Endurance International 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	EIGI
Entity Registrant Name	Endurance International Group Holdings, Inc.
Entity Central Index Key	1,237,746
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		143,117,504

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 81,409	$ 53,596
Restricted cash	3,401	3,302
Accounts receivable	11,664	13,088
Prepaid domain name registry fees	56,710	55,444
Prepaid expenses and other current assets	28,844	28,678
Total current assets	182,028	154,108
Property and equipment—net	94,625	95,272
Goodwill	1,861,608	1,859,909
Other intangible assets—net	544,990	612,057
Deferred financing costs	4,089	4,932
Investments	15,846	15,857
Prepaid domain name registry fees, net of current portion	10,789	10,429
Other assets	2,504	3,710
Total assets	2,716,479	2,756,274
Current liabilities:
Accounts payable	12,841	16,074
Accrued expenses	75,088	67,722
Accrued interest	20,088	27,246
Deferred revenue	369,825	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	4,481	6,690
Deferred consideration—short term	4,250	5,273
Other current liabilities	2,947	2,890
Total current liabilities	523,465	516,785
Long-term deferred revenue	91,256	89,200
Notes payable—long term, net of original issue discounts of $25,853 and $27,939 and deferred financing costs of $43,342 and $40,622, respectively	1,936,258	1,951,280
Capital lease obligations—long term	1,537	512
Deferred tax liability	44,060	39,943
Deferred consideration—long term	3,437	7,444
Other liabilities	9,862	8,974
Total liabilities	2,609,875	2,614,138
Redeemable non-controlling interest	25,000	17,753
Commitments and contingencies (Note 17)
Stockholders’ equity:
Preferred Stock—par value $0.0001; 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common Stock—par value $0.0001; 500,000,000 shares authorized; 134,793,857 and 137,503,270 shares issued at December 31, 2016 and June 30, 2017, respectively; 134,793,857 and 137,503,270 outstanding at December 31, 2016 and June 30, 2017, respectively	14	14
Additional paid-in capital	898,445	868,228
Accumulated other comprehensive loss	(2,144)	(3,666)
Accumulated deficit	(814,711)	(740,193)
Total stockholders’ equity	81,604	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ 2,716,479	$ 2,756,274

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Notes payable-long term original issue discounts, net	$ 27,939	$ 25,853
Deferred financing costs	$ 40,622	$ 43,342
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	137,503,270	134,793,857
Common stock, shares outstanding (in shares)	137,503,270	134,793,857

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 292,258	$ 290,713	$ 587,395	$ 527,826
Cost of revenue	146,583	153,077	295,332	289,553
Gross profit	145,675	137,636	292,063	238,273
Operating expense:
Sales and marketing	72,106	80,309	144,878	159,603
Engineering and development	20,149	27,687	40,511	43,942
General and administrative	40,580	34,830	79,660	75,109
Transactions expenses	193	978	773	32,098
Total operating expense	133,028	143,804	265,822	310,752
Income (loss) from operations	12,647	(6,168)	26,241	(72,479)
Other income (expense):
Other income	0	0	0	11,410
Interest income	185	142	303	276
Interest expense	(45,658)	(40,994)	(85,174)	(71,365)
Total other expense—net	(45,473)	(40,852)	(84,871)	(59,679)
Loss before income taxes and equity earnings of unconsolidated entities	(32,826)	(47,020)	(58,630)	(132,158)
Income tax expense (benefit)	2,628	(13,931)	8,402	(113,833)
Loss before equity earnings of unconsolidated entities	(35,454)	(33,089)	(67,032)	(18,325)
Equity loss (income) of unconsolidated entities, net of tax	(39)	341	(39)	1,024
Net loss	(35,415)	(33,430)	(66,993)	(19,349)
Net (loss) income attributable to non-controlling interest	51	(5,390)	277	(13,120)
Excess accretion of non-controlling interest	3,663	0	7,247	0
Total net (loss) income attributable to non-controlling interest	3,714	(5,390)	7,524	(13,120)
Net loss attributable to Endurance International Group Holdings, Inc.	(39,129)	(28,040)	(74,517)	(6,229)
Comprehensive income (loss):
Foreign currency translation adjustments	1,228	540	1,914	882
Unrealized loss on cash flow hedge, net of taxes of $(218) and $(192), and $(824) and $(230) for the three and six months ended June 30, 2016 and 2017, respectively	(176)	(427)	(392)	(1,938)
Total comprehensive loss	$ (38,077)	$ (27,927)	$ (72,995)	$ (7,285)
Earnings Per Share, Basic and Diluted
Basic net income (loss) per share (in usd per share)	$ (0.29)	$ (0.21)	$ (0.55)	$ (0.05)
Diluted net income (loss) per share (in usd per share)	$ (0.29)	$ (0.21)	$ (0.55)	$ (0.05)
Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	137,295,120	132,566,622	136,124,347	132,736,382
Weighted average number of diluted shares outstanding (in shares)	137,295,120	132,566,622	136,124,347	132,736,382

Consolidated Statements of Ope5

Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Unrealized gain (loss) arising during period, tax	$ (192)	$ (218)	$ (230)	$ (824)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (66,993)	$ (19,349)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property and equipment	27,162	29,932
Amortization of other intangible assets	69,207	67,697
Impairment of long lived assets	0	8,285
Amortization of deferred financing costs	3,530	2,562
Amortization of net present value of deferred consideration	377	1,582
Dividend from minority interest	50	50
Amortization of original issue discounts	1,732	1,272
Stock-based compensation	29,169	33,412
Deferred tax (benefit) expense	4,346	(117,462)
(Gain) loss on sale of assets	(128)	(225)
(Gain) loss from unconsolidated entities	(39)	(10,386)
Financing costs expensed	5,487	0
Loss on early extinguishment of debt	992	0
(Gain) loss from change in deferred consideration	0	21
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	1,359	1,546
Prepaid expenses and other current assets	(1,343)	(14,886)
Accounts payable and accrued expenses	(9,004)	26,517
Deferred revenue	16,518	55,047
Net cash provided by operating activities	82,422	65,615
Cash flows from investing activities:
Businesses acquired in purchase transactions, net of cash acquired	0	(899,889)
Cash paid for minority investment	0	(5,600)
Purchases of property and equipment	(19,295)	(20,961)
Proceeds from sale of assets	287	252
Purchases of intangible assets	(1,680)	(27)
Withdrawals of principal balances in restricted cash accounts	(100)	(768)
Net cash used in investing activities	(20,788)	(926,993)
Cash flows from financing activities:
Proceeds from issuance of term loan and notes, net of original issue discounts	1,693,007	1,056,178
Repayments of term loans	(1,714,661)	(33,850)
Proceeds from borrowing of revolver	0	16,000
Repayment of revolver	0	(83,000)
Payment of financing costs	(6,060)	(51,727)
Payment of deferred consideration	(5,408)	(707)
Principal payments on capital lease obligations	(3,908)	(2,896)
Capital investment from minority partner	0	1,000
Proceeds from exercise of stock options	1,132	1,328
Net cash provided by (used in) financing activities	(35,898)	902,326
Net effect of exchange rate on cash and cash equivalents	2,077	1,614
Net increase in cash and cash equivalents	27,813	42,562
Cash and cash equivalents:
Beginning of period	53,596	33,030
End of period	81,409	75,592
Supplemental cash flow information:
Interest paid	80,122	44,171
Income taxes paid	$ 2,459	$ 2,448

Nature of Business

Nature of Business	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Formation and Nature of Business Endurance International Group Holdings, Inc. (“Holdings”) is a Delaware corporation, which, together with its wholly owned subsidiary company, EIG Investors Corp. (“EIG Investors”), its primary operating subsidiary company, The Endurance International Group, Inc. (“EIG”), and other subsidiary companies of EIG, collectively form the “Company.” The Company is a leading provider of cloud-based platform solutions designed to help small- and medium-sized businesses succeed online. EIG and EIG Investors were incorporated in April 1997 and May 2007, respectively, and Holdings was originally formed as a limited liability company in October 2011 in connection with the acquisition by investment funds and entities affiliated with Warburg Pincus and Goldman, Sachs & Co. on December 22, 2011 of a controlling interest in EIG Investors, EIG and EIG’s subsidiary companies. On November 7, 2012, Holdings reorganized as a Delaware limited partnership and on June 25, 2013, Holdings converted into a Delaware C-corporation and changed its name to Endurance International Group Holdings, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions were eliminated on consolidation. Segment Information The Company has reviewed the criteria of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 280-10, Segment Reporting , and determined that the Company is comprised of two segments for reporting purposes: web presence and email marketing. The web presence segment consists predominantly of the Company's web hosting brands and related products such as domain names, website security tools, website design tools and services, ecommerce tools and other services designed to grow the online presence of a small business. The email marketing segment consists of Constant Contact email marketing tools and the SinglePlatform digital storefront product, both of which the Company acquired in the February 2016 acquisition of Constant Contact, Inc. ("Constant Contact"). Use of Estimates U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates, judgments and assumptions used in preparing the accompanying consolidated financial statements are based on the relevant facts and circumstances as of the date of the consolidated financial statements. Although the Company regularly assesses these estimates, judgments and assumptions used in preparing the consolidated financial statements, actual results could differ from those estimates. Changes in estimates are recorded in the period in which they become known. The more significant estimates reflected in these consolidated financial statements include estimates of fair value of assets acquired and liabilities assumed under purchase accounting related to the Company’s acquisitions and when evaluating goodwill and long-lived assets for potential impairment, the estimated useful lives of intangible and depreciable assets, revenue recognition for multiple-element arrangements, stock-based compensation, contingent consideration, derivative instruments, certain accruals, reserves and deferred taxes. Unaudited Interim Financial Information The accompanying interim consolidated balance sheet as of June 30, 2017 , and the related consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2016 and 2017 , cash flows for the six months ended June 30, 2016 and 2017 , and the notes to consolidated financial statements are unaudited. These unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements. The unaudited consolidated financial statements include, in the opinion of management, all adjustments, consisting only of normal recurring adjustments that are necessary for a fair presentation of the Company’s financial position at June 30, 2017 , results of operations for the three and six months ended June 30, 2016 and 2017 and cash flows for the six months ended June 30, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive loss are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2017 . Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable. Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period. Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging, or ASC 815, provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in FASB Accounting Standards Update ("ASU") 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, Internal-Use Software. Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable. The Company capitalized internal-use software development costs of $3.8 million and $6.4 million , respectively, during the three and six months ended June 30, 2016, and $3.3 million and $6.2 million , respectively, during the three and six months ended June 30, 2017 . Goodwill Goodwill relates to amounts that arose in connection with the Company’s various business combinations and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, including a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. Additionally, the reorganization or change in the number of reporting units could result in the reassignment of goodwill between reporting units and may trigger an impairment assessment. In accordance with ASC 350, Intangibles—Goodwill and Other , or ASC 350, the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. Under U.S. GAAP, a reporting unit is either the equivalent of, or one level below, an operating segment. As of December 31, 2016, the Company determined it operates in two segments and that each segment is its own reporting unit, and as such, the Company has two reporting units, email marketing and web presence. The provisions of ASC 350 require that a two-step impairment test be performed for goodwill. In the first step, the Company compares the fair value of its reporting unit to which goodwill has been allocated to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. As of December 31, 2016, the Company determined fair values for each of the reporting units based on consideration of the income approach, the market comparable approach and the market transaction approach. For purposes of the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses its internal forecasts to estimate future after-tax cash flows and include an estimate of long-term future growth rates based on its most recent views of the long-term outlook for each reporting unit. Actual results may differ from those assumed in our forecasts. The Company derived its discount rates using the weighted average cost of capital, using betas observed in its industry and published rates for industries relevant to our reporting units. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the respective business and its internally developed forecasts. Discount rates used in the Company's reporting unit valuations ranged from 11.0% to 12.0% . For purposes of the market approach, the Company uses a valuation technique in which values are derived based on market prices of comparable publicly traded companies. The Company also uses a market based valuation technique in which values are determined based on relevant observable information generated by market transactions involving comparable businesses. The Company assesses each valuation methodology based upon the relevance and availability of the data at the time it performs the valuation and weights the methodologies appropriately. The carrying values of the reporting units were determined through specific allocation of assets and liabilities to the reporting units, and an apportionment method relating to our debt, whereby debt that was incurred in order to finance the acquisition of assets or businesses of a reporting unit was allocated to that reporting unit. In prior years, the Company had only one reporting unit. Subsequent to the acquisition of Constant Contact, and as described in Note 19: Segment Information , the Company determined that there is a second reporting unit relating to email marketing. The Company has allocated the fair value of the goodwill acquired through its acquisitions to the applicable reporting unit, and allocated the fair value of the goodwill acquired through its acquisition of Constant Contact to its email marketing reporting unit. As of the Company's assessment date for 2016, the estimated fair values of its reporting units exceeded their carrying values and the Company concluded, based on the first step of the process, that no impairment existed as of that date in either of its reporting units. As of June 30, 2017, the Company did not have a reporting unit for which it is reasonably likely that it will fail step one of a goodwill impairment test in the near term. However, if macroeconomic conditions worsen or the Company's current financial projections are not achieved, it is possible that the Company may experience impairments for some of its intangible assets, which may require it to recognize impairment charges. As of December 31, 2016 , the carrying value of goodwill that was allocated to the email marketing reporting unit and the web presence reporting unit was $604.3 million and $1,255.6 million , respectively. As of December 31, 2016, the fair value of the web presence segment exceeded the carrying value of its net assets by 67% and the fair value of the email marketing segment exceeded the carrying value of its net assets by 35% . As of June 30, 2017 , the carrying value of goodwill that was allocated to the email marketing reporting unit and the web presence reporting unit was $604.3 million and $1,257.3 million , respectively. The Company had goodwill of $1.9 billion as of December 31, 2016 and June 30, 2017 , and no impairment charges have been recorded to date. Long-Lived Assets The Company’s long-lived assets consist primarily of intangible assets, including acquired subscriber relationships, trade names, intellectual property, developed technology, domain names available for sale and in-process research and development (“IPR&D”). The Company also has long-lived tangible assets, primarily consisting of property and equipment. The majority of the Company’s intangible assets are recorded in connection with its various acquisitions. The Company’s intangible assets are recorded at fair value at the time of their acquisition. The Company amortizes intangible assets over their estimated useful lives. Determination of the estimated useful lives of the individual categories of intangible assets is based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives other than developed technology is recognized in accordance with their estimated projected cash flows. Developed technology is amortized on a straight line basis over the estimated useful economic life which has a weighted average useful life of 7 years . The Company evaluates long-lived intangible and tangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. No such impairment losses have been identified in the three and six months ended June 30, 2016 and 2017 . Indefinite life intangible assets include domain names that are available for sale which are recorded at cost to acquire. These assets are not being amortized and are being tested for impairment annually and whenever events or changes in circumstance indicate that their carrying value may not be recoverable. When a domain name is sold, the Company records the cost of the domain in cost of revenue. Acquired In-Process Research and Development (IPR&D) Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires in connection with business combinations that have not been completed at the date of acquisition. The acquired IPR&D is capitalized as an intangible asset and reviewed on a quarterly basis to determine future use. Any impairment loss of the acquired IPR&D is charged to expense in the period the impairment is identified. During the six months ended June 30, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired as these projects were abandoned during the three months ended March 31, 2016. At that time, the Company recorded a $ 1.4 million impairment charge, which is reflected in engineering and development expense in the Company’s consolidated statements of operations and comprehensive loss. No such impairment loss was identified during the six months ended June 30, 2017 . Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period, whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of FASB ASU No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force, and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, and other cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The Company analyzes the selling prices used in its allocation of transaction amount, at a minimum, on a quarterly basis. Selling prices are analyzed on a more frequent basis if a significant change in the business necessitates a more timely analysis. The Company maintains a reserve for refunds and chargebacks related to revenue that has been recognized and is expected to be refunded. The Company had a refund and chargeback reserve of $0.6 million and $0.5 million as of December 31, 2016 and June 30, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and June 30, 2017 was $2.1 million . Based on refund history, approximately 84% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 95% of all refunds happen within 45 days of the contract start or renewal date. Income Taxes Income taxes are accounted for in accordance with ASC 740, Accounting for Income Taxes , or ASC 740. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. ASC 740 clarifies the accounting for income taxes by prescribing a minimum recognition threshold that a tax position is required to meet before being recognized in the financial statements. The Company recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is more likely than not to be realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. There were no unrecognized tax benefits in the three or six months ended June 30, 2016 and 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. During the three and six months ended June 30, 2016 and 2017 , the Company did not recognize any interest or penalties related to unrecognized tax benefits. Stock-Based Compensation The Company may issue restricted stock units, restricted stock awards and stock options which vest upon the satisfaction of a performance condition and/or a service condition. The Company follows the provisions of ASC 718, Compensation—Stock Compensation , or ASC 718, which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods, net of estimated forfeitures. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. In addition, for stock-based awards where vesting is dependent upon achieving certain performance goals, the Company estimates the likelihood of achieving the performance goals against established performance targets. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards granted, the Company estimates the fair value of each restricted stock award based on the closing trading price of its common stock on the date of grant. Net Loss per Share The Company considered ASC 260-10, Earnings per Share , or ASC 260-10, which requires the presentation of both basic and diluted earnings per share in the consolidated statements of operations and comprehensive loss. The Company’s basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period, and, if there are dilutive securities, diluted income per share is computed by including common stock equivalents which includes shares issuable upon the exercise of stock options, net of shares assumed to have been purchased with the proceeds, using the treasury stock method. Three Months Ended Six Months Ended 2016 2017 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net income (loss) attributable to Endurance International Group Holdings, Inc. $ (28,040 ) $ (39,129 ) $ (6,229 ) $ (74,517 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net loss per share attributable to Endurance International Group Holdings Inc. $ (0.21 ) $ (0.29 ) $ (0.05 ) $ (0.55 ) Diluted net loss per share attributable to Endurance International Group Holdings Inc. $ (0.21 ) $ (0.29 ) $ (0.05 ) $ (0.55 ) Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.: Basic 132,566,622 137,295,120 132,736,382 136,124,347 Diluted 132,566,622 137,295,120 132,736,382 136,124,347 The following number of weighted average potentially dilutive shares were excluded from the calculation of diluted loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2017 2016 2017 (unaudited) Restricted stock awards and units 9,014,101 2,472,180 8,138,075 3,212,653 Options 11,194,982 10,609,589 9,972,490 10,831,922 Total 20,209,083 13,081,769 18,110,565 14,044,575 Recent Accounting Pronouncements - Recently Adopted In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the consolidated statements of cash flows. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 which required it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that included the interim period of adoption. The impact of the adoption resulted in the following: • Due to the Company's net shortfall position upon the time of adoption, the new standard resulted in additional tax expense in our provision for income taxes rather than paid-in capital of $0.9 million for the year ended December 31, 2016. The Company's beginning retained earnings was not impacted by the early adoption as the Company had a full valuation allowance against the U.S. deferred tax assets as of December 31, 2015. • As a result of prior guidance that required excess tax benefits reduce taxes payable prior to recognition as an increase in paid in capital, the Company had not recognized certain deferred tax assets (loss carry-forwards) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. As of January 1, 2016, the Company had generated federal and state net operating loss carry-forwards due to excess tax benefits of $1.5 million and $0.7 million , respectively. • The Company elected to eliminate the forfeiture rate and adopted the new policy to account for forfeitures in the period that they are incurred, and applied this policy on a modified retrospective basis. The impact of eliminating the forfeiture rate increased the stock compensation recorded in 2016 by $0.9 million , which included an immaterial prior period adjustment that the Company recorded through the consolidated statement of operations and comprehensive loss for the year ended December 31, 2016. In March 2016, the FASB issued ASU No. 2016-07, Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . This new guidance removes the requirement for retroactive adjustment when an increase or decrease in the level of ownership qualifies an investment for the equity method. This amendment is effective for fiscal years beginning after December 15, 2016. The adoption of this standard did not have a material impact on the Company's financial position or results of operations. Recent Accounting Pronouncements - Recently Issued In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or Accounting Standard Update 2014-09, which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. Since then, the FASB has also issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606), Principals versus Agent Considerations and ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing , which further elaborate on the original ASU No. 2014-09. The core principle of these updates is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more ju

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions The Company accounts for the acquisitions of businesses using the purchase method of accounting. The Company allocates the purchase price to the tangible and identifiable intangible assets and liabilities assumed based on their estimated fair values. Purchased identifiable intangible assets typically include subscriber relationships, trade names, domain names held for sale, developed technology and IPR&D. The methodologies used to determine the fair value assigned to subscriber relationships and domain names held for sale are typically based on the excess earnings method that considers the return received from the intangible asset and includes certain expenses and also considers an attrition rate based on the Company’s internal subscriber analysis and an estimate of the average life of the subscribers. The fair value assigned to trade names is typically based on the income approach using a relief from royalty methodology that assumes that the fair value of a trade name can be measured by estimating the cost of licensing and paying a royalty fee for the trade name that the owner of the trade name avoids. The fair value assigned to developed technology typically uses the cost approach. The fair value assigned to IPR&D is based on the cost approach. If applicable, the Company estimates the fair value of contingent consideration payments in determining the purchase price. The contingent consideration is then adjusted to fair value in subsequent periods as an increase or decrease in current earnings in general and administrative expense in the consolidated statements of operations and comprehensive loss. Constant Contact, Inc. On February 9, 2016, the Company acquired all of the outstanding shares of common stock of Constant Contact for $ 32.00 per share in cash, for a total purchase price of approximately $ 1.1 billion . Constant Contact is a leading provider of online marketing tools that are designed for small organizations, including small businesses, associations and non-profits. The aggregate purchase price of $ 1.1 billion , which was paid in cash at the closing, was allocated to intangible assets consisting of subscriber relationships, developed technology and trade names of $ 263.0 million , $ 83.0 million and $ 52.0 million , respectively, goodwill of $ 604.3 million , property and equipment of $ 39.6 million , and working capital of $ 184.2 million , offset by net a net deferred tax liability of $ 125.1 million and deferred revenue of $ 25.2 million . The goodwill reflects the value of expected synergies. Goodwill related to the acquisition, which is included in the Company’s email marketing reporting unit, is not deductible for tax purposes. Summary of Deferred Consideration Related to Acquisitions Components of short-term and long-tern deferred consideration as of December 31, 2016 and June 30, 2017 , consisted of the following: December 31, 2016 June 30, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — — — Social Booster (Acquired in 2016) 40 25 25 — AppMachine (Acquired in 2016) 4,365 7,419 4,225 3,437 Total $ 5,273 $ 7,444 $ 4,250 $ 3,437

Property and Equipment and Capi

Property and Equipment and Capital Lease Obligations	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment and Capital Lease Obligations	Property and Equipment and Capital Lease Obligations Components of property and equipment consisted of the following: December 31, 2016 June 30, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 5,610 Software 52,130 61,699 Computers and office equipment 143,091 156,603 Furniture and fixtures 10,892 10,846 Leasehold improvements 21,244 21,559 Construction in process 6,691 9,121 Property and equipment—at cost 240,355 266,228 Less accumulated depreciation (145,083 ) (171,603 ) Property and equipment—net $ 95,272 $ 94,625 Depreciation expense related to property and equipment for the three months ended June 30, 2016 and 2017 was $16.8 million and $14.1 million , respectively. Depreciation expense related to property and equipment for the six months ended June 30, 2016 and 2017 was $29.9 million and $27.2 million , respectively. Property under capital lease with a cost basis of $ 24.2 million was included in software as of June 30, 2017 . The net carrying value of property under capital lease as of June 30, 2017 was $ 5.8 million .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following valuation hierarchy is used for disclosure of the valuation inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2 inputs are quoted prices for similar assets or liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. • Level 3 inputs are unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. As of December 31, 2016 and June 30, 2017 , the Company’s financial assets or liabilities required to be measured on a recurring basis are accrued earn-out consideration payable in connection with the 2012 acquisition of certain assets of Mojoness, Inc., or Mojo, and the 2015 interest rate cap. The Company has classified its interest rate cap discussed in Note 6 below within Level 2 of the fair value hierarchy. The Company has classified its liabilities for contingent earn-out consideration related to Mojo within Level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which include probability weighted cash flows. During the six months ended June 30, 2017 , the Company paid $0.8 million related to the earn-out provisions for the Mojo acquisition, which constituted the final payment for this acquisition. Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration (included in deferred consideration) $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at June 30, 2017 Financial assets: Interest rate cap (included in other assets) $ 234 — $ 234 $ — Total financial assets $ 234 $ — $ 234 $ — The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of June 30, 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2016 $ 818 Payment of contingent earn-outs related to 2012 acquisition (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at June 30, 2017 $ —

