Endurance International 10-Q 9 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
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		142,706,250

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 68,970	$ 53,596
Restricted cash	3,645	3,302
Accounts receivable	10,717	13,088
Prepaid domain name registry fees	56,833	55,444
Prepaid expenses and other current assets	33,348	28,678
Total current assets	173,513	154,108
Property and equipment—net	93,463	95,272
Goodwill	1,860,291	1,859,909
Other intangible assets—net	578,023	612,057
Deferred financing costs	4,518	4,932
Investments	15,857	15,857
Prepaid domain name registry fees, net of current portion	10,746	10,429
Other assets	2,856	3,710
Total assets	2,739,267	2,756,274
Current liabilities:
Accounts payable	15,817	16,074
Accrued expenses	67,195	67,722
Accrued interest	17,429	27,246
Deferred revenue	369,240	355,190
Current portion of notes payable	35,700	35,700
Current portion of capital lease obligations	5,165	6,690
Deferred consideration—short term	4,525	5,273
Other current liabilities	3,149	2,890
Total current liabilities	518,220	516,785
Long-term deferred revenue	91,239	89,200
Notes payable—long term, net of original issue discounts of $25,853 and $25,006 and deferred financing costs of $43,342 and $42,012 respectively	1,944,532	1,951,280
Capital lease obligations—long term	0	512
Deferred tax liability	43,344	39,943
Deferred consideration—long term	7,564	7,444
Other liabilities	9,741	8,974
Total liabilities	2,614,640	2,614,138
Redeemable non-controlling interest	21,337	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 135,789,327 shares issued at December 31, 2016 and March 31, 2017, respectively; 134,793,857 and 135,789,327 outstanding at December 31, 2016 and March 31, 2017, respectively	14	14
Additional paid-in capital	882,052	868,228
Accumulated other comprehensive loss	(3,196)	(3,666)
Accumulated deficit	(775,580)	(740,193)
Total stockholders’ equity	103,290	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ 2,739,267	$ 2,756,274

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Notes payable-long term original issue discounts, net	$ 25,006	$ 25,853
Deferred financing costs	$ 42,012	$ 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)	135,789,327	134,793,857
Common stock, shares outstanding (in shares)	135,789,327	134,793,857

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 295,137	$ 237,113
Cost of revenue	148,749	136,476
Gross profit	146,388	100,637
Operating expense:
Sales and marketing	72,772	79,294
Engineering and development	20,362	16,255
General and administrative	39,080	40,279
Transactions expenses	580	31,120
Total operating expense	132,794	166,948
Income (loss) from operations	13,594	(66,311)
Other income (expense):
Other income	0	11,410
Interest income	118	134
Interest expense	(39,516)	(30,371)
Total other expense—net	(39,398)	(18,827)
Loss before income taxes and equity earnings of unconsolidated entities	(25,804)	(85,138)
Income tax expense (benefit)	5,774	(99,902)
Income (loss) before equity earnings of unconsolidated entities	(31,578)	14,764
Equity loss of unconsolidated entities, net of tax	0	683
Net income (loss)	(31,578)	14,081
Net (loss) income attributable to non-controlling interest	226	(7,730)
Excess accretion of non-controlling interest	3,584	0
Total net (loss) income attributable to non-controlling interest	3,810	(7,730)
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(35,388)	21,811
Comprehensive income (loss):
Foreign currency translation adjustments	686	342
Unrealized loss on cash flow hedge, net of taxes of $606 and $38, for the three months ended March 31, 2016 and 2017, respectively	(216)	(1,511)
Total comprehensive loss	$ (34,918)	$ 20,642
Basic net income (loss) per share (in usd per share)	$ (0.26)	$ 0.17
Diluted net income (loss) per share (in usd per share)	$ (0.26)	$ 0.16
Weighted-average common shares used in computing net income (loss) per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	134,935,153	132,178,693
Weighted average number of diluted shares outstanding (in shares)	134,935,153	133,563,884

Consolidated Statements of Ope5

Consolidated Statements of Operations and Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Unrealized gain (loss) arising during period, tax	$ 38	$ 606

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ (31,578)	$ 14,081
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property and equipment	13,111	13,172
Amortization of other intangible assets	34,267	29,874
Impairment of long lived assets	0	1,437
Amortization of deferred financing costs	1,744	911
Amortization of net present value of deferred consideration	190	783
Amortization of original issue discounts	846	449
Stock-based compensation	12,924	18,388
Deferred tax (benefit) expense	3,440	(103,203)
Gain on sale of assets	(225)	(1)
Gain from unconsolidated entities	0	(11,410)
Loss of unconsolidated entities	0	683
(Gain) loss from change in deferred consideration	0	21
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	2,393	2,144
Prepaid expenses and other current assets	(5,717)	(15,673)
Accounts payable and accrued expenses	(13,467)	16,973
Deferred revenue	15,747	43,143
Net cash provided by operating activities	33,675	11,772
Cash flows from investing activities:
Businesses acquired in purchase transactions, net of cash acquired	0	(881,709)
Cash paid for minority investment	0	(600)
Purchases of property and equipment	(9,258)	(10,140)
Proceeds from sale of assets	251	0
Purchases of intangible assets	(33)	0
Withdrawals of principal balances in restricted cash accounts	(344)	(737)
Net cash used in investing activities	(9,384)	(893,186)
Cash flows from financing activities:
Proceeds from issuance of term loan and notes, net of original issue discounts	0	1,056,178
Repayments of term loans	(8,925)	(8,925)
Proceeds from borrowing of revolver	0	16,000
Repayment of revolver	0	(83,000)
Payment of financing costs	(92)	(51,605)
Payment of deferred consideration	(818)	(707)
Principal payments on capital lease obligations	(2,037)	(1,439)
Proceeds from exercise of stock options	628	593
Net cash provided by (used in) financing activities	(11,244)	927,095
Net effect of exchange rate on cash and cash equivalents	2,327	566
Net increase in cash and cash equivalents	15,374	46,247
Cash and cash equivalents:
Beginning of period	53,596	33,030
End of period	68,970	79,277
Supplemental cash flow information:
Interest paid	46,546	16,659
Income taxes paid	$ 952	$ 968

Nature of Business

Nature of Business	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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 have been 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 March 31, 2017 , and the related consolidated statements of operations and comprehensive income (loss) for the three months ended March 31, 2016 and 2017 , cash flows for the three months ended March 31, 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 March 31, 2017 , results of operations for the three months ended March 31, 2016 and 2017 and cash flows for the three months ended March 31, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive income (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. During the three months ended March 31, 2016 and 2017 , the Company capitalized internal-use software development costs of $2.6 million and $2.9 million , respectively. 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 weight 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 20: 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 March 31, 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 our current financial projections are not achieved, it is possible that we may experience impairments for some of our intangible assets, which may require us 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 March 31, 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 $1,256.0 million , respectively. The Company had goodwill of $1.9 billion as of December 31, 2016 and March 31, 2017 , and no impairment charges have been recorded. 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 months ended March 31, 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 three months ended March 31, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired. 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 income (loss). No such impairment loss was identified during the three months ended March 31, 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 $0.6 million as of December 31, 2016 and March 31, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and March 31, 2017 was $2.1 million . Based on refund history, approximately 81% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 94% 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 months ended March 31, 2016 and 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. During the three months ended March 31, 2016 and 2017 , the Company did not recognize any interest and 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 income (loss). The Company’s basic net income (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 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net income (loss) attributable to Endurance International Group Holdings, Inc. $ 21,811 $ (35,388 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net income (loss) per share attributable to Endurance International Group Holdings Inc. $ 0.17 $ (0.26 ) Diluted net income (loss) per share attributable to Endurance International Group Holdings Inc. $ 0.16 $ (0.26 ) Weighted-average common shares used in computing net income (loss) per share attributable to Endurance International Group Holdings, Inc.: Basic 132,178,693 134,935,153 Diluted 133,563,884 134,935,153 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 March 31, 2016 2017 (unaudited) Restricted stock awards and units 5,874,094 3,974,080 Options 7,793,165 11,037,570 Total 13,667,259 15,011,650 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 trans

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 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 income (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. Pro Forma Disclosure The Company acquired Constant Contact on February 9, 2016, and the results of Constant Contact have been included in the results of the Company since February 10, 2016. The following unaudited information is presented as if the Constant Contact acquisition was completed as of January 1, 2015. The Company has not presented unaudited pro forma results for the quarterly periods following March 31, 2016, as Constant Contact is included for the entire fiscal periods after that date. The unaudited pro forma results are not necessarily indicative of the actual results that would have occurred had the transaction actually taken place at the beginning of the period indicated. Unaudited pro forma revenue for the three months ended March 31, 2016 was $ 277.8 million and unaudited pro forma net income attributable to Endurance International Group Holdings, Inc. for the three months ended March 31, 2016 was $ 35.6 million . Pro forma revenue for the three months ended March 31, 2016 has been reduced by $ 13.7 million , due to the application of purchase accounting for Constant Contact, which reduced the fair value of deferred revenue as of the closing date. Additionally, pro forma net income for the three months ended March 31, 2016 includes restructuring charges of approximately $ 11.4 million , as the Company implemented plans to reduce the cost structure of the combined businesses. Summary of Deferred Consideration Related to Acquisitions Components of short-term and long-tern deferred consideration as of December 31, 2016 and March 31, 2017 , consisted of the following: December 31, 2016 March 31, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — 50 — Social Booster (Acquired in 2016) 40 25 40 25 AppMachine (Acquired in 2016) 4,365 7,419 4,435 7,539 Total $ 5,273 $ 7,444 $ 4,525 $ 7,564

Property and Equipment and Capi

Property and Equipment and Capital Lease Obligations	3 Months Ended
	Mar. 31, 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 March 31, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 6,165 Software 52,130 54,611 Computers and office equipment 143,091 150,461 Furniture and fixtures 10,892 10,974 Leasehold improvements 21,244 21,498 Construction in process 6,691 7,010 Property and equipment—at cost 240,355 251,509 Less accumulated depreciation (145,083 ) (158,046 ) Property and equipment—net $ 95,272 $ 93,463 Depreciation expense related to property and equipment for the three months ended March 31, 2016 and 2017 was $13.2 million and $13.1 million , respectively. Property under capital lease with a cost basis of $ 21.5 million was included in software as of March 31, 2017 . The net carrying value of property under capital lease as of March 31, 2017 was $ 5.2 million .

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 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 March 31, 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 three months ended March 31, 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 March 31, 2017 Financial assets: Interest rate cap (included in other assets) $ 693 — $ 693 $ — Total financial assets $ 693 $ — $ 693 $ — The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of March 31, 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 March 31, 2017 $ —

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 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 months ended March 31, 2017 . As of March 31, 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 March 31, 2017 was $0.7 million , and the Company recognized an immaterial amount of interest expense in the Company’s consolidated statement of operations for the three months ended March 31, 2017 . The Company recognized a $0.2 million loss, net of an immaterial tax benefit, in AOCI for the three months ended March 31, 2017 , of which the Company estimates that $0.9 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	3 Months Ended
	Mar. 31, 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 March 31, 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 382 — 382 Goodwill balance at March 31, 2017 $ 1,255,986 $ 604,305 $ 1,860,291 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 three months ended March 31, 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. There were no impairment charges of intangible assets during the three months ended March 31, 2017 . At March 31, 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 $ 284,043 $ 119,810 $ 164,233 7 years Subscriber relationships 659,762 366,163 293,599 7 years Trade-names 133,806 61,280 72,526 8 years Intellectual property 34,120 11,145 22,975 13 years Domain names available for sale 30,121 5,431 24,690 Indefinite Leasehold interests 314 314 — 1 year Total March 31, 2017 $ 1,142,166 $ 564,143 $ 578,023 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 $29.9 million and $34.3 million for the three months ended March 31, 2016 and 2017 , respectively.

