwill, depreciable lives of property and equipment, recoverability of intangible assets with definite lives and other long-lived assets and stock-based compensation. Actual results could differ from these estimates.
Reverse Stock Split Ratio	'
	Reverse Stock Split Ratio
	On April 2, 2014, the Company effected a 1-for-2 reverse stock split of its issued and outstanding common stock and preferred stock. Any fractional shares resulting from the reverse stock split were rounded up to the nearest whole share. All share and per-share amounts for all periods presented in these financial statements have been adjusted retroactively to reflect the reverse stock split.
	There have been no material changes to the Company’s significant accounting policies described in the Prospectus.
Recently Issued Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”), which supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific requirements. ASU 2014-09 establishes a five-step revenue recognition process in which an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. ASU 2014-09 will be effective for the Company in the first quarter of 2017. Management is currently evaluating the impact the adoption of ASU 2014-09 will have on the Company’s condensed consolidated financial position, results of operations or cash flows and the method of retrospective application, either full or modified.
	In July 2013, the FASB issued Accounting Standards Update No. 2013-11 “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists” (“ASU 2013-11”), which requires that a liability related to an unrecognized tax benefit be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward that the entity intends to use and is available for settlement at the reporting date. ASU 2013-11 was effective for and adopted by the Company in the first quarter of 2014 and applied prospectively to unrecognized tax benefits that existed at the effective date. The adoption of ASU 2013-11 impacted the Company’s financial statement presentation and disclosures, but otherwise did not impact the Company’s condensed consolidated financial position, results of operations or cash flows.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Schedule of Acquisition Date Fair Value of Assets and Liabilities	'
	The following table summarizes the August 8, 2013 acquisition-date fair value of the assets and liabilities acquired in connection with the GrubHub Holdings Inc. business combination:
				(in thousands)
	Cash and cash equivalents			$	13,266
	Accounts receivable				2,108
	Other identifiable assets				4,422
	Customer and vendor relationships				167,450
	Deferred tax asset				4,013
	Deferred tax liability				(88,937	)
	Developed technology				5,143
	Goodwill				239,346
	Liabilities assumed				(10,602	)
	Trademarks				85,276
	Total net assets acquired			$	421,485
Pro Forma Summary of Operation	'
	The following unaudited pro forma information presents a summary of the operating results of the Company for the three and nine months ended September 30, 2013 as if GrubHub Inc. had acquired GrubHub Holdings Inc. as of January 1, 2013:
		Three Months Ended				Nine Months Ended
		30-Sep-13				30-Sep-13
		(in thousands)
	Revenues	$	41,035			$	121,062
	Net income		1,473				2,246
Pro Forma Adjustments	'
	The pro forma adjustments reflect the additional amortization that would have been recognized for the intangible assets, replacement stock option awards compensation cost for services performed after the Merger, elimination of transaction costs incurred and pro forma tax adjustments for the three and nine months ended September 30, 2013 as follows:
		Three Months Ended					Nine Months Ended
		30-Sep-13					30-Sep-13
		(in thousands)
	Amortization of intangible assets	$	1,141				$	6,475
	Stock-based compensation		573					2,997
	Transaction costs		(1,701	)				(9,131	)
	Income tax expense (benefit)		17					(2,750	)

Marketable_Securities_Tables

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Summary of Held-to-Maturity Marketable Securities	'
	The amortized cost, unrealized gains and losses and estimated fair value of the Company’s held-to-maturity marketable securities as of September 30, 2014 were as follows:
		30-Sep-14
		Amortized Cost		Unrealized Gains			Unrealized Losses			Estimated Fair Value
		(in thousands)
	Cash and cash equivalents
	Commercial paper	$	8,999	$	—		$	(1	)	$	8,998
	Corporate bonds		600		—			—			600
	Short term investments
	Commercial paper		24,228		—			(8	)		24,220
	Corporate bonds		41,508		2			(24	)		41,486
	Total	$	75,335	$	2		$	(33	)	$	75,304
Summary of Continuous Unrealized Loss on Marketable Securities	'
	The gross unrealized losses, estimated fair value and length of time the individual marketable securities were in a continuous loss position for those marketable securities in an unrealized loss position as of September 30, 2014 were as follows:
		30-Sep-14
		Less Than 12 Months					12 Months or Greater					Total
		Estimated Fair Value		Unrealized Loss			Estimated Fair Value			Unrealized Loss		Estimated Fair Value		Unrealized Loss
		(in thousands)
	Commercial paper	$	33,218	$	(9	)	$	—		$	—	$	33,218	$	(9	)
	Corporate bonds		32,756		(24	)		—			—		32,756		(24	)
	Total	$	65,974	$	(33	)	$	—		$	—	$	65,974	$	(33	)