Derivatives and Hedging Activit

Derivatives and Hedging Activities	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Risk Management Objective of Using Derivatives The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and the use of derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings. Cash Flow Hedges of Interest Rate Risk The Company entered into a three -year interest rate cap on December 9, 2015 as part of its risk management strategy. The objective of the interest rate cap, designated as a cash flow hedge, involves the receipt of variable amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium. Therefore, this derivative limits the Company’s exposure if the rate rises, but also allows the Company to benefit when the rate falls. The effective portion of changes in the fair value of derivatives that qualify as cash flow hedges is recorded in Accumulated Other Comprehensive Income ("AOCI"), and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Any ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. There was no ineffectiveness recorded in earnings for the three and six months ended June 30, 2017 . As of June 30, 2017 , the Company had one interest rate cap with $500.0 million notional value outstanding that was designated as a cash flow hedge of interest rate risk. The fair value of the interest rate contracts included in other assets on the consolidated balance sheet as of June 30, 2017 was $0.2 million , and the Company recognized $0.1 million of interest expense in the Company’s consolidated statement of operations for the three and six months ended June 30, 2017 . The Company recognized a $0.4 million loss, net of a tax benefit of $(0.2) million , in AOCI for the six months ended June 30, 2017 , of which the Company estimates that $1.3 million will be reclassified as an increase to interest expense in the next twelve months.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table summarizes the changes in the Company’s goodwill balances from December 31, 2016 to June 30, 2017 for the Company’s two reporting units: Web Presence Unit Email Marketing Unit Total Amount Amount Amount (in thousands) (in thousands) (in thousands) Goodwill balance at December 31, 2016 $ 1,255,604 $ 604,305 $ 1,859,909 Goodwill related to 2016 acquisitions — — — Foreign translation impact 1,699 — 1,699 Goodwill balance at June 30, 2017 $ 1,257,303 $ 604,305 $ 1,861,608 In accordance with ASC 350, the Company reviews goodwill and other indefinite-lived intangible assets for indicators of impairment on an annual basis and between tests if an event occurs or circumstances change that would more likely than not reduce the fair value of goodwill below its carrying amount. At December 31, 2016 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 284,005 $ 111,348 $ 172,657 7 years Subscriber relationships 659,662 345,070 314,592 7 years Trade-names 133,805 57,789 76,016 8 years Intellectual property 34,084 10,270 23,814 13 years Domain names available for sale 29,954 4,976 24,978 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2016 $ 1,141,824 $ 529,767 $ 612,057 During the six months ended June 30, 2016, the Company wrote-off acquired in-process research and development of $ 1.4 million related to its acquisition of Webzai in 2014, as the Company had abandoned certain research and development projects in favor of other projects in the quarter ended March 31, 2016, when these projects were abandoned. Additionally, during the three and six months ended June 30, 2016, the Company recorded an impairment charge of $4.4 million relating to developed technology from the Webzai acquisition, after evaluating it for impairment in accordance with ASC 350. This developed technology is also linked to certain internally developed software that was developed at Webzai after its acquisition by the Company which was also determined to be impaired. There were no impairment charges of intangible assets during the three and six months ended June 30, 2017 . At June 30, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,748 $ 128,654 $ 157,094 7 years Subscriber relationships 659,712 387,464 272,248 7 years Trade-names 133,804 64,807 68,997 8 years Intellectual property 34,278 11,990 22,288 13 years Domain names available for sale 30,258 5,895 24,363 Indefinite Leasehold interests 314 314 — 1 year Total June 30, 2017 $ 1,144,114 $ 599,124 $ 544,990 The estimated useful lives of the individual categories of other intangible assets are based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives is recognized over the period of time the assets are expected to contribute to future cash flows. The Company amortizes finite-lived intangible assets over the period in which the economic benefits are expected to be realized based upon their estimated projected cash flows. The Company’s amortization expense is included in cost of revenue in the aggregate amounts of $37.8 million and $34.9 million for the three months ended June 30, 2016 and 2017 , respectively. The Company’s amortization expense is included in cost of revenue in the aggregate amounts of $67.7 million and $69.2 million for the six months ended June 30 2016 and 2017 , respectively.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments As of December 31, 2016 and June 30, 2017 , the Company’s carrying value of investments in privately-held companies was $15.9 million and $15.8 million , respectively. In January 2012, the Company made an initial investment of $ 0.3 million to acquire a 25% interest in BlueZone Labs, LLC (“BlueZone”), a provider of “do-it-yourself” tools and managed search engine optimization services. The Company also has an agreement with BlueZone to purchase products and services. During the three months ended June 30, 2016 and 2017 , the Company purchased $ 0.5 million and $ 0.4 million , respectively, of products and services from BlueZone, which is included in cost of revenue in the Company’s consolidated statements of operations and comprehensive loss. As of December 31, 2016 and June 30, 2017 , $ 0.1 million and $ 0.2 million , respectively, relating to the Company’s investment in BlueZone was included in accounts payable and accrued expense in the Company’s consolidated balance sheet. As of December 31, 2016 and June 30, 2017 , $ 0.0 million and $ 0.9 million , respectively, relating to the Company’s investment in BlueZone was included in prepaid expenses in the Company’s consolidated balance sheet. In May 2014, the Company made a strategic investment of $ 15.0 million in Automattic, Inc. (“Automattic”), which provides content management systems associated with WordPress. The investment represents less than 5% of the outstanding shares of Automattic and better aligns the Company with an important partner. In August 2014, the Company made an aggregate investment of $ 3.9 million for a joint venture with a 49% ownership interest in WZ (UK) Ltd ("WZ UK"), which is a provider of technology, sales and marketing services associated with web builder solutions. On January 6, 2016, the Company exercised an option to increase its stake in WZ UK from 49% to 57.5% . Refer to Note 14 : Redeemable Non-controlling Interest , for further details. In December 2014, the Company made an aggregate investment of $ 15.2 million to acquire a 40% ownership interest in AppMachine B.V. (“AppMachine”), which is a developer of software that allows users to build mobile applications for smart devices such as phones and tablets. The Company acquired the remaining 60% of AppMachine on July 27, 2016. On March 3, 2016, the Company purchased a $ 0.6 million convertible promissory note from a business that provides web and mobile money management solutions, with the potential for subsequent purchases of additional convertible notes. On April 8, 2016, the Company made an investment of $ 5.0 million for a 33% equity interest in Fortifico Limited, a company providing a billing, CRM, and affiliate management solution to small and mid-sized businesses. During the year ended December 31, 2016, the Company incurred a charge of $4.7 million to impair the Company's 33% equity interest in Fortifico Limited, after determining that there were diminishing projected future cash flows on this investment. Investments in which the Company’s interest is less than 20% and which are not classified as available-for-sale securities are carried at the lower of cost or net realizable value unless it is determined that the Company exercises significant influence over the investee company, in which case the equity method of accounting is used. For those investments in which the Company’s voting interest is between 20% and 50% , the equity method of accounting is used. Under this method, the investment balance, originally recorded at cost, is adjusted to recognize the Company’s share of net earnings or losses of the investee company, as they occur, limited to the extent of the Company’s investment in, advances to and commitments for the investee. These adjustments are reflected in equity (income) loss of unconsolidated entities, net of tax in the Company’s consolidated statements of operations and comprehensive loss. The Company recognized net losses of $0.3 million and $0.0 million for the three months ended June 30, 2016 and 2017 , respectively. From time to time, the Company may make new and follow-on investments and may receive distributions from investee companies. As of June 30, 2017 , the Company was not obligated to fund any follow-on investments in these investee companies. As of June 30, 2017 , the Company did not have an equity method investment in which the Company’s proportionate share of the investees’ net income or loss exceeded 10% of the Company’s consolidated assets or income from continuing operations.

Notes Payable

Notes Payable	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Notes Payable	Notes Payable At December 31, 2016 and June 30, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: At December 31, 2016 At June 30, 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,642,321 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Notes 326,480 327,882 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,970,203 Current Portion of Notes Payable 35,700 33,945 Notes Payable - long term $ 1,951,280 $ 1,936,258 2017 First Lien Term Loan Facility In connection with the Company's June 14, 2017 refinancing of its then-outstanding term loans (the "2017 Refinancing"), the Company entered into its current first lien term loan facility (the "2017 First Lien") with an original balance of $1,697.3 million and a maturity date of February 9, 2023. As of December 31, 2016 and June 30, 2017 , the 2017 First Lien had an outstanding balance of: At June 30, 2017 (in thousands) 2017 First Lien Term Loan $ 1,688,764 Unamortized deferred financing costs (24,492 ) Unamortized original issue discount (21,951 ) Net 2017 First Lien Term Loan 1,642,321 Current portion of 2017 First Lien Term Loan (33,945 ) 2017 First Lien Term Loan - long term $ 1,608,376 The 2017 First Lien was issued at a price of 99.75% of par and automatically bears interest at the bank’s reference rate unless the Company gives notice to opt for LIBOR-based interest rate term loans. The interest rate for a LIBOR-based interest term loan is 4.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan is 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . The 2017 First Lien requires quarterly mandatory repayments of principal. During the six months ended June 30, 2017, the Company made one mandatory repayment of $8.5 million . Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate interest 2017 First Lien loan. 2013 First Lien Term Loan Facility The Company had a prior first lien term loan facility (the “2013 First Lien”) that originated in November 2013 with an original balance of $1,050.0 million and a maturity date of November 9, 2019. As of December 31, 2016 and June 30, 2017 , the 2013 First Lien had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ — The 2013 First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR based interest rate term loans. Prior to February 9, 2016, the interest rate for a LIBOR based interest term loan was 4.00% plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . The 2013 First Lien bore interest at a LIBOR-based rate of 5.00% during this period. In connection with the Company's February 9, 2016 acquisition of Constant Contact and the related financing of that transaction (the "Constant Contact Financing"), the applicable margin for a LIBOR based 2013 First Lien loan increased to 5.23% per annum starting on February 9, 2016 and to 5.48% per annum starting on February 28, 2016. The applicable margin on a reference rate 2013 First Lien loan increased to 4.23% per annum starting on February 9, 2016 and to 4.48% per annum starting on February 28, 2016. The 2013 First Lien required quarterly mandatory repayments of principal, and as a result of the Constant Contact Financing, the Company was obligated to use commercially reasonable efforts to make voluntary repayments on the 2013 First Lien to effectively double the amount of each scheduled amortization payment under this facility. During the six months ended June 30, 2017, the Company made mandatory repayments of $2.6 million and voluntary prepayments of $2.6 million against the 2013 First Lien prior to the 2017 Refinancing. Interest was payable on maturity of the elected interest period for a LIBOR-based 2013 First Lien loan, which could be one, two, three or six months. Interest was payable at the end of each fiscal quarter for a reference rate 2013 First Lien loan. As part of the 2017 Refinancing, the Company refinanced the then-outstanding 2013 First Lien balance of $980.6 million . Incremental First Lien Term Loan Facility In connection with the Constant Contact Financing, the Company entered into an incremental first lien term loan facility (the “Incremental First Lien”) with an original balance of $735.0 million and a maturity date of February 9, 2023. As of December 31, 2016 and June 30, 2017 , the Incremental First Lien had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issuance discount (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — The Incremental First Lien was issued at a price of 97.0% of par (subject to the payment of an additional upfront fee of 1.0% on February 28, 2016 ) and had scheduled principal payments equal to 0.50% of the original principal per quarter, or $3.7 million , starting September 30, 2016. The Incremental First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR-based interest rate term loans. Interest was payable on maturity of the elected interest period for a LIBOR-based interest loan, which could be one, two, three or six months. Interest was payable at the end of each fiscal quarter for a reference rate loan term loan. The interest rate for a LIBOR-based interest term loan was 5.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 4.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . During the six months ended June 30, 2017, the Company made $3.7 million in mandatory prepayments against the Incremental First Lien prior to the 2017 Refinancing. As part of the 2017 Refinancing, the Company refinanced the then-outstanding Incremental First Lien balance of $716.6 million . Revolving Credit Facility The Company had a revolving credit facility of $125.0 million (the “Prior Revolver”) that originated in November 2013 and had a maturity date of December 22, 2016. The Company could elect to draw down against the Prior Revolver using a LIBOR-rate interest loan or an alternate base rate interest loan. The interest rate for an alternate base rate revolver loan was 5.25% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.50% . The interest rate for a LIBOR based revolver loan was 6.25% per annum plus the greater of an adjusted LIBOR and 1.50% . There was also a non-refundable fee (the "commitment fee"), equal to 0.50% of the daily unused principal amount of the revolver payable in arrears on the last day of each fiscal quarter. In connection with the Constant Contact Financing, the Company entered into a new revolving credit facility (the “Current Revolver”), which increased the Company’s available revolving credit to $165.0 million and extended the maturity date to February 9, 2021. The Current Revolver had a "springing" maturity date of August 10, 2019, which is no longer applicable as a result of the 2017 Refinancing. As of December 31, 2016 and June 30, 2017, the Company did not have any balances outstanding under the Current Revolver, and the full amount of the facility, or $165.0 million , was unused and available. The Company has the ability to draw down against the Current Revolver using a LIBOR-based interest loan or an alternate based interest loan. LIBOR-based interest revolver loans bear interest at a rate of 4.0% per annum (subject to a leverage-based step-down) plus the greater of an adjusted LIBOR and 0% Alternate base interest revolver loans bear interest at 3.0% (subject to a leverage-based step down) plus the greatest of the prime rate, the federal funds rate plus 0.50% and an adjusted LIBOR or a one-month interest period plus 1.00% . There is also a non-refundable commitment fee, equal to 0.50% of the daily unused principal amount (subject to a leverage-based step down), which is payable in arrears on the last day of each fiscal quarter. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate revolver loan. Senior Notes In connection with the Constant Contact Financing, EIG Investors issued $350.0 million aggregate principal amount of senior notes (the "Notes") with a maturity date of February 1, 2024. The Notes were issued at a price of 98.065% of par and bear interest at the rate of 10.875% per annum. The Notes have been fully and unconditionally guaranteed, on a senior unsecured basis, by the Company and its subsidiaries that guarantee the 2017 First Lien and the Current Revolver (collectively with the Company's previously existing facilities, the "Senior Credit Facilities") (including Constant Contact and certain of its subsidiaries). As of December 31, 2016 and June 30, 2017 , the Notes had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (16,130 ) Unamortized original issuance discount (6,282 ) (5,988 ) Net Senior Notes 326,480 327,882 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 327,882 Interest on the Notes is payable twice a year, on August 1 and February 1. On January 30, 2017, the Company completed a registered exchange offer for the Notes, as required under the registration rights agreement it entered into with the initial purchasers of the Notes. All of the $350.0 million aggregate principal amount of the original notes was validly tendered for exchange as part of this exchange offer. Presentation of Debt Issuance Costs The Company adopted ASU 2015-03, “ Simplifying the Presentation of Debt Issuance Costs ” beginning on January 1, 2016, and retrospectively for all periods presented. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Unamortized balances of deferred financing costs and original issue discounts relating to the term loans and the Notes are presented as a reduction of the notes payable in the Company's consolidated balance sheets. The unamortized value of deferred financing costs associated with the Company's revolving credit facility were not affected by the ASU and continue to be presented as an asset on the Company’s consolidated balance sheets. Maturity of Notes Payable The maturity of the notes payable at June 30, 2017 is as follows: Amounts maturing in: (in thousands) (Remainder of) 2017 $ 16,973 2018 33,945 2019 33,945 2020 33,945 2021 33,945 Thereafter 1,886,011 Total $ 2,038,764 Interest The Company recorded $41.0 million and $45.7 million in interest expense for the three months ended June 30, 2016 and 2017 , respectively, and $71.4 million and $85.2 million , for the six months ended June 30, 2016 and 2017, respectively. The following table provides a summary of interest rates and interest expense for the three or six months ended June 30, 2016 and 2017 : Three Months Ended June 30, 2016 Three Months Ended June 30, 2017 Six Months Ended June 30, 2016 Six Months Ended June 30, 2017 (percentage per annum) Interest rate—LIBOR 6.00%-7.75% 5.14%-6.68% 6.00%-7.75% 5.14%-6.68% Interest rate—reference 7.50%-8.50% * 7.50%-8.50% * Interest rate—Senior Notes 10.875 % 10.875 % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % 0.50 % (dollars in thousands) Interest expense and service fees $ 37,512 $ 36,165 $ 65,508 $ 72,820 Loss on extinguishment of debt — 992 — 992 Deferred financing fees immediately expensed — 5,487 — 5,487 Amortization of deferred financing fees 1,651 1,786 2,562 3,530 Amortization of original issue discounts 823 886 1,272 1,732 Amortization of net present value of deferred consideration 799 187 1,582 377 Other interest expense 209 155 441 236 Total interest expense $ 40,994 $ 45,658 $ 71,365 $ 85,174 * The Company did not have debt bearing interest based on the reference rate for the three months and six months ended June 30, 2017. The Company concluded that the 2017 Refinancing was primarily a debt modification of the existing term loans in accordance with ASC 470-50, with extinguishment relating only to a few existing lenders that did not participate in the 2017 Refinancing. As a result, the Company capitalized $4.2 million of additional original issue discounts ("OID") and $0.9 million of deferred financing costs related to new lenders participating in the 2017 First Lien. These capitalized costs will be amortized over the remaining life of the loan using the effective interest method. Additionally, the Company recorded a charge during the three months ended June 30, 2017, included in interest expense, of $1.0 million to write off OID and deferred financing costs related to the refinanced debt for lenders not participating in the 2017 First Lien. Lastly, the Company recorded a charge of $5.5 million for the three months ended June 30, 2017, included in interest expense, for deferred financing costs incurred for the 2017 First Lien that related to existing lenders that carried over from the refinanced debt. Debt Covenants The Senior Credit Facilities require that the Company complies with a financial covenant to maintain a maximum ratio of consolidated senior secured net indebtedness to an adjusted consolidated EBITDA measure. Please see "Management's Discussion and Analysis" for further discussion of this covenant. The Senior Credit Facilities also contain covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge, sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. These covenants are subject to a number of important limitations and exceptions. Additionally, the Senior Credit Facilities require the Company to comply with certain negative covenants and specify certain events of default that could result in amounts becoming payable, in whole or in part, prior to their maturity dates. With the exception of certain equity interests and other excluded assets under the terms of the Senior Credit Facilities, substantially all of the Company's assets are pledged as collateral for the obligations under the Senior Credit Facilities. The indenture with respect to the Notes contains covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. Upon a change of control as defined in the indenture, the Company must offer to repurchase the Notes at 101% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, up to, but not including, the repurchase date. These covenants are subject to a number of important limitations and exceptions. The indenture also provides for events of default, which, if any of them occurs, may permit or, in certain circumstances, require the principal, premium, if any, interest and any other monetary obligations on all the then outstanding Notes to be due and payable immediately. The Company was in compliance with all covenants at June 30, 2017.

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Voting Rights All holders of common stock are entitled to one vote per share. The following table presents the changes in total stockholders’ equity: Total Stockholders’ Equity (in thousands) Balance at December 31, 2016 $ 124,383 Stock-based compensation 28,357 Reclassification of stock-compensation liability award 450 Stock option exercises 1,132 Foreign currency translation adjustment 1,914 Unrealized loss on derivative (392 ) Net loss attributable to non-controlling interest 277 Net loss attributable to Endurance International Group (74,517 ) Balance at June 30, 2017 $ 81,604

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation 2013 Stock Incentive Plan The Amended and Restated 2013 Stock Incentive Plan (the “2013 Plan”) of the Company became effective upon the closing of its Initial Public Offering ("IPO"). The 2013 Plan provides for the grant of options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards to employees, officers, directors, consultants and advisors of the Company. Under the 2013 Plan, the Company may issue up to 38,000,000 shares of the Company’s common stock. At June 30, 2017 , there were 14,728,500 shares available for grant under the 2013 Plan. 2011 Stock Incentive Plan As of February 9, 2016, the effective date of the acquisition of Constant Contact, the Company assumed and converted certain outstanding equity awards granted by Constant Contact under the Constant Contact 2011 Stock Incentive Plan (“2011 Plan”) prior to the effective date of the acquisition (the “Assumed Awards”) into corresponding equity awards with respect to shares of the Company’s common stock. In addition, the Company assumed certain shares of Constant Contact common stock, par value $0.01 per share, available for issuance under the 2011 Plan (the “Available Shares”), which will be available for future issuance under the 2011 Plan in satisfaction of the vesting, exercise or other settlement of options and other equity awards that may be granted by the Company following the effective date of the acquisition of Constant Contact in reliance on the prior approval of the 2011 Plan by the stockholders of Constant Contact. The Assumed Awards were converted into 2,143,987 stock options and 2,202,846 restricted stock units with respect to the Company’s common stock and the Available Shares were converted into 10,000,000 shares of the Company’s common stock reserved for future awards under the 2011 Plan. At June 30, 2017 , there were 8,859,580 shares available for grant under the 2011 Plan. The Company calculated the fair value of the exchanged awards in accordance with the provisions of ASC 718 as of the acquisition date. The Company allocated the fair value of these awards between the pre-acquisition and post-acquisition stock-based compensation expense. The Company determined that the value of the awards under this plan was $22.3 million , of which $5.4 million was attributed to the pre-acquisition period and recognized as part of the purchase consideration for Constant Contact. The balance of $16.9 million has been attributed to the post-acquisition period, and will be recognized in the Company’s consolidated statements of operations and comprehensive loss over the vesting period of the awards. The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) Cost of revenue $ 1,703 $ 1,661 $ 2,473 $ 3,167 Sales and marketing 2,677 2,911 4,399 4,764 Engineering and development 1,441 1,728 2,205 2,899 General and administrative 9,203 9,945 24,335 18,339 Total stock-based compensation expense $ 15,024 $ 16,245 $ 33,412 $ 29,169 2013 Stock Incentive Plan The following table provides a summary of the Company’s stock options as of June 30, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the six months ended June 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 110,433 $ 8.15 Exercised — $ — Forfeited (179,758 ) $ 13.24 Expired (209,074 ) $ 13.68 Outstanding at June 30, 2017 9,329,032 $ 12.71 7.4 $ 63 Exercisable at June 30, 2017 5,875,021 $ 12.90 6.8 $ — Expected to vest after June 30, 2017 (1) 3,454,011 $ 12.38 8.2 $ — Exercisable as of June 30, 2017 and expected to vest (2) 9,329,032 $ 12.71 7.4 $ 63 (1) This represents the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of June 30, 2017 plus the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on June 30, 2017 of $8.35 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. Restricted stock units granted under the 2013 Plan generally vest monthly over a four -year period, unless otherwise determined by the Company’s board of directors. The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the six months ended June 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Granted 2,496,646 $ 7.84 Vested and unissued (188,511 ) $ 7.85 Cancelled (45,464 ) $ 7.85 Non-vested at June 30, 2017 2,363,040 $ 7.91 Restricted stock awards granted under the 2013 Plan generally vest annually over a four -year period, unless otherwise determined by the Company’s board of directors. Performance-based restricted stock awards are earned based on the achievement of performance criteria established by the Company’s compensation committee and board of directors. The following table provides a summary of the Company’s restricted stock award activity for the 2013 Plan during the six months ended June 30, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (1,867,736 ) $ 10.58 Canceled (87,421 ) $ 12.78 Non-vested at June 30, 2017 5,537,808 $ 13.95 2015 Performance Based Award The performance-based restricted stock award granted to the Company’s chief executive officer ("CEO") Hari Ravichandran during 2015 provides an opportunity for the participant to earn a fully vested right to up to 3,693,754 shares of the Company’s common stock (the “Award Shares”) over a three -year period beginning July 1, 2015 and ending on June 30, 2018 (the “Performance Period”). Award Shares may be earned based on the Company achieving pre-established, threshold, target and maximum performance metrics. Award Shares may be earned during each calendar quarter during the Performance Period (each, a “Performance Quarter”) if the Company achieves a threshold, target or maximum level of the performance metric for the Performance Quarter. If the performance metric is less than the threshold level for a Performance Quarter, no Award Shares will be earned during the Performance Quarter. Award Shares that were not earned during a Performance Quarter may be earned later during the then current twelve-month period from July 1st to June 30th during the Performance Period (each, a “Performance Year”), at a threshold, target or maximum level of the performance metric for the Performance Year. For the second quarter of 2017, 154,146 Award Shares were earned for the Performance Quarter ending June 30, 2017 because a performance level between the threshold and target for the quarterly performance metric was met, and no additional shares were earned for the Performance Year ending June 30, 2017 because the threshold level for the annual performance metric was not met. Any Award Shares that are earned during the Performance Period will vest on June 30, 2018, provided the chief executive officer is employed by the Company on such date. The requirement that the chief executive officer be employed by the Company on June 30, 2018 is waived in the event the executive’s employment is terminated due to death, disability or by the Company without cause, if the executive terminates employment with the Company for good reason, or if the executive is employed by the Company on the date of a change in control (as such terms are defined in the executive’s employment agreement). Upon the occurrence of any of the foregoing events, additional Award Shares may be earned, as provided for in the performance-based restricted stock agreement. This performance-based award is evaluated quarterly to determine the probability of its vesting and determine the amount of stock-based compensation to be recognized. During the three and six months ended June 30, 2017 , the Company recognized $3.5 million and $5.6 million , respectively, of stock-based compensation expense related to this performance-based award. In April 2017, the Company announced that its board of directors and its CEO adopted a CEO transition plan whereby Mr. Ravichandran will remain CEO and serve as a board member while the Company conducts a search to identify his successor. Depending on the timing of identifying a successor, the CEO transition plan may affect the outstanding awards held by Mr. Ravichandran. In accordance with the terms of the 2015 Performance Based Award, upon separation Mr. Ravichandran will receive the Award Shares earned with respect to Performance Quarters completed prior to the separation, plus the greater of (a) the target number of Award Shares eligible to be earned in the Performance Quarter in which the separation occurs and (b) the number of Award Shares that would have been earned in the Performance Quarter in which the separation occurs as if Mr. Ravichandran had remained employed through the end of the Performance Quarter. In addition, it is expected that the attribution period used to estimate the stock compensation cost associated with the 2015 Performance Based Award will shorten. The Company is currently using an attribution period of 2.75 years for that purpose. 2016 Performance Based Awards On February 16, 2016, the compensation committee of the board of directors of the Company approved the grant of performance-based restricted stock awards to the Company’s chief financial officer (“CFO”), chief operating officer (“COO”) and chief administrative officer (“CAO”). Based on the Company's achievement of Constant Contact revenue, adjusted EBITDA and cash flow metrics, these shares vested on March 31, 2017 and each executive earned the maximum number of shares subject to his or her award. The CFO earned 223,214 shares of the Company’s stock, the COO earned 260,416 shares of the Company’s stock, and the CAO earned 148,810 shares of the Company’s stock. These earned shares vested on March 31, 2017. These performance-based awards were evaluated quarterly to determine the probability of vesting and determine the amount of stock-based compensation to be recognized. During the three and six months ended June 30, 2017 , the Company recognized $0.0 million and $1.2 million , respectively, of stock-based compensation expense related to these performance-based awards. 2011 Stock Incentive Plan The following table provides a summary of the Company’s stock options as of June 30, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the six months ended June 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted/ Exchanged 14,724 $ 8.15 Exercised (196,167 ) $ 5.77 Forfeited (333,361 ) $ 9.99 Expired (17,097 ) $ 8.69 Outstanding at June 30, 2017 1,399,929 $ 8.83 4.5 $ 1,087 Exercisable at June 30, 2017 697,592 $ 8.31 3.6 $ 823 Expected to vest after June 30, 2017 (1) 702,337 $ 9.35 5.4 $ 264 Exercisable as of June, 2017 and expected to vest (2) 1,399,929 $ 8.83 4.5 $ 1,087 (1) This represents the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of June 30, 2017 plus the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on June 30, 2017 of $8.35 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. Unless otherwise determined by the Company’s board of directors, restricted stock units granted under the 2011 Plan generally vest annually over a four -year period. The following table provides a summary of the Company’s restricted stock unit activity for the 2011 Plan during the six months ended June 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 1,114,191 $ 7.85 Vested (536,126 ) $ 7.30 Canceled (350,377 ) $ 8.94 Non-vested at June 30, 2017 1,701,343 $ 8.21