Investments

Investments	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments As of December 31, 2016 and March 31, 2017 , the Company’s carrying value of investments in privately-held companies was $15.9 million and $15.9 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 March 31, 2016 and 2017 , the Company purchased $ 0.3 million and $ 0.5 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 income (loss). As of December 31, 2016 and March 31, 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. 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, which is a provider of technology and sales 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 remaining 60% of AppMachine was acquired 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 income (loss). The Company recognized net losses of $0.7 million and $0.0 million for the three months ended March 31, 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 March 31, 2017 , the Company was not obligated to fund any follow-on investments in these investee companies. As of March 31, 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	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Notes Payable	Notes Payable At December 31, 2016 and March 31, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: For the Year Ended December 31, 2016 For the Three Months Ended March 31, 2017 (in thousands) First Lien Term Loan $ 985,640 $ 980,410 Incremental First Lien Term Loan 674,860 672,812 Senior Notes 326,480 327,010 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,980,232 Current Portion of Notes Payable 35,700 35,700 Notes Payable - long term $ 1,951,280 $ 1,944,532 First Lien Term Loan Facility The Company has a first lien term loan (“First Lien”), which originated in November 2013, had an original balance of $1,050.0 million and a maturity date of November 9, 2019. As of December 31, 2016 and March 31, 2017 , the First Lien had an outstanding balance of: For the Year Ended December 31, 2016 For the Three Months Ended March 31, 2017 (in thousands) First Lien Term Loan $ 985,875 $ 980,625 Unamortized deferred financing costs (235 ) (215 ) Net First Lien Term Loan 985,640 980,410 Current portion of First Lien Term Loan 21,000 21,000 First Lien Term Loan - long term $ 964,640 $ 959,410 The First Lien automatically bears interest at the bank’s reference rate unless the Company gives 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 the LIBOR rate or 1.00% , and the interest rate for a reference rate term loan was 3.00% per annum plus the greater of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR rate or 2.00% . The First Lien bore interest at a LIBOR-based rate of 5.00% during this period. As a result of the refinancing on February 9, 2016 (the “Refinancing”) in connection with the acquisition of Constant Contact and the triggering of the “most-favored nation” pricing provision in the First Lien, the interest rate on the First Lien increased to LIBOR (subject to a LIBOR floor of 1.0% ) plus 5.23% per annum starting February 9, 2016 and to LIBOR (subject to a LIBOR floor of 1.0% ) plus 5.48% per annum on February 28, 2016. The interest rate on a reference First Lien loan increased to reference rate (subject to a floor of 2.0% ) plus 4.23% per annum starting February 9, 2016 and to reference rate (subject to a floor of 2.0% ) plus 4.48% per annum starting February 28, 2016. The First Lien requires quarterly mandatory repayments of principal. As a result of the Refinancing, the Company is obligated to use commercially reasonable efforts to make voluntary repayments on the First Lien to effectively double the amount of each scheduled amortization payment under this facility. During the three months ended March 31, 2016 and 2017, the Company made mandatory repayments of $2.6 million and voluntary prepayments of $2.6 million against the First Lien, in each respective period. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or 6 months. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or 6 months. Interest is payable at the end of each fiscal quarter for a reference rate interest First Lien loan. Incremental First Lien Term Loan Facility In connection with the acquisition of Constant Contact on February 9, 2016, the Company entered into the Incremental First Lien Term Loan (the “Incremental First Lien”) in the principal amount of $735.0 million . As of December 31, 2016 and March 31, 2017 , the Incremental First Lien had an outstanding balance of: For the Year Ended December 31, 2016 For the Period Ended March 31, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ 716,625 Unamortized deferred financing costs (25,869 ) (24,945 ) Unamortized original issuance discount (19,571 ) (18,868 ) Net Incremental First Lien Term Loan 674,860 672,812 Current portion of Incremental First Lien Term Loan 14,700 14,700 Incremental First Lien Term Loan - long term $ 660,160 $ 658,112 The Incremental First Lien matures seven years from issuance, 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 under certain circumstances), bears interest at a rate of LIBOR plus 5.0% per annum, subject to a LIBOR floor of 1.0% per annum, or at an alternate rate with a spread of 4.0% , subject to a floor of 2.0% per annum, and has 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 bears interest at the bank’s reference rate unless the Company gives notice to opt for LIBOR-based interest rate term loans. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or 6 months. Interest is payable at the end of each fiscal quarter for a reference rate loan term loan. During the three months ended March 31, 2017, the Company made $3.7 million in mandatory prepayments against the Incremental First Lien. Revolving Credit Facility The Company had an existing credit facility of $125.0 million (the “Prior Revolver”) which 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 interest loan. The interest rate for an alternate rate base revolver loan was 5.25% per annum plus the greater of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR rate or 2.25% . The interest rate for a LIBOR based revolver loan was 6.25% per annum plus the greater of the LIBOR rate or 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. As a result of the Refinancing, the Company entered into a new revolving facility (the “Current Revolver”), which increased the Company’s available revolving credit to $165.0 million . The Current Revolver has a “springing” maturity date of August 10, 2019 unless the First Lien has been repaid in full or otherwise extended to at least 91 days after the maturity of the Current Revolver. As of December 31, 2016 and March 31, 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 LIBOR plus 4.0% per annum (subject to a leverage-based step-down), without a LIBOR floor. Alternate base interest revolver loans bear interest at the alternate rate plus 3.0% (subject to a leverage-based step down), without an alternate rate floor. 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 6 months. Interest is payable at the end of each fiscal quarter for a reference rate revolver loan. Senior Notes On February 9, 2016, EIG Investors issued $350.0 million aggregate principal amount of senior notes (the "Notes"). The Notes will mature in February 1, 2024, were issued at a price of 98.065% of par and will 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 First Lien and Incremental First Lien (collectively, the "Senior Credit Facilities") (including Constant Contact and certain of its subsidiaries). As of December 31, 2016 and March 31, 2017 , the Notes had an outstanding balance of: For the Year Ended December 31, 2016 For the Period Ended March 31, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (16,852 ) Unamortized original issuance discount (6,282 ) (6,138 ) Net Senior Notes 326,480 327,010 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 327,010 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 we 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 relating to the First Lien, and unamortized balances of deferred financing costs and of original issue discounts relating to the Incremental Term Lien and the Notes are presented as a reduction of the notes payable in our consolidated balance sheets. The unamortized value of deferred financing costs associated with our 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 March 31, 2017 is as follows: Maturity Date as of December 31, (in thousands) (Remainder of) 2017 $ 26,775 2018 35,700 2019 958,575 2020 14,700 2021 14,700 Thereafter 996,800 Total $ 2,047,250 Interest The Company recorded $30.4 million and $39.5 million in interest expense for the three months ended March 31, 2016 and 2017 , respectively. The following table provides a summary of interest rates and interest expense for the three months ended March 31, 2016 and 2017 : Three Months Ended March 31, 2016 Three Months Ended March 31, 2017 (dollars in thousands) Interest rate—LIBOR 6.00%-7.75% 6.00%-6.53% Interest rate—reference 7.50%-8.50% * Interest rate—Senior Notes 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % Interest expense and service fees $ 27,996 $ 36,655 Amortization of deferred financing fees 911 1,744 Amortization of original issue discounts 449 846 Amortization of net present value of deferred consideration 783 190 Other interest expense 232 81 Total interest expense $ 30,371 $ 39,516 * The Company did not use this facility for the three months ended March 31, 2017. Debt Covenants The Senior Credit Facilities require that the Company complies with a financial covenant to maintain a maximum ratio of consolidated senior secured indebtedness to Bank Adjusted EBITDA (as defined in the credit agreement). Please see "Management's Discussion and Analysis" for further discussion of Bank Adjusted EBITDA and 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. 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. The Company was in compliance with all covenants at March 31, 2017. 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.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 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 12,521 Reclassification of stock-compensation liability award 450 Stock option exercises 628 Foreign currency translation adjustment 686 Unrealized loss on derivative (216 ) Net loss attributable to non-controlling interest 226 Net loss attributable to Endurance International Group (35,388 ) Balance at March 31, 2017 $ 103,290

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
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 March 31, 2017 , there were 17,052,912 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 March 31, 2017 , there were 9,483,732 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 income (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 2016 2017 (in thousands) Cost of revenue $ 770 $ 1,506 Sales and marketing 1,722 1,854 Engineering and development 764 1,170 General and administrative 15,132 8,394 Total stock-based compensation expense $ 18,388 $ 12,924 2013 Stock Incentive Plan The following table provides a summary of the Company’s stock options as of March 31, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the three months ended March 31, 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 (106,555 ) $ 12.40 Expired (190,281 ) $ 13.10 Outstanding at March 31, 2017 9,421,028 $ 12.74 7.7 $ — Exercisable at March 31, 2017 4,643,602 $ 13.21 6.8 $ — Expected to vest after March 31, 2017 (1) 4,777,426 $ 12.28 8.5 $ — Exercisable as of March 31, 2017 and expected to vest (2) 9,421,028 $ 12.74 7.7 $ — (1) This represents the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (2) This represents the number of vested options as of March 31, 2017 plus the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (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 March 31, 2017 of $7.85 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 2013 Plan generally vest monthly over a four -year period. The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the three months ended March 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Vested and unissued (30,132 ) $ 12.00 Non-vested at March 31, 2017 70,237 $ 12.00 Unless otherwise determined by the Company’s board of directors, restricted stock awards granted under the 2013 Plan generally vest annually over a four -year period. 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 three months ended March 31, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (768,386 ) $ 8.41 Canceled (53,535 ) $ 12.21 Non-vested at March 31, 2017 6,671,044 $ 13.65 2015 Performance Based Award The performance-based restricted stock award granted to the Company’s chief executive officer 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. No Award Shares were earned for the Performance Quarter ending March 31, 2017 because the threshold level for the 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. Refer to Note 20 : Subsequent Events . 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 months ended March 31, 2017 , the Company recognized $2.1 million of stock-based compensation expense related to this performance-based award. 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”). The shares subject to the performance-based restricted stock awards were earned based on the Company’s Constant Contact brand achieving a pre-established level of adjusted revenue (weighted 50% ), adjusted EBITDA (weighted 25% ) and adjusted free cash flow (weighted 25% ), each as defined in the award agreement and in each case for the twelve months ending December 31, 2016, assuming for this purpose that the Company’s acquisition of Constant Contact had taken place on January 1, 2016 (the “Performance Metric”). As of March 31, 2017 , 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 are evaluated quarterly to determine the probability of vesting and determine the amount of stock-based compensation to be recognized. During the three months ended March 31, 2017 , the Company recognized $1.2 million 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 March 31, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the three months ended March 31, 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 (90,320 ) $ 6.96 Forfeited (128,677 ) $ 9.67 Outstanding at March 31, 2017 1,727,557 $ 8.75 4.9 $ 1,227 Exercisable at March 31, 2017 552,672 $ 7.01 3.6 $ 871 Expected to vest after March 31, 2017 (1) 1,174,885 $ 9.57 5.4 $ 356 Exercisable as of March 31, 2017 and expected to vest (2) 1,727,557 $ 8.75 4.9 $ 1,227 (1) This represents the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (2) This represents the number of vested options as of March 31, 2017 plus the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (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 March 31, 2017 of $7.85 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 three months ended March 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 7,362 $ 8.15 Vested (145,589 ) $ 7.69 Canceled (90,821 ) $ 9.67 Non-vested at March 31, 2017 1,244,607 $ 9.39

Accumulated Other Comprensive I

Accumulated Other Comprensive Income	3 Months Ended
	Mar. 31, 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) 686 (216 ) 470 Balance at March 31, 2017 $ (1,709 ) $ (1,487 ) $ (3,196 )

Variable Interest Entity

Variable Interest Entity	3 Months Ended
	Mar. 31, 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 March 31, 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	3 Months Ended
	Mar. 31, 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 provide 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 are subject to put options that are outside the control of the Company, they are deemed redeemable non-controlling interests and are also not recorded in permanent equity, and are 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 and the Company’s ownership of WZ UK was diluted from 77.5% to 76.4% . Immediately subsequent to the restructuring, the Company acquired an additional 10% stake in WZ UK on July 13, 2016 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 $3.6 million for the three months ended March 31, 2017 , which is reflected in net loss attributable to accretion of non-controlling interest in the Company’s consolidated statements of operations and comprehensive income (loss). Prior to the third quarter of 2016, the Company did not have any accretion amounts in excess of fair value. 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 3,584 Balance as of March 31, 2017 $ 21,337 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	3 Months Ended
	Mar. 31, 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 and 2015 and Israel for the fiscal years ended December 31, 2012, 2013 and 2014. 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 March 31, 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 March 31, 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 March 31, 2017, as the deferred tax liabilities have continued to decrease and the Company generated additional pre-tax losses. As of March 31, 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 $14.5 million to its valuation allowance during the quarter ended March 31, 2017, mostly related to the different book and tax treatment of goodwill. For the three months ended March 31, 2016 and 2017 , the Company recognized tax benefit of $99.9 million and a tax expense of $5.8 million , respectively, in the consolidated statements of operations and comprehensive income (loss). The income tax expense for the three months ended March 31, 2017 was primarily attributable to a federal and state deferred tax expense of $3.7 million due primarily to the different book and tax treatment of goodwill, federal and state current income taxes of $1.4 million , a foreign current tax expense of $0.9 million , partially offset by a foreign deferred tax benefit of $0.2 million . The income tax benefit for the three months ended March 31, 2016 was primarily attributable to a $73.6 million reversal of the valuation allowance, a federal and state deferred tax benefit of $29.0 million , which includes the identification and recognition of $7.3 million of U.S. federal research and development tax credits, and a foreign deferred tax benefit of $0.7 million , partially offset by a provision for federal and state current income taxes of $2.2 million and foreign current tax expense of $1.1 million . The provision for income taxes shown on the consolidated statements of operations and comprehensive income (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). As of the date of the Company’s acquisition of Constant Contact, Constant Contact had approximately $60.2 million and $32.4 million of federal and state NOLs, respectively, and approximately $10.9 million of U.S. federal research and development credits and $9.2 million of state credits.