Goodwill_and_Acquired_Intangib1

Goodwill and Acquired Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Components of Acquired Intangible Assets (Finite Lived)	'
	The components of acquired intangible assets as of September 30, 2014 and December 31, 2013 were as follows:
		30-Sep-14
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(1,963	)	$	3,180
	Customer and vendor relationships, databases		191,979		(26,971	)		165,008
	Total amortizable intangible assets		197,122		(28,934	)		168,188
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(28,934	)	$	257,864
		31-Dec-13
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(677	)	$	4,466
	Customer and vendor relationships, databases		191,979		(17,680	)		174,299
	Total amortizable intangible assets		197,122		(18,357	)		178,765
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(18,357	)	$	268,441
Components of Acquired Intangible Assets (Infinite Lived)	'
	The components of acquired intangible assets as of September 30, 2014 and December 31, 2013 were as follows:
		30-Sep-14
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(1,963	)	$	3,180
	Customer and vendor relationships, databases		191,979		(26,971	)		165,008
	Total amortizable intangible assets		197,122		(28,934	)		168,188
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(28,934	)	$	257,864
		31-Dec-13
		Gross Carrying		Accumulated			Net Carrying
		Amount		Amortization			Value
		(in thousands)
	Developed technology	$	5,143	$	(677	)	$	4,466
	Customer and vendor relationships, databases		191,979		(17,680	)		174,299
	Total amortizable intangible assets		197,122		(18,357	)		178,765
	Indefinite-lived trademarks		89,676		—			89,676
	Total acquired intangible assets	$	286,798	$	(18,357	)	$	268,441
Estimated Future Amortization of Acquired Intangible Assets	'
	Estimated future amortization expense of acquired intangible assets as of September 30, 2014 was as follows:
		(in thousands)
	The remainder of 2014	$	3,525
	2015		14,102
	2016		13,344
	2017		12,068
	2018		12,068
	Thereafter		113,081
	Total	$	168,188

Property_and_Equipment_Tables

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property Plant And Equipment [Abstract]	'
Components of Property and Equipment	'
	The components of the Company’s property and equipment as of September 30, 2014 and December 31, 2013 were as follows:
		30-Sep-14			31-Dec-13
		(in thousands)
	Computer equipment	$	12,204		$	9,739
	Furniture and fixtures		2,530			2,176
	Developed software		16,406			13,930
	Purchased software		2,129			2,124
	Leasehold improvement		6,474			6,120
	Property and equipment		39,743			34,089
	Accumulated amortization and depreciation		(23,294	)		(16,993	)
	Property and equipment, net	$	16,449		$	17,096

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Restructuring Activity	'
	The following table summarizes the Company’s restructuring activity during the nine months ended September 30, 2014:
		(in thousands)
	Restructuring accrual balance at December 31, 2013	$	176
	Restructuring expense		1,162
	Cash payments		(664	)
	Restructuring accrual balance at September 30, 2014	$	674