Accumulated Other Comprensive I

Accumulated Other Comprensive Income	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents the components of accumulated other comprehensive loss (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2016 $ (2,395 ) $ (1,271 ) $ (3,666 ) Other comprehensive income (loss) 1,914 (392 ) 1,522 Balance at June 30, 2017 $ (481 ) $ (1,663 ) $ (2,144 )

Variable Interest Entity

Variable Interest Entity	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	Variable Interest Entity The Company, through a subsidiary formed in China, has entered into various agreements with Shanghai Xiao Lan Network Technology Co., Ltd (“Shanghai Xiao”) and its shareholders that allow the Company to effectively control Shanghai Xiao, making it a variable interest entity (“VIE”). Shanghai Xiao has a technology license that allows it to provide local hosting services to customers located in China. The shareholders of Shanghai Xiao cannot transfer their equity interests without the approval of the Company, and as a result, are considered de facto agents of the Company in accordance with ASC 810-10-25-43. The Company and its de facto agents acting together have the power to direct the activities that most significantly impact the entity’s economic performance and they have the obligation to absorb losses and the right to receive benefits from the entity. In situations where a de facto agency relationship is present, one party is required to be identified as the primary beneficiary. The factors considered include the presence of a principal/agent relationship, the relationship and significance of activities to the reporting entity, the variability associated with the VIE’s anticipated economics and the design of the VIE. The analysis is qualitative in nature and is based on weighting the relative importance on each of the factors in relation to the specifics of the VIE arrangement. Upon the execution of the agreements with Shanghai Xiao and its shareholders, the Company performed an analysis and concluded that the Company is the party that is most closely associated with Shanghai Xiao, as it is the most exposed to the variability of the VIE’s economics and therefore is the primary beneficiary of the VIE. As of June 30, 2017 , the financial position and results of operations of Shanghai Xiao are consolidated within, but are not material to, the Company’s consolidated financial position or results of operations.

Redeemable Non-controlling Inte

Redeemable Non-controlling Interest	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Redeemable Non-controlling Interest	Redeemable Non-controlling Interest In connection with a 2014 equity investment in WZ UK, on January 6, 2016, the Company exercised its option to increase its stake in WZ UK from 49% to 57.5% , thereby acquiring a controlling interest, in exchange for a payment of approximately $2.1 million to the other shareholders of WZ UK. The agreement related to the transaction provides for a put option for the then NCI shareholders to put the remaining equity interest to the Company within pre-specified put periods. As the NCI is subject to a put option that is outside the control of the Company, it is deemed a redeemable non-controlling interest and is not recorded in permanent equity, and is presented as mezzanine redeemable non-controlling interest on the consolidated balance sheet, and is subject to the guidance of the Securities and Exchange Commission (“SEC”) under ASC 480-10-S99, Accounting for Redeemable Equity Securities. The difference between the $10.8 million fair value of the redeemable NCI and the $30.0 million value that is expected to be paid upon exercise of the put option was being accreted over the period commencing January 6, 2016 and up to the first put option period, which commenced on the 24 -month anniversary of the acquisition date, August 14, 2016. Adjustments to the carrying amount of the redeemable non-controlling interest were charged to additional paid-in capital. In January 2016, the Company obtained a controlling interest in Resume Labs Limited for $1.5 million and Pseudio Limited for $1.5 million . The agreements related to these transactions provided for put options for the NCI shareholders of each company to put the remaining equity interest to the Company within pre-specified put periods. As the NCI for these entities were subject to put options that were outside the control of the Company, they are deemed redeemable non-controlling interests and were also not recorded in permanent equity, and were presented as part of the mezzanine redeemable non-controlling interest on the consolidated balance sheet. On May 16, 2016, the Company amended the put option with respect to WZ UK to allow it to acquire an additional equity interest in WZ UK earlier than August 2016. Pursuant to this amended option, on the same date the Company acquired an additional 20% stake in WZ UK for $15.4 million , thus increasing its ownership interest from 57.5% to 77.5% . On July 13, 2016, WZ UK completed a restructuring pursuant to which Pseudio Limited and Resume Labs became wholly-owned subsidiaries of WZ UK. As a result of the restructuring, WZ UK became the 100% owner of Pseudio Limited and Resume Labs Limited. Immediately subsequent to the restructuring, the Company acquired additional equity in WZ UK for $18.0 million , bringing the Company’s aggregate stake in WZ UK to 86.4% . The restructuring significantly reduced the amount of the potential redemption amount payable to the minority shareholders of WZ UK, and gave the Company the flexibility to reduce investments in this business. Based on these reduced investments, the estimated value of the non-controlling interest is below the expected redemption amount of $25.0 million , which will result in $14.2 million of excess accretion that will reduce income available to common shareholders for the period starting on the date of the restructuring through the redemption date of July 1, 2017. The Company recognized excess accretion of $3.7 million and $7.2 million for the three and six months ended June 30, 2017 , respectively, which is reflected in net loss attributable to accretion of non-controlling interest in the Company’s consolidated statements of operations and comprehensive loss. Prior to the third quarter of 2016, the Company did not have any accretion amounts in excess of fair value. On July 7, 2017, the Company redeemed the remaining redeemable non-controlling interest for $25.0 million . See Note 20: Subsequent Events . The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling Interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Balance as of June 30, 2017 $ 25,000 The Company starts accreting non-controlling interest to its redeemable value from the date the redemption of the non-controlling interest becomes probable through the earliest redemption date. If the non-controlling interest is redeemable at an amount higher than its fair value, the excess accretion is taken into consideration in the calculation of loss per share.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company files income tax returns in the United States for federal income taxes and in various state jurisdictions. The Company also files in several foreign jurisdictions. In the normal course of business, the Company is subject to examination by tax authorities throughout the world. Since the Company is in a loss carry-forward position, it is generally subject to U.S. federal and state income tax examinations by tax authorities for all years for which a loss carry-forward is utilized. The Company is currently under audit in India for fiscal years ended March 31, 2014, 2015 and 2016 and Israel for the fiscal years ended December 31, 2012, 2013, 2014 and 2015. The statutes of limitations in the Company’s other tax jurisdictions, United Kingdom, Netherlands and Brazil, remain open for various periods between 2012 and the present. However, carryforward attributes from prior years may still be adjusted upon examination by tax authorities if they are used in an open period. The Company does not expect material changes as a result of the India and Israel audits. The Company recognizes, in its consolidated financial statements, the effect of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. The Company has no unrecognized tax positions at December 31, 2016 and June 30, 2017 that would affect its effective tax rate. The Company does not expect a significant change in the liability for unrecognized tax benefits in the next 12 months. The Company regularly assesses its ability to realize its deferred tax assets. Assessing the realization of deferred tax assets requires significant management judgment. In determining whether its deferred tax assets are more likely than not realizable, the Company evaluated all available positive and negative evidence, and weighted the evidence based on its objectivity. Evidence the Company considered included: • Net Operating Losses (“NOL”) incurred from the Company’s inception to June 30, 2017 ; • Expiration of various federal, state and foreign tax attributes; • Reversals of existing temporary differences; • Composition and cumulative amounts of existing temporary differences; and • Forecasted profit before tax. Prior to the February 2016 acquisition of Constant Contact, the Company maintained a valuation allowance against certain deferred tax assets. The acquisition of Constant Contacted resulted in a significant increase in deferred tax liabilities, which far exceeded pre-acquisition deferred tax assets. The Company, with the significant deferred tax liabilities resulting from Constant Contact acquisition, scheduled out the reversal of the consolidated US deferred tax assets and liabilities, and determined that these reversals would be sufficient to realize a significant portion of deferred tax assets that existed at the date of acquisition, and provided a valuation allowance against those deferred tax assets that were not likely to be realized. The deferred tax liabilities supporting the realizability of these deferred tax assets in the acquisition will reverse in the same period, are in the same jurisdiction and are of the same character as the temporary differences that gave rise to these deferred tax assets. After completing the scheduling analysis, the Company determined that it should maintain valuation allowances on several of the legacy state net operating loss carryforwards expected to expire unused. The reversal of valuation allowances following this scheduling analysis resulted in the recording of a tax benefit of $73.6 million during the quarter ended March 31, 2016. For the year ended December 31, 2016, the Company updated the scheduling of the reversal of the consolidated US deferred tax assets and liabilities. Following the acquisition, deferred tax liabilities have decreased and the Company generated additional pre-tax losses. As of December 31, 2016, the scheduling of the reversal of the consolidated US deferred tax assets and liabilities generated sufficient income to utilize US deferred tax assets with the exception of certain Federal credits and state net operating loss and credit carryforwards. Accordingly, the Company increased its valuation allowance by $10.0 million during the last three quarters of fiscal year 2016. The Company updated the scheduling of the reversal of the consolidated US deferred tax assets and liabilities for the period ended June 30, 2017, as the deferred tax liabilities have continued to decrease and the Company generated additional pre-tax losses. As of June 30, 2017, the Company has determined that the reversal of temporary differences will no longer generate sufficient income to utilize certain of its consolidated deferred tax assets in the US. Accordingly, the Company recorded an increase of $14.4 million to its valuation allowance during the quarter ended June 30, 2017, mostly related to the different book and tax treatment of goodwill. For the three months ended June 30, 2016 and 2017 , the Company recognized tax benefit of $13.9 million and a tax expense of $2.6 million , respectively, in the consolidated statements of operations and comprehensive loss. The income tax expense for the three months ended June 30, 2017 was primarily attributable to a federal and state deferred tax expense of $1.7 million due primarily to the different book and tax treatment of goodwill, federal and state current income taxes of $0.9 million , a foreign current tax expense of $0.8 million , offset by a foreign deferred tax benefit of $0.8 million . The income tax benefit for the three months ended June 30, 2016 was primarily attributable to a $0.9 million reversal of the valuation allowance, a federal and state deferred tax benefit of $11.6 million , a foreign deferred tax benefit of $1.5 million , and a benefit for federal and state current income taxes of $0.6 million , partially offset by a foreign current tax expense of $0.7 million . For the six months ended June 30, 2016 and 2017, the Company recognized tax benefit of $113.8 million and a tax expense of $8.4 million , respectively, in the consolidated statements of operations and comprehensive loss. The income tax expense for the six months ended June 30, 2017 was primarily attributable to a federal and state deferred tax expense of $5.3 million related to the differences in accounting treatment of goodwill under U.S. GAAP and tax accounting for goodwill, federal and state current income taxes of $2.4 million , a foreign current tax expense of $1.7 million , offset by a foreign deferred tax benefit of $1.0 million . The income tax benefit for the six months ended June 30, 2016 was primarily attributable to a $74.4 million reversal of the valuation allowance, a federal and state deferred tax benefit of $40.6 million , which includes the identification and recognition of $7.3 million of U.S. federal research and development credits, and a foreign deferred tax benefit of $2.2 million , partially offset by a provision for federal and state current income taxes of $1.5 million and foreign current tax expense of $1.8 million . The provision for income taxes shown on the consolidated statements of operations and comprehensive loss differs from amounts that would result from applying the statutory tax rates to income before taxes primarily because of the application of valuation allowances against U.S. and foreign assets, as well as state income taxes and certain expenses that were non-deductible. As of December 31, 2016 , the Company had NOL carry-forwards available to offset future U.S. federal taxable income of approximately $142.7 million and future state taxable income of approximately $125.6 million . These NOL carry-forwards expire on various dates through 2036 . As of December 31, 2016, the Company had NOL carry-forwards in foreign jurisdictions available to offset future foreign taxable income by approximately $96.8 million . The Company has loss carry-forwards that begin to expire in 2021 in India totaling $2.5 million and in China totaling $0.3 million . The Company has loss carry-forwards that begin to expire in 2020 in the Netherlands totaling $10.7 million . The Company also has loss carry-forwards in the United Kingdom, Israel and Singapore of $81.1 million , $1.9 million , and $0.3 million , respectively, which have an indefinite carry-forward period. In addition, the Company has $3.4 million of U.S. federal capital loss carry-forwards and $1.4 million in state capital loss-forwards, generally expiring through 2021. As of December 31, 2016, the Company had U.S. tax credit carryforwards available to offset future U.S. federal and state taxes of approximately $20.3 million and $12.2 million , respectively. These credit carryforwards expire on various dates through 2036. Utilization of the NOL carry-forwards may be subject to an annual limitation due to the ownership percentage change limitations under Section 382 of the Internal Revenue Code (“Section 382 limitation”). Ownership changes can limit the amount of net operating loss and other tax attributes that a company can use each year to offset future taxable income and taxes payable. In connection with a change in control in 2011 the Company was subject to Section 382 limitations of $77.1 million against the balance of NOL carry-forwards generated prior to the change in control in 2011. Through December 31, 2014 , the Company accumulated the unused amount of Section 382 limitations in excess of the amount of NOL carry-forwards that were originally subject to limitation. Therefore, these unused NOL carry-forwards are available for future use to offset taxable income. The Company has completed an analysis of changes in its ownership from 2011, through its IPO, to December 31, 2014 . The Company concluded that there was not a Section 382 ownership change during this period and therefore any NOLs generated through December 31, 2014 , are not subject to any new Section 382 limitations on NOL carry-forwards. On November 20, 2014, the Company completed a follow-on offering of 13,000,000 shares of common stock. The underwriters also exercised their overallotment option to purchase an additional 1,950,000 shares of common stock from the selling stockholders. The Company performed an analysis of the impact of this offering and determined that no Section 382 change in ownership had occurred. On March 11, 2015, the Company completed a follow-on offering of its common stock, in which selling stockholders sold 12,000,000 shares of common stock at a public offering price of $19.00 per share. The underwriter also exercised its overallotment option to purchase an additional 1,800,000 shares of common stock from the selling stockholders. The Company completed an analysis of its ownership changes in the first half of 2016, which resulted in no ownership-change for tax purposes within the meaning of the Internal Revenue Code Section 382(g).

Severance and Other Exit Costs

Severance and Other Exit Costs	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Severance and Other Exit Costs	Severance and Other Exit Costs In connection with acquisitions, the Company may evaluate its data center, sales and marketing, support and engineering operations and the general and administrative function in an effort to eliminate redundant costs. As a result, the Company may incur charges for employee severance, exiting facilities and restructuring data center commitments and other related costs. 2017 Restructuring Plan In January 2017, the Company announced plans to close certain offices as part of a plan to consolidate certain web presence customer support operations, resulting in severance costs (the “2017 Restructuring Plan”). These severance charges were associated with eliminating approximately 660 positions, primarily in customer support. Additionally, the Company implemented additional restructuring plans to create operational efficiencies and synergies related to the Constant Contact acquisition, which resulted in additional severance charges for the elimination of approximately 50 positions. In connection with these plans, the Company incurred severance costs of $4.4 million and $8.9 million , and paid $3.0 million and $3.7 million , during the three and six months ended June 30, 2017 , respectively. The Company had a remaining accrued severance liability of $5.2 million as of June 30, 2017 . In connection with the 2017 Restructuring Plan, the Company closed offices in Orem, Utah and relocated certain employees to our Tempe, Arizona office. During the three and six months ended June 30, 2017 , the Company incurred facility charges of $0.6 million and $0.6 million , respectively. The Company made immaterial payments during the three and six months ended June 30, 2017 , and had a remaining accrued facility liability of $0.6 million as of June 30, 2017 . The Company expects to incur severance charges through December 31, 2017 regarding this plan, and expects severance payments related to this plan to be completed during the year ended December 31, 2018. 2016 Restructuring Plan In connection with the Company’s acquisition of Constant Contact on February 9, 2016, the Company implemented a plan to create operational efficiencies and synergies resulting in severance costs and facility exit costs (the “2016 Restructuring Plan”). The severance charges were associated with eliminating approximately 265 positions across the business. The Company did not incur additional severance costs during the three and six months ended June 30, 2017 . The Company paid $0.4 million and $1.4 million of severance costs during the three and six months ended June 30, 2017 , respectively, and had a remaining accrued severance liability of $0.2 million as of June 30, 2017 . The Company’s 2016 Restructuring Plan included a plan to close offices in San Francisco, California, Delray Beach, Florida, New York, New York, Miami, Florida, the United Kingdom and Brazil, and a plan to relocate certain employees to our Austin, Texas office. The Company also closed a portion of the Constant Contact offices in Waltham, Massachusetts. During the three and six months ended June 30, 2017 , the Company recorded an adjustment to the Waltham facilities charge for future lease payments of $(0.6) million and $0.5 million , respectively, due to a change in estimated sublease income. The Company paid $1.2 million and $2.4 million of facility costs related to the 2016 Restructuring Plan during the three and six months ended June 30, 2017 , respectively, and had a remaining accrued facility liability of $6.8 million as of June 30, 2017 . The Company incurred all employee-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016, and expects severance payments related to the 2016 Restructuring Plan to be completed during the year ended December 31, 2017. Other than the adjustment mentioned above, the Company completed facility-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016, and expects to complete facility exit cost payments related to the plan during the year ended December 31, 2022. Activity of Combined Restructuring Plans The following table provides a summary of the aggregate activity for the six months ended June 30, 2017 related to the Company’s combined Restructuring Plans severance accrual: Employee Severance (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 633 $ 926 $ 1,559 Severance charges 5,340 3,686 9,026 Cash paid (2,765 ) (2,463 ) (5,228 ) Balance at June 30, 2017 $ 3,208 $ 2,149 $ 5,357 The following table provides a summary of the aggregate activity for the six months ended June 30, 2017 related to the Company’s combined Restructuring Plans facilities exit accrual: Facilities (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 273 $ 8,747 $ 9,020 Facility adjustments 573 498 1,071 Sublease income received 352 — 352 Cash paid (451 ) (2,404 ) (2,855 ) Balance at June 30, 2017 $ 747 $ 6,841 $ 7,588 The following table presents restructuring charges recorded in the consolidated statements of operations and comprehensive loss for the periods presented: For the Three Months Ended June 30, For the Six Months Ended June 30, 2016 2017 2016 2017 (in thousands) Cost of revenue $ 2,137 $ 700 $ 5,602 $ 3,443 Sales and marketing 1,267 875 5,168 2,249 Engineering and development 1,224 426 3,242 1,078 General and administrative 1,035 2,467 3,253 3,325 Total restructuring charges $ 5,663 $ 4,468 $ 17,265 $ 10,095