Severance and Other Exit Costs

Severance and Other Exit Costs	3 Months Ended
	Mar. 31, 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. 2014 Restructuring Plan During the year ended December 31, 2014, the Company implemented plans to further integrate and consolidate its data center, support and engineering operations, resulting in severance and facility exit costs (the “2014 Restructuring Plan”). The severance charges were associated with eliminating approximately 90 positions across primarily support, engineering operations and sales and marketing. The Company incurred severance costs of $2.3 million in the year ended December 31, 2014 related to these restructuring activities. The employee-related charges associated with these restructurings were completed during the year ended December 31, 2014. As of March 31, 2017 , the Company did not have any remaining accrued employee severance related to these severance costs. The Company had incurred facility costs associated with closing offices in Redwood City, California and Englewood, Colorado. At the time of closing these offices, the Company had remaining lease obligations of approximately $3.0 million for these vacated facilities through March 31, 2018. The Company recorded a facilities charge for these future lease payments, less expected sublease income, of $2.1 million during the year ended December 31, 2014. There were no adjustments related to the 2014 Restructuring Plan during the three months ended March 31, 2017 . The Company paid $0.2 million of facility costs related to the 2014 Restructuring Plan and received sublease income of $0.2 million during the three months ended March 31, 2017 , and had a remaining accrued facility liability of $0.2 million as of March 31, 2017 . The Company expects payments related to the 2014 Restructuring 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 months ended March 31, 2017 . The Company paid $1.0 million of severance costs during the three months ended March 31, 2017 and had a remaining accrued severance liability of $0.5 million as of March 31, 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 months ended March 31, 2017 , the Company recorded an adjustment to the Waltham facilities charge for future lease payments of $1.1 million due to a change in estimated sublease income. The Company paid $1.3 million of facility costs related to the 2016 Restructuring Plan during the three months ended March 31, 2017 and had a remaining accrued facility liability of $8.6 million as of March 31, 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. 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 35 individuals. In connection with these plans, the Company incurred severance costs of $4.5 million and paid $0.7 million during the three months ended March 31, 2017 . The Company had a remaining accrued severance liability of $3.8 million as of March 31, 2017 . The Company expects to incur severance charges through June 30, 2017 regarding this plan, and expects severance payments related to this plan to be completed during the year ended December 31, 2018. Activity of Combined Restructuring Plans The following table provides a summary of the aggregate activity for the three months ended March 31, 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 2,345 2,227 4,572 Cash paid (641 ) (1,193 ) (1,834 ) Balance at March 31, 2017 $ 2,337 $ 1,960 $ 4,297 The following table provides a summary of the aggregate activity for the three months ended March 31, 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 (10 ) 1,065 1,055 Sublease income received 188 — 188 Cash paid (246 ) (1,251 ) (1,497 ) Balance at March 31, 2017 $ 205 $ 8,561 $ 8,766 The following table presents restructuring charges recorded in the consolidated statements of operations and comprehensive income (loss) for the periods presented: For the Three Months Ended March 31, For the Three Months Ended March 31, 2016 2017 (in thousands) Cost of revenue $ 3,279 $ 2,743 Sales and marketing 3,901 1,374 Engineering and development 2,018 652 General and administrative 2,218 858 Total restructuring charges $ 11,416 $ 5,627

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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. 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, Machado v. Endurance International Group Holdings, Inc., et al., Civil Action No. 1:15-cv-11775-GAO. In a second amended complaint, filed on March 18, 2016, the plaintiff alleged claims for violations of Section 10(b) and 20(a) of the Exchange Act, on behalf of a purported class of purchasers of the Company’s securities between February 25, 2014 and February 29, 2016. Those claims challenged as false or misleading certain of the Company’s disclosures about its total number of subscribers, average revenue per subscriber, the number of customers paying over $500 per year for the Company’s products and services, the average number of products sold per subscriber, and customer churn. The plaintiff seeks, on behalf of himself and the purported class, compensatory damages and his costs and expenses of litigation. The Company filed a motion to dismiss on May 16, 2016, which remains pending. In August 2016, the parties in the Machado action and another potential claimant, who asserts that he purchased common stock in the Company’s initial public offering, agreed to toll, as of July 1, 2016, the statutes of limitation and repose for all claims under the Securities Act of 1933 that the plaintiff and claimant might bring, individually or in a representative capacity, arising from alleged actions or omissions between September 9, 2013 and February 29, 2016. 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 current proceeding or any additional claims if they are brought. 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. 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. RPost has appealed, and the appellate court is expected to hear oral argument on the appeal in the Spring of 2017. The litigation against Constant Contact remains stayed, and is in its early stages. The Company believes it has meritorious defenses to any claim of infringement and intends to defend against the lawsuit vigorously. 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. 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	3 Months Ended
	Mar. 31, 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 three months ended March 31, 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 income (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 March 31, 2017 , approximately $1.8 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended 2016 2017 (in thousands) Cost of revenue $ 3,100 $ 2,900 Sales and marketing 100 100 Engineering and development 300 450 General and administrative 100 50 Total related party transaction expense, net $ 3,600 $ 3,500 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 income (loss) for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended 2016 2017 (in thousands) Revenue $ (600 ) $ (1,100 ) Revenue (contra) 2,100 2,200 Total related party transaction impact to revenue $ 1,500 $ 1,100 Cost of revenue 200 200 Total related party transaction expense, net $ 1,700 $ 1,300 As of December 31, 2016 and March 31, 2017 , approximately $0.2 million and $0.1 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 March 31, 2017 , approximately $1.1 million and $1.5 million , respectively was included in accounts payable and accrued expense relating to the Company’s agreements with IBS. As of December 31, 2016 and March 31, 2017 , approximately $0.6 million and $0.7 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, Sachs & Co. is a significant shareholder of the Company. Refer to Note 5 : Fair Value Measurements , for further details.

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 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 ended March 31, 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 $ 198,048 $ 39,065 $ 237,113 $ 197,348 $ 97,789 $ 295,137 Gross Profit 89,885 10,752 100,637 86,616 59,772 146,388 Net income (loss) 40,134 (26,053 ) 14,081 (23,626 ) (7,952 ) (31,578 ) Interest expense, net (1) 17,016 13,221 30,237 16,879 22,519 39,398 Income tax expense (benefit) (84,258 ) (15,644 ) (99,902 ) 10,551 (4,777 ) 5,774 Depreciation 8,977 4,195 13,172 9,238 3,873 13,111 Amortization of other intangible assets 19,755 10,119 29,874 15,905 18,362 34,267 Stock-based compensation 14,647 3,741 18,388 11,100 1,824 12,924 Restructuring expenses 171 11,431 11,602 2,335 3,292 5,627 Transaction expenses and charges 30,357 763 31,120 — 580 580 Gain of unconsolidated entities (2) (10,727 ) — (10,727 ) — — — Impairment of other long-lived assets 1,437 — 1,437 — — — Adjusted EBITDA $ 37,509 $ 1,773 $ 39,282 $ 42,382 $ 37,721 $ 80,103 Consolidated Balance Sheets: As of As of Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $ 1,523,170 $ 1,233,104 $ 2,756,274 $ 1,476,006 $ 1,263,261 $ 2,739,267 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. (2) The gain of unconsolidated entities is reported on a net basis for the three months ended March 31, 2016. The three months ended March 31, 2016 includes a gain of $11.4 million on our investment in WZ UK Ltd. This gain was generated on January 6, 2016, when we increased our ownership stake in WZ UK Ltd. from 49% to 57.5% , which required a revaluation of our existing investment to its implied fair value. This $11.4 million gain was partially offset by our proportionate shares of net losses from unconsolidated entities of $0.7 million .

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company evaluated all subsequent events occurring through May 5, 2017, to determine if any such events should be reflected in these financial statements. There were no material recognized subsequent events recorded in the March 31, 2017 financial statements, except as follows: On April 3, 2017, Kenneth Surdan informed the Company of his intention to resign from his position as chief product officer. The effective date of Mr. Surdan’s resignation has not been determined yet, but is expected to be in July 2017. The Company does not expect a material impact to the financial statements as a result of this resignation. In April 2017, the Company announced that its board of directors and its chief executive officer Hari Ravichandran 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. During the transition period, Mr. Ravichandran will continue to be paid his existing base salary and his equity awards will continue to vest and be exercisable in accordance with their existing terms. Upon conclusion of the transition, Mr. Ravichandran will receive continued payment of his base salary of $200,000 for a period of 24 months and a lump sum payment equal to 18 months of COBRA premiums. Mr. Ravichandran would be required to pay to continue group health insurance coverage. In addition, his vested stock options were modified to extend the exercise period by one year to within two years of the separation date. The Company does not expect the severance and stock option modification to have a material impact to the Company’s financial statements. Depending on the timing of identifying a successor, the CEO transition plan may affect other outstanding equity awards held by Mr. Ravichandran. If not previously delivered on the earlier of November 24, 2017 or the other events specified in Mr. Ravichandran’s restricted stock unit award dated October 25, 2013, in accordance with the terms of this award, the shares represented by vested restricted stock units subject to this award will be delivered to Mr. Ravichandran six months and one day following the separation and any unvested restricted stock units will be forfeited. Additionally, in accordance with the terms of the 2015 Performance Based Award, described more fully in Note 11 : Stock-Based Compensation , upon separation Mr. Ravichandran will receive the Award Shares earned with respect to Performance Quarters completed prior to the separation, plus the greater of (i) the target number of Award Shares eligible to be earned in the Performance Quarter in which the separation occurs and (ii) 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 employment through the end of such Performance Quarter. Award Shares eligible to be earned in Performance Quarters following the Performance Quarter in which the separation occurs will be forfeited. At the same time, the period over which the underlying compensation expense is attributed will likely shorten, which will impact the timing and amount of stock-based compensation in future quarters during fiscal year 2017.

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information	3 Months Ended
	Mar. 31, 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 December 31, 2017, and supplemental condensed consolidating results of operations and cash flow information for the three months ended March 31, 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 March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 84 $ 3 $ 52,414 $ 16,469 $ — $ 68,970 Restricted cash — — 2,619 1,026 — 3,645 Accounts receivable — — 7,943 2,774 — 10,717 Prepaid domain name registry fees — — 31,623 25,368 (158 ) 56,833 Prepaid expenses & other current assets 2,270 53 19,786 11,239 — 33,348 Total current assets 2,354 56 114,385 56,876 (158 ) 173,513 Intercompany receivables, net 29,942 759,133 (646,213 ) (142,862 ) — — Property and equipment, net — — 80,153 13,310 — 93,463 Goodwill — — 1,685,980 174,311 — 1,860,291 Other intangible assets, net — — 559,980 18,043 — 578,023 Investment in subsidiaries 70,606 1,303,098 40,678 — (1,414,382 ) — Other assets — 5,211 22,703 6,063 — 33,977 Total assets $ 102,902 $ 2,067,498 $ 1,857,666 $ 125,741 $ (1,414,540 ) $ 2,739,267 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,747 $ 2,070 $ — $ 15,817 Accrued expenses and other current liabilities — 17,443 61,953 8,377 — 87,773 Deferred revenue — — 307,310 62,477 (547 ) 369,240 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 5,165 — — 5,165 Deferred consideration, short-term — — 4,485 40 — 4,525 Total current liabilities — 53,143 392,660 72,964 (547 ) 518,220 Deferred revenue, long-term — — 80,432 10,807 — 91,239 Notes payable — 1,944,532 — — — 1,944,532 Capital lease obligations — — — — — — Deferred consideration — — 7,539 25 — 7,564 Other long-term liabilities — (783 ) 52,601 1,267 — 53,085 Total liabilities — 1,996,892 533,232 85,063 (547 ) 2,614,640 Redeemable non-controlling interest — — 21,337 — — 21,337 Equity 102,902 70,606 1,303,097 40,678 (1,413,993 ) 103,290 Total liabilities and equity $ 102,902 $ 2,067,498 $ 1,857,666 $ 125,741 $ (1,414,540 ) $ 2,739,267 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended March 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 204,069 $ 33,377 $ (333 ) $ 237,113 Cost of revenue — — 114,631 22,415 (570 ) 136,476 Gross profit — — 89,438 10,962 237 100,637 Operating expense: Sales and marketing — — 54,229 25,071 (6 ) 79,294 Engineering and development — — 12,898 3,357 — 16,255 General and administrative — 44 36,820 3,415 — 40,279 Transaction costs — — 31,099 21 — 31,120 Total operating expense — 44 135,046 31,864 (6 ) 166,948 Income (loss) from operations — (44 ) (45,608 ) (20,902 ) 243 (66,311 ) Interest expense and other income, net — 29,356 (10,440 ) (89 ) — 18,827 Income (loss) before income taxes and equity earnings of unconsolidated entities — (29,400 ) (35,168 ) (20,813 ) 243 (85,138 ) Income tax expense (benefit) — (11,216 ) (89,134 ) 448 — (99,902 ) Loss before equity earnings of unconsolidated entities — (18,184 ) 53,966 (21,261 ) 243 14,764 Equity loss of unconsolidated entities, net of tax (13,839 ) (32,023 ) 21,945 — 24,600 683 Net loss 13,839 13,839 32,021 (21,261 ) (24,357 ) 14,081 Net loss attributable to non-controlling interest — — (7,730 ) — — (7,730 ) Net loss attributable to Endurance International Group Holdings, Inc. $ 13,839 $ 13,839 $ 39,751 $ (21,261 ) $ (24,357 ) $ 21,811 Comprehensive income (loss): — Foreign currency translation adjustments — — — 342 — 342 Unrealized gain (loss) on cash flow hedge, net of taxes — (1,511 ) — — — (1,511 ) Total comprehensive loss $ 13,839 $ 12,328 $ 39,751 $ (20,919 ) $ (24,357 ) $ 20,642 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 262,096 $ 34,533 $ (1,492 ) $ 295,137 Cost of revenue — — 127,892 22,089 (1,232 ) 148,749 Gross profit — — 134,204 12,444 (260 ) 146,388 Operating expense: Sales and marketing — — 68,068 4,707 (3 ) 72,772 Engineering and development — — 15,290 5,072 — 20,362 General and administrative — 55 35,671 3,354 — 39,080 Transaction costs — — 580 — — 580 Total operating expense — 55 119,609 13,133 (3 ) 132,794 Income (loss) from operations — (55 ) 14,595 (689 ) (257 ) 13,594 Interest expense and other income, net — 39,246 147 5 — 39,398 Income (loss) before income taxes and equity earnings of unconsolidated entities — (39,301 ) 14,448 (694 ) (257 ) (25,804 ) Income tax expense (benefit) — (14,517 ) 19,695 596 — 5,774 Loss before equity earnings of unconsolidated entities — (24,784 ) (5,247 ) (1,290 ) (257 ) (31,578 ) Equity loss of unconsolidated entities, net of tax 31,321 6,538 1,291 — (39,150 ) — Net loss (31,321 ) (31,322 ) (6,538 ) (1,290 ) 38,893 (31,578 ) Net loss attributable to non-controlling interest — — 3,810 — — 3,810 Net loss attributable to Endurance International Group Holdings, Inc. $ (31,321 ) $ (31,322 ) $ (10,348 ) $ (1,290 ) $ 38,893 $ (35,388 ) Comprehensive income (loss): — Foreign currency translation adjustments — — — 686 — 686 Unrealized gain (loss) on cash flow hedge, net of taxes — (216 ) — — — (216 ) Total comprehensive loss $ (31,321 ) $ (31,538 ) $ (10,348 ) $ (604 ) $ 38,893 $ (34,918 ) Condensed Consolidating Statement of Cash Flows Three months ended March 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ — $ (10,910 ) $ 17,833 $ 4,849 $ — $ 11,772 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (881,709 ) — — (881,709 ) Purchases of property and equipment — — (7,264 ) (2,876 ) — (10,140 ) Cash paid for minority investments — — (600 ) — — (600 ) Proceeds from sale of property and equipment — — — — — — Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — — — — — Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (390 ) — (737 ) Net cash used in investing activities — — (889,920 ) (3,266 ) — (893,186 ) 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 — (91,925 ) — — — (91,925 ) Payment of financing costs — (51,605 ) — — — (51,605 ) Payment of deferred consideration — — (38 ) (669 ) — (707 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (1,439 ) — — (1,439 ) Proceeds from exercise of stock options 593 — — — — 593 Capital investments from minority partner — — — — — — Intercompany loans and investments — — — — — — Net cash provided by (used in) financing activities 593 928,648 (1,477 ) (669 ) — 927,095 Net effect of exchange rate on cash and cash equivalents — — — 566 — 566 Net increase (decrease) in cash and cash equivalents 593 917,738 (873,564 ) 1,480 — 46,247 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 605 $ 917,805 $ (852,278 ) $ 13,145 $ — $ 79,277 Condensed Consolidating Statement of Cash Flows Three months ended March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (2,271 ) $ (31,803 ) $ 68,103 $ (354 ) $ — $ 33,675 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — — — — — Purchases of property and equipment — — (8,390 ) (868 ) — (9,258 ) Cash paid for minority investments — — — — — — Proceeds from sale of property and equipment — — 251 — — 251 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — — (33 ) — (33 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — — (344 ) — (344 ) Net cash used in investing activities — — (8,139 ) (1,245 ) — (9,384 ) Cash flows from financing activities: — Proceeds from issuance of notes payable and draws on revolver — — — — — — Repayment of notes payable and revolver — (8,925 ) — — — (8,925 ) Payment of financing costs — (92 ) — — — (92 ) Payment of deferred consideration — — — (818 ) — (818 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (2,037 ) — — (2,037 ) Proceeds from exercise of stock options 628 — — — — 628 Capital investments from minority partner — — — — — — Intercompany loans and investments 1,724 40,819 (44,547 ) 2,004 — — Net cash provided by (used in) financing activities 2,352 31,802 (46,584 ) 1,186 — (11,244 ) Net effect of exchange rate on cash and cash equivalents — — — 2,327 — 2,327 Net increase (decrease) in cash and cash equivalents 81 (1 ) 13,380 1,914 — 15,374 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 84 $ 3 $ 52,414 $ 16,469 $ — $ 68,970