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Assumptions Used to Determine Fair Value of Stock Options Granted	'
	The assumptions used to determine the fair value of the stock options granted during the nine months ended September 30, 2014 and 2013 were as follows:
		Nine Months Ended September 30,
		2014			2013
	Weighted average fair value options granted	$	13.54		$	7.96
	Average risk-free interest rate		1.99	%		1.4	%
	Expected stock price volatilities(a)		50.4	%		50.7	%
	Dividend yield	None			None
	Expected stock option life (years)		6.28			5.2
	a)	There was no active external or internal market for the Company’s shares until April of 2014. Thus, it was not possible to estimate the expected volatility of the Company’s share price in estimating fair value of options granted. As a substitute for such volatility, the Company used the historical volatility of comparable companies.
Summary of Stock Option Activity	'
	Stock option awards as of December 31, 2013 and September 30, 2014, and changes during the nine months ended September 30, 2014, were as follows:
		Options			Weighted			Average Intrinsic		Weighted Average
					Average			Value		Exercise Term
					Exercise Price			(thousands)		(years)
	Outstanding at December 31, 2013		7,669,553		$	4.08		$	56,844		8.29
	Granted		1,838,073			16.66
	Forfeited		(713,754	)		5.94
	Exercised		(1,674,905	)	3.48
	Outstanding at September 30, 2014		7,118,967			7.29			192,800		8
	Vested and expected to vest at September 30, 2014		5,588,472			6.32			156,604	7.84
	Exercisable at September 30, 2014		2,932,418		$	4.02		$	88,612		7.45

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Equity and Changes in Equity During Period	'
	The Company’s equity as of December 31, 2013 and September 30, 2014, and changes during the nine months ended September 30, 2014, were as follows:
		(in thousands)
	Balance at December 31, 2013	$	557,375
	Net income		13,498
	Currency translation		(114	)
	Termination of put rights of redeeemable common stock, in connection with the IPO		34,950
	Issuance of common stock, net of issuance costs		142,936
	Change in fair value of redeemable common stock		(16,535	)
	Stock-based compensation		7,061
	Tax benefit related to stock-based compensation		4,569
	Stock option exercises, net of withholdings and other		5,709
	Preferred stock tax distributions		(320	)
	Common stock repurchases		(3,239	)
	Balance at September 30, 2014	$	745,890

Earnings_Per_Share_Attributabl1

Earnings Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Net Income Per Share	'
	The following table presents the calculation of basic and diluted net income per share attributable to common stockholders for the three months ended September 30, 2014 and 2013:
		Three Months Ended September 30, 2014							Three Months Ended September 30, 2013
		Income			Shares		Per  Share		Income			Shares		Per  Share
		(Numerator)			(Denominator)		Amount		(Numerator)			(Denominator)		Amount
		(in thousands, except per share data)
	Net income	$	6,453						$	2,054
	Preferred stock tax distributions		—							(425	)
	Basic EPS
	Net income attributable to common stockholders		6,453			79,426	$	0.08		1,629			45,072	$	0.04
	Effect of Dilutive Securities
	Preferred stock		—			—				425			15,902
	Stock options		—			3,345				—			2,140
	Diluted EPS
	Net income attributable to common stockholders	$	6,453			82,771	$	0.08	$	2,054			63,114	$	0.03
	The following table presents the calculation of basic and diluted net income per share attributable to common stock holders for the nine months ended September 30, 2014 and 2013:
		Nine Months Ended September 30, 2014							Nine Months Ended September 30, 2013
		Income			Shares		Per  Share		Income			Shares		Per  Share
		(Numerator)			(Denominator)		Amount		(Numerator)			(Denominator)		Amount
		(in thousands, except per share data)
	Net income	$	13,498						$	5,133
	Preferred stock tax distributions		(320	)						(1,073	)
	Basic EPS
	Net income attributable to common stockholders		13,178			70,893	$	0.19		4,060			35,936	$	0.11
	Effect of Dilutive Securities
	Preferred stock		320			6,640				1,073			12,758
	Stock options		—			3,293				—			1,248
	Diluted EPS
	Net income attributable to common stockholders	$	13,498			80,826	$	0.17	$	5,133			49,942	$	0.1

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Fair Value Assets Measured on Recurring Basis	'
	The following table presents the balances of assets measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013:
		30-Sep-14											31-Dec-13
		Level 1				Level 2			Level 3				Level 1		Level 2		Level 3
		(in thousands)
	Money market funds	$	4,205			$	19,496		$	—			$	4,200	$	—	$	—
	Commercial paper		—				33,218			—				—		—		—
	Corporate bonds		—				42,086			—				—		—		—
	Redeemable common stock		—				—			—				—		—		18,415
	Total	$	4,205			$	94,800		$	—			$	4,200	$	—	$	18,415
Schedule of Fair Value, Valuation Techniques and Related Unobservable Inputs	'
	The following table presents the fair value, valuation techniques and related unobservable inputs for the Level 3 measurement as of December 31, 2013:
				Fair value measurement							Range
				(Level 3)
				(in thousands)
				31-Dec-13				Valuation technique	Unobservable input		31-Dec-13
	Redeemable common stock			$	18,415			Probability Weighted	Discount rate			15.3	%
								Expected Return Method	Lack of marketability per common share			14.9	%

