Endurance International 10-Q 3 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Trading Symbol	EIGI
Entity Registrant Name	Endurance International Group Holdings, Inc.
Entity Central Index Key	1,237,746
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		143,491,288

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 70,521	$ 53,596
Restricted cash	2,647	3,302
Accounts receivable	13,984	13,088
Prepaid domain name registry fees	55,742	55,444
Prepaid expenses and other current assets	29,170	28,678
Total current assets	172,064	154,108
Property and equipment—net	88,557	95,272
Goodwill	1,862,489	1,859,909
Other intangible assets—net	496,036	612,057
Deferred financing costs	3,645	4,932
Investments	15,200	15,900
Prepaid domain name registry fees, net of current portion	10,874	10,429
Other assets	2,204	3,710
Total assets	2,651,099	2,756,274
Current liabilities:
Accounts payable	13,397	16,074
Accrued expenses	75,573	67,722
Accrued interest	14,546	27,246
Deferred revenue	368,613	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	3,166	6,690
Deferred consideration—short term	4,319	5,273
Other current liabilities	3,605	2,890
Total current liabilities	517,164	516,785
Long-term deferred revenue	90,904	89,200
Notes payable—long term, net of original issue discounts of $25,853 and $26,880 and deferred financing costs of $43,342 and $39,194, respectively	1,920,258	1,951,280
Capital lease obligations—long term	1,485	512
Deferred tax liability	46,203	39,943
Deferred consideration—long term	3,493	7,444
Other liabilities	9,889	8,974
Total liabilities	2,589,396	2,614,138
Redeemable non-controlling interest	0	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 138,074,911 shares issued at December 31, 2016 and September 30, 2017, respectively; 134,793,857 and 138,074,911 outstanding at December 31, 2016 and September 30, 2017, respectively	14	14
Additional paid-in capital	917,655	868,228
Accumulated other comprehensive loss	(991)	(3,666)
Accumulated deficit	(854,975)	(740,193)
Total stockholders’ equity	61,703	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ 2,651,099	$ 2,756,274

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Notes payable-long term original issue discounts, net	$ 26,880	$ 25,853
Deferred financing costs	$ 39,194	$ 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)	138,074,911	134,793,857
Common stock, shares outstanding (in shares)	138,074,911	134,793,857

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 295,222	$ 291,193	$ 882,617	$ 819,019
Cost of revenue	158,865	149,427	454,197	438,980
Gross profit	136,357	141,766	428,420	380,039
Operating expense:
Sales and marketing	66,276	75,341	211,154	234,944
Engineering and development	19,882	23,988	60,393	67,930
General and administrative	51,269	33,399	130,929	108,508
Transaction expenses	0	159	773	32,257
Total operating expense	137,427	132,887	403,249	443,639
Income (loss) from operations	(1,070)	8,879	25,171	(63,600)
Other income (expense):
Other income (expense), net	(600)	(4,845)	(600)	6,565
Interest income	203	162	506	438
Interest expense	(35,848)	(41,208)	(121,022)	(112,573)
Total other expense—net	(36,245)	(45,891)	(121,116)	(105,570)
Loss before income taxes and equity earnings of unconsolidated entities	(37,315)	(37,012)	(95,945)	(169,170)
Income tax expense (benefit)	2,982	(7,387)	11,384	(121,220)
Loss before equity earnings of unconsolidated entities	(40,297)	(29,625)	(107,329)	(47,950)
Equity loss (income) of unconsolidated entities, net of tax	(33)	173	(72)	1,197
Net loss	(40,264)	(29,798)	(107,257)	(49,147)
Net (loss) income attributable to non-controlling interest	0	(1,206)	277	(14,326)
Excess accretion of non-controlling interest	0	3,145	7,247	3,145
Total net income (loss) attributable to non-controlling interest	0	1,939	7,524	(11,181)
Net loss attributable to Endurance International Group Holdings, Inc.	(40,264)	(31,737)	(114,781)	(37,966)
Comprehensive income (loss):
Foreign currency translation adjustments	1,070	112	2,984	994
Unrealized gain (loss) on cash flow hedge, net of taxes of $(65) and $48, and $(889) and $(182) for the three and nine months ended September 30, 2016 and 2017, respectively	83	72	(309)	(1,866)
Total comprehensive (loss) income	$ (39,111)	$ (31,553)	$ (112,106)	$ (38,838)
Earnings Per Share, Basic and Diluted
Basic net income (loss) per share (in usd per share)	$ (0.29)	$ (0.24)	$ (0.84)	$ (0.29)
Diluted net income (loss) per share (in usd per share)	$ (0.29)	$ (0.24)	$ (0.84)	$ (0.29)
Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	137,793,609	133,550,168	136,688,115	133,038,542
Weighted average number of diluted shares outstanding (in shares)	137,793,609	133,550,168	136,688,115	133,038,542