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 have been 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 March 31, 2017 , and the related consolidated statements of operations and comprehensive income (loss) for the three months ended March 31, 2016 and 2017 , cash flows for the three months ended March 31, 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 March 31, 2017 , results of operations for the three months ended March 31, 2016 and 2017 and cash flows for the three months ended March 31, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive income (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 weight 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 20: 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 months ended March 31, 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 three months ended March 31, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired. 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 income (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 $0.6 million as of December 31, 2016 and March 31, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and March 31, 2017 was $2.1 million . Based on refund history, approximately 81% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 94% 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 months ended March 31, 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 income (loss). The Company’s basic net income (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.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 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	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 income (loss). The Company’s basic net income (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 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net income (loss) attributable to Endurance International Group Holdings, Inc. $ 21,811 $ (35,388 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net income (loss) per share attributable to Endurance International Group Holdings Inc. $ 0.17 $ (0.26 ) Diluted net income (loss) per share attributable to Endurance International Group Holdings Inc. $ 0.16 $ (0.26 ) Weighted-average common shares used in computing net income (loss) per share attributable to Endurance International Group Holdings, Inc.: Basic 132,178,693 134,935,153 Diluted 133,563,884 134,935,153
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 March 31, 2016 2017 (unaudited) Restricted stock awards and units 5,874,094 3,974,080 Options 7,793,165 11,037,570 Total 13,667,259 15,011,650

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 , consisted of the following: December 31, 2016 March 31, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — 50 — Social Booster (Acquired in 2016) 40 25 40 25 AppMachine (Acquired in 2016) 4,365 7,419 4,435 7,539 Total $ 5,273 $ 7,444 $ 4,525 $ 7,564

Property and Equipment and Ca31

Property and Equipment and Capital Lease Obligations (Tables)	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Components of property and equipment consisted of the following: December 31, 2016 March 31, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 6,165 Software 52,130 54,611 Computers and office equipment 143,091 150,461 Furniture and fixtures 10,892 10,974 Leasehold improvements 21,244 21,498 Construction in process 6,691 7,010 Property and equipment—at cost 240,355 251,509 Less accumulated depreciation (145,083 ) (158,046 ) Property and equipment—net $ 95,272 $ 93,463

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 Financial assets: Interest rate cap (included in other assets) $ 693 — $ 693 $ — Total financial assets $ 693 $ — $ 693 $ —
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 March 31, 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 March 31, 2017 $ —

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 382 — 382 Goodwill balance at March 31, 2017 $ 1,255,986 $ 604,305 $ 1,860,291
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 three months ended March 31, 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. There were no impairment charges of intangible assets during the three months ended March 31, 2017 . At March 31, 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 $ 284,043 $ 119,810 $ 164,233 7 years Subscriber relationships 659,762 366,163 293,599 7 years Trade-names 133,806 61,280 72,526 8 years Intellectual property 34,120 11,145 22,975 13 years Domain names available for sale 30,121 5,431 24,690 Indefinite Leasehold interests 314 314 — 1 year Total March 31, 2017 $ 1,142,166 $ 564,143 $ 578,023

Notes Payable (Tables)

Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	At December 31, 2016 and March 31, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: For the Year Ended December 31, 2016 For the Three Months Ended March 31, 2017 (in thousands) First Lien Term Loan $ 985,640 $ 980,410 Incremental First Lien Term Loan 674,860 672,812 Senior Notes 326,480 327,010 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,980,232 Current Portion of Notes Payable 35,700 35,700 Notes Payable - long term $ 1,951,280 $ 1,944,532 As of December 31, 2016 and March 31, 2017 , the Incremental First Lien had an outstanding balance of: For the Year Ended December 31, 2016 For the Period Ended March 31, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ 716,625 Unamortized deferred financing costs (25,869 ) (24,945 ) Unamortized original issuance discount (19,571 ) (18,868 ) Net Incremental First Lien Term Loan 674,860 672,812 Current portion of Incremental First Lien Term Loan 14,700 14,700 Incremental First Lien Term Loan - long term $ 660,160 $ 658,112 As of December 31, 2016 and March 31, 2017 , the Notes had an outstanding balance of: For the Year Ended December 31, 2016 For the Period Ended March 31, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (16,852 ) Unamortized original issuance discount (6,282 ) (6,138 ) Net Senior Notes 326,480 327,010 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 327,010 As of December 31, 2016 and March 31, 2017 , the First Lien had an outstanding balance of: For the Year Ended December 31, 2016 For the Three Months Ended March 31, 2017 (in thousands) First Lien Term Loan $ 985,875 $ 980,625 Unamortized deferred financing costs (235 ) (215 ) Net First Lien Term Loan 985,640 980,410 Current portion of First Lien Term Loan 21,000 21,000 First Lien Term Loan - long term $ 964,640 $ 959,410
Summary of Future Debt Maturities	The maturity of the notes payable at March 31, 2017 is as follows: Maturity Date as of December 31, (in thousands) (Remainder of) 2017 $ 26,775 2018 35,700 2019 958,575 2020 14,700 2021 14,700 Thereafter 996,800 Total $ 2,047,250
Summary of Interest Rates and Interest Expense	The following table provides a summary of interest rates and interest expense for the three months ended March 31, 2016 and 2017 : Three Months Ended March 31, 2016 Three Months Ended March 31, 2017 (dollars in thousands) Interest rate—LIBOR 6.00%-7.75% 6.00%-6.53% Interest rate—reference 7.50%-8.50% * Interest rate—Senior Notes 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % Interest expense and service fees $ 27,996 $ 36,655 Amortization of deferred financing fees 911 1,744 Amortization of original issue discounts 449 846 Amortization of net present value of deferred consideration 783 190 Other interest expense 232 81 Total interest expense $ 30,371 $ 39,516 * The Company did not use this facility for the three months ended March 31, 2017.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 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 12,521 Reclassification of stock-compensation liability award 450 Stock option exercises 628 Foreign currency translation adjustment 686 Unrealized loss on derivative (216 ) Net loss attributable to non-controlling interest 226 Net loss attributable to Endurance International Group (35,388 ) Balance at March 31, 2017 $ 103,290

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2017
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Awards and Restricted Stock Units	he following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the three months ended March 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Vested and unissued (30,132 ) $ 12.00 Non-vested at March 31, 2017 70,237 $ 12.00
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 three months ended March 31, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (768,386 ) $ 8.41 Canceled (53,535 ) $ 12.21 Non-vested at March 31, 2017 6,671,044 $ 13.65
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 income (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 2016 2017 (in thousands) Cost of revenue $ 770 $ 1,506 Sales and marketing 1,722 1,854 Engineering and development 764 1,170 General and administrative 15,132 8,394 Total stock-based compensation expense $ 18,388 $ 12,924
Summary of Stock Options	The following table provides a summary of the Company’s stock options as of March 31, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the three months ended March 31, 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 (90,320 ) $ 6.96 Forfeited (128,677 ) $ 9.67 Outstanding at March 31, 2017 1,727,557 $ 8.75 4.9 $ 1,227 Exercisable at March 31, 2017 552,672 $ 7.01 3.6 $ 871 Expected to vest after March 31, 2017 (1) 1,174,885 $ 9.57 5.4 $ 356 Exercisable as of March 31, 2017 and expected to vest (2) 1,727,557 $ 8.75 4.9 $ 1,227 (1) This represents the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (2) This represents the number of vested options as of March 31, 2017 plus the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (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 March 31, 2017 of $7.85 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 three months ended March 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 7,362 $ 8.15 Vested (145,589 ) $ 7.69 Canceled (90,821 ) $ 9.67 Non-vested at March 31, 2017 1,244,607 $ 9.39
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 March 31, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the three months ended March 31, 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 (106,555 ) $ 12.40 Expired (190,281 ) $ 13.10 Outstanding at March 31, 2017 9,421,028 $ 12.74 7.7 $ — Exercisable at March 31, 2017 4,643,602 $ 13.21 6.8 $ — Expected to vest after March 31, 2017 (1) 4,777,426 $ 12.28 8.5 $ — Exercisable as of March 31, 2017 and expected to vest (2) 9,421,028 $ 12.74 7.7 $ — (1) This represents the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (2) This represents the number of vested options as of March 31, 2017 plus the number of unvested options outstanding as of March 31, 2017 that are expected to vest in the future, which have been reduced using an estimated forfeiture rate. (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 March 31, 2017 of $7.85 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)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income	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) 686 (216 ) 470 Balance at March 31, 2017 $ (1,709 ) $ (1,487 ) $ (3,196 )

Redeemable Non-controlling In38

Redeemable Non-controlling Interest (Tables)	3 Months Ended
	Mar. 31, 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 3,584 Balance as of March 31, 2017 $ 21,337

Severance and Other Exit Costs

Severance and Other Exit Costs (Tables)	3 Months Ended
	Mar. 31, 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 income (loss) for the periods presented: For the Three Months Ended March 31, For the Three Months Ended March 31, 2016 2017 (in thousands) Cost of revenue $ 3,279 $ 2,743 Sales and marketing 3,901 1,374 Engineering and development 2,018 652 General and administrative 2,218 858 Total restructuring charges $ 11,416 $ 5,627
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 three months ended March 31, 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 2,345 2,227 4,572 Cash paid (641 ) (1,193 ) (1,834 ) Balance at March 31, 2017 $ 2,337 $ 1,960 $ 4,297
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 three months ended March 31, 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 (10 ) 1,065 1,055 Sublease income received 188 — 188 Cash paid (246 ) (1,251 ) (1,497 ) Balance at March 31, 2017 $ 205 $ 8,561 $ 8,766