Organization_and_Reorganizatio1

Organization and Reorganization - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, except Share data, unless otherwise specified	Apr. 04, 2014	Apr. 04, 2014	Apr. 04, 2014	Apr. 04, 2014	Apr. 04, 2014	Apr. 04, 2014	Sep. 03, 2014	Sep. 03, 2014	Sep. 30, 2014	Sep. 03, 2014	Sep. 03, 2014
	IPO	IPO	IPO	IPO	IPO	IPO	Follow-on Offering	Follow-on Offering	Follow-on Offering	Follow-on Offering	Follow-on Offering
		Common Stock	Selling stockholders	Underwriting discounts and commissions	Other Offering Costs	Common Class A		Common Stock	Selling stockholders	Underwriting discounts and commissions	Other Offering Costs
			Common Stock						Common Stock
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Issuance of common stock	'	'	3,405,614	'	'	4,000,000	'	1,250,000	9,218,198	'	'
Issuance of common stock price per share	'	'	'	'	'	$26	'	$40.25	'	'	'
Net proceeds	$94.90	'	'	'	'	'	$48	'	'	'	'
Offering expenses	'	'	'	$6.50	$2.60	'	'	'	'	$1.90	$0.40
Number of options to purchase shares of common stock offered to underwriters	'	'	1,110,842	'	'	'	'	'	1,570,229	'	'
Number of Series A preferred stock shares converted into common stock	'	19,284,113	'	'	'	'	'	'	'	'	'

Significant_Accounting_Policie2

Significant Accounting Policies - Additional Information (Detail)	0 Months Ended	9 Months Ended
	Apr. 02, 2014	Sep. 30, 2014
Accounting Policies [Abstract]	'	'
Reverse stock split description	'	'On April 2, 2014, the Company effected a 1-for-2 reverse stock split of its issued and outstanding common stock and preferred stock. Any fractional shares resulting from the reverse stock split were rounded up to the nearest whole share.
Reverse stock split ratio	0.5	'

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Aug. 08, 2013	Sep. 30, 2013	Sep. 30, 2013	Aug. 08, 2013	Aug. 08, 2013	Aug. 08, 2013
			GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc
				General and administrative expenses	General and administrative expenses	Non-vested stock options	Common Stock	Preferred Stock
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Business acquisitions, share issued	'	'	'	'	'	'	23,318,580	8,098,430
Acquisition date	'	'	8-Aug-13	'	'	'	'	'
Fair value of shares issued	$421,485,000	'	$421,485,000	'	'	$11,000,000	'	'
Unrecognized compensation expense	'	20,000,000	'	'	'	12,500,000	'	'
Direct and indirect expense incurred related to merger	'	'	'	$1,300,000	$4,700,000	'	'	'

Schedule_of_AcquisitionDate_Fa

Schedule of Acquisition-Date Fair Value of Assets and Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Aug. 08, 2013	Aug. 08, 2013	Aug. 08, 2013	Aug. 08, 2013
In Thousands, unless otherwise specified			GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc	GrubHub Holdings Inc
				Trademarks	Customer Relationships	Developed technology
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	'	'	'

Pro_forma_Summary_of_Operation

Pro forma Summary of Operation (Detail) (GrubHub Holdings Inc, USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
GrubHub Holdings Inc	'	'
Business Acquisition [Line Items]	'	'
Revenues	$41,035	$121,062
Net income	$1,473	$2,246

Pro_Forma_Adjustments_for_Addi

Pro Forma Adjustments for Additional Amortization of That Would Have Been Recognized on the Intangible Assets (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]	'	'	'	'
Amortization of intangible assets	'	'	$13,170	$5,371
Stock-based compensation	2,300	1,800	6,981	3,024
Income tax expense (benefit)	5,252	1,111	15,213	4,822
GrubHub Holdings Inc | Pro Forma	'	'	'	'
Business Acquisition Pro Forma Information Nonrecurring Adjustment [Line Items]	'	'	'	'
Amortization of intangible assets	'	1,141	'	6,475
Stock-based compensation	'	573	'	2,997
Transaction costs	'	-1,701	'	-9,131
Income tax expense (benefit)	'	$17	'	($2,750)