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies From time to time, the Company is involved in legal proceedings or subject to claims arising in the ordinary course of its business. The Company is not presently involved in any such legal proceeding or subject to any such claim that, in the opinion of its management would have a material adverse effect on its business, operating results or financial condition. However, the results of such legal proceedings or claims cannot be predicted with certainty, and regardless of the outcome, can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. Neither the ultimate outcome of the matters listed below nor an estimate of any probable losses or any reasonably possible losses can be assessed at this time. The Company received a subpoena dated December 10, 2015 from the Boston Regional Office of the SEC, requiring the production of certain documents, including, among other things, documents related to its financial reporting, including operating and non-GAAP metrics, refund, sales and marketing practices and transactions with related parties. The Company is fully cooperating with the SEC’s investigation. The Company can make no assurances as to the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on the Company’s business, financial condition, results of operations and cash flows. On May 4, 2015, Christopher Machado, a purported holder of the Company’s common stock, filed a civil action in the United States District Court for the District of Massachusetts against the Company and its chief executive officer and former chief financial officer, captioned Machado v. Endurance International Group Holdings, Inc., et al., Civil Action No. 1:15-cv-11775-GAO. The plaintiff filed an amended complaint on December 8, 2015, and a second amended complaint on March 18, 2016. The Company moved to dismiss the second amended complaint, but before the court ruled on the Company's motion, with the Company's assent, the plaintiff filed a third amended complaint on June 30, 2017. In the third amended complaint, plaintiffs Christopher Machado and Michael Rubin allege claims for violations of Section 10(b) and 20(a) of the Exchange Act, and Sections 11, 12(a)(2), and 15 of the Securities Act, on behalf of a purported class of purchasers of the Company’s securities between October 25, 2013 and December 16, 2015, including persons or entities who purchased or acquired the Company's shares pursuant or traceable to the registration statement and prospectus issued in connection with the Company's October 25, 2013 initial public offering. The plaintiffs challenge as false or misleading certain of the Company’s disclosures about the total number of subscribers, average revenue per subscriber, the number of customers paying over $500 per year for the Company’s products and services, and the average number of products sold per subscriber. The plaintiffs seek, on behalf of themselves and the purported class, compensatory damages, rescissory damages as to class members who purchased shares pursuant to the offering and the plaintiffs' costs and expenses of litigation. The Company has until August 29, 2017 to respond to the third amended complaint. The Company and the individual defendants intend to deny any liability or wrongdoing and to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of the proceeding. Constant Contact On February 9, 2016, the Company acquired all of the outstanding shares of common stock of Constant Contact. On December 10, 2015, Constant Contact received a subpoena from the Boston Regional Office of the SEC, requiring the production of documents pertaining to Constant Contact’s sales, marketing, and customer retention practices, as well as periodic public disclosure of financial and operating metrics. The Company is fully cooperating with the SEC’s investigation. The Company can make no assurances as to the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on the Company’s business, financial condition, results of operations and cash flows. On August 7, 2015, a purported class action lawsuit, William McGee v. Constant Contact, Inc., et al, was filed in the United States District Court for the District of Massachusetts against Constant Contact and two of its former officers. An amended complaint, which named an additional former officer as a defendant, was filed December 19, 2016. The lawsuit asserts claims under Sections 10(b) and 20(a) of the Exchange Act, and is premised on allegedly false and/or misleading statements, and non-disclosure of material facts, regarding Constant Contact’s business, operations, prospects and performance during the proposed class period of October 23, 2014 to July 23, 2015. This litigation remains in its early stages. The Company and the individual defendants intend to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of this proceeding. In August 2012, RPost Holdings, Inc., RPost Communications Limited and RMail Limited, or collectively, RPost, filed a complaint in the United States District Court for the Eastern District of Texas that named Constant Contact as a defendant in a lawsuit. The complaint alleged that certain elements of Constant Contact’s email marketing technology infringe five patents held by RPost. RPost seeks an award for damages in an unspecified amount and injunctive relief. In February 2013, RPost amended its complaint to name five of Constant Contact’s marketing partners as defendants. Under Constant Contact’s contractual agreements with these marketing partners, it is obligated to indemnify them for claims related to patent infringement. Constant Contact filed a motion to sever and stay the claims against its partners and multiple motions to dismiss the claims against it. In January 2014, the case was stayed pending the resolution of certain state court and bankruptcy actions involving RPost, to which Constant Contact is not a party. The case continues to be stayed pending the state court and bankruptcy actions. Meanwhile, RPost asserted the same patents asserted against Constant Contact in litigation against Go Daddy. In June 2016, Go Daddy succeeded in invalidating all of those RPost patents. On July 7, 2016, RPost appealed the District Court order to the United States Court of Appeal for the Federal Circuit. On November 14, 2016, Endurance filed an amicus brief in the Federal Circuit in support of GoDaddy’s position. The case was argued on May 3, 2017, and the Federal Circuit issued an order without opinion affirming the district court’s decision that the RPost patents are invalid. On June 5, 2017, RPost filed a Combined Petition for Panel Rehearing and Rehearing En Banc. On July 6, 2017, the Federal Circuit invited GoDaddy to respond to RPost’s Petition. GoDaddy has not yet responded. Should RPost’s Petition be denied, all claims asserted by RPost against Constant Contact in December 2012 will remain invalid except for one claim from one patent. Constant Contact has notified RPost that it believes the remaining claim is invalid in light of the other litigation that RPost lost. RPost has not yet indicated what its position will be as to the remaining claim if its Federal Circuit Petition is denied. On December 11, 2015, a putative class action lawsuit relating to the Constant Contact acquisition, captioned Irfan Chawdry, Individually and On Behalf of All Others Similarly Situated v. Gail Goodman, et al. Case No. 11797, and on December 21, 2015, a putative class action lawsuit relating to the acquisition captioned David V. Myers, Individually and On Behalf of All Others Similarly Situated v. Gail Goodman, et al. Case No. 11828 (together, the “Complaints”) were filed in the Court of Chancery of the State of Delaware, naming Constant Contact, each of Constant Contact’s directors, Endurance and Paintbrush Acquisition Corporation as defendants. The Complaints generally alleged, among other things, that in connection with the acquisition the directors of Constant Contact breached their fiduciary duties owed to the stockholders of Constant Contact by agreeing to sell Constant Contact for purportedly inadequate consideration, engaging in a flawed sales process, omitting material information necessary for stockholders to make an informed vote, and agreeing to a number of purportedly preclusive deal protection devices. The Complaints sought, among other things, to rescind the acquisition, as well as an award of plaintiffs’ attorneys’ fees and costs in the action. The Complaints were consolidated on January 12, 2016. On December 5, 2016, plaintiff Myers filed a consolidated amended complaint (the “Amended Complaint”), naming as defendants the former Constant Contact directors and Morgan Stanley & Co. LLC (“Morgan Stanley”), Constant Contact’s financial advisor for the acquisition. The Amended Complaint generally alleges breach of fiduciary duty by the former directors, and aiding and abetting the alleged breach by Morgan Stanley. The Constant Contact defendants filed a motion to dismiss the Amended Complaint on December 15, 2016 and an opening brief in support of the motion to dismiss on March 17, 2017. Plaintiff Myers filed an opposition brief to the motion to dismiss on May 17, 2017, and the Constant Contact defendants’ reply brief was filed on June 19, 2017. Oral argument has not yet been scheduled. The defendants believe the claims asserted in the Amended Complaint are without merit and intend to defend against them vigorously.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has various agreements in place with related parties. Below are details of related party transactions that occurred during the six months ended June 30, 2016 and 2017 . Tregaron: The Company has contracts with Tregaron India Holdings, LLC and its affiliates, including Diya Systems (Mangalore) Private Limited, Glowtouch Technologies Pvt. Ltd. and Touchweb Designs, LLC (collectively, “Tregaron”), for outsourced services, including email- and chat-based customer and technical support, network monitoring, engineering and development support and web design and web building services, and an office space lease. These entities are owned directly or indirectly by family members of the Company’s chief executive officer, who is also a director and stockholder of the Company. The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by Tregaron and its affiliates under these agreements: As of December 31, 2016 , approximately $1.3 million was included in accounts payable and accrued expense relating to services provided by Tregaron. As of June 30, 2017 , approximately $2.1 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Cost of revenue $ 3,300 $ 3,100 $ 6,400 $ 6,000 Sales and marketing 100 400 200 500 Engineering and development 300 200 600 650 General and administrative — 50 100 100 Total related party transaction expense, net $ 3,700 $ 3,750 $ 7,300 $ 7,250 Innovative Business Services, LLC: The Company also has agreements with Innovative Business Services, LLC (“IBS”), which provides multi-layered third-party security and website performance applications that are sold by the Company. IBS is indirectly majority owned by the Company’s chief executive officer and a director of the Company, each of whom are also stockholders of the Company. During the quarter ended March 31, 2017, the Company’s principal agreement with this entity was amended to permit the Company to purchase a specific IBS website performance product at no charge, and in exchange, to increase the revenue share to IBS on certain website performance products. The Company records revenue on the sale of IBS products on a net basis, since the Company views IBS as the primary obligor to deliver these services. As a result, the revenue share paid by the Company to IBS is recorded as contra-revenue. Further, IBS pays the Company a fee on sales made by IBS directly to customers of the Company. The Company records these fees as revenue. The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Revenue $ (700 ) $ (900 ) $ (1,300 ) $ (2,000 ) Revenue (contra) 2,000 1,950 4,100 4,150 Total related party transaction impact to revenue $ 1,300 $ 1,050 $ 2,800 $ 2,150 Cost of revenue 100 175 300 375 Total related party transaction expense, net $ 1,400 $ 1,225 $ 3,100 $ 2,525 As of December 31, 2016 and June 30, 2017 , approximately $0.2 million and $0.2 million , respectively, was included in prepaid expenses and other current assets relating to the Company’s agreements with IBS. As of December 31, 2016 and June 30, 2017 , approximately $1.1 million and $1.3 million , respectively was included in accounts payable and accrued expense relating to the Company’s agreements with IBS. As of December 31, 2016 and June 30, 2017 , approximately $0.6 million and $0.6 million , respectively, was included in accounts receivable relating to the Company’s agreements with IBS. Goldman, Sachs & Co.: The Company entered into a three -year interest rate cap on December 9, 2015 with a subsidiary of Goldman, Sachs & Co. ("Goldman"). Goldman is a significant shareholder of the Company. Refer to Note 5 : Fair Value Measurements , for further details. Goldman Sachs Lending Partners LLC, a subsidiary of Goldman, was one of the joint bookrunners and joint lead arrangers for the 2017 Refinancing. In that capacity, Goldman Sachs Lending Partners LLC received an arrangement fee of $0.5 million , and was reimbursed for an immaterial amount of expenses.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker. The Company's chief executive officer is the Company's chief operating decision maker. On February 9, 2016, the Company acquired Constant Contact and evaluated the criteria in ASC 280-10-50-11 contemporaneously with this acquisition. Based on the Company's original evaluation, the Company believed that it met the qualitative aggregation criteria in ASC 280-10-50-11, and that the economic characteristics of the Constant Contact and legacy businesses were similar. In particular, at the time of this evaluation, the Company expected that the gross margin of Constant Contact and its legacy business would be similar. However, beginning with the second quarter of 2016, the Company recognized that the legacy business did not meet expectations and as such resulted in lower legacy gross margin than originally anticipated. This was expected to reverse in the near term, however, it continued into the third and fourth quarter. As such, during the Company's annual assessment of segments, and due to the resulting 2016 legacy performance, the Company determined it had two reportable segments: • Email marketing, which includes the products and services acquired as part of the Constant Contact acquisition in February 2016. The services included in this segment are primarily email marketing, and to a lesser extent, event marketing, survey tools and the Single Platform digital storefront product. • Web presence, which consists of all of the Company's web hosting and related services such as domain names, website security, website design tools and services, ecommerce services and other services and tools to expand the online presence of a small business. The Company measures profitability of these segments based on revenue, gross profit, and adjusted EBITDA. The accounting policies of each segment are the same as those described in the summary of significant accounting policies; please refer to Note 2 : Summary of Significant Accounting Policies , for further details. The following tables contain financial information for each reportable segment for the three months and six months ended June 30, 2016 and 2017 : Consolidated Statement of Operations and Comprehensive Income (Loss): Three Months Ended Three Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 196,041 $ 94,672 $ 290,713 $ 193,172 $ 99,086 $ 292,258 Gross profit 86,666 50,970 137,636 82,552 63,123 145,675 Net loss (17,461 ) (15,969 ) (33,430 ) (33,139 ) (2,276 ) (35,415 ) Interest expense, net (1) 18,077 22,775 40,852 20,294 25,179 45,473 Income tax expense (benefit) (4,341 ) (9,590 ) (13,931 ) 3,995 (1,367 ) 2,628 Depreciation 9,098 7,662 16,760 10,525 3,526 14,051 Amortization of other intangible assets 19,768 18,055 37,823 16,375 18,565 34,940 Stock-based compensation 10,429 4,595 15,024 14,345 1,900 16,245 Restructuring expenses 789 4,874 5,663 3,699 769 4,468 Transaction expenses and charges 757 221 978 — 193 193 Loss (gain) of unconsolidated entities 341 — 341 (39 ) — (39 ) Impairment of other long-lived assets 6,848 — 6,848 — — — Adjusted EBITDA $ 44,305 $ 32,623 $ 76,928 $ 36,055 $ 46,489 $ 82,544 Consolidated Statement of Operations and Comprehensive Income (Loss): Six Months Ended Six Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 394,089 $ 133,737 $ 527,826 $ 390,520 $ 196,875 $ 587,395 Gross profit 176,551 61,722 238,273 169,168 122,895 292,063 Net income (loss) 22,673 (42,022 ) (19,349 ) (56,766 ) (10,227 ) (66,993 ) Interest expense, net (1) 35,093 35,996 71,089 37,173 47,698 84,871 Income tax expense (benefit) (88,598 ) (25,235 ) (113,833 ) 14,544 (6,142 ) 8,402 Depreciation 18,075 11,857 29,932 19,763 7,399 27,162 Amortization of other intangible assets 39,523 28,174 67,697 32,280 36,927 69,207 Stock-based compensation 25,075 8,337 33,412 25,445 3,724 29,169 Restructuring expenses 960 16,305 17,265 6,036 4,060 10,096 Transaction expenses and charges 31,114 984 32,098 — 773 773 (Gain) loss of unconsolidated entities (2) (10,386 ) — (10,386 ) (39 ) — (39 ) Impairment of other long-lived assets 8,285 — 8,285 — — — Adjusted EBITDA $ 81,814 $ 34,396 $ 116,210 $ 78,436 $ 84,212 $ 162,648 Consolidated Balance Sheets: As of December 31, 2016 As of June 30, 2017 Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $1,507,977 $1,248,297 $2,756,274 $1,512,346 $1,204,133 $2,716,479 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. For the three and six months ended June 30, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (2) The (gain) loss of unconsolidated entities is reported on a net basis for the three months ended June 30, 2016. The six months ended June 30, 2016 includes a gain of $11.4 million on the Company's investment in WZ UK Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK Ltd. from 49% to 57.5% , which required a revaluation of the Company's existing investment to its implied fair value. This $11.4 million gain was partially offset by the Company's proportionate shares of net losses from unconsolidated entities of $1.0 million .

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company evaluated all subsequent events occurring through August 4, 2017, to determine if any such events should be reflected in these financial statements. There were no material recognized subsequent events recorded in the June 30, 2017 financial statements, except as follows: On July 7, 2017, the Company redeemed the remaining redeemable non-controlling interest from the minority shareholders of WZ UK for $25.0 million .

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Guarantor Financial Information	Supplemental Guarantor Financial Information In February 2016, EIG Investors Corp., a wholly-owned subsidiary of the Company (the “Issuer”), issued $350.0 million aggregate principal amount of its 10.875% Senior Notes due 2024 (the “Original Notes”) (refer to Note 9 : Notes Payable in the consolidated financial statements), which it exchanged for new 10.875% Senior Notes due 2024 (the “Exchange Notes” and together with the Original Notes, collectively, the “Notes”) pursuant to a registration statement on Form S-4. The registered exchange offer for the Notes was completed on January 30, 2017. The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by the Company, and the following wholly-owned subsidiaries: The Endurance International Group, Inc., Bluehost Inc., FastDomain Inc., Domain Name Holding Company, Inc., Endurance International Group – West, Inc., HostGator.com LLC, A Small Orange, LLC, Constant Contact, Inc., and SinglePlatform, LLC, (collectively, the “Subsidiary Guarantors”), subject to certain customary guarantor release conditions. The Company’s other domestic subsidiaries and its foreign subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) have not guaranteed the Notes. The Company sold two immaterial guarantors, CardStar, Inc. and CardStar Publishing, LLC (collectively, "CardStar"), during the quarter ended December 31, 2016. CardStar was released and discharged from the guarantee as a result of the sale and no longer guarantees the debt of the Company as of December 1, 2016. Proceeds from the sale of CardStar were approximately $0.1 million . The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and June 30, 2017, supplemental condensed consolidating results of operations for the three months ended June 30, 2016 and 2017, and cash flow information for the six months ended June 30, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 $ — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 172 $ 3 $ 63,458 $ 17,776 $ — $ 81,409 Restricted cash — — 2,472 929 — 3,401 Accounts receivable — — 8,165 3,499 — 11,664 Prepaid domain name registry fees — — 30,961 25,812 (63 ) 56,710 Prepaid expenses & other current assets 14 57 19,230 9,543 — 28,844 Total current assets 186 60 124,286 57,559 (63 ) 182,028 Intercompany receivables, net 32,614 724,750 (615,827 ) (141,537 ) — — Property and equipment, net — — 80,599 14,026 — 94,625 Goodwill — — 1,685,981 175,627 — 1,861,608 Other intangible assets, net — — 528,901 16,089 — 544,990 Investment in subsidiaries 48,574 1,309,329 43,070 — (1,400,973 ) — Other assets — 4,323 22,629 6,276 — 33,228 Total assets $ 81,374 $ 2,038,462 $ 1,869,639 $ 128,040 $ (1,401,036 ) $ 2,716,479 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 11,040 $ 1,801 $ — $ 12,841 Accrued expenses and other current liabilities — 20,659 67,496 9,968 — 98,123 Deferred revenue — — 308,301 61,817 (293 ) 369,825 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 4,481 — — 4,481 Deferred consideration, short-term — — 4,250 — — 4,250 Total current liabilities — 54,604 395,568 73,586 (293 ) 523,465 Deferred revenue, long-term — — 80,693 10,563 — 91,256 Notes payable — 1,936,258 — — — 1,936,258 Capital lease obligations — — 1,537 — — 1,537 Deferred consideration — — 3,412 25 — 3,437 Other long-term liabilities — (974 ) 54,100 796 — 53,922 Total liabilities — 1,989,888 535,310 84,970 (293 ) 2,609,875 Redeemable non-controlling interest — — 25,000 — — 25,000 Equity 81,374 48,574 1,309,329 43,070 (1,400,743 ) 81,604 Total liabilities and equity $ 81,374 $ 2,038,462 $ 1,869,639 $ 128,040 $ (1,401,036 ) $ 2,716,479 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 257,712 $ 34,324 $ (1,323 ) $ 290,713 Cost of revenue — — 131,629 22,942 (1,494 ) 153,077 Gross profit — — 126,083 11,382 171 137,636 Operating expense: Sales and marketing — — 62,747 17,571 (9 ) 80,309 Engineering and development — — 20,883 6,804 — 27,687 General and administrative — 76 31,232 3,522 — 34,830 Transaction costs — — 999 (21 ) — 978 Total operating expense — 76 115,861 27,876 (9 ) 143,804 Income (loss) from operations — (76 ) 10,222 (16,494 ) 180 (6,168 ) Interest expense and other income, net — 39,985 863 4 — 40,852 Income (loss) before income taxes and equity earnings of unconsolidated entities — (40,061 ) 9,359 (16,498 ) 180 (47,020 ) Income tax expense (benefit) — (15,654 ) 2,697 (974 ) — (13,931 ) Loss before equity earnings of unconsolidated entities — (24,407 ) 6,662 (15,524 ) 180 (33,089 ) Equity loss of unconsolidated entities, net of tax 33,612 9,203 15,865 92 (58,431 ) 341 Net loss (33,612 ) (33,610 ) (9,203 ) (15,616 ) 58,611 (33,430 ) Net loss attributable to non-controlling interest — — (5,390 ) — — (5,390 ) Net loss attributable to Endurance International Group Holdings, Inc. $ (33,612 ) $ (33,610 ) $ (3,813 ) $ (15,616 ) $ 58,611 $ (28,040 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 540 — 540 Unrealized gain (loss) on cash flow hedge, net of taxes — (427 ) — — — (427 ) Total comprehensive loss $ (33,612 ) $ (34,037 ) $ (3,813 ) $ (15,076 ) $ 58,611 $ (27,927 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Six months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 461,781 $ 67,701 $ (1,656 ) $ 527,826 Cost of revenue — — 246,260 45,357 (2,064 ) 289,553 Gross profit — — 215,521 22,344 408 238,273 Operating expense: Sales and marketing — — 116,976 42,642 (15 ) 159,603 Engineering and development — — 33,781 10,161 — 43,942 General and administrative — 120 68,052 6,937 — 75,109 Transaction costs — — 32,098 — — 32,098 Total operating expense — 120 250,907 59,740 (15 ) 310,752 Income (loss) from operations — (120 ) (35,386 ) (37,396 ) 423 (72,479 ) Interest expense and other income, net — 69,341 (9,577 ) (85 ) — 59,679 Income (loss) before income taxes and equity earnings of unconsolidated entities — (69,461 ) (25,809 ) (37,311 ) 423 (132,158 ) Income tax expense (benefit) — (26,870 ) (86,437 ) (526 ) — (113,833 ) Loss before equity earnings of unconsolidated entities — (42,591 ) 60,628 (36,785 ) 423 (18,325 ) Equity loss of unconsolidated entities, net of tax 19,773 (22,820 ) 37,810 92 (33,831 ) 1,024 Net loss (19,773 ) (19,771 ) 22,818 (36,877 ) 34,254 (19,349 ) Net loss attributable to non-controlling interest — — (13,120 ) — — (13,120 ) Net loss attributable to Endurance International Group Holdings, Inc. $ (19,773 ) $ (19,771 ) $ 35,938 $ (36,877 ) $ 34,254 $ (6,229 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 882 — 882 Unrealized gain (loss) on cash flow hedge, net of taxes — (1,938 ) — — — (1,938 ) Total comprehensive loss $ (19,773 ) $ (21,709 ) $ 35,938 $ (35,995 ) $ 34,254 $ (7,285 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 259,725 $ 33,769 $ (1,236 ) $ 292,258 Cost of revenue — — 125,511 22,148 (1,076 ) 146,583 Gross profit — — 134,214 11,621 (160 ) 145,675 Operating expense: Sales and marketing — — 65,948 6,158 — 72,106 Engineering and development — — 18,351 1,798 — 20,149 General and administrative — 55 37,712 2,813 — 40,580 Transaction costs — — 193 — — 193 Total operating expense — 55 122,204 10,769 — 133,028 Income (loss) from operations — (55 ) 12,010 852 (160 ) 12,647 Interest expense and other income, net — 45,406 247 (180 ) — 45,473 Income (loss) before income taxes and equity earnings of unconsolidated entities — (45,461 ) 11,763 1,032 (160 ) (32,826 ) Income tax expense (benefit) — (16,794 ) 19,555 (133 ) — 2,628 Loss before equity earnings of unconsolidated entities — (28,667 ) (7,792 ) 1,165 (160 ) (35,454 ) Equity loss of unconsolidated entities, net of tax 35,256 6,589 (1,204 ) — (40,680 ) (39 ) Net loss (35,256 ) (35,256 ) (6,588 ) 1,165 40,520 (35,415 ) Net loss attributable to non-controlling interest — — 3,714 — — 3,714 Net loss attributable to Endurance International Group Holdings, Inc. $ (35,256 ) $ (35,256 ) $ (10,302 ) $ 1,165 $ 40,520 $ (39,129 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,228 — 1,228 Unrealized gain (loss) on cash flow hedge, net of taxes — (176 ) — — — (176 ) Total comprehensive loss $ (35,256 ) $ (35,432 ) $ (10,302 ) $ 2,393 $ 40,520 $ (38,077 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Six months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 521,821 $ 68,302 $ (2,728 ) $ 587,395 Cost of revenue — — 253,403 44,237 (2,308 ) 295,332 Gross profit — — 268,418 24,065 (420 ) 292,063 Operating expense: Sales and marketing — — 134,016 10,865 (3 ) 144,878 Engineering and development — — 33,641 6,870 — 40,511 General and administrative — 110 73,383 6,167 — 79,660 Transaction costs — — 773 — — 773 Total operating expense — 110 241,813 23,902 (3 ) 265,822 Income (loss) from operations — (110 ) 26,605 163 (417 ) 26,241 Interest expense and other income, net — 84,652 394 (175 ) — 84,871 Income (loss) before income taxes and equity earnings of unconsolidated entities — (84,762 ) 26,211 338 (417 ) (58,630 ) Income tax expense (benefit) — (31,311 ) 39,250 463 — 8,402 Loss before equity earnings of unconsolidated entities — (53,451 ) (13,039 ) (125 ) (417 ) (67,032 ) Equity loss of unconsolidated entities, net of tax 66,577 13,127 87 — (79,830 ) (39 ) Net loss (66,577 ) (66,578 ) (13,126 ) (125 ) 79,413 (66,993 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net loss attributable to Endurance International Group Holdings, Inc. $ (66,577 ) $ (66,578 ) $ (20,650 ) $ (125 ) $ 79,413 $ (74,517 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,914 — 1,914 Unrealized gain (loss) on cash flow hedge, net of taxes — (392 ) — — — (392 ) Total comprehensive loss $ (66,577 ) $ (66,970 ) $ (20,650 ) $ 1,789 $ 79,413 $ (72,995 ) Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ — $ (22,903 ) $ 108,768 $ (20,250 ) $ — $ 65,615 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (899,889 ) — — (899,889 ) Purchases of property and equipment — — (17,881 ) (3,080 ) — (20,961 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 252 — — 252 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (11 ) (16 ) — (27 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (421 ) — (768 ) Net cash used in investing activities — — (923,476 ) (3,517 ) — (926,993 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,072,178 — — — 1,072,178 Repayment of notes payable and revolver — (116,850 ) — — — (116,850 ) Payment of financing costs — (51,727 ) — — — (51,727 ) Payment of deferred consideration — — (37 ) (670 ) — (707 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (2,896 ) — — (2,896 ) Proceeds from exercise of stock options 1,328 — — — — 1,328 Capital investments from minority partner — — — 1,000 — 1,000 Intercompany loans and investments (1,332 ) (880,752 ) 854,910 27,174 — — Net cash provided by (used in) financing activities (4 ) 22,849 851,977 27,504 — 902,326 Net effect of exchange rate on cash and cash equivalents — — — 1,614 — 1,614 Net increase (decrease) in cash and cash equivalents (4 ) (54 ) 37,269 5,351 — 42,562 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 8 $ 13 $ 58,555 $ 17,016 $ — $ 75,592 Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (14 ) $ (47,489 ) $ 126,047 $ 3,878 $ — $ 82,422 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — — — — — Purchases of property and equipment — — (17,020 ) (2,275 ) — (19,295 ) Cash paid for minority investments — — — — — — Proceeds from sale of property and equipment — — 287 — — 287 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (1,646 ) (34 ) — (1,680 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — 148 (248 ) — (100 ) Net cash used in investing activities — — (18,231 ) (2,557 ) — (20,788 ) Cash flows from financing activities: — Proceeds from issuance of term loan and notes, net of original issue discounts — 1,693,007 — — — 1,693,007 Repayment of term loans — (1,714,661 ) — — — (1,714,661 ) Payment of financing costs — (6,060 ) — — — (6,060 ) Payment of deferred consideration — — (4,550 ) (858 ) — (5,408 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (3,908 ) — — (3,908 ) Proceeds from exercise of stock options 1,132 — — — — 1,132 Capital investments from minority partner — — — — — — Intercompany loans and investments (949 ) 75,202 (74,934 ) 681 — — Net cash provided by (used in) financing activities 183 47,488 (83,392 ) (177 ) — (35,898 ) Net effect of exchange rate on cash and cash equivalents — — — 2,077 — 2,077 Net increase (decrease) in cash and cash equivalents 169 (1 ) 24,424 3,221 — 27,813 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 172 $ 3 $ 63,458 $ 17,776 $ — $ 81,409