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 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 income (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 March 31, 2017 , approximately $1.8 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended 2016 2017 (in thousands) Cost of revenue $ 3,100 $ 2,900 Sales and marketing 100 100 Engineering and development 300 450 General and administrative 100 50 Total related party transaction expense, net $ 3,600 $ 3,500
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 income (loss) for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended 2016 2017 (in thousands) Revenue $ (600 ) $ (1,100 ) Revenue (contra) 2,100 2,200 Total related party transaction impact to revenue $ 1,500 $ 1,100 Cost of revenue 200 200 Total related party transaction expense, net $ 1,700 $ 1,300

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 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 ended March 31, 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 $ 198,048 $ 39,065 $ 237,113 $ 197,348 $ 97,789 $ 295,137 Gross Profit 89,885 10,752 100,637 86,616 59,772 146,388 Net income (loss) 40,134 (26,053 ) 14,081 (23,626 ) (7,952 ) (31,578 ) Interest expense, net (1) 17,016 13,221 30,237 16,879 22,519 39,398 Income tax expense (benefit) (84,258 ) (15,644 ) (99,902 ) 10,551 (4,777 ) 5,774 Depreciation 8,977 4,195 13,172 9,238 3,873 13,111 Amortization of other intangible assets 19,755 10,119 29,874 15,905 18,362 34,267 Stock-based compensation 14,647 3,741 18,388 11,100 1,824 12,924 Restructuring expenses 171 11,431 11,602 2,335 3,292 5,627 Transaction expenses and charges 30,357 763 31,120 — 580 580 Gain of unconsolidated entities (2) (10,727 ) — (10,727 ) — — — Impairment of other long-lived assets 1,437 — 1,437 — — — Adjusted EBITDA $ 37,509 $ 1,773 $ 39,282 $ 42,382 $ 37,721 $ 80,103 Consolidated Balance Sheets: As of As of Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $ 1,523,170 $ 1,233,104 $ 2,756,274 $ 1,476,006 $ 1,263,261 $ 2,739,267 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. (2) The gain of unconsolidated entities is reported on a net basis for the three months ended March 31, 2016. The three months ended March 31, 2016 includes a gain of $11.4 million on our investment in WZ UK Ltd. This gain was generated on January 6, 2016, when we increased our ownership stake in WZ UK Ltd. from 49% to 57.5% , which required a revaluation of our existing investment to its implied fair value. This $11.4 million gain was partially offset by our proportionate shares of net losses from unconsolidated entities of $0.7 million .

Supplemental Guarantor Financ42

Supplemental Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 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 December 31, 2017, and supplemental condensed consolidating results of operations and cash flow information for the three months ended March 31, 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 March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 84 $ 3 $ 52,414 $ 16,469 $ — $ 68,970 Restricted cash — — 2,619 1,026 — 3,645 Accounts receivable — — 7,943 2,774 — 10,717 Prepaid domain name registry fees — — 31,623 25,368 (158 ) 56,833 Prepaid expenses & other current assets 2,270 53 19,786 11,239 — 33,348 Total current assets 2,354 56 114,385 56,876 (158 ) 173,513 Intercompany receivables, net 29,942 759,133 (646,213 ) (142,862 ) — — Property and equipment, net — — 80,153 13,310 — 93,463 Goodwill — — 1,685,980 174,311 — 1,860,291 Other intangible assets, net — — 559,980 18,043 — 578,023 Investment in subsidiaries 70,606 1,303,098 40,678 — (1,414,382 ) — Other assets — 5,211 22,703 6,063 — 33,977 Total assets $ 102,902 $ 2,067,498 $ 1,857,666 $ 125,741 $ (1,414,540 ) $ 2,739,267 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,747 $ 2,070 $ — $ 15,817 Accrued expenses and other current liabilities — 17,443 61,953 8,377 — 87,773 Deferred revenue — — 307,310 62,477 (547 ) 369,240 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 5,165 — — 5,165 Deferred consideration, short-term — — 4,485 40 — 4,525 Total current liabilities — 53,143 392,660 72,964 (547 ) 518,220 Deferred revenue, long-term — — 80,432 10,807 — 91,239 Notes payable — 1,944,532 — — — 1,944,532 Capital lease obligations — — — — — — Deferred consideration — — 7,539 25 — 7,564 Other long-term liabilities — (783 ) 52,601 1,267 — 53,085 Total liabilities — 1,996,892 533,232 85,063 (547 ) 2,614,640 Redeemable non-controlling interest — — 21,337 — — 21,337 Equity 102,902 70,606 1,303,097 40,678 (1,413,993 ) 103,290 Total liabilities and equity $ 102,902 $ 2,067,498 $ 1,857,666 $ 125,741 $ (1,414,540 ) $ 2,739,267 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended March 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 204,069 $ 33,377 $ (333 ) $ 237,113 Cost of revenue — — 114,631 22,415 (570 ) 136,476 Gross profit — — 89,438 10,962 237 100,637 Operating expense: Sales and marketing — — 54,229 25,071 (6 ) 79,294 Engineering and development — — 12,898 3,357 — 16,255 General and administrative — 44 36,820 3,415 — 40,279 Transaction costs — — 31,099 21 — 31,120 Total operating expense — 44 135,046 31,864 (6 ) 166,948 Income (loss) from operations — (44 ) (45,608 ) (20,902 ) 243 (66,311 ) Interest expense and other income, net — 29,356 (10,440 ) (89 ) — 18,827 Income (loss) before income taxes and equity earnings of unconsolidated entities — (29,400 ) (35,168 ) (20,813 ) 243 (85,138 ) Income tax expense (benefit) — (11,216 ) (89,134 ) 448 — (99,902 ) Loss before equity earnings of unconsolidated entities — (18,184 ) 53,966 (21,261 ) 243 14,764 Equity loss of unconsolidated entities, net of tax (13,839 ) (32,023 ) 21,945 — 24,600 683 Net loss 13,839 13,839 32,021 (21,261 ) (24,357 ) 14,081 Net loss attributable to non-controlling interest — — (7,730 ) — — (7,730 ) Net loss attributable to Endurance International Group Holdings, Inc. $ 13,839 $ 13,839 $ 39,751 $ (21,261 ) $ (24,357 ) $ 21,811 Comprehensive income (loss): — Foreign currency translation adjustments — — — 342 — 342 Unrealized gain (loss) on cash flow hedge, net of taxes — (1,511 ) — — — (1,511 ) Total comprehensive loss $ 13,839 $ 12,328 $ 39,751 $ (20,919 ) $ (24,357 ) $ 20,642 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 262,096 $ 34,533 $ (1,492 ) $ 295,137 Cost of revenue — — 127,892 22,089 (1,232 ) 148,749 Gross profit — — 134,204 12,444 (260 ) 146,388 Operating expense: Sales and marketing — — 68,068 4,707 (3 ) 72,772 Engineering and development — — 15,290 5,072 — 20,362 General and administrative — 55 35,671 3,354 — 39,080 Transaction costs — — 580 — — 580 Total operating expense — 55 119,609 13,133 (3 ) 132,794 Income (loss) from operations — (55 ) 14,595 (689 ) (257 ) 13,594 Interest expense and other income, net — 39,246 147 5 — 39,398 Income (loss) before income taxes and equity earnings of unconsolidated entities — (39,301 ) 14,448 (694 ) (257 ) (25,804 ) Income tax expense (benefit) — (14,517 ) 19,695 596 — 5,774 Loss before equity earnings of unconsolidated entities — (24,784 ) (5,247 ) (1,290 ) (257 ) (31,578 ) Equity loss of unconsolidated entities, net of tax 31,321 6,538 1,291 — (39,150 ) — Net loss (31,321 ) (31,322 ) (6,538 ) (1,290 ) 38,893 (31,578 ) Net loss attributable to non-controlling interest — — 3,810 — — 3,810 Net loss attributable to Endurance International Group Holdings, Inc. $ (31,321 ) $ (31,322 ) $ (10,348 ) $ (1,290 ) $ 38,893 $ (35,388 ) Comprehensive income (loss): — Foreign currency translation adjustments — — — 686 — 686 Unrealized gain (loss) on cash flow hedge, net of taxes — (216 ) — — — (216 ) Total comprehensive loss $ (31,321 ) $ (31,538 ) $ (10,348 ) $ (604 ) $ 38,893 $ (34,918 ) Condensed Consolidating Statement of Cash Flows Three months ended March 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ — $ (10,910 ) $ 17,833 $ 4,849 $ — $ 11,772 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (881,709 ) — — (881,709 ) Purchases of property and equipment — — (7,264 ) (2,876 ) — (10,140 ) Cash paid for minority investments — — (600 ) — — (600 ) Proceeds from sale of property and equipment — — — — — — Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — — — — — Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (390 ) — (737 ) Net cash used in investing activities — — (889,920 ) (3,266 ) — (893,186 ) 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 — (91,925 ) — — — (91,925 ) Payment of financing costs — (51,605 ) — — — (51,605 ) Payment of deferred consideration — — (38 ) (669 ) — (707 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (1,439 ) — — (1,439 ) Proceeds from exercise of stock options 593 — — — — 593 Capital investments from minority partner — — — — — — Intercompany loans and investments — — — — — — Net cash provided by (used in) financing activities 593 928,648 (1,477 ) (669 ) — 927,095 Net effect of exchange rate on cash and cash equivalents — — — 566 — 566 Net increase (decrease) in cash and cash equivalents 593 917,738 (873,564 ) 1,480 — 46,247 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 605 $ 917,805 $ (852,278 ) $ 13,145 $ — $ 79,277 Condensed Consolidating Statement of Cash Flows Three months ended March 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (2,271 ) $ (31,803 ) $ 68,103 $ (354 ) $ — $ 33,675 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — — — — — Purchases of property and equipment — — (8,390 ) (868 ) — (9,258 ) Cash paid for minority investments — — — — — — Proceeds from sale of property and equipment — — 251 — — 251 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — — (33 ) — (33 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — — (344 ) — (344 ) Net cash used in investing activities — — (8,139 ) (1,245 ) — (9,384 ) Cash flows from financing activities: — Proceeds from issuance of notes payable and draws on revolver — — — — — — Repayment of notes payable and revolver — (8,925 ) — — — (8,925 ) Payment of financing costs — (92 ) — — — (92 ) Payment of deferred consideration — — — (818 ) — (818 ) Payment of redeemable non-controlling interest liability — — — — — — Principal payments on capital lease obligations — — (2,037 ) — — (2,037 ) Proceeds from exercise of stock options 628 — — — — 628 Capital investments from minority partner — — — — — — Intercompany loans and investments 1,724 40,819 (44,547 ) 2,004 — — Net cash provided by (used in) financing activities 2,352 31,802 (46,584 ) 1,186 — (11,244 ) Net effect of exchange rate on cash and cash equivalents — — — 2,327 — 2,327 Net increase (decrease) in cash and cash equivalents 81 (1 ) 13,380 1,914 — 15,374 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 84 $ 3 $ 52,414 $ 16,469 $ — $ 68,970

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)Segment	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015USD ($)Segment
Accounting Policies [Line Items]
Number of reportable segments | Segment	2		2	1
Software development cost capitalized	$ 2,900,000	$ 2,600,000
Goodwill impairment			$ 0	$ 0
Goodwill	1,860,291,000		1,859,909,000
Impairment of long lived assets	$ 0	1,437,000
Contract service period	36 months
Reserves for refunds and chargebacks	$ 600,000		600,000
Deferred revenue expected to be refunded	$ 2,100,000		2,100,000
Percentage of deferred revenue refunded within same fiscal month	81.00%
Percentage of deferred revenue refunded within 45 days	94.00%
Unrecognized tax benefits	$ 0	0
Interest expense and penalties	0	0
Impairment of other long-lived assets	$ 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	7 years
Webzai Limited inc | Engineering and Development
Accounting Policies [Line Items]
Impairment of long lived assets	$ 0	1,400,000
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	1,255,986,000		$ 1,255,604,000
Reporting unit, percentage of fair value in excess of carrying amount			67.00%
Impairment of long lived assets	0	1,437,000
Email Marketing Unit
Accounting Policies [Line Items]
Goodwill	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
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
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Line Items]
Impairment of other long-lived assets	$ 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
Leasehold improvements
Property, Plant and Equipment [Line Items]
Leasehold improvements	Shorter of useful life or remaining term of the lease

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
	Mar. 31, 2017	Mar. 31, 2016
Accounting Policies [Abstract]
Net loss attributable to Endurance International Group	$ (35,388)	$ 21,811
Net loss per share attributable to Endurance International Group Holdings, Inc.:
Basic net income (loss) per share (in usd per share)	$ (0.26)	$ 0.17
Diluted net income (loss) per share (in usd per share)	$ (0.26)	$ 0.16
Weighted-average common shares used in computing net income (loss) per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	134,935,153	132,178,693
Weighted average number of diluted shares outstanding (in shares)	134,935,153	133,563,884

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
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	15,011,650	13,667,259
Restricted Stock Awards and Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	3,974,080	5,874,094
Stock Option Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	11,037,570	7,793,165