Summary_of_HeldtoMaturity_Mark

Summary of Held-to-Maturity Marketable Securities (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Schedule Of Held To Maturity Securities [Line Items]	'
Amortized Cost	$75,335
Unrealized Gains	2
Unrealized Losses	-33
Estimated Fair Value	75,304
Commercial Paper | Cash and Cash Equivalents	'
Schedule Of Held To Maturity Securities [Line Items]	'
Amortized Cost	8,999
Unrealized Losses	-1
Estimated Fair Value	8,998
Commercial Paper | Short Term Investments	'
Schedule Of Held To Maturity Securities [Line Items]	'
Amortized Cost	24,228
Unrealized Losses	-8
Estimated Fair Value	24,220
Corporate Bonds | Cash and Cash Equivalents	'
Schedule Of Held To Maturity Securities [Line Items]	'
Amortized Cost	600
Estimated Fair Value	600
Corporate Bonds | Short Term Investments	'
Schedule Of Held To Maturity Securities [Line Items]	'
Amortized Cost	41,508
Unrealized Gains	2
Unrealized Losses	-24
Estimated Fair Value	$41,486

Summary_of_Continuous_Unrealiz

Summary of Continuous Unrealized Loss on Marketable Securities (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Schedule Of Held To Maturity Securities [Line Items]	'
Estimated Fair Value, Less Than 12 Months	$65,974
Unrealized Loss, Less Than 12 Months	-33
Estimated Fair Value, 12 Months or Greater	0
Unrealized Loss, 12 Months or Greater	0
Estimated Fair Value, Total	65,974
Unrealized Loss, Total	-33
Commercial Paper	'
Schedule Of Held To Maturity Securities [Line Items]	'
Estimated Fair Value, Less Than 12 Months	33,218
Unrealized Loss, Less Than 12 Months	-9
Estimated Fair Value, 12 Months or Greater	0
Unrealized Loss, 12 Months or Greater	0
Estimated Fair Value, Total	33,218
Unrealized Loss, Total	-9
Corporate Bonds	'
Schedule Of Held To Maturity Securities [Line Items]	'
Estimated Fair Value, Less Than 12 Months	32,756
Unrealized Loss, Less Than 12 Months	-24
Estimated Fair Value, 12 Months or Greater	0
Unrealized Loss, 12 Months or Greater	0
Estimated Fair Value, Total	32,756
Unrealized Loss, Total	($24)

Components_of_Acquired_Intangi

Components of Acquired Intangible Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Intangible Assets [Line Items]	'	'
Amortizable intangible assets, Gross Carrying Amount	$197,122	$197,122
Amortizable intangible assets, Accumulated Amortization	-28,934	-18,357
Amortizable intangible assets, Net Carrying Value	168,188	178,765
Indefinite-lived trademarks	89,676	89,676
Total acquired intangible assets, Gross Carrying Amount	286,798	286,798
Total acquired intangible assets, Net Carrying Value	257,864	268,441
Developed technology	'	'
Intangible Assets [Line Items]	'	'
Amortizable intangible assets, Gross Carrying Amount	5,143	5,143
Amortizable intangible assets, Accumulated Amortization	-1,963	-677
Amortizable intangible assets, Net Carrying Value	3,180	4,466
Customer Relationships	'	'
Intangible Assets [Line Items]	'	'
Amortizable intangible assets, Gross Carrying Amount	191,979	191,979
Amortizable intangible assets, Accumulated Amortization	-26,971	-17,680
Amortizable intangible assets, Net Carrying Value	$165,008	$174,299

Goodwill_and_Acquired_Intangib2

Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill And Other Intangible Assets [Line Items]	'	'	'	'
Intangible asset amortization	'	'	$13,170,000	$5,371,000
Changes in the carrying amount of goodwill	'	'	0	'
Other Intangible Assets	'	'	'	'
Goodwill And Other Intangible Assets [Line Items]	'	'	'	'
Intangible asset amortization	$3,600,000	$2,300,000	$10,600,000	$3,400,000