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Preparation	Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions were eliminated on consolidation.
Segment Information	Segment Information The Company has reviewed the criteria of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 280-10, Segment Reporting , and determined that the Company is comprised of two segments for reporting purposes: web presence and email marketing. The web presence segment consists predominantly of the Company's web hosting brands and related products such as domain names, website security tools, website design tools and services, ecommerce tools and other services designed to grow the online presence of a small business. The email marketing segment consists of Constant Contact email marketing tools and the SinglePlatform digital storefront product, both of which the Company acquired in the February 2016 acquisition of Constant Contact, Inc. ("Constant Contact").
Use of Estimates	Use of Estimates U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates, judgments and assumptions used in preparing the accompanying consolidated financial statements are based on the relevant facts and circumstances as of the date of the consolidated financial statements. Although the Company regularly assesses these estimates, judgments and assumptions used in preparing the consolidated financial statements, actual results could differ from those estimates. Changes in estimates are recorded in the period in which they become known. The more significant estimates reflected in these consolidated financial statements include estimates of fair value of assets acquired and liabilities assumed under purchase accounting related to the Company’s acquisitions and when evaluating goodwill and long-lived assets for potential impairment, the estimated useful lives of intangible and depreciable assets, revenue recognition for multiple-element arrangements, stock-based compensation, contingent consideration, derivative instruments, certain accruals, reserves and deferred taxes.
Unaudited Interim Financial Information	Unaudited Interim Financial Information The accompanying interim consolidated balance sheet as of June 30, 2017 , and the related consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2016 and 2017 , cash flows for the six months ended June 30, 2016 and 2017 , and the notes to consolidated financial statements are unaudited. These unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements. The unaudited consolidated financial statements include, in the opinion of management, all adjustments, consisting only of normal recurring adjustments that are necessary for a fair presentation of the Company’s financial position at June 30, 2017 , results of operations for the three and six months ended June 30, 2016 and 2017 and cash flows for the six months ended June 30, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive loss are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2017 .
Accounts Receivable	Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable.
Prepaid Domain Name Registry Fees	Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging, or ASC 815, provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in FASB Accounting Standards Update ("ASU") 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.
Property and Equipment	Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Software Development Costs	Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, Internal-Use Software. Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable.
Goodwill	Goodwill Goodwill relates to amounts that arose in connection with the Company’s various business combinations and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, including a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. Additionally, the reorganization or change in the number of reporting units could result in the reassignment of goodwill between reporting units and may trigger an impairment assessment. In accordance with ASC 350, Intangibles—Goodwill and Other , or ASC 350, the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. Under U.S. GAAP, a reporting unit is either the equivalent of, or one level below, an operating segment. As of December 31, 2016, the Company determined it operates in two segments and that each segment is its own reporting unit, and as such, the Company has two reporting units, email marketing and web presence. The provisions of ASC 350 require that a two-step impairment test be performed for goodwill. In the first step, the Company compares the fair value of its reporting unit to which goodwill has been allocated to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. As of December 31, 2016, the Company determined fair values for each of the reporting units based on consideration of the income approach, the market comparable approach and the market transaction approach. For purposes of the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses its internal forecasts to estimate future after-tax cash flows and include an estimate of long-term future growth rates based on its most recent views of the long-term outlook for each reporting unit. Actual results may differ from those assumed in our forecasts. The Company derived its discount rates using the weighted average cost of capital, using betas observed in its industry and published rates for industries relevant to our reporting units. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the respective business and its internally developed forecasts. Discount rates used in the Company's reporting unit valuations ranged from 11.0% to 12.0% . For purposes of the market approach, the Company uses a valuation technique in which values are derived based on market prices of comparable publicly traded companies. The Company also uses a market based valuation technique in which values are determined based on relevant observable information generated by market transactions involving comparable businesses. The Company assesses each valuation methodology based upon the relevance and availability of the data at the time it performs the valuation and weights the methodologies appropriately. The carrying values of the reporting units were determined through specific allocation of assets and liabilities to the reporting units, and an apportionment method relating to our debt, whereby debt that was incurred in order to finance the acquisition of assets or businesses of a reporting unit was allocated to that reporting unit. In prior years, the Company had only one reporting unit. Subsequent to the acquisition of Constant Contact, and as described in Note 19: Segment Information , the Company determined that there is a second reporting unit relating to email marketing. The Company has allocated the fair value of the goodwill acquired through its acquisitions to the applicable reporting unit, and allocated the fair value of the goodwill acquired through its acquisition of Constant Contact to its email marketing reporting unit.
Long-Lived Assets	Long-Lived Assets The Company’s long-lived assets consist primarily of intangible assets, including acquired subscriber relationships, trade names, intellectual property, developed technology, domain names available for sale and in-process research and development (“IPR&D”). The Company also has long-lived tangible assets, primarily consisting of property and equipment. The majority of the Company’s intangible assets are recorded in connection with its various acquisitions. The Company’s intangible assets are recorded at fair value at the time of their acquisition. The Company amortizes intangible assets over their estimated useful lives. Determination of the estimated useful lives of the individual categories of intangible assets is based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives other than developed technology is recognized in accordance with their estimated projected cash flows. Developed technology is amortized on a straight line basis over the estimated useful economic life which has a weighted average useful life of 7 years . The Company evaluates long-lived intangible and tangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. No such impairment losses have been identified in the three and six months ended June 30, 2016 and 2017 . Indefinite life intangible assets include domain names that are available for sale which are recorded at cost to acquire. These assets are not being amortized and are being tested for impairment annually and whenever events or changes in circumstance indicate that their carrying value may not be recoverable. When a domain name is sold, the Company records the cost of the domain in cost of revenue.
Acquired In-Process Research and Development (IPR&D)	Acquired In-Process Research and Development (IPR&D) Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires in connection with business combinations that have not been completed at the date of acquisition. The acquired IPR&D is capitalized as an intangible asset and reviewed on a quarterly basis to determine future use. Any impairment loss of the acquired IPR&D is charged to expense in the period the impairment is identified. During the six months ended June 30, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired as these projects were abandoned during the three months ended March 31, 2016. At that time, the Company recorded a $ 1.4 million impairment charge, which is reflected in engineering and development expense in the Company’s consolidated statements of operations and comprehensive loss.
Revenue Recognition	Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period, whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of FASB ASU No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force, and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, and other cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The Company analyzes the selling prices used in its allocation of transaction amount, at a minimum, on a quarterly basis. Selling prices are analyzed on a more frequent basis if a significant change in the business necessitates a more timely analysis. The Company maintains a reserve for refunds and chargebacks related to revenue that has been recognized and is expected to be refunded. The Company had a refund and chargeback reserve of $0.6 million and $0.5 million as of December 31, 2016 and June 30, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and June 30, 2017 was $2.1 million . Based on refund history, approximately 84% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 95% of all refunds happen within 45 days of the contract start or renewal date.
Income Taxes	Income Taxes Income taxes are accounted for in accordance with ASC 740, Accounting for Income Taxes , or ASC 740. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. ASC 740 clarifies the accounting for income taxes by prescribing a minimum recognition threshold that a tax position is required to meet before being recognized in the financial statements. The Company recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is more likely than not to be realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. There were no unrecognized tax benefits in the three or six months ended June 30, 2016 and 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses
Stock-Based Compensation	Stock-Based Compensation The Company may issue restricted stock units, restricted stock awards and stock options which vest upon the satisfaction of a performance condition and/or a service condition. The Company follows the provisions of ASC 718, Compensation—Stock Compensation , or ASC 718, which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods, net of estimated forfeitures. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. In addition, for stock-based awards where vesting is dependent upon achieving certain performance goals, the Company estimates the likelihood of achieving the performance goals against established performance targets. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards granted, the Company estimates the fair value of each restricted stock award based on the closing trading price of its common stock on the date of grant.
Net Loss per Share	Net Loss per Share The Company considered ASC 260-10, Earnings per Share , or ASC 260-10, which requires the presentation of both basic and diluted earnings per share in the consolidated statements of operations and comprehensive loss. The Company’s basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period, and, if there are dilutive securities, diluted income per share is computed by including common stock equivalents which includes shares issuable upon the exercise of stock options, net of shares assumed to have been purchased with the proceeds, using the treasury stock method.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - Recently Adopted In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the consolidated statements of cash flows. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 which required it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that included the interim period of adoption. The impact of the adoption resulted in the following: • Due to the Company's net shortfall position upon the time of adoption, the new standard resulted in additional tax expense in our provision for income taxes rather than paid-in capital of $0.9 million for the year ended December 31, 2016. The Company's beginning retained earnings was not impacted by the early adoption as the Company had a full valuation allowance against the U.S. deferred tax assets as of December 31, 2015. • As a result of prior guidance that required excess tax benefits reduce taxes payable prior to recognition as an increase in paid in capital, the Company had not recognized certain deferred tax assets (loss carry-forwards) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. As of January 1, 2016, the Company had generated federal and state net operating loss carry-forwards due to excess tax benefits of $1.5 million and $0.7 million , respectively. • The Company elected to eliminate the forfeiture rate and adopted the new policy to account for forfeitures in the period that they are incurred, and applied this policy on a modified retrospective basis. The impact of eliminating the forfeiture rate increased the stock compensation recorded in 2016 by $0.9 million , which included an immaterial prior period adjustment that the Company recorded through the consolidated statement of operations and comprehensive loss for the year ended December 31, 2016. In March 2016, the FASB issued ASU No. 2016-07, Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . This new guidance removes the requirement for retroactive adjustment when an increase or decrease in the level of ownership qualifies an investment for the equity method. This amendment is effective for fiscal years beginning after December 15, 2016. The adoption of this standard did not have a material impact on the Company's financial position or results of operations. Recent Accounting Pronouncements - Recently Issued In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or Accounting Standard Update 2014-09, which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. Since then, the FASB has also issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606), Principals versus Agent Considerations and ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing , which further elaborate on the original ASU No. 2014-09. The core principle of these updates is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgments and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. In July 2015, the FASB approved a one -year deferral of the effective date to January 1, 2018, with early adoption to be permitted as of the original effective date of January 1, 2017. Once this standard becomes effective, companies may use either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). The Company has performed an initial assessment of ASU 2014-09, and expects that this new guidance will impact the timing of when certain sales incentive payments, primarily to external parties, are charged to expense as these payments must be deferred over the expected life of the related customer relationship. The Company also expects that a considerable portion of its revenue recognition will not be materially impacted by this new guidance. The Company is currently calculating the impact of all expected changes from this guidance, and expects to have these calculations complete during the second half of fiscal 2017. After completing these calculations, the Company will then determine the transition method to be applied upon adoption. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . This new standard enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases . The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but expects that adoption will increase its assets and liabilities. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments . This new standard clarifies certain statement of cash flow presentation issues. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory . This new standard improves the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This amendment is effective for annual periods beginning after December 15, 2018, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows: Restricted Cash . This new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and restricted cash. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment . This new standard eliminates the second step of the goodwill impairment test described in Note 2: Goodwill , and instead requires that the entity perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied on a prospective basis. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718) . This new standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. This amendment is effective for annual or interim periods in fiscal years beginning after December 15, 2017, and should be applied prospectively to an award modified on or after the adoption date. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Estimated Useful Lives	Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Summary of Calculation of Basic and Diluted Net Loss Per Share	Three Months Ended Six Months Ended 2016 2017 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net income (loss) attributable to Endurance International Group Holdings, Inc. $ (28,040 ) $ (39,129 ) $ (6,229 ) $ (74,517 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net loss per share attributable to Endurance International Group Holdings Inc. $ (0.21 ) $ (0.29 ) $ (0.05 ) $ (0.55 ) Diluted net loss per share attributable to Endurance International Group Holdings Inc. $ (0.21 ) $ (0.29 ) $ (0.05 ) $ (0.55 ) Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.: Basic 132,566,622 137,295,120 132,736,382 136,124,347 Diluted 132,566,622 137,295,120 132,736,382 136,124,347
Summary of Weighted Average Potentially Dilutive Shares Excluded From Calculation of Diluted Loss Per Share	The following number of weighted average potentially dilutive shares were excluded from the calculation of diluted loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2017 2016 2017 (unaudited) Restricted stock awards and units 9,014,101 2,472,180 8,138,075 3,212,653 Options 11,194,982 10,609,589 9,972,490 10,831,922 Total 20,209,083 13,081,769 18,110,565 14,044,575

Acquisitions (Tables)

Acquisitions (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Summary of Deferred Consideration Related to Acquisition	Components of short-term and long-tern deferred consideration as of December 31, 2016 and June 30, 2017 , consisted of the following: December 31, 2016 June 30, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — — — Social Booster (Acquired in 2016) 40 25 25 — AppMachine (Acquired in 2016) 4,365 7,419 4,225 3,437 Total $ 5,273 $ 7,444 $ 4,250 $ 3,437

Property and Equipment and Ca31

Property and Equipment and Capital Lease Obligations (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Components of property and equipment consisted of the following: December 31, 2016 June 30, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 5,610 Software 52,130 61,699 Computers and office equipment 143,091 156,603 Furniture and fixtures 10,892 10,846 Leasehold improvements 21,244 21,559 Construction in process 6,691 9,121 Property and equipment—at cost 240,355 266,228 Less accumulated depreciation (145,083 ) (171,603 ) Property and equipment—net $ 95,272 $ 94,625

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Basis of Fair Value Measurements	Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration (included in deferred consideration) $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at June 30, 2017 Financial assets: Interest rate cap (included in other assets) $ 234 — $ 234 $ — Total financial assets $ 234 $ — $ 234 $ —
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs	The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of June 30, 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2016 $ 818 Payment of contingent earn-outs related to 2012 acquisition (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at June 30, 2017 $ —

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill Balances	The following table summarizes the changes in the Company’s goodwill balances from December 31, 2016 to June 30, 2017 for the Company’s two reporting units: Web Presence Unit Email Marketing Unit Total Amount Amount Amount (in thousands) (in thousands) (in thousands) Goodwill balance at December 31, 2016 $ 1,255,604 $ 604,305 $ 1,859,909 Goodwill related to 2016 acquisitions — — — Foreign translation impact 1,699 — 1,699 Goodwill balance at June 30, 2017 $ 1,257,303 $ 604,305 $ 1,861,608
Summary of Other Intangible Assets	At December 31, 2016 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 284,005 $ 111,348 $ 172,657 7 years Subscriber relationships 659,662 345,070 314,592 7 years Trade-names 133,805 57,789 76,016 8 years Intellectual property 34,084 10,270 23,814 13 years Domain names available for sale 29,954 4,976 24,978 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2016 $ 1,141,824 $ 529,767 $ 612,057 During the six months ended June 30, 2016, the Company wrote-off acquired in-process research and development of $ 1.4 million related to its acquisition of Webzai in 2014, as the Company had abandoned certain research and development projects in favor of other projects in the quarter ended March 31, 2016, when these projects were abandoned. Additionally, during the three and six months ended June 30, 2016, the Company recorded an impairment charge of $4.4 million relating to developed technology from the Webzai acquisition, after evaluating it for impairment in accordance with ASC 350. This developed technology is also linked to certain internally developed software that was developed at Webzai after its acquisition by the Company which was also determined to be impaired. There were no impairment charges of intangible assets during the three and six months ended June 30, 2017 . At June 30, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,748 $ 128,654 $ 157,094 7 years Subscriber relationships 659,712 387,464 272,248 7 years Trade-names 133,804 64,807 68,997 8 years Intellectual property 34,278 11,990 22,288 13 years Domain names available for sale 30,258 5,895 24,363 Indefinite Leasehold interests 314 314 — 1 year Total June 30, 2017 $ 1,144,114 $ 599,124 $ 544,990

Notes Payable (Tables)

Notes Payable (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	As of December 31, 2016 and June 30, 2017 , the Incremental First Lien had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issuance discount (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — s of December 31, 2016 and June 30, 2017 , the 2017 First Lien had an outstanding balance of: At June 30, 2017 (in thousands) 2017 First Lien Term Loan $ 1,688,764 Unamortized deferred financing costs (24,492 ) Unamortized original issue discount (21,951 ) Net 2017 First Lien Term Loan 1,642,321 Current portion of 2017 First Lien Term Loan (33,945 ) 2017 First Lien Term Loan - long term $ 1,608,376 As of December 31, 2016 and June 30, 2017 , the 2013 First Lien had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ — As of December 31, 2016 and June 30, 2017 , the Notes had an outstanding balance of: At December 31, 2016 At June 30, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (16,130 ) Unamortized original issuance discount (6,282 ) (5,988 ) Net Senior Notes 326,480 327,882 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 327,882 At December 31, 2016 and June 30, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: At December 31, 2016 At June 30, 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,642,321 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Notes 326,480 327,882 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,970,203 Current Portion of Notes Payable 35,700 33,945 Notes Payable - long term $ 1,951,280 $ 1,936,258
Summary of Future Debt Maturities	The maturity of the notes payable at June 30, 2017 is as follows: Amounts maturing in: (in thousands) (Remainder of) 2017 $ 16,973 2018 33,945 2019 33,945 2020 33,945 2021 33,945 Thereafter 1,886,011 Total $ 2,038,764
Summary of Interest Rates and Interest Expense	The following table provides a summary of interest rates and interest expense for the three or six months ended June 30, 2016 and 2017 : Three Months Ended June 30, 2016 Three Months Ended June 30, 2017 Six Months Ended June 30, 2016 Six Months Ended June 30, 2017 (percentage per annum) Interest rate—LIBOR 6.00%-7.75% 5.14%-6.68% 6.00%-7.75% 5.14%-6.68% Interest rate—reference 7.50%-8.50% * 7.50%-8.50% * Interest rate—Senior Notes 10.875 % 10.875 % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % 0.50 % (dollars in thousands) Interest expense and service fees $ 37,512 $ 36,165 $ 65,508 $ 72,820 Loss on extinguishment of debt — 992 — 992 Deferred financing fees immediately expensed — 5,487 — 5,487 Amortization of deferred financing fees 1,651 1,786 2,562 3,530 Amortization of original issue discounts 823 886 1,272 1,732 Amortization of net present value of deferred consideration 799 187 1,582 377 Other interest expense 209 155 441 236 Total interest expense $ 40,994 $ 45,658 $ 71,365 $ 85,174 * The Company did not have debt bearing interest based on the reference rate for the three months and six months ended June 30, 2017.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Summary of Changes in Stockholders' Equity	The following table presents the changes in total stockholders’ equity: Total Stockholders’ Equity (in thousands) Balance at December 31, 2016 $ 124,383 Stock-based compensation 28,357 Reclassification of stock-compensation liability award 450 Stock option exercises 1,132 Foreign currency translation adjustment 1,914 Unrealized loss on derivative (392 ) Net loss attributable to non-controlling interest 277 Net loss attributable to Endurance International Group (74,517 ) Balance at June 30, 2017 $ 81,604

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Awards and Restricted Stock Units	The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the six months ended June 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Granted 2,496,646 $ 7.84 Vested and unissued (188,511 ) $ 7.85 Cancelled (45,464 ) $ 7.85 Non-vested at June 30, 2017 2,363,040 $ 7.91
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Awards and Restricted Stock Units	The following table provides a summary of the Company’s restricted stock award activity for the 2013 Plan during the six months ended June 30, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (1,867,736 ) $ 10.58 Canceled (87,421 ) $ 12.78 Non-vested at June 30, 2017 5,537,808 $ 13.95
2011 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Total Stock-Based Compensation Expense	The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) Cost of revenue $ 1,703 $ 1,661 $ 2,473 $ 3,167 Sales and marketing 2,677 2,911 4,399 4,764 Engineering and development 1,441 1,728 2,205 2,899 General and administrative 9,203 9,945 24,335 18,339 Total stock-based compensation expense $ 15,024 $ 16,245 $ 33,412 $ 29,169
Summary of Stock Options	The following table provides a summary of the Company’s stock options as of June 30, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the six months ended June 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted/ Exchanged 14,724 $ 8.15 Exercised (196,167 ) $ 5.77 Forfeited (333,361 ) $ 9.99 Expired (17,097 ) $ 8.69 Outstanding at June 30, 2017 1,399,929 $ 8.83 4.5 $ 1,087 Exercisable at June 30, 2017 697,592 $ 8.31 3.6 $ 823 Expected to vest after June 30, 2017 (1) 702,337 $ 9.35 5.4 $ 264 Exercisable as of June, 2017 and expected to vest (2) 1,399,929 $ 8.83 4.5 $ 1,087 (1) This represents the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of June 30, 2017 plus the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on June 30, 2017 of $8.35 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options.
Summary of Restricted Stock Awards and Restricted Stock Units	The following table provides a summary of the Company’s restricted stock unit activity for the 2011 Plan during the six months ended June 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 1,114,191 $ 7.85 Vested (536,126 ) $ 7.30 Canceled (350,377 ) $ 8.94 Non-vested at June 30, 2017 1,701,343 $ 8.21
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Stock Options	The following table provides a summary of the Company’s stock options as of June 30, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the six months ended June 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 110,433 $ 8.15 Exercised — $ — Forfeited (179,758 ) $ 13.24 Expired (209,074 ) $ 13.68 Outstanding at June 30, 2017 9,329,032 $ 12.71 7.4 $ 63 Exercisable at June 30, 2017 5,875,021 $ 12.90 6.8 $ — Expected to vest after June 30, 2017 (1) 3,454,011 $ 12.38 8.2 $ — Exercisable as of June 30, 2017 and expected to vest (2) 9,329,032 $ 12.71 7.4 $ 63 (1) This represents the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of June 30, 2017 plus the number of unvested options outstanding as of June 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on June 30, 2017 of $8.35 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table presents the components of accumulated other comprehensive loss (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2016 $ (2,395 ) $ (1,271 ) $ (3,666 ) Other comprehensive income (loss) 1,914 (392 ) 1,522 Balance at June 30, 2017 $ (481 ) $ (1,663 ) $ (2,144 )

Redeemable Non-controlling In38

Redeemable Non-controlling Interest (Tables)	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Schedule of Change in Redeemable Non-controlling Interest	The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling Interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Balance as of June 30, 2017 $ 25,000