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 09, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 1,860,291		$ 1,859,909
Unaudited pro forma revenue			$ 277,800
Unaudited pro forma net income (loss)		35,600
Net income (loss)		$ (31,578)	14,081
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
Reduction in proforma revenue			13,700
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
Restructuring Charges | Constant Contact, Inc.
Business Acquisition [Line Items]
Net income (loss)			$ 11,400

Acquisitions - Summary of Defer

Acquisitions - Summary of Deferred Consideration Related to Acquisition (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Deferred consideration, short-term	$ 4,525	$ 5,273
Deferred consideration, short-term	7,564	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	50	50
Deferred consideration, short-term	0	0
Social Booster
Business Acquisition [Line Items]
Deferred consideration, short-term	40	40
Deferred consideration, short-term	25	25
AppMachine
Business Acquisition [Line Items]
Deferred consideration, short-term	4,435	4,365
Deferred consideration, short-term	$ 7,539	$ 7,419

Property and Equipment and Ca49

Property and Equipment and Capital Lease Obligations - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 251,509	$ 240,355
Less accumulated depreciation	(158,046)	(145,083)
Property and equipment—net	93,463	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	6,165	5,517
Software
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	54,611	52,130
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	150,461	143,091
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	10,974	10,892
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	21,498	21,244
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 7,010	$ 6,691

Property and Equipment and Ca50

Property and Equipment and Capital Lease Obligations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 13,111	$ 13,172
Capital lease included in software	21,500
Property under capital lease, net	$ 5,200

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) $ in Thousands	3 Months Ended
	Mar. 31, 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) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial liabilities:
Fair value of the interest rate contracts	$ 700
Fair Value, Measurements, Recurring
Financial assets:
Interest rate cap (included in other assets)		$ 979
Total financial assets	693	979
Financial liabilities:
Contingent earn-out consideration (included in deferred consideration)		818
Total financial liabilities		818
Fair value of the interest rate contracts	693
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring
Financial assets:
Interest rate cap (included in other assets)	693	979
Total financial assets	$ 693	979
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
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	3 Months Ended
	Mar. 31, 2017USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Financial liabilities measured using Level 3 inputs, Opening balance	$ 818
Payment of contingent earn-outs related to 2012 acquisition	(818)
Change in fair value of contingent earn-outs	0
Financial liabilities measured using Level 3 inputs, Ending balance	$ 0

Derivatives And Hedging Activ54

Derivatives And Hedging Activities - Additional Information (Detail)	Dec. 09, 2015	Mar. 31, 2017USD ($)Agreement	Mar. 31, 2016USD ($)
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		700,000
Interest expense		39,516,000	$ 30,371,000
Income tax expense (benefit)		5,774,000	$ (99,902,000)
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		$ 900,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate cap agreements | Agreement		1
Notional amount outstanding		$ 500,000,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Recognized loss		(200,000)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense		$ 0

Goodwill and Other Intangible55

Goodwill and Other Intangible Assets - Changes in Goodwill Balances (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,859,909
Goodwill related to acquisitions	0
Foreign translation impact	382
Goodwill, ending balance	1,860,291
Web Presence Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	1,255,604
Goodwill related to acquisitions	0
Foreign translation impact	382
Goodwill, ending balance	1,255,986
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	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,142,166	$ 1,141,824
Accumulated Amortization	564,143	529,767
Net Carrying Amount	578,023	612,057
Domains Names Available for Sale [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,121	29,954
Accumulated Amortization	5,431	4,976
Net Carrying Amount	$ 24,690	$ 24,978
Weighted average useful life	Indefinite	Indefinite
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 284,043	$ 284,005
Accumulated Amortization	119,810	111,348
Net Carrying Amount	$ 164,233	$ 172,657
Weighted average useful life	7 years	7 years	7 years
Subscriber Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 659,762	$ 659,662
Accumulated Amortization	366,163	345,070
Net Carrying Amount	$ 293,599	$ 314,592
Weighted average useful life	7 years	7 years
Trade-Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 133,806	$ 133,805
Accumulated Amortization	61,280	57,789
Net Carrying Amount	$ 72,526	$ 76,016
Weighted average useful life	8 years	8 years
Intellectual Property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 34,120	$ 34,084
Accumulated Amortization	11,145	10,270
Net Carrying Amount	$ 22,975	$ 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		12 Months Ended
	Mar. 31, 2017USD ($)Segment	Mar. 31, 2016USD ($)	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	$ 34,267,000	$ 29,874,000
IPR&D | Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment charge of intangible assets	$ 0	$ 1,400,000

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 27, 2016	May 31, 2014	Mar. 31, 2017	Mar. 31, 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			$ 15,857		$ 15,857
Accounts payable			15,817		16,074
Convertible promissory note purchased							$ 600
Equity loss of unconsolidated entities, net of tax			$ 0	$ 683
Proportionate share exceed of the company's consolidated assets or income			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			$ 500	$ 300
Accounts payable			$ 200		$ 100
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%
Maximum
Schedule of Cost-method Investments [Line Items]
Voting interest			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 ($)	Sep. 30, 2016	Feb. 28, 2016	Feb. 09, 2016	Nov. 30, 2013	Feb. 08, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jan. 30, 2017	Mar. 03, 2016	Feb. 29, 2016
Long-Term Debt [Line Items]
Notes payable										$ 600,000
Repayments of long-term debt						$ 8,925,000	$ 8,925,000
Line of credit facility, unused capacity, commitment fee percentage						0.50%	0.50%
Interest expense						$ 39,516,000	$ 30,371,000
Senior Notes Due 2024
Long-Term Debt [Line Items]
Senior notes due			$ 350,000,000
Par value percentage			98.065%
Interest rate, stated percentage			10.875%			10.875%	10.875%
November 2013 First Lien
Long-Term Debt [Line Items]
Notes payable				$ 1,050,000,000
Repayments of long-term debt						$ 2,600,000	$ 2,600,000
Debt instrument voluntary prepayments						$ 2,600,000		$ 2,600,000
LIBOR Based Interest Rate Loan
Long-Term Debt [Line Items]
Debt instrument revised LIBOR rate					4.00%
Basis revised spread on LIBOR rate					1.00%
Alternate Base Rate Loans
Long-Term Debt [Line Items]
Line of credit facility, unused capacity, commitment fee percentage				0.50%
Revolving Credit Facility
Long-Term Debt [Line Items]
Commitment fee percentage			0.50%
10.875% Notes due 2024
Long-Term Debt [Line Items]
Redemption price, percentage						101.00%
Senior notes									$ 350,000,000		$ 350,000,000
Interest rate, stated percentage											10.875%
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Long-term line of credit			$ 735,000,000
Debt instrument, term			7 years
Redemption price, percentage			97.00%
Converted instrument, rate			1.00%
Repayments of long-term debt	$ 3,700,000
Amortization rate			0.50%
Incremental First Lien Term Loan | LIBOR Based Interest Rate Loan
Long-Term Debt [Line Items]
Basis revised spread on LIBOR rate			5.00%
Repayments of long-term debt						$ 3,700,000
Incremental First Lien Term Loan | Reference Rate Loan
Long-Term Debt [Line Items]
Basis spread on reference rate			4.00%
First Lien | LIBOR Based Interest Rate Loan
Long-Term Debt [Line Items]
Basis revised spread on LIBOR rate		5.48%	5.23%
First Lien | Reference Rate Loan
Long-Term Debt [Line Items]
Basis revised spread on LIBOR rate		4.48%	4.23%
November 2013 First Lien | Reference Rate Loan
Long-Term Debt [Line Items]
Reference rate					3.00%
Effective rate on federal funds					0.50%
Basis spread on reference rate		2.00%			2.00%
Revolving Credit Facility
Long-Term Debt [Line Items]
Revolving credit facility maximum borrowing amount			$ 165,000,000	$ 125,000,000		$ 165,000,000		$ 165,000,000
Revolving Credit Facility | LIBOR Based Interest Rate Loan
Long-Term Debt [Line Items]
Basis revised spread on LIBOR rate			4.00%
Basis spread on variable rate				6.25%
Revolving Credit Facility | Alternate Base Rate Loans
Long-Term Debt [Line Items]
Reference rate				5.25%
Effective rate on federal funds				0.50%
Basis spread on reference rate				2.25%
Basis spread on LIBOR rate				1.50%
Revolving Credit Facility | Reference Rate Loan
Long-Term Debt [Line Items]
Basis revised spread on LIBOR rate			3.00%
London Interbank Offered Rate (LIBOR) | First Lien
Long-Term Debt [Line Items]
Interest rate, effective percentage					5.00%
Minimum
Long-Term Debt [Line Items]
Debt instrument alternate base rate							7.50%
Minimum | Incremental First Lien Term Loan | LIBOR Based Interest Rate Loan
Long-Term Debt [Line Items]
Basis spread on variable rate			1.00%
Minimum | Incremental First Lien Term Loan | Reference Rate Loan
Long-Term Debt [Line Items]
Basis spread on reference rate			2.00%
Minimum | November 2013 First Lien | Reference Rate Loan
Long-Term Debt [Line Items]
Basis spread on reference rate			2.00%
Minimum | Revolving Credit Facility
Long-Term Debt [Line Items]
Extension period			91 days
Minimum | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate		1.00%	1.00%
Maximum
Long-Term Debt [Line Items]
Debt instrument alternate base rate							8.50%

Notes Payable - Schedule of Lon

Notes Payable - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Total	$ 1,980,232	$ 1,986,980
Current maturities	35,700	35,700
Excluding current maturities	1,944,532	1,951,280
First Lien Term Loan
Long-Term Debt [Line Items]
Total	980,410	985,640
Current maturities	21,000	21,000
Excluding current maturities	959,410	964,640
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Total	672,812	674,860
Current maturities	14,700	14,700
Excluding current maturities	658,112	660,160
10.875% Notes due 2024
Long-Term Debt [Line Items]
Total	327,010	326,480
Current maturities	0	0
Excluding current maturities	327,010	326,480
LIBOR Revolver Loan
Long-Term Debt [Line Items]
Total	$ 0	$ 0

Notes Payable - Schedule of Fir

Notes Payable - Schedule of First Term Lien Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,047,250
Total	1,980,232	$ 1,986,980
Current maturities	35,700	35,700
Long-term debt, excluding current maturities	1,944,532	1,951,280
First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	980,625	985,875
Unamortized deferred financing costs	(215)	(235)
Total	980,410	985,640
Current maturities	21,000	21,000
Long-term debt, excluding current maturities	$ 959,410	$ 964,640

Notes Payable - Schedule of Inc

Notes Payable - Schedule of Incremental First Lien Term Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,047,250
Deferred financing costs	(42,012)	$ (43,342)
Total	1,980,232	1,986,980
Current maturities	35,700	35,700
Long-term debt, excluding current maturities	1,944,532	1,951,280
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	716,625	720,300
Unamortized deferred financing costs	(24,945)	(25,869)
Deferred financing costs	(18,868)	(19,571)
Total	672,812	674,860
Current maturities	14,700	14,700
Long-term debt, excluding current maturities	$ 658,112	$ 660,160

Notes Payable - Schedule of Sen

Notes Payable - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,047,250
Deferred financing costs	(42,012)	$ (43,342)
Total	1,980,232	1,986,980
Current maturities	35,700	35,700
Long-term debt, excluding current maturities	1,944,532	1,951,280
10.875% Notes due 2024
Long-Term Debt [Line Items]
Long-term debt, gross	350,000	350,000
Unamortized deferred financing costs	(16,852)	(17,238)
Deferred financing costs	(6,138)	(6,282)
Total	327,010	326,480
Current maturities	0	0
Long-term debt, excluding current maturities	$ 327,010	$ 326,480

Notes Payable - Summary of Futu

Notes Payable - Summary of Future Debt Maturities (Detail) $ in Thousands	Mar. 31, 2017USD ($)
Debt Disclosure [Abstract]
(Remainder of) 2017	$ 26,775
2,018	35,700
2,019	958,575
2,020	14,700
2,021	14,700
Thereafter	996,800
Total	$ 2,047,250

Notes Payable - Schedule of Int

Notes Payable - Schedule of Interest Rates and Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Feb. 09, 2016
Long-Term Debt [Line Items]
Current portion of notes payable	$ 35,700		$ 35,700
Line of credit facility, unused capacity, commitment fee percentage	0.50%	0.50%
Interest expense	$ 36,655	$ 27,996
Amortization of debt issuance costs	1,744	911
Amortization of debt discount (premium)	846	449
Amortization of deferred consideration	190	783
Interest income (expense) other	81	232
Interest expense	39,516	30,371
Repayments of long-term debt	8,925	8,925
November 2013 First Lien
Long-Term Debt [Line Items]
Repayments of long-term debt	$ 2,600	$ 2,600
Senior Notes Due 2024
Long-Term Debt [Line Items]
Interest rate, stated percentage	10.875%	10.875%		10.875%
Minimum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate	6.00%	6.00%
Debt instrument alternate base rate		7.50%
Maximum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate	6.53%	7.75%
Debt instrument alternate base rate		8.50%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2017	Mar. 31, 2016
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	$ 124,383
Stock-based compensation	12,521
Reclassification of stock-compensation liability award	450
Stock option exercises	628
Foreign currency translation adjustment	686	$ 342
Unrealized loss on derivative	(216)	(1,511)
Net (loss) income attributable to non-controlling interest	226	(7,730)
Net loss attributable to Endurance International Group	(35,388)	$ 21,811
Stockholders' equity attributable to parent, ending balance	$ 103,290