Estimated_Future_Amortization_

Estimated Future Amortization of Acquired Intangible Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
The remainder of 2014	$3,525	'
2015	14,102	'
2016	13,344	'
2017	12,068	'
2018	12,068	'
Thereafter	113,081	'
Amortizable intangible assets, Net Carrying Value	$168,188	$178,765

Components_of_Property_and_Equ

Components of Property and Equipment (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]	'	'
Property and equipment	$39,743	$34,089
Accumulated amortization and depreciation	-23,294	-16,993
Property and equipment, net	16,449	17,096
Computer equipment	'	'
Property Plant And Equipment [Line Items]	'	'
Property and equipment	12,204	9,739
Furniture and fixtures	'	'
Property Plant And Equipment [Line Items]	'	'
Property and equipment	2,530	2,176
Software Development	'	'
Property Plant And Equipment [Line Items]	'	'
Property and equipment	16,406	13,930
Purchased Software	'	'
Property Plant And Equipment [Line Items]	'	'
Property and equipment	2,129	2,124
Leasehold Improvements	'	'
Property Plant And Equipment [Line Items]	'	'
Property and equipment	$6,474	$6,120

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property Plant And Equipment [Line Items]	'	'	'	'
Depreciation and amortization	$5,748,000	$3,821,000	$16,878,000	$7,494,000
Capitalized developed software costs	1,300,000	500,000	2,400,000	1,900,000
Developed software costs amortization expense	700,000	1,000,000	2,100,000	2,000,000
Property And Equipment Excluding Developed Software	'	'	'	'
Property Plant And Equipment [Line Items]	'	'	'	'
Depreciation and amortization	$1,500,000	$500,000	$4,200,000	$2,100,000

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Loss Contingencies [Line Items]	'	'
Litigation reserve	$200,000	$200,000
Litigation reserve before recoveries	600,000	600,000
Estimated Insurance Recoveries	400,000	400,000
Restructuring expense	700,000	1,162,000
Facility Closing	'	'
Loss Contingencies [Line Items]	'	'
Total estimated restructuring cost	1,200,000	1,200,000
Contract Termination	'	'
Loss Contingencies [Line Items]	'	'
Restructuring expense	500,000	'
Merger Income Tax Consequences	'	'
Loss Contingencies [Line Items]	'	'
Indemnification related to business combination	$15,000,000	$15,000,000

Summary_of_Restructuring_Activ

Summary of Restructuring Activity (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014
Restructuring And Related Activities [Abstract]	'	'
Restructuring accrual balance at Beginning of period	'	$176
Restructuring expense	700	1,162
Cash payments	'	-664
Restructuring accrual balance at end of period	$674	$674

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Aug. 08, 2013	Aug. 08, 2013
					Non-vested stock options	GrubHub Holdings Inc	GrubHub Holdings Inc
							Non-vested stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]	'	'	'	'	'	'	'
Fair value of shares issued	'	'	'	$421,485,000	'	$421,485,000	$11,000,000
Unrecognized compensation expense	20,000,000	'	20,000,000	'	'	'	12,500,000
Number of stock options granted	'	'	1,838,073	3,669,958	'	'	'
Aggregate intrinsic value of awards exercised	35,700,000	800,000	47,300,000	900,000	'	'	'
Stock-based compensation	2,300,000	1,800,000	6,981,000	3,024,000	'	'	'
Unrecognized compensation expense recognition period	'	'	'	'	'2 years 11 months 19 days	'	'
Excess tax benefit related to stock-based compensation, decrease in operating Activities	'	'	4,569,000	0	'	'	'
Excess tax benefit related to stock-based compensation	'	'	$4,569,000	$0	'	'	'

Assumptions_Used_to_Determine_

Assumptions Used to Determine Fair Value of Stock Options Granted (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'		'
Weighted average fair value options granted	$13.54		$7.96
Average risk-free interest rate	1.99%		1.40%
Expected stock price volatilities	50.40%	[1]	50.70%	[1]
Dividend yield	0.00%		0.00%
Expected stock option life (years)	'6 years 3 months 11 days		'5 years 2 months 12 days
[1]	There was no active external or internal market for the Company’s shares until April of 2014. Thus, it was not possible to estimate the expected volatility of the Company’s share price in estimating fair value of options granted. As a substitute for such volatility, the Company used the historical volatility of comparable companies.