Severance and Other Exit Costs

Severance and Other Exit Costs (Tables)	6 Months Ended
	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Summary of Total Restructuring Charges Recorded in the Consolidated Statements of Operations and Comprehensive Loss	The following table presents restructuring charges recorded in the consolidated statements of operations and comprehensive loss for the periods presented: For the Three Months Ended June 30, For the Six Months Ended June 30, 2016 2017 2016 2017 (in thousands) Cost of revenue $ 2,137 $ 700 $ 5,602 $ 3,443 Sales and marketing 1,267 875 5,168 2,249 Engineering and development 1,224 426 3,242 1,078 General and administrative 1,035 2,467 3,253 3,325 Total restructuring charges $ 5,663 $ 4,468 $ 17,265 $ 10,095
Employee Severance
Restructuring Cost and Reserve [Line Items]
Summary of Aggregate Activity Related to Company's Facilities Exit Costs Accrual and Severance Accrual	The following table provides a summary of the aggregate activity for the six months ended June 30, 2017 related to the Company’s combined Restructuring Plans severance accrual: Employee Severance (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 633 $ 926 $ 1,559 Severance charges 5,340 3,686 9,026 Cash paid (2,765 ) (2,463 ) (5,228 ) Balance at June 30, 2017 $ 3,208 $ 2,149 $ 5,357
Facilities Closing
Restructuring Cost and Reserve [Line Items]
Summary of Aggregate Activity Related to Company's Facilities Exit Costs Accrual and Severance Accrual	The following table provides a summary of the aggregate activity for the six months ended June 30, 2017 related to the Company’s combined Restructuring Plans facilities exit accrual: Facilities (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 273 $ 8,747 $ 9,020 Facility adjustments 573 498 1,071 Sublease income received 352 — 352 Cash paid (451 ) (2,404 ) (2,855 ) Balance at June 30, 2017 $ 747 $ 6,841 $ 7,588

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2017
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Summary of Related Party Transactions	The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by Tregaron and its affiliates under these agreements: As of December 31, 2016 , approximately $1.3 million was included in accounts payable and accrued expense relating to services provided by Tregaron. As of June 30, 2017 , approximately $2.1 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Cost of revenue $ 3,300 $ 3,100 $ 6,400 $ 6,000 Sales and marketing 100 400 200 500 Engineering and development 300 200 600 650 General and administrative — 50 100 100 Total related party transaction expense, net $ 3,700 $ 3,750 $ 7,300 $ 7,250
Director
Related Party Transaction [Line Items]
Summary of Related Party Transactions	The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended Six Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Revenue $ (700 ) $ (900 ) $ (1,300 ) $ (2,000 ) Revenue (contra) 2,000 1,950 4,100 4,150 Total related party transaction impact to revenue $ 1,300 $ 1,050 $ 2,800 $ 2,150 Cost of revenue 100 175 300 375 Total related party transaction expense, net $ 1,400 $ 1,225 $ 3,100 $ 2,525

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables contain financial information for each reportable segment for the three months and six months ended June 30, 2016 and 2017 : Consolidated Statement of Operations and Comprehensive Income (Loss): Three Months Ended Three Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 196,041 $ 94,672 $ 290,713 $ 193,172 $ 99,086 $ 292,258 Gross profit 86,666 50,970 137,636 82,552 63,123 145,675 Net loss (17,461 ) (15,969 ) (33,430 ) (33,139 ) (2,276 ) (35,415 ) Interest expense, net (1) 18,077 22,775 40,852 20,294 25,179 45,473 Income tax expense (benefit) (4,341 ) (9,590 ) (13,931 ) 3,995 (1,367 ) 2,628 Depreciation 9,098 7,662 16,760 10,525 3,526 14,051 Amortization of other intangible assets 19,768 18,055 37,823 16,375 18,565 34,940 Stock-based compensation 10,429 4,595 15,024 14,345 1,900 16,245 Restructuring expenses 789 4,874 5,663 3,699 769 4,468 Transaction expenses and charges 757 221 978 — 193 193 Loss (gain) of unconsolidated entities 341 — 341 (39 ) — (39 ) Impairment of other long-lived assets 6,848 — 6,848 — — — Adjusted EBITDA $ 44,305 $ 32,623 $ 76,928 $ 36,055 $ 46,489 $ 82,544 Consolidated Statement of Operations and Comprehensive Income (Loss): Six Months Ended Six Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 394,089 $ 133,737 $ 527,826 $ 390,520 $ 196,875 $ 587,395 Gross profit 176,551 61,722 238,273 169,168 122,895 292,063 Net income (loss) 22,673 (42,022 ) (19,349 ) (56,766 ) (10,227 ) (66,993 ) Interest expense, net (1) 35,093 35,996 71,089 37,173 47,698 84,871 Income tax expense (benefit) (88,598 ) (25,235 ) (113,833 ) 14,544 (6,142 ) 8,402 Depreciation 18,075 11,857 29,932 19,763 7,399 27,162 Amortization of other intangible assets 39,523 28,174 67,697 32,280 36,927 69,207 Stock-based compensation 25,075 8,337 33,412 25,445 3,724 29,169 Restructuring expenses 960 16,305 17,265 6,036 4,060 10,096 Transaction expenses and charges 31,114 984 32,098 — 773 773 (Gain) loss of unconsolidated entities (2) (10,386 ) — (10,386 ) (39 ) — (39 ) Impairment of other long-lived assets 8,285 — 8,285 — — — Adjusted EBITDA $ 81,814 $ 34,396 $ 116,210 $ 78,436 $ 84,212 $ 162,648 Consolidated Balance Sheets: As of December 31, 2016 As of June 30, 2017 Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $1,507,977 $1,248,297 $2,756,274 $1,512,346 $1,204,133 $2,716,479 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. For the three and six months ended June 30, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (2) The (gain) loss of unconsolidated entities is reported on a net basis for the three months ended June 30, 2016. The six months ended June 30, 2016 includes a gain of $11.4 million on the Company's investment in WZ UK Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK Ltd. from 49% to 57.5% , which required a revaluation of the Company's existing investment to its implied fair value. This $11.4 million gain was partially offset by the Company's proportionate shares of net losses from unconsolidated entities of $1.0 million .

Supplemental Guarantor Financ42

Supplemental Guarantor Financial Information (Tables)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements	The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and June 30, 2017, supplemental condensed consolidating results of operations for the three months ended June 30, 2016 and 2017, and cash flow information for the six months ended June 30, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 $ — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 172 $ 3 $ 63,458 $ 17,776 $ — $ 81,409 Restricted cash — — 2,472 929 — 3,401 Accounts receivable — — 8,165 3,499 — 11,664 Prepaid domain name registry fees — — 30,961 25,812 (63 ) 56,710 Prepaid expenses & other current assets 14 57 19,230 9,543 — 28,844 Total current assets 186 60 124,286 57,559 (63 ) 182,028 Intercompany receivables, net 32,614 724,750 (615,827 ) (141,537 ) — — Property and equipment, net — — 80,599 14,026 — 94,625 Goodwill — — 1,685,981 175,627 — 1,861,608 Other intangible assets, net — — 528,901 16,089 — 544,990 Investment in subsidiaries 48,574 1,309,329 43,070 — (1,400,973 ) — Other assets — 4,323 22,629 6,276 — 33,228 Total assets $ 81,374 $ 2,038,462 $ 1,869,639 $ 128,040 $ (1,401,036 ) $ 2,716,479 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 11,040 $ 1,801 $ — $ 12,841 Accrued expenses and other current liabilities — 20,659 67,496 9,968 — 98,123 Deferred revenue — — 308,301 61,817 (293 ) 369,825 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 4,481 — — 4,481 Deferred consideration, short-term — — 4,250 — — 4,250 Total current liabilities — 54,604 395,568 73,586 (293 ) 523,465 Deferred revenue, long-term — — 80,693 10,563 — 91,256 Notes payable — 1,936,258 — — — 1,936,258 Capital lease obligations — — 1,537 — — 1,537 Deferred consideration — — 3,412 25 — 3,437 Other long-term liabilities — (974 ) 54,100 796 — 53,922 Total liabilities — 1,989,888 535,310 84,970 (293 ) 2,609,875 Redeemable non-controlling interest — — 25,000 — — 25,000 Equity 81,374 48,574 1,309,329 43,070 (1,400,743 ) 81,604 Total liabilities and equity $ 81,374 $ 2,038,462 $ 1,869,639 $ 128,040 $ (1,401,036 ) $ 2,716,479 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 257,712 $ 34,324 $ (1,323 ) $ 290,713 Cost of revenue — — 131,629 22,942 (1,494 ) 153,077 Gross profit — — 126,083 11,382 171 137,636 Operating expense: Sales and marketing — — 62,747 17,571 (9 ) 80,309 Engineering and development — — 20,883 6,804 — 27,687 General and administrative — 76 31,232 3,522 — 34,830 Transaction costs — — 999 (21 ) — 978 Total operating expense — 76 115,861 27,876 (9 ) 143,804 Income (loss) from operations — (76 ) 10,222 (16,494 ) 180 (6,168 ) Interest expense and other income, net — 39,985 863 4 — 40,852 Income (loss) before income taxes and equity earnings of unconsolidated entities — (40,061 ) 9,359 (16,498 ) 180 (47,020 ) Income tax expense (benefit) — (15,654 ) 2,697 (974 ) — (13,931 ) Loss before equity earnings of unconsolidated entities — (24,407 ) 6,662 (15,524 ) 180 (33,089 ) Equity loss of unconsolidated entities, net of tax 33,612 9,203 15,865 92 (58,431 ) 341 Net loss (33,612 ) (33,610 ) (9,203 ) (15,616 ) 58,611 (33,430 ) Net loss attributable to non-controlling interest — — (5,390 ) — — (5,390 ) Net loss attributable to Endurance International Group Holdings, Inc. $ (33,612 ) $ (33,610 ) $ (3,813 ) $ (15,616 ) $ 58,611 $ (28,040 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 540 — 540 Unrealized gain (loss) on cash flow hedge, net of taxes — (427 ) — — — (427 ) Total comprehensive loss $ (33,612 ) $ (34,037 ) $ (3,813 ) $ (15,076 ) $ 58,611 $ (27,927 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Six months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 461,781 $ 67,701 $ (1,656 ) $ 527,826 Cost of revenue — — 246,260 45,357 (2,064 ) 289,553 Gross profit — — 215,521 22,344 408 238,273 Operating expense: Sales and marketing — — 116,976 42,642 (15 ) 159,603 Engineering and development — — 33,781 10,161 — 43,942 General and administrative — 120 68,052 6,937 — 75,109 Transaction costs — — 32,098 — — 32,098 Total operating expense — 120 250,907 59,740 (15 ) 310,752 Income (loss) from operations — (120 ) (35,386 ) (37,396 ) 423 (72,479 ) Interest expense and other income, net — 69,341 (9,577 ) (85 ) — 59,679 Income (loss) before income taxes and equity earnings of unconsolidated entities — (69,461 ) (25,809 ) (37,311 ) 423 (132,158 ) Income tax expense (benefit) — (26,870 ) (86,437 ) (526 ) — (113,833 ) Loss before equity earnings of unconsolidated entities — (42,591 ) 60,628 (36,785 ) 423 (18,325 ) Equity loss of unconsolidated entities, net of tax 19,773 (22,820 ) 37,810 92 (33,831 ) 1,024 Net loss (19,773 ) (19,771 ) 22,818 (36,877 ) 34,254 (19,349 ) Net loss attributable to non-controlling interest — — (13,120 ) — — (13,120 ) Net loss attributable to Endurance International Group Holdings, Inc. $ (19,773 ) $ (19,771 ) $ 35,938 $ (36,877 ) $ 34,254 $ (6,229 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 882 — 882 Unrealized gain (loss) on cash flow hedge, net of taxes — (1,938 ) — — — (1,938 ) Total comprehensive loss $ (19,773 ) $ (21,709 ) $ 35,938 $ (35,995 ) $ 34,254 $ (7,285 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 259,725 $ 33,769 $ (1,236 ) $ 292,258 Cost of revenue — — 125,511 22,148 (1,076 ) 146,583 Gross profit — — 134,214 11,621 (160 ) 145,675 Operating expense: Sales and marketing — — 65,948 6,158 — 72,106 Engineering and development — — 18,351 1,798 — 20,149 General and administrative — 55 37,712 2,813 — 40,580 Transaction costs — — 193 — — 193 Total operating expense — 55 122,204 10,769 — 133,028 Income (loss) from operations — (55 ) 12,010 852 (160 ) 12,647 Interest expense and other income, net — 45,406 247 (180 ) — 45,473 Income (loss) before income taxes and equity earnings of unconsolidated entities — (45,461 ) 11,763 1,032 (160 ) (32,826 ) Income tax expense (benefit) — (16,794 ) 19,555 (133 ) — 2,628 Loss before equity earnings of unconsolidated entities — (28,667 ) (7,792 ) 1,165 (160 ) (35,454 ) Equity loss of unconsolidated entities, net of tax 35,256 6,589 (1,204 ) — (40,680 ) (39 ) Net loss (35,256 ) (35,256 ) (6,588 ) 1,165 40,520 (35,415 ) Net loss attributable to non-controlling interest — — 3,714 — — 3,714 Net loss attributable to Endurance International Group Holdings, Inc. $ (35,256 ) $ (35,256 ) $ (10,302 ) $ 1,165 $ 40,520 $ (39,129 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,228 — 1,228 Unrealized gain (loss) on cash flow hedge, net of taxes — (176 ) — — — (176 ) Total comprehensive loss $ (35,256 ) $ (35,432 ) $ (10,302 ) $ 2,393 $ 40,520 $ (38,077 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Six months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 521,821 $ 68,302 $ (2,728 ) $ 587,395 Cost of revenue — — 253,403 44,237 (2,308 ) 295,332 Gross profit — — 268,418 24,065 (420 ) 292,063 Operating expense: Sales and marketing — — 134,016 10,865 (3 ) 144,878 Engineering and development — — 33,641 6,870 — 40,511 General and administrative — 110 73,383 6,167 — 79,660 Transaction costs — — 773 — — 773 Total operating expense — 110 241,813 23,902 (3 ) 265,822 Income (loss) from operations — (110 ) 26,605 163 (417 ) 26,241 Interest expense and other income, net — 84,652 394 (175 ) — 84,871 Income (loss) before income taxes and equity earnings of unconsolidated entities — (84,762 ) 26,211 338 (417 ) (58,630 ) Income tax expense (benefit) — (31,311 ) 39,250 463 — 8,402 Loss before equity earnings of unconsolidated entities — (53,451 ) (13,039 ) (125 ) (417 ) (67,032 ) Equity loss of unconsolidated entities, net of tax 66,577 13,127 87 — (79,830 ) (39 ) Net loss (66,577 ) (66,578 ) (13,126 ) (125 ) 79,413 (66,993 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net loss attributable to Endurance International Group Holdings, Inc. $ (66,577 ) $ (66,578 ) $ (20,650 ) $ (125 ) $ 79,413 $ (74,517 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,914 — 1,914 Unrealized gain (loss) on cash flow hedge, net of taxes — (392 ) — — — (392 ) Total comprehensive loss $ (66,577 ) $ (66,970 ) $ (20,650 ) $ 1,789 $ 79,413 $ (72,995 ) Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ — $ (22,903 ) $ 108,768 $ (20,250 ) $ — $ 65,615 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (899,889 ) — — (899,889 ) Purchases of property and equipment — — (17,881 ) (3,080 ) — (20,961 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 252 — — 252 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (11 ) (16 ) — (27 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (421 ) — (768 ) Net cash used in investing activities — — (923,476 ) (3,517 ) — (926,993 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,072,178 — — — 1,072,178 Repayment of notes payable and revolver — (116,850 ) — — — (116,850 ) Payment of financing costs — (51,727 ) — — — (51,727 ) Payment of deferred consideration — — (37 ) (670 ) — (707 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (2,896 ) — — (2,896 ) Proceeds from exercise of stock options 1,328 — — — — 1,328 Capital investments from minority partner — — — 1,000 — 1,000 Intercompany loans and investments (1,332 ) (880,752 ) 854,910 27,174 — — Net cash provided by (used in) financing activities (4 ) 22,849 851,977 27,504 — 902,326 Net effect of exchange rate on cash and cash equivalents — — — 1,614 — 1,614 Net increase (decrease) in cash and cash equivalents (4 ) (54 ) 37,269 5,351 — 42,562 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 8 $ 13 $ 58,555 $ 17,016 $ — $ 75,592 Condensed Consolidating Statement of Cash Flows Six months ended June 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (14 ) $ (47,489 ) $ 126,047 $ 3,878 $ — $ 82,422 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — — — — — Purchases of property and equipment — — (17,020 ) (2,275 ) — (19,295 ) Cash paid for minority investments — — — — — — Proceeds from sale of property and equipment — — 287 — — 287 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (1,646 ) (34 ) — (1,680 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — 148 (248 ) — (100 ) Net cash used in investing activities — — (18,231 ) (2,557 ) — (20,788 ) Cash flows from financing activities: — Proceeds from issuance of term loan and notes, net of original issue discounts — 1,693,007 — — — 1,693,007 Repayment of term loans — (1,714,661 ) — — — (1,714,661 ) Payment of financing costs — (6,060 ) — — — (6,060 ) Payment of deferred consideration — — (4,550 ) (858 ) — (5,408 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (3,908 ) — — (3,908 ) Proceeds from exercise of stock options 1,132 — — — — 1,132 Capital investments from minority partner — — — — — — Intercompany loans and investments (949 ) 75,202 (74,934 ) 681 — — Net cash provided by (used in) financing activities 183 47,488 (83,392 ) (177 ) — (35,898 ) Net effect of exchange rate on cash and cash equivalents — — — 2,077 — 2,077 Net increase (decrease) in cash and cash equivalents 169 (1 ) 24,424 3,221 — 27,813 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 172 $ 3 $ 63,458 $ 17,776 $ — $ 81,409

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Jun. 30, 2017USD ($)Segment	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015Segment
Accounting Policies [Line Items]
Number of reportable segments | Segment				2		2	1
Software development cost capitalized	$ 3,300,000	$ 3,800,000		$ 6,200,000	$ 6,400,000
Goodwill impairment				0		$ 0
Goodwill	1,861,608,000			1,861,608,000		1,859,909,000
Impairment of long lived assets	0	(6,848,000)		$ 0	(8,285,000)
Contract service period				36 months
Reserves for refunds and chargebacks	500,000			$ 500,000		600,000
Deferred revenue expected to be refunded	2,100,000			$ 2,100,000		2,100,000
Percentage of deferred revenue refunded within same fiscal month				84.00%
Percentage of deferred revenue refunded within 45 days				95.00%
Unrecognized tax benefits	0	0		$ 0	0
Interest expense and penalties	0	0		0	0
Impairment of other long-lived assets	0	0		$ 0	0
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income						142,700,000
Amount of net operating loss carry-forwards available to offset future state taxable income						$ 125,600,000
Developed Technology
Accounting Policies [Line Items]
Weighted average useful life				7 years		7 years
Webzai Limited inc | Engineering and Development
Accounting Policies [Line Items]
Impairment of long lived assets			$ (1,400,000)	$ 0
Minimum
Accounting Policies [Line Items]
Discount rate						11.00%
Maximum
Accounting Policies [Line Items]
Discount rate						12.00%
Web Presence Unit
Accounting Policies [Line Items]
Goodwill	1,257,303,000			1,257,303,000		$ 1,255,604,000
Reporting unit, percentage of fair value in excess of carrying amount						67.00%
Impairment of long lived assets	0	(6,848,000)		0	(8,285,000)
Email Marketing Unit
Accounting Policies [Line Items]
Goodwill	604,305,000			604,305,000		$ 604,305,000
Reporting unit, percentage of fair value in excess of carrying amount						35.00%
Impairment of long lived assets	$ 0	$ 0		$ 0	$ 0
Accounting Standards Update 2016-09, Excess Tax Benefit Component
Accounting Policies [Line Items]
Excess tax benefit						$ 900,000
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income						1,500,000
Amount of net operating loss carry-forwards available to offset future state taxable income						700,000
Cumulative effect of new accounting principle in period of adoption						$ 900,000

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Software development cost capitalized	$ 3,300,000	$ 3,800,000	$ 6,200,000	$ 6,400,000
Impairment of other long-lived assets	$ 0	$ 0	$ 0	$ 0
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life			35 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life			2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life			3 years
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life			3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life			5 years

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Summary of Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
Net loss attributable to Endurance International Group	$ (39,129)	$ (28,040)	$ (74,517)	$ (6,229)
Net loss per share attributable to Endurance International Group Holdings, Inc.:
Basic net income (loss) per share (in usd per share)	$ (0.29)	$ (0.21)	$ (0.55)	$ (0.05)
Diluted net income (loss) per share (in usd per share)	$ (0.29)	$ (0.21)	$ (0.55)	$ (0.05)
Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	137,295,120	132,566,622	136,124,347	132,736,382
Weighted average number of diluted shares outstanding (in shares)	137,295,120	132,566,622	136,124,347	132,736,382

Summary of Significant Accoun46

Summary of Significant Accounting Policies - Summary Of Weighted Average Potentially Dilutive Shares Excluded From Calculation Of Diluted Loss Per Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	13,081,769	20,209,083	14,044,575	18,110,565
Restricted Stock Awards and Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	2,472,180	9,014,101	3,212,653	8,138,075
Stock Option Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	10,609,589	11,194,982	10,831,922	9,972,490

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 09, 2016	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 1,861,608	$ 1,859,909
Constant Contact, Inc.
Business Acquisition [Line Items]
Business acquisition price per share (in dollars per share)	$ 32
Enterprise value	$ 1,100,000
Goodwill	604,300
Property and equipment	39,600
Working capital	184,200
Deferred tax liability, net	125,100
Deferred revenue	25,200
Subscriber Relationships | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	263,000
Developed Technology | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	83,000
Trade-Names | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	$ 52,000

Acquisitions - Summary of Defer

Acquisitions - Summary of Deferred Consideration Related to Acquisition (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Deferred consideration, short-term	$ 4,250	$ 5,273
Deferred consideration, short-term	3,437	7,444
Mojoness Inc
Business Acquisition [Line Items]
Deferred consideration, short-term	0	818
Deferred consideration, short-term	0	0
Verio
Business Acquisition [Line Items]
Deferred consideration, short-term	0	50
Deferred consideration, short-term	0	0
Social Booster
Business Acquisition [Line Items]
Deferred consideration, short-term	25	40
Deferred consideration, short-term	0	25
AppMachine
Business Acquisition [Line Items]
Deferred consideration, short-term	4,225	4,365
Deferred consideration, short-term	$ 3,437	$ 7,419

Property and Equipment and Ca49

Property and Equipment and Capital Lease Obligations - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 266,228	$ 240,355
Less accumulated depreciation	(171,603)	(145,083)
Property and equipment—net	94,625	95,272
Land
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	790	790
Building
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	5,610	5,517
Software
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	61,699	52,130
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	156,603	143,091
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	10,846	10,892
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	21,559	21,244
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 9,121	$ 6,691

Property and Equipment and Ca50

Property and Equipment and Capital Lease Obligations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 14,051	$ 16,760	$ 27,162	$ 29,932
Capital lease included in software	24,200		24,200
Property under capital lease, net	$ 5,800		$ 5,800

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 818
Mojoness Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 800

Fair Value Measurements - Basis

Fair Value Measurements - Basis of Fair Value Measurements (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financial assets:
Interest rate cap (included in other assets)	$ 234	$ 979
Total financial assets	234	979
Financial liabilities:
Contingent earn-out consideration (included in deferred consideration)		818
Total financial liabilities		818
Significant Other Observable Inputs (Level 2)
Financial assets:
Interest rate cap (included in other assets)	234	979
Total financial assets	$ 234	979
Significant Unobservable Inputs (Level 3)
Financial liabilities:
Contingent earn-out consideration (included in deferred consideration)		818
Total financial liabilities		$ 818

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
December 31, 2016	$ 818
Payment of contingent earn-outs related to 2012 acquisition	(818)
Change in fair value of contingent earn-outs	0
June 30, 2017	$ 0

Derivatives And Hedging Activ54

Derivatives And Hedging Activities - Additional Information (Detail)	Dec. 09, 2015	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Agreement	Jun. 30, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cap period	3 years
Gain on interest rate cash flow hedge ineffectiveness				$ 0
Fair value of the interest rate contracts		$ 200,000		200,000
Tax expense (benefit) on gain (loss) recognized		(192,000)	$ (218,000)	(230,000)	$ (824,000)
Interest expense		45,658,000	$ 40,994,000	85,174,000	$ 71,365,000
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loss to be reclassified as increase to interest expense in the next twelve months		1,300,000		$ 1,300,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate cap agreements | Agreement				1
Notional amount outstanding		$ 500,000,000		$ 500,000,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Recognized loss				(400,000)
Tax expense (benefit) on gain (loss) recognized				(200,000)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense				$ 100,000