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 09, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share)		$ 0.0001		$ 0.0001
Stock-based compensation expense		$ 12,924	$ 18,388
2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		2,100
2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1,200
Percentage of weighted adjusted revenue required to earn performance-based restricted stock awards				50.00%
Percentage of weighted adjusted EBITDA required to earn performance-based restricted stock awards				25.00%
Percentage of weighted adjusted free cash flow required to earn performance-based restricted stock awards				25.00%
Chief Executive Officer | 2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting		0			3,693,754
Vested period of award shares					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
Shares available for grant (in shares)		17,052,912
Stock options, granted (in options)		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]
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
Shares available for grant (in shares)		9,483,732
Common stock, par value (in usd per share)	$ 0.01
Stock options, granted (in options)		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 options)	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	7,362
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
	Mar. 31, 2017	Mar. 31, 2016
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 12,924	$ 18,388
2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	12,924	18,388
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	1,506	770
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	1,854	1,722
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	1,170	764
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	$ 8,394	$ 15,132

Stock-Based Compensation - Su70

Stock-Based Compensation - Summary of Stock Options (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares
2013 Stock Incentive Plan
Stock Options
Stock options, outstanding (in options) | shares	9,607,431
Stock options, granted (in options) | shares	110,433
Stock options, forfeited (in options) | shares	(106,555)
Stock options, expired (in options) | shares	(190,281)
Stock options, outstanding (in options) | shares	9,421,028
Stock options, exercisable (in options) | shares	4,643,602
Stock options, expected to vest after March 31, 2017 (in options) | shares	4,777,426
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in options) | shares	9,421,028
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, forfeited (in usd per share)	12.40
Weighted - average exercise price, expired (in usd per share)	13.10
Weighted - average exercise price, outstanding (in usd per share)	12.74
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	13.21
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	12.28
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 12.74
Weighted - average remaining contractual term, outstanding	7 years 8 months 5 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 5 months 27 days
Weighted - average remaining contractual term, exercisable as of March 31, 2017 and expected to vest thereafter	7 years 8 months 5 days
Estimated fair value of the Company's common stock (in dollars per share)	$ 7.85
2011 Stock Incentive Plan
Stock Options
Stock options, outstanding (in options) | shares	1,931,830
Stock options, granted (in options) | shares	14,724
Stock options, exercised (in options) | shares	(90,320)
Stock options, forfeited (in options) | shares	(128,677)
Stock options, outstanding (in options) | shares	1,727,557
Stock options, exercisable (in options) | shares	552,672
Stock options, expected to vest after March 31, 2017 (in options) | shares	1,174,885
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in options) | shares	1,727,557
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)	6.96
Weighted - average exercise price, forfeited (in usd per share)	9.67
Weighted - average exercise price, outstanding (in usd per share)	8.75
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	7.01
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	9.57
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 8.75
Weighted - average remaining contractual term, outstanding	4 years 10 months 10 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 10 months 10 days
Aggregate intrinsic value, outstanding | $	$ 1,227
Aggregate intrinsic value, exercisable at March 31, 2017 | $	871
Aggregate intrinsic value, expected to vest after March 31, 2017 | $	356
Aggregate intrinsic value, exercisable as of March 31, 2017 and expected to vest thereafter | $	$ 1,227
Estimated fair value of the Company's common stock (in dollars per share)	$ 7.85

Stock-Based Compensation - Su71

Stock-Based Compensation - Summary of Restricted Stock Awards and Restricted Stock Units (Detail) - $ / shares	Feb. 09, 2016	Mar. 31, 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)		(768,386)
Canceled (in RSU's)		(53,535)
Non-vested, ending balance (in RSU's)		6,671,044
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)		8.41
Weighted average grant date fair value, canceled (in usd per share)		12.21
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 13.65
Restricted Stock Units | 2013 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in RSU's)		100,369
Vested (in RSU's)		(30,132)
Non-vested, ending balance (in RSU's)		70,237
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, vested (in usd per share)		12
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 12
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	7,362
Vested (in RSU's)		(145,589)
Canceled (in RSU's)		(90,821)
Non-vested, ending balance (in RSU's)		1,244,607
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)		8.15
Weighted average grant date fair value, vested (in usd per share)		7.69
Weighted average grant date fair value, canceled (in usd per share)		9.67
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 9.39

Accumulated Other Comprehensi72

Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	$ 124,383
Other comprehensive income (loss)	470
Stockholders' equity attributable to parent, ending balance	103,290
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)	686
Stockholders' equity attributable to parent, ending balance	(1,709)
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)	(216)
Stockholders' equity attributable to parent, ending balance	(1,487)
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	$ (3,196)

Redeemable Non-Controlling In73

Redeemable Non-Controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 14, 2016	Jul. 13, 2016	May 16, 2016	Jan. 06, 2016	Jul. 31, 2016	Jan. 31, 2016	Mar. 31, 2017	Jul. 01, 2017	Jul. 14, 2016	Aug. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Accretion in excess of fair value							$ 3,584
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		76.40%	20.00%						10.00%
Payments to acquire business		$ 18,000	$ 15,400		$ 25,000
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

Redeemable Non-controlling In74

Redeemable Non-controlling Interest - Schedule of Change in Redeemable Non-controlling Interest (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance	$ 17,753
Accretion in excess of fair value	3,584
Ending balance	$ 21,337

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Mar. 11, 2015	Nov. 20, 2014	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Feb. 09, 2016
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would impact effective tax rate			$ 0	$ 0
Increase (decrease) in valuation allowance					$ (73,600,000)
Income tax expense (benefit)			5,774,000		(99,902,000)
Deferred federal and state deferred tax expense (benefit)			3,700,000		(29,000,000)
Federal and state current income taxes			1,400,000		2,200,000
Deferred foreign income tax expense (benefit)			(200,000)		(700,000)
Provision for foreign tax			900,000		1,100,000
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)			135,789,327	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
Domestic Tax Authority | Constant Contact, Inc.
Operating Loss Carryforwards [Line Items]
Tax credit carryforward						$ 10,900,000
NOL carry-forward						60,200,000
Federal And State
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance			$ 14,500,000	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
State and Local Jurisdiction | Constant Contact, Inc.
Operating Loss Carryforwards [Line Items]
Tax credit carryforward						9,200,000
NOL carry-forward						$ 32,400,000
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 Cost76

Severance and Other Exit Costs - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2017position	Mar. 31, 2017USD ($)position	Dec. 31, 2014USD ($)position	Dec. 31, 2016USD ($)
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred		$ 4,572,000
Accrued reserve		4,297,000		$ 1,559,000
Payments for restructuring		1,834,000
Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		1,055,000
Accrued reserve		8,766,000		9,020,000
Payments for restructuring		1,497,000
2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			90
Severance costs incurred			$ 2,300,000
2014 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		0
2014 Restructuring Plan | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Future lease payments			3,000,000
Facilities charge		200,000	$ 2,100,000
Payments for restructuring		200,000
Expected cost remaining		200,000
2014 Restructuring Plan | Closing Office Facility in Englewood, Colorado
Restructuring Cost and Reserve [Line Items]
Adjustments relating to lease agreement		$ 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		500,000
Payments for restructuring		1,000,000
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	660
Severance costs incurred		4,500,000
2017 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		3,800,000
Payments for restructuring		700,000
Constant Contact, Inc. | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	35
Email Marketing Unit | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred		2,227,000
Accrued reserve		1,960,000		926,000
Payments for restructuring		1,193,000
Email Marketing Unit | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		1,065,000
Accrued reserve		8,561,000		$ 8,747,000
Payments for restructuring		$ 1,251,000

Severance and Other Exit Cost77

Severance and Other Exit Costs - Summary of Aggregate Activity Related to Company's Facilities Exit Costs Accrual and Severance Accrual (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 9,020
Facility adjustments	1,055
Sublease income received	188
Cash paid	(1,497)
Ending Balance	8,766
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	1,559
Severance charges	4,572
Cash paid	(1,834)
Ending Balance	4,297
Web presence segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance	273
Facility adjustments	(10)
Sublease income received	188
Cash paid	(246)
Ending Balance	205
Web presence segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	633
Severance charges	2,345
Cash paid	(641)
Ending Balance	2,337
Email marketing segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance	8,747
Facility adjustments	1,065
Sublease income received	0
Cash paid	(1,251)
Ending Balance	8,561
Email marketing segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	926
Severance charges	2,227
Cash paid	(1,193)
Ending Balance	$ 1,960

Severance and Other Exit Cost78

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
	Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 5,627	$ 11,416
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	2,743	3,279
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	1,374	3,901
Engineering and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	652	2,018
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 858	$ 2,218

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	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	2
Constant Contact, Inc. | RPost Holdings
Loss Contingencies [Line Items]
Number of defendants		5
Number of patents allegedly infringed | patent		5

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Prepaid expenses and other current assets	$ 33,348		$ 28,678
Amount included in accounts receivable	10,717		13,088
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense	1,800		1,300
Related party transaction expense	3,500	$ 3,600
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense	1,500		1,100
Prepaid expenses and other current assets	100		200
Amount included in accounts receivable	700		$ 600
Related party transaction expense	$ 1,300	$ 1,700

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Revenue	$ (295,137)	$ (237,113)
Sales and marketing	72,772	79,294
Engineering and development	20,362	16,255
General and administrative	39,080	40,279
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Cost of revenue	2,900	3,100
Sales and marketing	100	100
Engineering and development	450	300
General and administrative	50	100
Total related party transaction expense, net	3,500	3,600
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Revenue	(1,100)	(600)
Revenue (contra)	2,200	2,100
Total related party transaction impact to revenue	1,100	1,500
Cost of revenue	200	200
Total related party transaction expense, net	$ 1,300	$ 1,700

Segment Information - Additiona

Segment Information - Additional Information (Details) - Segment	3 Months Ended	12 Months Ended
	Mar. 31, 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
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jul. 14, 2016	May 16, 2016	Jan. 06, 2016	Aug. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 295,137	$ 237,113
Gross Profit	146,388	100,637
Net income (loss)	(31,578)	14,081
Interest expense, net	39,398	30,237
Income tax expense (benefit)	5,774	(99,902)
Depreciation	13,111	13,172
Amortization of other intangible assets	34,267	29,874
Stock-based compensation	12,924	18,388
Restructuring expenses	5,627	11,602
Transaction expenses and charges	580	31,120
Gain of unconsolidated entities	0	(10,727)
Impairment of other long lived assets	0	1,437
Adjusted EBITDA	80,103	39,282
Total assets	2,739,267	2,756,274	$ 2,756,274
Other income		11,400
Loss of unconsolidated entities	0	683
Web Presence Unit
Segment Reporting Information [Line Items]
Revenue	197,348	198,048
Gross Profit	86,616	89,885
Net income (loss)	(23,626)	40,134
Interest expense, net	16,879	17,016
Income tax expense (benefit)	10,551	(84,258)
Depreciation	9,238	8,977
Amortization of other intangible assets	15,905	19,755
Stock-based compensation	11,100	14,647
Restructuring expenses	2,335	171
Transaction expenses and charges	0	30,357
Gain of unconsolidated entities	0	(10,727)
Impairment of other long lived assets	0	1,437
Adjusted EBITDA	42,382	37,509
Total assets	1,476,006	1,523,170
Email Marketing Unit
Segment Reporting Information [Line Items]
Revenue	97,789	39,065
Gross Profit	59,772	10,752
Net income (loss)	(7,952)	(26,053)
Interest expense, net	22,519	13,221
Income tax expense (benefit)	(4,777)	(15,644)
Depreciation	3,873	4,195
Amortization of other intangible assets	18,362	10,119
Stock-based compensation	1,824	3,741
Restructuring expenses	3,292	11,431
Transaction expenses and charges	580	763
Gain of unconsolidated entities	0	0
Impairment of other long lived assets	0	0
Adjusted EBITDA	37,721	1,773
Total assets	$ 1,263,261	$ 1,233,104
WZ (UK) Ltd.
Segment Reporting Information [Line Items]
Ownership interest				86.40%	77.50%	57.50%	49.00%

Subsequent Events Narrative (De

Subsequent Events Narrative (Details) - Chief Executive Officer - Subsequent Event	1 Months Ended
	Apr. 30, 2017USD ($)
Subsequent Event [Line Items]
Base salary	$ 200,000
Salary continuation period	24 months
COBRA coverage period	18 months
Extension of stock option exercise period	1 year
Agreed stock option exercise period	2 years
Restricted Stock Units
Subsequent Event [Line Items]
Holding period	6 months 1 day