Consolidated Statements of Ope5

Consolidated Statements of Operations and Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Unrealized gain (loss) arising during period, tax	$ 48	$ (65)	$ (182)	$ (889)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (107,257)	$ (49,147)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation of property and equipment	40,733	46,942
Amortization of other intangible assets	104,554	105,679
Impairment of long lived assets	13,848	8,285
Impairment of investments	600	0
Amortization of deferred financing costs	5,403	4,322
Amortization of net present value of deferred consideration	504	2,426
Dividend from minority interest	100	50
Amortization of original issue discounts	2,791	2,116
Stock-based compensation	48,749	48,218
Deferred tax (benefit) expense	6,442	(124,547)
Loss on sale of assets	(317)	(168)
Gain from unconsolidated entities	(72)	(6,565)
Loss of unconsolidated entities	0	1,197
Financing costs expensed	5,487	0
Loss on early extinguishment of debt	992	0
Gain from change in deferred consideration	0	(33)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(872)	1,376
Prepaid expenses and other current assets	(510)	(9,206)
Accounts payable and accrued expenses	(7,309)	12,294
Deferred revenue	15,000	58,565
Net cash provided by operating activities	128,866	101,804
Cash flows from investing activities:
Businesses acquired in purchase transactions, net of cash acquired	0	(889,634)
Cash paid for minority investment	0	(5,600)
Purchases of property and equipment	(32,095)	(29,317)
Proceeds from sale of assets	292	242
Purchases of intangible assets	(1,966)	(27)
(Withdrawals) deposits of principal balances in restricted cash accounts	655	(738)
Net cash used in investing activities	(33,114)	(925,074)
Cash flows from financing activities:
Proceeds from issuance of term loan and notes, net of original issue discounts	1,693,007	1,056,178
Repayments of term loans	(1,733,147)	(42,775)
Proceeds from borrowing of revolver	0	49,500
Repayment of revolver	0	(83,000)
Payment of financing costs	(6,304)	(52,561)
Payment of deferred consideration	(5,408)	(43,080)
Payment of redeemable non-controlling interest liability	(25,000)	(33,425)
Principal payments on capital lease obligations	(5,679)	(4,372)
Capital investment from minority partner	0	2,776
Proceeds from exercise of stock options	1,548	2,304
Net cash provided by (used in) financing activities	(80,983)	851,545
Net effect of exchange rate on cash and cash equivalents	2,156	1,843
Net increase in cash and cash equivalents	16,925	30,118
Cash and cash equivalents:
Beginning of period	53,596	33,030
End of period	70,521	63,148
Supplemental cash flow information:
Interest paid	118,276	91,181
Income taxes paid	$ 3,958	$ 3,399