Goodwill and Other Intangible55

Goodwill and Other Intangible Assets - Changes in Goodwill Balances (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,859,909
Goodwill related to acquisitions	0
Foreign translation impact	1,699
Goodwill, ending balance	1,861,608
Web Presence Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	1,255,604
Goodwill related to acquisitions	0
Foreign translation impact	1,699
Goodwill, ending balance	1,257,303
Email Marketing Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	604,305
Goodwill related to acquisitions	0
Foreign translation impact	0
Goodwill, ending balance	$ 604,305

Goodwill and Other Intangible56

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,144,114	$ 1,141,824
Accumulated Amortization	599,124	529,767
Net Carrying Amount	544,990	612,057
Domains Names Available for Sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,258	29,954
Accumulated Amortization	5,895	4,976
Net Carrying Amount	$ 24,363	$ 24,978
Weighted average useful life	Indefinite	Indefinite
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 285,748	$ 284,005
Accumulated Amortization	128,654	111,348
Net Carrying Amount	$ 157,094	$ 172,657
Weighted average useful life	7 years	7 years
Subscriber Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 659,712	$ 659,662
Accumulated Amortization	387,464	345,070
Net Carrying Amount	$ 272,248	$ 314,592
Weighted average useful life	7 years	7 years
Trade-Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 133,804	$ 133,805
Accumulated Amortization	64,807	57,789
Net Carrying Amount	$ 68,997	$ 76,016
Weighted average useful life	8 years	8 years
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 34,278	$ 34,084
Accumulated Amortization	11,990	10,270
Net Carrying Amount	$ 22,288	$ 23,814
Weighted average useful life	13 years	13 years
Leasehold Interests
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 314	$ 314
Accumulated Amortization	314	314
Net Carrying Amount	$ 0	$ 0
Weighted average useful life	1 year	1 year

Goodwill and Other Intangible57

Goodwill and Other Intangible Assets - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Segment	Jun. 30, 2016USD ($)	Dec. 31, 2016Segment	Dec. 31, 2015Segment
Finite-Lived Intangible Assets [Line Items]
Number of reportable segments | Segment			2		2	1
Amortization of other intangible assets	$ 34,940,000	$ 37,823,000	$ 69,207,000	$ 67,697,000
IPR&D | Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment charge of intangible assets	$ 0		$ 0	1,400,000
Developed Technology | Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment of developed technology		$ 4,400,000		$ 4,400,000

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 27, 2016	May 31, 2014	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Apr. 08, 2016	Mar. 03, 2016	Jan. 06, 2016	Dec. 31, 2014	Aug. 31, 2014	Jan. 31, 2012
Schedule of Cost-method Investments [Line Items]
Investments			$ 15,846		$ 15,846		$ 15,857
Accounts payable			12,841		12,841		16,074
Convertible promissory note purchased									$ 600
Equity loss (income) of unconsolidated entities, net of tax			$ (39)	$ 341	$ (39)	$ 1,024
Proportionate share exceed of the company's consolidated assets or income			10.00%		10.00%
Bluezone Labs, LLC
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition													$ 300
Ownership interest													25.00%
Purchase of products and services			$ 400	$ 500
Accounts payable			200		$ 200		100
Prepaid expense			$ 900		$ 900		$ 0
WZ (UK) Ltd.
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition												$ 3,900
Ownership interest												49.00%
Ownership interest										57.50%
AppMachine
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition											$ 15,200
Ownership interest											40.00%
Remaining percentage of acquisition	60.00%
Fortifico Limited
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition								$ 5,000
Ownership interest							33.00%	33.00%
Impairment charges on remaining investments							$ 4,700
Minimum
Schedule of Cost-method Investments [Line Items]
Voting interest			20.00%		20.00%
Maximum
Schedule of Cost-method Investments [Line Items]
Voting interest			50.00%		50.00%
Automattic
Schedule of Cost-method Investments [Line Items]
Investment made on asset		$ 15,000
Percentage of outstanding shares invested		5.00%

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail) - USD ($)	Jun. 30, 2017	Jun. 14, 2017	Sep. 30, 2016	Feb. 28, 2016	Feb. 09, 2016	Nov. 30, 2013	Feb. 08, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Repayments of long-term debt										$ 1,714,661,000	$ 33,850,000
Line of credit facility, unused capacity, commitment fee percentage								0.50%	0.50%	0.50%	0.50%
Interest expense								$ 45,658,000	$ 40,994,000	$ 85,174,000	$ 71,365,000
Interest expense and service fees								36,165,000	37,512,000	72,820,000	65,508,000
Financing costs expensed								5,487,000	$ 0	5,487,000	$ 0
Minimum
Long-Term Debt [Line Items]
Debt instrument alternate base rate											7.50%
Maximum
Long-Term Debt [Line Items]
Debt instrument alternate base rate											8.50%
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Debt issue price				97.00%
Debt instrument revised LIBOR rate				5.00%
Reference rate				4.00%
Basis revised spread on LIBOR rate				1.00%
Basis spread on reference rate				2.00%
Repayments of long-term debt			$ 3,700,000					3,700,000
Extinguishment of debt		$ 716,600,000
Long-term line of credit					$ 735,000,000
Converted instrument, rate					1.00%
Amortization rate					0.50%
Incremental First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate				1.00%
Incremental First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate				0.50%
Revolving Credit Facility
Long-Term Debt [Line Items]
Revolving credit facility maximum borrowing amount	$ 165,000,000				$ 165,000,000	$ 125,000,000		165,000,000		165,000,000			$ 165,000,000
Line of credit facility, unused capacity, commitment fee percentage						0.50%
Commitment fee percentage					0.50%
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Original note balance		$ 1,697,300,000
Debt issue price		99.75%
Debt instrument revised LIBOR rate		4.00%
Reference rate		3.00%
Basis revised spread on LIBOR rate		1.00%
Basis spread on reference rate		2.00%
Repayments of long-term debt	8,500,000
Debt issuance costs, gross	4,200,000							4,200,000		4,200,000
Unamortized debt issuance expense	$ 900,000							900,000		900,000
2017 First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate		1.00%
2017 First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate		0.50%
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Original note balance						$ 1,050,000,000
Debt instrument revised LIBOR rate							4.00%
Reference rate							3.00%
Basis revised spread on LIBOR rate				5.48%	5.23%		1.00%
Basis revised spread on reference rate				4.48%	4.23%
Basis spread on reference rate							2.00%
Repayments of long-term debt										2,600,000
Voluntary prepayments										$ 2,600,000
Extinguishment of debt		$ 980,600,000
Interest expense and service fees								$ 1,000,000
2013 First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate							1.00%
Interest rate, effective percentage							5.00%
2013 First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate							0.50%
Alternate Base Rate Loans | Revolving Credit Facility
Long-Term Debt [Line Items]
Reference rate						5.25%
Basis revised spread on LIBOR rate					3.00%	1.00%
Basis spread on reference rate						2.50%
Alternate Base Rate Loans | Revolving Credit Facility | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate					0.50%	0.50%
LIBOR Based Interest Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Reference rate					4.00%	6.25%
Basis revised spread on LIBOR rate					0.00%
LIBOR Based Interest Rate Loan | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate						1.50%
Basis revised spread on LIBOR rate					1.00%
Senior Notes Due 2024
Long-Term Debt [Line Items]
Original note balance					$ 350,000,000
Redemption price, percentage										101.00%
Par value percentage					98.065%
Interest rate, stated percentage	10.875%				10.875%			10.875%	10.875%	10.875%	10.875%
Senior notes												$ 350,000,000

Notes Payable - Schedule of Lon

Notes Payable - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Total	$ 1,970,203	$ 1,986,980
Current maturities	(33,945)	(35,700)
Excluding current maturities	1,936,258	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Total	1,642,321	0
Current maturities	(33,945)
Excluding current maturities	1,608,376
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Total	0	985,640
Current maturities	0	(21,000)
Excluding current maturities	0	964,640
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Total	0	674,860
Current maturities	0	(14,700)
Excluding current maturities	0	660,160
Senior Notes Due 2024
Long-Term Debt [Line Items]
Total	327,882	326,480
Current maturities	0	0
Excluding current maturities	327,882	326,480
Revolving Credit Facilities
Long-Term Debt [Line Items]
Total	$ 0	$ 0

Notes Payable Notes Payable-Sch

Notes Payable Notes Payable-Schedule of 2017 First Lien Term Loan (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,038,764
Deferred financing costs	(40,622)	$ (43,342)
Total	1,970,203	1,986,980
Current maturities	(33,945)	(35,700)
Excluding current maturities	1,936,258	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	1,688,764
Unamortized deferred financing costs	(24,492)
Deferred financing costs	(21,951)
Total	1,642,321	$ 0
Current maturities	(33,945)
Excluding current maturities	$ 1,608,376

Notes Payable - Schedule of 201

Notes Payable - Schedule of 2013 First Term Lien Loan (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,038,764
Total	1,970,203	$ 1,986,980
Current maturities	(33,945)	(35,700)
Long-term debt, excluding current maturities	1,936,258	1,951,280
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	0	985,875
Unamortized deferred financing costs	0	(235)
Total	0	985,640
Current maturities	0	(21,000)
Long-term debt, excluding current maturities	$ 0	$ 964,640

Notes Payable - Schedule of Inc

Notes Payable - Schedule of Incremental First Lien Term Loan (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,038,764
Deferred financing costs	(40,622)	$ (43,342)
Total	1,970,203	1,986,980
Current maturities	(33,945)	(35,700)
Long-term debt, excluding current maturities	1,936,258	1,951,280
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	0	720,300
Unamortized deferred financing costs	0	(25,869)
Deferred financing costs	0	(19,571)
Total	0	674,860
Current maturities	0	(14,700)
Long-term debt, excluding current maturities	$ 0	$ 660,160

Notes Payable - Schedule of Sen

Notes Payable - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,038,764
Deferred financing costs	(40,622)	$ (43,342)
Total	1,970,203	1,986,980
Current maturities	(33,945)	(35,700)
Long-term debt, excluding current maturities	1,936,258	1,951,280
Senior Notes Due 2024
Long-Term Debt [Line Items]
Long-term debt, gross	350,000	350,000
Unamortized deferred financing costs	(16,130)	(17,238)
Deferred financing costs	(5,988)	(6,282)
Total	327,882	326,480
Current maturities	0	0
Long-term debt, excluding current maturities	$ 327,882	$ 326,480

Notes Payable - Summary of Futu

Notes Payable - Summary of Future Debt Maturities (Detail) $ in Thousands	Jun. 30, 2017USD ($)
Debt Disclosure [Abstract]
(Remainder of) 2017	$ 16,973
2,018	33,945
2,019	33,945
2,020	33,945
2,021	33,945
Thereafter	1,886,011
Total	$ 2,038,764

Notes Payable - Schedule of Int

Notes Payable - Schedule of Interest Rates and Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 09, 2016
Long-Term Debt [Line Items]
Line of credit facility, unused capacity, commitment fee percentage	0.50%	0.50%	0.50%	0.50%
Interest expense and service fees	$ 36,165	$ 37,512	$ 72,820	$ 65,508
Loss on early extinguishment of debt	992	0	992	0
Financing costs expensed	5,487	0	5,487	0
Amortization of deferred financing fees	1,786	1,651	3,530	2,562
Amortization of net present value of deferred consideration	187	799	377	1,582
Amortization of original issue discounts	886	823	1,732	1,272
Other interest expense	155	209	236	441
Interest expense	$ 45,658	$ 40,994	$ 85,174	$ 71,365
Senior Notes Due 2024
Long-Term Debt [Line Items]
Interest rate, stated percentage	10.875%	10.875%	10.875%	10.875%	10.875%
Minimum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate			5.14%	6.00%
Debt instrument alternate base rate				7.50%
Maximum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate			6.68%	7.75%
Debt instrument alternate base rate				8.50%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2017vote
Equity [Abstract]
Number of vote per share	1

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Stockholders' equity attributable to parent, beginning balance			$ 124,383
Stock-based compensation			28,357
Reclassification of stock-compensation liability award			450
Stock option exercises			1,132
Foreign currency translation adjustment	$ 1,228	$ 540	1,914	$ 882
Unrealized loss on derivative	(176)	(427)	(392)	(1,938)
Net (loss) income attributable to non-controlling interest	51	(5,390)	277	(13,120)
Net loss attributable to Endurance International Group	(39,129)	$ (28,040)	(74,517)	$ (6,229)
Stockholders' equity attributable to parent, ending balance	$ 81,604		$ 81,604

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 09, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share)		$ 0.0001		$ 0.0001			$ 0.0001
Stock-based compensation expense		$ 16,245	$ 15,024	$ 29,169	$ 33,412
2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		3,500		5,600
2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 0		$ 1,200
Chief Executive Officer | 2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting		154,146		0		3,693,754
Vested period of award shares		2 years 9 months				3 years
Chief Financial Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				223,214
Chief Operating Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				260,416
Chief Administrative Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				148,810
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future awards (in shares)		38,000,000		38,000,000
Shares available for grant (in shares)		14,728,500		14,728,500
Stock options, granted (in shares)				110,433
2013 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				160,428
Vesting period				4 years
2013 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				2,496,646
Vesting period				4 years
2011 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future awards (in shares)		10,000,000		10,000,000
Shares available for grant (in shares)		8,859,580		8,859,580
Common stock, par value (in usd per share)	$ 0.01
Stock options, granted (in shares)				14,724
Stock-based compensation expense				$ 22,300
2011 Stock Incentive Plan | Pre-Acquisition Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				5,400
2011 Stock Incentive Plan | Post-Acquisition Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 16,900
2011 Stock Incentive Plan | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, granted (in shares)	2,143,987
2011 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting	2,202,846			1,114,191
Vesting period				4 years

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Total Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 16,245	$ 15,024	$ 29,169	$ 33,412
2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	16,245	15,024	29,169	33,412
Cost of revenue | 2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	1,661	1,703	3,167	2,473
Sales and marketing | 2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	2,911	2,677	4,764	4,399
Engineering and development | 2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	1,728	1,441	2,899	2,205
General and administrative | 2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 9,945	$ 9,203	$ 18,339	$ 24,335

Stock-Based Compensation - Su71

Stock-Based Compensation - Summary of Stock Options (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)$ / sharesshares
2013 Stock Incentive Plan
Stock Options
Beginning balance stock options, outstanding (in shares) | shares	9,607,431
Stock options, granted (in shares) | shares	110,433
Stock options, exercised (in shares) | shares	0
Stock options, forfeited (in shares) | shares	(179,758)
Stock options, expired (in shares) | shares	(209,074)
Ending balance stock options, outstanding (in shares) | shares	9,329,032
Stock options, exercisable (in shares) | shares	5,875,021
Stock options, expected to vest after March 31, 2017 (in shares) | shares	3,454,011
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in shares) | shares	9,329,032
Weighted- Average Exercise Price
Weighted - average exercise price, outstanding (in usd per share)	$ 12.79
Weighted - average exercise price, granted (in usd per share)	8.15
Weighted - average exercise price, exercised (in usd per share)	0
Weighted - average exercise price, forfeited (in usd per share)	13.24
Weighted - average exercise price, expired (in usd per share)	13.68
Weighted - average exercise price, outstanding (in usd per share)	12.71
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	12.90
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	12.38
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 12.71
Weighted - average remaining contractual term, outstanding	7 years 4 months 8 days
Weighted - average remaining contractual term, exercisable at March 31, 2017	6 years 10 months 6 days
Weighted - average remaining contractual term, expected to vest after March 31, 2017	8 years 2 months 12 days
Weighted - average remaining contractual term, exercisable as of March 31, 2017 and expected to vest thereafter	7 years 4 months 8 days
Aggregate intrinsic value, outstanding | $	$ 63
Aggregate intrinsic value, exercisable at March 31, 2017 | $	0
Aggregate intrinsic value, expected to vest after March 31, 2017 | $	0
Aggregate intrinsic value, exercisable as of March 31, 2017 and expected to vest thereafter | $	$ 63
Estimated fair value of the Company's common stock (in usd per share)	$ 8.35
2011 Stock Incentive Plan
Stock Options
Beginning balance stock options, outstanding (in shares) | shares	1,931,830
Stock options, granted (in shares) | shares	14,724
Stock options, exercised (in shares) | shares	(196,167)
Stock options, forfeited (in shares) | shares	(333,361)
Stock options, expired (in shares) | shares	(17,097)
Ending balance stock options, outstanding (in shares) | shares	1,399,929
Stock options, exercisable (in shares) | shares	697,592
Stock options, expected to vest after March 31, 2017 (in shares) | shares	702,337
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in shares) | shares	1,399,929
Weighted- Average Exercise Price
Weighted - average exercise price, outstanding (in usd per share)	$ 8.73
Weighted - average exercise price, granted (in usd per share)	8.15
Weighted - average exercise price, exercised (in usd per share)	5.77
Weighted - average exercise price, forfeited (in usd per share)	9.99
Weighted - average exercise price, expired (in usd per share)	8.69
Weighted - average exercise price, outstanding (in usd per share)	8.83
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	8.31
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	9.35
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 8.83
Weighted - average remaining contractual term, outstanding	4 years 5 months 29 days
Weighted - average remaining contractual term, exercisable at March 31, 2017	3 years 7 months 17 days
Weighted - average remaining contractual term, expected to vest after March 31, 2017	5 years 5 months 9 days
Weighted - average remaining contractual term, exercisable as of March 31, 2017 and expected to vest thereafter	4 years 5 months 25 days
Aggregate intrinsic value, outstanding | $	$ 1,087
Aggregate intrinsic value, exercisable at March 31, 2017 | $	823
Aggregate intrinsic value, expected to vest after March 31, 2017 | $	264
Aggregate intrinsic value, exercisable as of March 31, 2017 and expected to vest thereafter | $	$ 1,087
Estimated fair value of the Company's common stock (in usd per share)	$ 8.35

Stock-Based Compensation - Su72

Stock-Based Compensation - Summary of Restricted Stock Awards and Restricted Stock Units (Detail) - $ / shares	Feb. 09, 2016	Jun. 30, 2017
Restricted Stock Awards | 2013 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in RSU's)		7,332,537
Granted (in RSU's)		160,428
Vested (in RSU's)		(1,867,736)
Canceled (in RSU's)		(87,421)
Non-vested, ending balance (in RSU's)		5,537,808
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 13.21
Weighted average grant date fair value, granted (in usd per share)		8.15
Weighted average grant date fair value, vested (in usd per share)		10.58
Weighted average grant date fair value, canceled (in usd per share)		12.78
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 13.95
Restricted Stock Units | 2011 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in RSU's)		1,473,655
Granted (in RSU's)	2,202,846	1,114,191
Vested (in RSU's)		(536,126)
Canceled (in RSU's)		(350,377)
Non-vested, ending balance (in RSU's)		1,701,343
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 9.25
Weighted average grant date fair value, granted (in usd per share)		7.85
Weighted average grant date fair value, vested (in usd per share)		7.30
Weighted average grant date fair value, canceled (in usd per share)		8.94
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 8.21
Restricted Stock Units | 2013 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in RSU's)		100,369
Granted (in RSU's)		2,496,646
Vested (in RSU's)		(188,511)
Canceled (in RSU's)		(45,464)
Non-vested, ending balance (in RSU's)		2,363,040
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 12
Weighted average grant date fair value, granted (in usd per share)		7.84
Weighted average grant date fair value, vested (in usd per share)		7.85
Weighted average grant date fair value, canceled (in usd per share)		7.85
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 7.91

Accumulated Other Comprehensi73

Accumulated Other Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	$ 124,383
Other comprehensive income (loss)	1,522
Stockholders' equity attributable to parent, ending balance	81,604
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(2,395)
Other comprehensive income (loss)	1,914
Stockholders' equity attributable to parent, ending balance	(481)
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(1,271)
Other comprehensive income (loss)	(392)
Stockholders' equity attributable to parent, ending balance	(1,663)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	(3,666)
Stockholders' equity attributable to parent, ending balance	$ (2,144)

Redeemable Non-Controlling In74

Redeemable Non-Controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 07, 2017	Aug. 14, 2016	Jul. 13, 2016	May 16, 2016	Jan. 06, 2016	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2017	Jul. 01, 2017	Jul. 14, 2016	Aug. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Accretion in excess of fair value							$ 3,700	$ 7,247
WZ (UK) Ltd.
Redeemable Noncontrolling Interest [Line Items]
Ownership interest				77.50%	57.50%					86.40%	49.00%
Ownership interest					57.50%
Cash paid for minority investments					$ 2,100
Redeemable non-controlling interest					10,800
Expected value upon exercise of put option					$ 30,000
Put option accretion period		24 months
Percentage of additional stake acquired				20.00%
Payments to acquire business			$ 18,000	$ 15,400
Pseudio Limited
Redeemable Noncontrolling Interest [Line Items]
Ownership interest			100.00%
Cash paid for minority investments						$ 1,500
Resume Labs Limited
Redeemable Noncontrolling Interest [Line Items]
Cash paid for minority investments						$ 1,500
Subsequent Event
Redeemable Noncontrolling Interest [Line Items]
Reduced accretion value									$ 14,200
Subsequent Event | WZ (UK) Ltd.
Redeemable Noncontrolling Interest [Line Items]
Payments to acquire business	$ 25,000

Redeemable Non-controlling In75

Redeemable Non-controlling Interest - Schedule of Change in Redeemable Non-controlling Interest (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance			$ 17,753
Accretion in excess of fair value	$ 3,663	$ 0	7,247	$ 0
Ending balance	$ 25,000		$ 25,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Mar. 11, 2015	Nov. 20, 2014	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would impact effective tax rate			$ 0			$ 0		$ 0
Increase (decrease) in valuation allowance				$ (900,000)			$ (74,400,000)
Income tax expense (benefit)			2,628,000	(13,931,000)		8,402,000	(113,833,000)
Deferred federal and state deferred tax expense (benefit)			1,700,000	(11,600,000)		5,300,000	(40,600,000)
Federal and state current income taxes			900,000	(600,000)		2,400,000	1,500,000
Deferred foreign income tax expense (benefit)			(800,000)	(1,500,000)		(1,000,000)	(2,200,000)
Provision for foreign tax			$ 800,000	$ 700,000		$ 1,700,000	1,800,000
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income								142,700,000
Amount of net operating loss carry-forwards available to offset future state taxable income								125,600,000
Loss carry-forwards available to future foreign taxable income								$ 96,800,000
Net operating loss carry-forwards annual limitations									$ 77,100,000
Common stock, shares issued (in shares)			137,503,270			137,503,270		134,793,857
Constant Contact, Inc.
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance					$ (73,600,000)
Follow-On Public Offering
Operating Loss Carryforwards [Line Items]
Common stock, shares issued (in shares)		13,000,000
Number of shares sold by the selling stockholders	12,000,000
Common stock, per share	$ 19
Over-Allotment Option
Operating Loss Carryforwards [Line Items]
Number of shares sold by the selling stockholders	1,800,000	1,950,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Deferred tax assets, capital loss carryforwards								$ 3,400,000
Tax credit carryforward								20,300,000
Federal And State
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance			$ 14,400,000					10,000,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax assets, capital loss carryforwards								1,400,000
Tax credit carryforward								12,200,000
India
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								2,500,000
CHINA
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								300,000
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								10,700,000
United Kingdom
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								81,100,000
ISRAEL
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								1,900,000
SINGAPORE
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income								$ 300,000
Research Tax Credit Carryforward | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance							$ (7,300,000)

Severance and Other Exit Cost77

Severance and Other Exit Costs - Additional Information (Detail)	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2017position	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)position	Dec. 31, 2016USD ($)
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred			$ 9,026,000
Accrued reserve		$ 5,357,000	5,357,000	$ 1,559,000
Payments for restructuring			5,228,000
Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge			1,071,000
Accrued reserve		7,588,000	7,588,000	9,020,000
Payments for restructuring			2,855,000
2014 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		0	$ 0
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			265
Severance costs incurred			$ 0
2016 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		200,000	200,000
Payments for restructuring		400,000	1,400,000
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	660
Severance costs incurred		4,400,000	8,900,000
2017 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		5,200,000	5,200,000
Payments for restructuring		3,000,000	3,700,000
2017 Restructuring Plan | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		600,000	600,000
Accrued reserve		600,000	600,000
Payments for restructuring		0	0
Constant Contact, Inc. | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	50
Email Marketing Unit | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred			3,686,000
Accrued reserve		2,149,000	2,149,000	926,000
Payments for restructuring			2,463,000
Email Marketing Unit | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		(600,000)	498,000
Accrued reserve		6,841,000	6,841,000	$ 8,747,000
Payments for restructuring		$ 1,200,000	$ 2,404,000