Supplemental Guarantor Financ85

Supplemental Guarantor Financial Information - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)guarantor	Mar. 31, 2016USD ($)	Jan. 30, 2017USD ($)	Feb. 29, 2016USD ($)
Guarantor Obligations [Line Items]
Number of guarantors sold | guarantor		2
Proceeds from sale of assets	$ 0		$ 0
10.875% Notes due 2024
Guarantor Obligations [Line Items]
Senior notes				$ 350,000	$ 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	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 68,970	$ 53,596	$ 79,277	$ 33,030
Restricted cash	3,645	3,302
Accounts receivable	10,717	13,088
Prepaid domain name registry fees	56,833	55,444
Prepaid expenses and other current assets	33,348	28,678
Total current assets	173,513	154,108
Intercompany receivables, net	0	0
Property and equipment—net	93,463	95,272
Goodwill	1,860,291	1,859,909
Other intangible assets—net	578,023	612,057
Investment in subsidiaries	0	0
Other assets	33,977	34,928
Total assets	2,739,267	2,756,274	2,756,274
Current liabilities:
Accounts payable	15,817	16,074
Accrued expenses and other current liabilities	87,773	97,858
Deferred revenue	369,240	355,190
Current portion of notes payable	35,700	35,700
Current portion of capital lease obligations	5,165	6,690
Deferred consideration, short-term	4,525	5,273
Total current liabilities	518,220	516,785
Long-term deferred revenue	91,239	89,200
Notes payable	1,944,532	1,951,280
Capital lease obligations—long term	0	512
Deferred consideration, short-term	7,564	7,444
Other long-term liabilities	53,085	48,917
Total liabilities	2,614,640	2,614,138
Redeemable non-controlling interest	21,337	17,753
Equity	103,290	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,739,267	2,756,274
Reportable Legal Entities | Parent
Current assets:
Cash and cash equivalents	84	3	605	12
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	2,270	0
Total current assets	2,354	3
Intercompany receivables, net	29,942	31,665
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	70,606	92,068
Other assets	0	0
Total assets	102,902	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	102,902	123,736
Total liabilities, redeemable non-controlling interest and stockholders’ equity	102,902	123,736
Reportable Legal Entities | Issuer
Current assets:
Cash and cash equivalents	3	4	917,805	67
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	53	81
Total current assets	56	85
Intercompany receivables, net	759,133	799,953
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	1,303,098	1,299,562
Other assets	5,211	5,911
Total assets	2,067,498	2,105,511
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	17,443	27,208
Deferred revenue	0	0
Current portion of notes payable	35,700	35,700
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	53,143	62,908
Long-term deferred revenue	0	0
Notes payable	1,944,532	1,951,280
Capital lease obligations—long term	0	0
Deferred consideration, short-term	0	0
Other long-term liabilities	(783)	(745)
Total liabilities	1,996,892	2,013,443
Redeemable non-controlling interest	0	0
Equity	70,606	92,068
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,067,498	2,105,511
Reportable Legal Entities | Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	52,414	39,034	(852,278)	21,286
Restricted cash	2,619	2,620
Accounts receivable	7,943	10,148
Prepaid domain name registry fees	31,623	31,044
Prepaid expenses and other current assets	19,786	17,996
Total current assets	114,385	100,842
Intercompany receivables, net	(646,213)	(690,761)
Property and equipment—net	80,153	82,901
Goodwill	1,685,980	1,683,121
Other intangible assets—net	559,980	592,095
Investment in subsidiaries	40,678	40,651
Other assets	22,703	23,153
Total assets	1,857,666	1,832,002
Current liabilities:
Accounts payable	13,747	13,801
Accrued expenses and other current liabilities	61,953	60,760
Deferred revenue	307,310	295,208
Current portion of notes payable	0	0
Current portion of capital lease obligations	5,165	6,690
Deferred consideration, short-term	4,485	4,415
Total current liabilities	392,660	380,874
Long-term deferred revenue	80,432	77,649
Notes payable	0	0
Capital lease obligations—long term	0	512
Deferred consideration, short-term	7,539	7,419
Other long-term liabilities	52,601	48,233
Total liabilities	533,232	514,687
Redeemable non-controlling interest	21,337	17,753
Equity	1,303,097	1,299,562
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,857,666	1,832,002
Reportable Legal Entities | Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	16,469	14,555	13,145	11,665
Restricted cash	1,026	682
Accounts receivable	2,774	2,940
Prepaid domain name registry fees	25,368	24,697
Prepaid expenses and other current assets	11,239	10,601
Total current assets	56,876	53,475
Intercompany receivables, net	(142,862)	(140,857)
Property and equipment—net	13,310	12,371
Goodwill	174,311	176,788
Other intangible assets—net	18,043	19,962
Investment in subsidiaries	0	0
Other assets	6,063	5,864
Total assets	125,741	127,603
Current liabilities:
Accounts payable	2,070	2,273
Accrued expenses and other current liabilities	8,377	9,890
Deferred revenue	62,477	60,925
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	40	858
Total current liabilities	72,964	73,946
Long-term deferred revenue	10,807	11,551
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration, short-term	25	25
Other long-term liabilities	1,267	1,429
Total liabilities	85,063	86,951
Redeemable non-controlling interest	0	0
Equity	40,678	40,652
Total liabilities, redeemable non-controlling interest and stockholders’ equity	125,741	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	(158)	(297)
Prepaid expenses and other current assets	0	0
Total current assets	(158)	(297)
Intercompany receivables, net	0	0
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	(1,414,382)	(1,432,281)
Other assets	0	0
Total assets	(1,414,540)	(1,432,578)
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	(547)	(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	(547)	(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	(547)	(943)
Redeemable non-controlling interest	0	0
Equity	(1,413,993)	(1,431,635)
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ (1,414,540)	$ (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
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Revenue	$ 295,137	$ 237,113
Cost of revenue	148,749	136,476
Gross profit	146,388	100,637
Operating expense:
Sales and marketing	72,772	79,294
Engineering and development	20,362	16,255
General and administrative	39,080	40,279
Transactions expenses	580	31,120
Total operating expense	132,794	166,948
Income (loss) from operations	13,594	(66,311)
Interest expense and other income, net	39,398	18,827
Loss before income taxes and equity earnings of unconsolidated entities	(25,804)	(85,138)
Income tax expense (benefit)	5,774	(99,902)
Income (loss) before equity earnings of unconsolidated entities	(31,578)	14,764
Equity loss of unconsolidated entities, net of tax	0	683
Net income (loss)	(31,578)	14,081
Net loss attributable to non-controlling interest	3,810	(7,730)
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(35,388)	21,811
Comprehensive income (loss):
Foreign currency translation adjustment	686	342
Unrealized loss on derivative	(216)	(1,511)
Total comprehensive loss	(34,918)	20,642
Eliminations
Income Statement [Abstract]
Revenue	(1,492)	(333)
Cost of revenue	(1,232)	(570)
Gross profit	(260)	237
Operating expense:
Sales and marketing	(3)	(6)
Engineering and development	0	0
General and administrative	0	0
Transactions expenses	0	0
Total operating expense	(3)	(6)
Income (loss) from operations	(257)	243
Interest expense and other income, net	0	0
Loss before income taxes and equity earnings of unconsolidated entities	(257)	243
Income tax expense (benefit)	0	0
Income (loss) before equity earnings of unconsolidated entities	(257)	243
Equity loss of unconsolidated entities, net of tax	(39,150)	24,600
Net income (loss)	38,893	(24,357)
Net loss attributable to non-controlling interest	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	38,893	(24,357)
Comprehensive income (loss):
Foreign currency translation adjustment	0	0
Unrealized loss on derivative	0	0
Total comprehensive loss	38,893	(24,357)
Parent Company | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0
Cost of revenue	0	0
Gross profit	0	0
Operating expense:
Sales and marketing	0	0
Engineering and development	0	0
General and administrative	0	0
Transactions expenses	0	0
Total operating expense	0	0
Income (loss) from operations	0	0
Interest expense and other income, net	0	0
Loss before income taxes and equity earnings of unconsolidated entities	0	0
Income tax expense (benefit)	0	0
Income (loss) before equity earnings of unconsolidated entities	0	0
Equity loss of unconsolidated entities, net of tax	31,321	(13,839)
Net income (loss)	(31,321)	13,839
Net loss attributable to non-controlling interest	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(31,321)	13,839
Comprehensive income (loss):
Foreign currency translation adjustment	0	0
Unrealized loss on derivative	0	0
Total comprehensive loss	(31,321)	13,839
Issuer | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0
Cost of revenue	0	0
Gross profit	0	0
Operating expense:
Sales and marketing	0	0
Engineering and development	0	0
General and administrative	55	44
Transactions expenses	0	0
Total operating expense	55	44
Income (loss) from operations	(55)	(44)
Interest expense and other income, net	39,246	29,356
Loss before income taxes and equity earnings of unconsolidated entities	(39,301)	(29,400)
Income tax expense (benefit)	(14,517)	(11,216)
Income (loss) before equity earnings of unconsolidated entities	(24,784)	(18,184)
Equity loss of unconsolidated entities, net of tax	6,538	(32,023)
Net income (loss)	(31,322)	13,839
Net loss attributable to non-controlling interest	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(31,322)	13,839
Comprehensive income (loss):
Foreign currency translation adjustment	0	0
Unrealized loss on derivative	(216)	(1,511)
Total comprehensive loss	(31,538)	12,328
Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	262,096	204,069
Cost of revenue	127,892	114,631
Gross profit	134,204	89,438
Operating expense:
Sales and marketing	68,068	54,229
Engineering and development	15,290	12,898
General and administrative	35,671	36,820
Transactions expenses	580	31,099
Total operating expense	119,609	135,046
Income (loss) from operations	14,595	(45,608)
Interest expense and other income, net	147	(10,440)
Loss before income taxes and equity earnings of unconsolidated entities	14,448	(35,168)
Income tax expense (benefit)	19,695	(89,134)
Income (loss) before equity earnings of unconsolidated entities	(5,247)	53,966
Equity loss of unconsolidated entities, net of tax	1,291	21,945
Net income (loss)	(6,538)	32,021
Net loss attributable to non-controlling interest	3,810	(7,730)
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(10,348)	39,751
Comprehensive income (loss):
Foreign currency translation adjustment	0	0
Unrealized loss on derivative	0	0
Total comprehensive loss	(10,348)	39,751
Non-Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	34,533	33,377
Cost of revenue	22,089	22,415
Gross profit	12,444	10,962
Operating expense:
Sales and marketing	4,707	25,071
Engineering and development	5,072	3,357
General and administrative	3,354	3,415
Transactions expenses	0	21
Total operating expense	13,133	31,864
Income (loss) from operations	(689)	(20,902)
Interest expense and other income, net	5	(89)
Loss before income taxes and equity earnings of unconsolidated entities	(694)	(20,813)
Income tax expense (benefit)	596	448
Income (loss) before equity earnings of unconsolidated entities	(1,290)	(21,261)
Equity loss of unconsolidated entities, net of tax	0	0
Net income (loss)	(1,290)	(21,261)
Net loss attributable to non-controlling interest	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(1,290)	(21,261)
Comprehensive income (loss):
Foreign currency translation adjustment	686	342
Unrealized loss on derivative	0	0
Total comprehensive loss	$ (604)	$ (20,919)

Supplemental Guarantor Financ88

Supplemental Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 33,675	$ 11,772
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(881,709)
Cash paid for minority investments	0	(600)
Purchases of property and equipment	(9,258)	(10,140)
Proceeds from sale of property and equipment	251	0
Proceeds from note receivable	0	0
Proceeds from sale of assets	0	0
Purchases of intangible assets	(33)	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	(344)	(737)
Net cash used in investing activities	(9,384)	(893,186)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver	0	1,072,178
Repayment of notes payable and revolver	(8,925)	(91,925)
Payment of financing costs	(92)	(51,605)
Payment of deferred consideration	(818)	(707)
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	(2,037)	(1,439)
Proceeds from exercise of stock options	628	593
Capital investments from minority partner	0	0
Intercompany loans and investments	0	0
Net cash provided by (used in) financing activities	(11,244)	927,095
Net effect of exchange rate on cash and cash equivalents	2,327	566
Net increase in cash and cash equivalents	15,374	46,247
Cash and cash equivalents:
Beginning of period	53,596	33,030
End of period	68,970	79,277
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	(2,271)	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	628	593
Capital investments from minority partner	0	0
Intercompany loans and investments	1,724	0
Net cash provided by (used in) financing activities	2,352	593
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	81	593
Cash and cash equivalents:
Beginning of period	3	12
End of period	84	605
Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(31,803)	(10,910)
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	1,072,178
Repayment of notes payable and revolver	(8,925)	(91,925)
Payment of financing costs	(92)	(51,605)
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	40,819	0
Net cash provided by (used in) financing activities	31,802	928,648
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	(1)	917,738
Cash and cash equivalents:
Beginning of period	4	67
End of period	3	917,805
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	68,103	17,833
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(881,709)
Cash paid for minority investments	0	(600)
Purchases of property and equipment	(8,390)	(7,264)
Proceeds from sale of property and equipment	251	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	(347)
Net cash used in investing activities	(8,139)	(889,920)
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	(38)
Payment of redeemable non-controlling interest liability	0	0
Principal payments on capital lease obligations	(2,037)	(1,439)
Proceeds from exercise of stock options	0	0
Capital investments from minority partner	0	0
Intercompany loans and investments	(44,547)	0
Net cash provided by (used in) financing activities	(46,584)	(1,477)
Net effect of exchange rate on cash and cash equivalents	0	0
Net increase in cash and cash equivalents	13,380	(873,564)
Cash and cash equivalents:
Beginning of period	39,034	21,286
End of period	52,414	(852,278)
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(354)	4,849
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	(868)	(2,876)
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	(33)	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	(344)	(390)
Net cash used in investing activities	(1,245)	(3,266)
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	(818)	(669)
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	2,004	0
Net cash provided by (used in) financing activities	1,186	(669)
Net effect of exchange rate on cash and cash equivalents	2,327	566
Net increase in cash and cash equivalents	1,914	1,480
Cash and cash equivalents:
Beginning of period	14,555	11,665
End of period	$ 16,469	$ 13,145