Stock_Option_Activity_Detail

Stock Option Activity (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Options	'	'	'
Options, Beginning Balance	7,669,553	'	'
Options, Granted	1,838,073	3,669,958	'
Options, Forfeited	-713,754	'	'
Options, Exercised	-1,674,905	'	'
Options, Ending Balance	7,118,967	'	7,669,553
Options, Vested and expected to vest	5,588,472	'	'
Options, Exercisable	2,932,418	'	'
Weighted Average Exercise Price	'	'	'
Weighted Average Exercise Price, Beginning Balance	$4.08	'	'
Weighted Average Exercise Price, Granted	$16.66	'	'
Weighted Average Exercise Price, Forfeited	$5.94	'	'
Weighted Average Exercise Price, Exercised	$3.48	'	'
Weighted Average Exercise Price, Ending Balance	$7.29	'	$4.08
Weighted Average Exercise Price, Vested and expected to vest	$6.32	'	'
Weighted Average Exercise Price, Exercisable	$4.02	'	'
Average Intrinsic Value/Weighted Average Exercise Term	'	'	'
Average Intrinsic Value	$192,800	'	$56,844
Average Intrinsic Value, Vested and expected to vest	156,604	'	'
Average Intrinsic Value, Exercisable	$88,612	'	'
Weighted Average Exercise Term, Outstanding Balance	'8 years	'	'8 years 3 months 15 days
Weighted Average Exercise Term, Vested and expected to vest	'7 years 10 months 2 days	'	'
Weighted Average Exercise Term, Exercisable	'7 years 5 months 12 days	'	'

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

0 Months Ended

9 Months Ended

0 Months Ended

0 Months Ended

Apr. 04, 2014

Sep. 30, 2014

Dec. 31, 2013

Apr. 04, 2014

Apr. 04, 2014

Apr. 04, 2014

Apr. 04, 2014

Sep. 03, 2014

Sep. 03, 2014

Sep. 03, 2014

Sep. 03, 2014

Apr. 04, 2014

Apr. 04, 2014

IPO

IPO

IPO

IPO

Follow-on Offering

Follow-on Offering

Follow-on Offering

Follow-on Offering

Series A Preferred Stock

Common Class A

Common Stock

Underwriting discounts and commissions

Other Offering Costs

Common Stock

Underwriting discounts and commissions

Other Offering Costs

IPO

Class Of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of common shares issued upon conversion of preferred stock

'

'

'

'

'

'

'

'

'

'

'

1

'

Issuance of common stock

'

'

'

'

'

'

'

'

1,250,000

'

'

'

4,000,000

Issuance of common stock price per share

'

'

'

'

'

'

'

'

$40.25

'

'

'

$26

Net proceeds

'

'

'

$94,900,000

'

'

'

$48,000,000

'

'

'

'

'

Offering expenses

'

'

'

'

'

6,500,000

2,600,000

'

'

1,900,000

400,000

'

'

Common stock, shares authorized

'

500,000,000

165,000,000

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

'

81,042,800

53,757,437

'

'

'

'

'

'

'

'

'

'

Common stock, shares outstanding

'

81,042,800

53,757,437

'

'

'

'

'

'

'

'

'

'

Treasury stock, shares

'

0

0

'

'

'

'

'

'

'

'

'

'

Series A Convertible Preferred Stock, shares authorized

'

25,000,000

25,000,000

'

'

'

'

'

'

'

'

'

'

Aggregate shares of common stock that convertible Series A Preferred Stock automatically converted into

'

'

'

'

19,284,113

'

'

'

'

'

'

'

'

Series A Convertible Preferred Stock, shares issued

'

0

19,284,113

'

'

'

'

'

'

'

'

'

'

Series A Convertible Preferred Stock, shares outstanding

'

0

19,284,113

'

'

'

'

'

'

'

'

'

'

Series A Convertible Preferred Stock, liquidation preference

'

'

86,200,000

'

'

'

'

'

'

'

'

'