Severance and Other Exit Cost78

Severance and Other Exit Costs - Summary of Aggregate Activity Related to Company's Facilities Exit Costs Accrual and Severance Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 9,020
Facility adjustments		1,071
Sublease income received		352
Cash paid		(2,855)
Ending Balance	$ 7,588	7,588
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		1,559
Severance charges		9,026
Cash paid		(5,228)
Ending Balance	5,357	5,357
Web presence segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		273
Facility adjustments		573
Sublease income received		352
Cash paid		(451)
Ending Balance	747	747
Web presence segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		633
Severance charges		5,340
Cash paid		(2,765)
Ending Balance	3,208	3,208
Email marketing segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		8,747
Facility adjustments	(600)	498
Sublease income received		0
Cash paid	(1,200)	(2,404)
Ending Balance	6,841	6,841
Email marketing segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		926
Severance charges		3,686
Cash paid		(2,463)
Ending Balance	$ 2,149	$ 2,149

Severance and Other Exit Cost79

Severance and Other Exit Costs - Summary of Total Restructuring Charges Recorded in the Consolidated Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 4,468	$ 5,663	$ 10,095	$ 17,265
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	700	2,137	3,443	5,602
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	875	1,267	2,249	5,168
Engineering and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	426	1,224	1,078	3,242
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 2,467	$ 1,035	$ 3,325	$ 3,253

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Jul. 06, 2017patentclaim	Aug. 07, 2015defendant	Aug. 31, 2012patentdefendant	Feb. 29, 2016USD ($)
Loss Contingencies [Line Items]
Minimum revenue requirement from single customer per year | $				$ 500
Constant Contact, Inc. | McGee Vs Constant Contact
Loss Contingencies [Line Items]
Number of defendants | defendant		2
Constant Contact, Inc. | RPost Holdings
Loss Contingencies [Line Items]
Number of defendants | defendant			5
Number of patents allegedly infringed | patent			5
Subsequent Event | Constant Contact, Inc. | RPost Holdings
Loss Contingencies [Line Items]
Number of pending claims | claim	1
Number of patents allegedly infringed | patent	1

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 09, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Prepaid expenses and other current assets		$ 28,844		$ 28,844		$ 28,678
Amount included in accounts receivable		11,664		11,664		13,088
Interest rate cap period	3 years
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense		2,100		2,100		1,300
Related party transaction expense		3,750	$ 3,700	7,250	$ 7,300
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense		1,300		1,300		1,100
Prepaid expenses and other current assets		200		200		200
Amount included in accounts receivable		600		600		$ 600
Related party transaction expense		$ 1,225	$ 1,400	$ 2,525	$ 3,100
Goldman, Sachs & Co.
Related Party Transaction [Line Items]
Related party transaction expense	$ 500
Interest rate cap period	3 years

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Revenue	$ (292,258)	$ (290,713)	$ (587,395)	$ (527,826)
Sales and marketing	72,106	80,309	144,878	159,603
Engineering and development	20,149	27,687	40,511	43,942
General and administrative	40,580	34,830	79,660	75,109
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Cost of revenue	3,100	3,300	6,000	6,400
Sales and marketing	400	100	500	200
Engineering and development	200	300	650	600
General and administrative	50	0	100	100
Total related party transaction expense, net	3,750	3,700	7,250	7,300
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Revenue	(900)	(700)	(2,000)	(1,300)
Revenue (contra)	1,950	2,000	4,150	4,100
Total related party transaction impact to revenue	1,050	1,300	2,150	2,800
Cost of revenue	175	100	375	300
Total related party transaction expense, net	$ 1,225	$ 1,400	$ 2,525	$ 3,100

Segment Information - Additiona

Segment Information - Additional Information (Details) - Segment	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Number of reportable segments	2	2	1

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Jul. 14, 2016	May 16, 2016	Jan. 06, 2016	Aug. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 292,258	$ 290,713	$ 587,395	$ 527,826
Gross profit	145,675	137,636	292,063	238,273
Net loss	(35,415)	(33,430)	(66,993)	(19,349)
Interest expense, net	45,473	40,852	84,871	71,089
Income tax expense (benefit)	2,628	(13,931)	8,402	(113,833)
Depreciation	14,051	16,760	27,162	29,932
Amortization of other intangible assets	34,940	37,823	69,207	67,697
Stock-based compensation	16,245	15,024	29,169	33,412
Restructuring expenses	4,468	5,663	10,096	17,265
Transaction expenses and charges	193	978	773	32,098
Gain of unconsolidated entities	(39)	341	(39)	(10,386)
Impairment of other long lived assets	0	6,848	0	8,285
Adjusted EBITDA	82,544	76,928	162,648	116,210
Total assets	2,716,479		2,716,479		$ 2,756,274
Financing costs expensed	5,487	0	5,487	0
Gain (loss) on extinguishment of debt including debt issuance costs	(6,500)		(6,500)
Other income				11,400
Loss of unconsolidated entities	(39)	341	(39)	1,024
Web Presence Unit
Segment Reporting Information [Line Items]
Revenue	193,172	196,041	390,520	394,089
Gross profit	82,552	86,666	169,168	176,551
Net loss	(33,139)	(17,461)	(56,766)	22,673
Interest expense, net	20,294	18,077	37,173	35,093
Income tax expense (benefit)	3,995	(4,341)	14,544	(88,598)
Depreciation	10,525	9,098	19,763	18,075
Amortization of other intangible assets	16,375	19,768	32,280	39,523
Stock-based compensation	14,345	10,429	25,445	25,075
Restructuring expenses	3,699	789	6,036	960
Transaction expenses and charges	0	757	0	31,114
Gain of unconsolidated entities	(39)	341	(39)	(10,386)
Impairment of other long lived assets	0	6,848	0	8,285
Adjusted EBITDA	36,055	44,305	78,436	81,814
Total assets	1,512,346		1,512,346		1,507,977
Email Marketing Unit
Segment Reporting Information [Line Items]
Revenue	99,086	94,672	196,875	133,737
Gross profit	63,123	50,970	122,895	61,722
Net loss	(2,276)	(15,969)	(10,227)	(42,022)
Interest expense, net	25,179	22,775	47,698	35,996
Income tax expense (benefit)	(1,367)	(9,590)	(6,142)	(25,235)
Depreciation	3,526	7,662	7,399	11,857
Amortization of other intangible assets	18,565	18,055	36,927	28,174
Stock-based compensation	1,900	4,595	3,724	8,337
Restructuring expenses	769	4,874	4,060	16,305
Transaction expenses and charges	193	221	773	984
Gain of unconsolidated entities	0	0	0	0
Impairment of other long lived assets	0	0	0	0
Adjusted EBITDA	46,489	$ 32,623	84,212	$ 34,396
Total assets	$ 1,204,133		$ 1,204,133		$ 1,248,297
WZ (UK) Ltd.
Segment Reporting Information [Line Items]
Ownership interest						86.40%	77.50%	57.50%	49.00%

Supplemental Guarantor Financ85

Supplemental Guarantor Financial Information - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2016USD ($)guarantor	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Feb. 29, 2016USD ($)
Guarantor Obligations [Line Items]
Number of guarantors sold | guarantor	2
Proceeds from sale of assets		$ 0	$ 0
Notes
Guarantor Obligations [Line Items]
Senior notes				$ 350,000
Interest rate, stated percentage				10.875%
CardStar | Guarantor Subsidiaries
Guarantor Obligations [Line Items]
Proceeds from sale of assets	$ 100

Supplemental Guarantor Financ86

Supplemental Guarantor Financial Information - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 81,409	$ 53,596	$ 75,592	$ 33,030
Restricted cash	3,401	3,302
Accounts receivable	11,664	13,088
Prepaid domain name registry fees	56,710	55,444
Prepaid expenses and other current assets	28,844	28,678
Total current assets	182,028	154,108
Intercompany receivables, net	0	0
Property and equipment—net	94,625	95,272
Goodwill	1,861,608	1,859,909
Other intangible assets—net	544,990	612,057
Investment in subsidiaries	0	0
Other assets	33,228	34,928
Total assets	2,716,479	2,756,274
Current liabilities:
Accounts payable	12,841	16,074
Accrued expenses and other current liabilities	98,123	97,858
Deferred revenue	369,825	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	4,481	6,690
Deferred consideration, short-term	4,250	5,273
Total current liabilities	523,465	516,785
Long-term deferred revenue	91,256	89,200
Notes payable	1,936,258	1,951,280
Capital lease obligations—long term	1,537	512
Deferred consideration, short-term	3,437	7,444
Other long-term liabilities	53,922	48,917
Total liabilities	2,609,875	2,614,138
Redeemable non-controlling interest	25,000	17,753
Equity	81,604	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,716,479	2,756,274
Reportable Legal Entities | Parent
Current assets:
Cash and cash equivalents	172	3	8	12
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	14	0
Total current assets	186	3
Intercompany receivables, net	32,614	31,665
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	48,574	92,068
Other assets	0	0
Total assets	81,374	123,736
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	0	0
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	0	0
Long-term deferred revenue	0	0
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration, short-term	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Redeemable non-controlling interest	0	0
Equity	81,374	123,736
Total liabilities, redeemable non-controlling interest and stockholders’ equity	81,374	123,736
Reportable Legal Entities | Issuer
Current assets:
Cash and cash equivalents	3	4	13	67
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	57	81
Total current assets	60	85
Intercompany receivables, net	724,750	799,953
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	1,309,329	1,299,562
Other assets	4,323	5,911
Total assets	2,038,462	2,105,511
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	20,659	27,208
Deferred revenue	0	0
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	54,604	62,908
Long-term deferred revenue	0	0
Notes payable	1,936,258	1,951,280
Capital lease obligations—long term	0	0
Deferred consideration, short-term	0	0
Other long-term liabilities	(974)	(745)
Total liabilities	1,989,888	2,013,443
Redeemable non-controlling interest	0	0
Equity	48,574	92,068
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,038,462	2,105,511
Reportable Legal Entities | Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	63,458	39,034	58,555	21,286
Restricted cash	2,472	2,620
Accounts receivable	8,165	10,148
Prepaid domain name registry fees	30,961	31,044
Prepaid expenses and other current assets	19,230	17,996
Total current assets	124,286	100,842
Intercompany receivables, net	(615,827)	(690,761)
Property and equipment—net	80,599	82,901
Goodwill	1,685,981	1,683,121
Other intangible assets—net	528,901	592,095
Investment in subsidiaries	43,070	40,651
Other assets	22,629	23,153
Total assets	1,869,639	1,832,002
Current liabilities:
Accounts payable	11,040	13,801
Accrued expenses and other current liabilities	67,496	60,760
Deferred revenue	308,301	295,208
Current portion of notes payable	0	0
Current portion of capital lease obligations	4,481	6,690
Deferred consideration, short-term	4,250	4,415
Total current liabilities	395,568	380,874
Long-term deferred revenue	80,693	77,649
Notes payable	0	0
Capital lease obligations—long term	1,537	512
Deferred consideration, short-term	3,412	7,419
Other long-term liabilities	54,100	48,233
Total liabilities	535,310	514,687
Redeemable non-controlling interest	25,000	17,753
Equity	1,309,329	1,299,562
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,869,639	1,832,002
Reportable Legal Entities | Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	17,776	14,555	17,016	11,665
Restricted cash	929	682
Accounts receivable	3,499	2,940
Prepaid domain name registry fees	25,812	24,697
Prepaid expenses and other current assets	9,543	10,601
Total current assets	57,559	53,475
Intercompany receivables, net	(141,537)	(140,857)
Property and equipment—net	14,026	12,371
Goodwill	175,627	176,788
Other intangible assets—net	16,089	19,962
Investment in subsidiaries	0	0
Other assets	6,276	5,864
Total assets	128,040	127,603
Current liabilities:
Accounts payable	1,801	2,273
Accrued expenses and other current liabilities	9,968	9,890
Deferred revenue	61,817	60,925
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	858
Total current liabilities	73,586	73,946
Long-term deferred revenue	10,563	11,551
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration, short-term	25	25
Other long-term liabilities	796	1,429
Total liabilities	84,970	86,951
Redeemable non-controlling interest	0	0
Equity	43,070	40,652
Total liabilities, redeemable non-controlling interest and stockholders’ equity	128,040	127,603
Eliminations
Current assets:
Cash and cash equivalents	0	0	$ 0	$ 0
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	(63)	(297)
Prepaid expenses and other current assets	0	0
Total current assets	(63)	(297)
Intercompany receivables, net	0	0
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	(1,400,973)	(1,432,281)
Other assets	0	0
Total assets	(1,401,036)	(1,432,578)
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	(293)	(943)
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	(293)	(943)
Long-term deferred revenue	0	0
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration, short-term	0	0
Other long-term liabilities	0	0
Total liabilities	(293)	(943)
Redeemable non-controlling interest	0	0
Equity	(1,400,743)	(1,431,635)
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ (1,401,036)	$ (1,432,578)

Supplemental Guarantor Financ87

Supplemental Guarantor Financial Information - Consolidated Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 292,258	$ 290,713	$ 587,395	$ 527,826
Cost of revenue	146,583	153,077	295,332	289,553
Gross profit	145,675	137,636	292,063	238,273
Operating expense:
Sales and marketing	72,106	80,309	144,878	159,603
Engineering and development	20,149	27,687	40,511	43,942
General and administrative	40,580	34,830	79,660	75,109
Transactions expenses	193	978	773	32,098
Total operating expense	133,028	143,804	265,822	310,752
Income (loss) from operations	12,647	(6,168)	26,241	(72,479)
Interest expense and other income, net	45,473	40,852	84,871	59,679
Loss before income taxes and equity earnings of unconsolidated entities	(32,826)	(47,020)	(58,630)	(132,158)
Income tax expense (benefit)	2,628	(13,931)	8,402	(113,833)
Loss before equity earnings of unconsolidated entities	(35,454)	(33,089)	(67,032)	(18,325)
Equity loss (income) of unconsolidated entities, net of tax	(39)	341	(39)	1,024
Net loss	(35,415)	(33,430)	(66,993)	(19,349)
Net loss attributable to non-controlling interest	3,714	(5,390)	7,524	(13,120)
Net loss attributable to Endurance International Group Holdings, Inc.	(39,129)	(28,040)	(74,517)	(6,229)
Comprehensive income (loss):
Foreign currency translation adjustment	1,228	540	1,914	882
Unrealized loss on derivative	(176)	(427)	(392)	(1,938)
Total comprehensive loss	(38,077)	(27,927)	(72,995)	(7,285)
Eliminations
Income Statement [Abstract]
Revenue	(1,236)	(1,323)	(2,728)	(1,656)
Cost of revenue	(1,076)	(1,494)	(2,308)	(2,064)
Gross profit	(160)	171	(420)	408
Operating expense:
Sales and marketing	0	(9)	(3)	(15)
Engineering and development	0	0	0	0
General and administrative	0	0	0	0
Transactions expenses	0	0	0	0
Total operating expense	0	(9)	(3)	(15)
Income (loss) from operations	(160)	180	(417)	423
Interest expense and other income, net	0	0	0	0
Loss before income taxes and equity earnings of unconsolidated entities	(160)	180	(417)	423
Income tax expense (benefit)	0	0	0	0
Loss before equity earnings of unconsolidated entities	(160)	180	(417)	423
Equity loss (income) of unconsolidated entities, net of tax	(40,680)	(58,431)	(79,830)	(33,831)
Net loss	40,520	58,611	79,413	34,254
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	40,520	58,611	79,413	34,254
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive loss	40,520	58,611	79,413	34,254
Parent Company | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0	0	0
Cost of revenue	0	0	0	0
Gross profit	0	0	0	0
Operating expense:
Sales and marketing	0	0	0	0
Engineering and development	0	0	0	0
General and administrative	0	0	0	0
Transactions expenses	0	0	0	0
Total operating expense	0	0	0	0
Income (loss) from operations	0	0	0	0
Interest expense and other income, net	0	0	0	0
Loss before income taxes and equity earnings of unconsolidated entities	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Loss before equity earnings of unconsolidated entities	0	0	0	0
Equity loss (income) of unconsolidated entities, net of tax	35,256	33,612	66,577	19,773
Net loss	(35,256)	(33,612)	(66,577)	(19,773)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	(35,256)	(33,612)	(66,577)	(19,773)
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive loss	(35,256)	(33,612)	(66,577)	(19,773)
Issuer | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0	0	0
Cost of revenue	0	0	0	0
Gross profit	0	0	0	0
Operating expense:
Sales and marketing	0	0	0	0
Engineering and development	0	0	0	0
General and administrative	55	76	110	120
Transactions expenses	0	0	0	0
Total operating expense	55	76	110	120
Income (loss) from operations	(55)	(76)	(110)	(120)
Interest expense and other income, net	45,406	39,985	84,652	69,341
Loss before income taxes and equity earnings of unconsolidated entities	(45,461)	(40,061)	(84,762)	(69,461)
Income tax expense (benefit)	(16,794)	(15,654)	(31,311)	(26,870)
Loss before equity earnings of unconsolidated entities	(28,667)	(24,407)	(53,451)	(42,591)
Equity loss (income) of unconsolidated entities, net of tax	6,589	9,203	13,127	(22,820)
Net loss	(35,256)	(33,610)	(66,578)	(19,771)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	(35,256)	(33,610)	(66,578)	(19,771)
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	(176)	(427)	(392)	(1,938)
Total comprehensive loss	(35,432)	(34,037)	(66,970)	(21,709)
Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	259,725	257,712	521,821	461,781
Cost of revenue	125,511	131,629	253,403	246,260
Gross profit	134,214	126,083	268,418	215,521
Operating expense:
Sales and marketing	65,948	62,747	134,016	116,976
Engineering and development	18,351	20,883	33,641	33,781
General and administrative	37,712	31,232	73,383	68,052
Transactions expenses	193	999	773	32,098
Total operating expense	122,204	115,861	241,813	250,907
Income (loss) from operations	12,010	10,222	26,605	(35,386)
Interest expense and other income, net	247	863	394	(9,577)
Loss before income taxes and equity earnings of unconsolidated entities	11,763	9,359	26,211	(25,809)
Income tax expense (benefit)	19,555	2,697	39,250	(86,437)
Loss before equity earnings of unconsolidated entities	(7,792)	6,662	(13,039)	60,628
Equity loss (income) of unconsolidated entities, net of tax	(1,204)	15,865	87	37,810
Net loss	(6,588)	(9,203)	(13,126)	22,818
Net loss attributable to non-controlling interest	3,714	(5,390)	7,524	(13,120)
Net loss attributable to Endurance International Group Holdings, Inc.	(10,302)	(3,813)	(20,650)	35,938
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive loss	(10,302)	(3,813)	(20,650)	35,938
Non-Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	33,769	34,324	68,302	67,701
Cost of revenue	22,148	22,942	44,237	45,357
Gross profit	11,621	11,382	24,065	22,344
Operating expense:
Sales and marketing	6,158	17,571	10,865	42,642
Engineering and development	1,798	6,804	6,870	10,161
General and administrative	2,813	3,522	6,167	6,937
Transactions expenses	0	(21)	0	0
Total operating expense	10,769	27,876	23,902	59,740
Income (loss) from operations	852	(16,494)	163	(37,396)
Interest expense and other income, net	(180)	4	(175)	(85)
Loss before income taxes and equity earnings of unconsolidated entities	1,032	(16,498)	338	(37,311)
Income tax expense (benefit)	(133)	(974)	463	(526)
Loss before equity earnings of unconsolidated entities	1,165	(15,524)	(125)	(36,785)
Equity loss (income) of unconsolidated entities, net of tax	0	92	0	92
Net loss	1,165	(15,616)	(125)	(36,877)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	1,165	(15,616)	(125)	(36,877)
Comprehensive income (loss):
Foreign currency translation adjustment	1,228	540	1,914	882
Unrealized loss on derivative	0	0	0	0
Total comprehensive loss	$ 2,393	$ (15,076)	$ 1,789	$ (35,995)

Supplemental Guarantor Financ88

Supplemental Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 82,422	$ 65,615
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(899,889)
Cash paid for minority investments	0	(5,600)
Purchases of property and equipment	(19,295)	(20,961)
Proceeds from sale of property and equipment	287	252
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	(1,680)	(27)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	(100)	(768)
Net cash used in investing activities	(20,788)	(926,993)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	1,693,007	1,072,178
Repayment of notes payable and revolver	(1,714,661)	(116,850)
Payment of financing costs	(6,060)	(51,727)
Payment of deferred consideration	(5,408)	(707)
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	(3,908)	(2,896)
Proceeds from exercise of stock options	1,132	1,328
Capital investments from minority partner	0	1,000
Intercompany loans and investments	0	0
Net cash provided by (used in) financing activities	(35,898)	902,326
Net effect of exchange rate on cash and cash equivalents	2,077	1,614
Net increase in cash and cash equivalents	27,813	42,562
Cash and cash equivalents:
Beginning of period	53,596	33,030
End of period	81,409	75,592
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	0
Cash paid for minority investments	0	0
Purchases of property and equipment	0	0
Proceeds from sale of property and equipment	0	0
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	0	0
Repayment of notes payable and revolver	0	0
Payment of financing costs	0	0
Payment of deferred consideration	0	0
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	0	0
Proceeds from exercise of stock options	0	0
Capital investments from minority partner	0	0
Intercompany loans and investments	0	0
Net cash provided by (used in) financing activities	0	0
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents:
Beginning of period	0	0
End of period	0	0
Parent Company | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(14)	0
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	0
Cash paid for minority investments	0	0
Purchases of property and equipment	0	0
Proceeds from sale of property and equipment	0	0
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	0	0
Repayment of notes payable and revolver	0	0
Payment of financing costs	0	0
Payment of deferred consideration	0	0
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	0	0
Proceeds from exercise of stock options	1,132	1,328
Capital investments from minority partner	0	0
Intercompany loans and investments	(949)	(1,332)
Net cash provided by (used in) financing activities	183	(4)
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	169	(4)
Cash and cash equivalents:
Beginning of period	3	12
End of period	172	8
Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(47,489)	(22,903)
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	0
Cash paid for minority investments	0	0
Purchases of property and equipment	0	0
Proceeds from sale of property and equipment	0	0
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	1,693,007	1,072,178
Repayment of notes payable and revolver	(1,714,661)	(116,850)
Payment of financing costs	(6,060)	(51,727)
Payment of deferred consideration	0	0
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	0	0
Proceeds from exercise of stock options	0	0
Capital investments from minority partner	0	0
Intercompany loans and investments	75,202	(880,752)
Net cash provided by (used in) financing activities	47,488	22,849
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	(1)	(54)
Cash and cash equivalents:
Beginning of period	4	67
End of period	3	13
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	126,047	108,768
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(899,889)
Cash paid for minority investments	0	(5,600)
Purchases of property and equipment	(17,020)	(17,881)
Proceeds from sale of property and equipment	287	252
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	(1,646)	(11)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	148	(347)
Net cash used in investing activities	(18,231)	(923,476)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	0	0
Repayment of notes payable and revolver	0	0
Payment of financing costs	0	0
Payment of deferred consideration	(4,550)	(37)
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	(3,908)	(2,896)
Proceeds from exercise of stock options	0	0
Capital investments from minority partner	0	0
Intercompany loans and investments	(74,934)	854,910
Net cash provided by (used in) financing activities	(83,392)	851,977
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	24,424	37,269
Cash and cash equivalents:
Beginning of period	39,034	21,286
End of period	63,458	58,555
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	3,878	(20,250)
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	0
Cash paid for minority investments	0	0
Purchases of property and equipment	(2,275)	(3,080)
Proceeds from sale of property and equipment	0	0
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	(34)	(16)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	(248)	(421)
Net cash used in investing activities	(2,557)	(3,517)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	0	0
Repayment of notes payable and revolver	0	0
Payment of financing costs	0	0
Payment of deferred consideration	(858)	(670)
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	0	0
Proceeds from exercise of stock options	0	0
Capital investments from minority partner	0	1,000
Intercompany loans and investments	681	27,174
Net cash provided by (used in) financing activities	(177)	27,504
Net effect of exchange rate on cash and cash equivalents	2,077	1,614
Net increase in cash and cash equivalents	3,221	5,351
Cash and cash equivalents:
Beginning of period	14,555	11,665
End of period	$ 17,776	$ 17,016