'

Shares of common stock that would require the Company to repurchase these shares at fair value determined at the redemption date

1,344,236

'

1,344,236

'

'

'

'

'

'

'

'

'

'

Redeemable common stock converted, conversion ratio

1

'

'

'

'

'

'

'

'

'

'

'

'

Initial public offering closing date

'

4-Apr-14

'

'

'

'

'

'

'

'

'

'

'

Redeemable common stock

'

'

18,415,000

'

'

'

'

'

'

'

'

'

'

Annual redemption limit

'

'

$4,000,000

'

'

'

'

'

'

'

'

'

'

Equity_and_Changes_in_Equity_D

Equity and Changes in Equity During Period (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'	'	'
Balance at beginning of period	'	'	$557,375	'
Net income	6,453	2,054	13,498	5,133
Currency translation	-298	272	-114	47
Termination of put rights of redeemable common stock in connection with the IPO	'	'	34,950	'
Issuance of common stock, net of issuance costs	'	'	142,936	'
Change in fair value of redeemable common stock	'	'	-16,535	'
Stock-based compensation	'	'	7,061	'
Tax benefit related to stock-based compensation	'	'	4,569	'
Stock option exercises, net of withholdings and other	'	'	5,709	'
Preferred stock tax distributions	'	'	-320	'
Common stock repurchases	'	'	-3,239	'
Balance at end of period	$745,890	'	$745,890	'

Earnings_Per_Share_Attributabl2

Earnings Per Share Attributable to Common Stockholders - Additional Information (Detail)	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Apr. 04, 2014
	Stock Option	Stock Option	Stock Option	Stock Option	Common Stock
					IPO
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'	'
Number of Series A preferred stock shares converted into common stock	'	'	'	'	19,284,113
Antidilutive securities excluded from computation of earnings per share, amount	233,983	476,328	233,983	476,328	'

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income	$6,453	$2,054	$13,498	$5,133
Preferred stock tax distributions	'	-425	-320	-1,073
Basic EPS	'	'	'	'
Net income attributable to common stockholders	6,453	1,629	13,178	4,060
Effect of Dilutive Securities	'	'	'	'
Preferred stock	'	425	320	1,073
Diluted EPS	'	'	'	'
Net income attributable to common stockholders	$6,453	$2,054	$13,498	$5,133
Basic EPS, Shares	'	'	'	'
Net income attributable to common stockholders, shares	79,426	45,072	70,893	35,936
Effect of Dilutive Securities, shares	'	'	'	'
Preferred stock, shares	'	15,902	6,640	12,758
Stock options, shares	3,345	2,140	3,293	1,248
Diluted EPS, shares	'	'	'	'
Net income attributable to common stockholders plus assumed conversions, shares	82,771	63,114	80,826	49,942
Basic EPS, per share amount	'	'	'	'
Net income attributable to common stockholders, per share amount	$0.08	$0.04	$0.19	$0.11
Diluted EPS, per share amount	'	'	'	'
Net income attributable to common stockholders plus assumed conversions, per share amount	$0.08	$0.03	$0.17	$0.10

Schedule_of_Fair_Value_Assets_

Schedule of Fair Value Assets Measured on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Level 1	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	$4,205	$4,200
Level 1 | Money Market Funds	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	4,205	4,200
Level 2	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	94,800	'
Level 2 | Money Market Funds	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	19,496	'
Level 2 | Commercial Paper	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	33,218	'
Level 2 | Corporate Bonds	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	42,086	'
Level 3	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	'	18,415
Level 3 | Redeemable Common Stock	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'
Assets, fair value disclosure	'	$18,415

Fair_Value_Measurement_Additio

Fair Value Measurement - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]	'
Initial public offering closing date	4-Apr-14
Fair Value, Inputs, Level 3	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]	'
Initial public offering closing date	4-Apr-14

Schedule_of_Fair_Value_Valuati

Schedule of Fair Value, Valuation Techniques and Related Unobservable Inputs (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]	'	'
Redeemable common stock	'	$18,415
Valuation Technique	'Probability Weighted Expected Return Method	'
Discount rate	'	15.30%
Lack of marketability per common share	'	14.90%
Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]	'	'
Redeemable common stock	'	$18,415