Nature of Business

Nature of Business	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Formation and Nature of Business Endurance International Group Holdings, Inc. (“Holdings”) is a Delaware corporation, which, together with its wholly owned subsidiary company, EIG Investors Corp. (“EIG Investors”), its primary operating subsidiary company, The Endurance International Group, Inc. (“EIG”), and other subsidiary companies of EIG, collectively form the “Company.” The Company is a leading provider of cloud-based platform solutions designed to help small- and medium-sized businesses succeed online. EIG and EIG Investors were incorporated in April 1997 and May 2007, respectively, and Holdings was originally formed as a limited liability company in October 2011 in connection with the acquisition by investment funds and entities affiliated with Warburg Pincus and Goldman, Sachs & Co. on December 22, 2011 of a controlling interest in EIG Investors, EIG and EIG’s subsidiary companies. On November 7, 2012, Holdings reorganized as a Delaware limited partnership and on June 25, 2013, Holdings converted into a Delaware C-corporation and changed its name to Endurance International Group Holdings, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions were eliminated on consolidation. Segment Information The Company has reviewed the criteria of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 280-10, Segment Reporting , and determined that the Company is comprised of two segments for reporting purposes: web presence and email marketing. The web presence segment consists predominantly of the Company's web hosting brands and related products such as domain names, website security tools, website design tools and services, ecommerce tools and other services designed to grow the online presence of a small business. The email marketing segment consists of Constant Contact email marketing tools and the SinglePlatform digital storefront product, both of which the Company acquired in the February 2016 acquisition of Constant Contact, Inc. ("Constant Contact"). The Company has experienced a number of changes in its management structure during 2017, including a change in its chief executive officer. The Company considers the chief executive officer to be the Chief Operating Decision Maker, or CODM, for purposes of assessing reportable segments and reporting units. The new CODM is undertaking an assessment of the management and financial reporting structure of the Company and expects to make changes to that structure during the fourth quarter of 2017. These changes may impact the number and makeup of the Company's segments for reporting purposes. 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 September 30, 2017 , and the related consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2016 and 2017 , cash flows for the nine months ended September 30, 2016 and 2017 , and the notes to consolidated financial statements are unaudited. These unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements. The unaudited consolidated financial statements include, in the opinion of management, all adjustments, consisting only of normal recurring adjustments that are necessary for a fair presentation of the Company’s financial position at September 30, 2017 , results of operations for the three and nine months ended September 30, 2016 and 2017 and cash flows for the nine months ended September 30, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive loss are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2017 . Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable. Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period. Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging, or ASC 815, provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in FASB Accounting Standards Update ("ASU") 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, Internal-Use Software. Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable. The Company capitalized internal-use software development costs of $2.9 million and $9.3 million , respectively, during the three and nine months ended September 30, 2016 , and $2.2 million and $8.4 million , respectively, during the three and nine months ended September 30, 2017 . Goodwill Goodwill relates to amounts that arose in connection with the Company’s various business combinations and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, including a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. Additionally, the reorganization or change in the number of reporting units could result in the reassignment of goodwill between reporting units and may trigger an impairment assessment. In accordance with ASC 350, Intangibles—Goodwill and Other , or ASC 350, the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. Under U.S. GAAP, a reporting unit is either the equivalent of, or one level below, an operating segment. As of December 31, 2016, the Company determined it operates in two segments and that each segment is its own reporting unit, and as such, the Company has two reporting units, email marketing and web presence. The provisions of ASC 350 require that a two-step impairment test be performed for goodwill. In the first step, the Company compares the fair value of its reporting unit to which goodwill has been allocated to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. As of December 31, 2016, the Company determined fair values for each of the reporting units based on consideration of the income approach, the market comparable approach and the market transaction approach. For purposes of the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses its internal forecasts to estimate future after-tax cash flows and include an estimate of long-term future growth rates based on its most recent views of the long-term outlook for each reporting unit. Actual results may differ from those assumed in our forecasts. The Company derived its discount rates using the weighted average cost of capital, using betas observed in its industry and published rates for industries relevant to our reporting units. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the respective business and its internally developed forecasts. Discount rates used in the Company's reporting unit valuations ranged from 11.0% to 12.0% . For purposes of the market approach, the Company uses a valuation technique in which values are derived based on market prices of comparable publicly traded companies. The Company also uses a market based valuation technique in which values are determined based on relevant observable information generated by market transactions involving comparable businesses. The Company assesses each valuation methodology based upon the relevance and availability of the data at the time it performs the valuation and weights the methodologies appropriately. The carrying values of the reporting units were determined through specific allocation of assets and liabilities to the reporting units, and an apportionment method relating to our debt, whereby debt that was incurred in order to finance the acquisition of assets or businesses of a reporting unit was allocated to that reporting unit. In prior years, the Company had only one reporting unit. Subsequent to the acquisition of Constant Contact, and as described in Note 19: Segment Information , the Company determined that there is a second reporting unit relating to email marketing. The Company has allocated the fair value of the goodwill acquired through its acquisitions to the applicable reporting unit, and allocated the fair value of the goodwill acquired through its acquisition of Constant Contact to its email marketing reporting unit. As of the Company's assessment date for 2016, the estimated fair values of its reporting units exceeded their carrying values and the Company concluded, based on the first step of the process, that no impairment existed as of that date in either of its reporting units. As of September 30, 2017, the Company did not have a reporting unit for which it is reasonably likely that it will fail step one of a goodwill impairment test in the near term. However, if macroeconomic conditions worsen, the Company's current financial projections are not achieved, or the Company reorganizes or changes the number of its reporting units, it is possible that the Company may experience impairments for some of its intangible assets, which may require it to recognize impairment charges. As of December 31, 2016 , the carrying value of goodwill that was allocated to the email marketing reporting unit and the web presence reporting unit was $604.3 million and $1,255.6 million , respectively. As of December 31, 2016, the fair value of the web presence segment exceeded the carrying value of its net assets by 67% and the fair value of the email marketing segment exceeded the carrying value of its net assets by 35% . As of September 30, 2017 , the carrying value of goodwill that was allocated to the email marketing reporting unit and the web presence reporting unit was $604.3 million and $1,258.2 million , respectively. The Company had goodwill of $1.9 billion as of December 31, 2016 and September 30, 2017 , and no impairment charges have been recorded to date. The Company has experienced a number of changes in its management structure during 2017, including a change in its chief executive officer. The Company considers the chief executive officer to be the Chief Operating Decision Maker, or CODM, for purposes of assessing reportable segments and reporting units. The new CODM is undertaking an assessment of the management and financial reporting structure of the Company and expects to make changes to that structure during the fourth quarter of 2017. These changes may impact the number and makeup of the Company's reporting units. In accordance with ASC 350, if the Company changes its reporting units, goodwill will be reallocated to the newly identified reporting units. 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. During the three and nine months ended September 30, 2017, the Company recognized an impairment charge of $13.8 million relating to certain domain name intangible assets acquired in 2014, which was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with this intangible asset. During the nine months ended September 30, 2016, the Company determined that a portion of an internally developed software tool would not meet its needs following the acquisition of Constant Contact, resulting in an impairment charge of $2.0 million which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Additionally, during the nine months ended September 30, 2016, the Company recognized an impairment charge of $4.9 million relating to internally developed software and developed technology relating to Webzai Ltd. (“Webzai”) acquisition, which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. In total, during the nine months ended September 30, 2016, the Company incurred impairment charges of $8.3 million , which includes the $2.0 million charge to abandon a portion of the internally developed software tool and a $4.9 million charge relating to the Webzai software and developed technology, both mentioned above, and a charge of $1.4 million to impair certain acquired IPR&D projects from the Webzai acquisition that were abandoned during the three months ended March 31, 2016. 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 nine months ended September 30, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired as these projects were abandoned during the three months ended March 31, 2016. At that time, the Company recorded a $ 1.4 million impairment charge, which is reflected in engineering and development expense in the Company’s consolidated statements of operations and comprehensive loss. No such impairment loss was identified during the nine months ended September 30, 2017 . Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period, whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of FASB ASU No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force, and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, and other cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The Company analyzes the selling prices used in its allocation of transaction amount, at a minimum, on a quarterly basis. Selling prices are analyzed on a more frequent basis if a significant change in the business necessitates a more timely analysis. The Company maintains a reserve for refunds and chargebacks related to revenue that has been recognized and is expected to be refunded. The Company had a refund and chargeback reserve of $0.6 million and $0.5 million as of December 31, 2016 and September 30, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and September 30, 2017 was $2.1 million and $2.0 million , respectively. Based on refund history, approximately 84% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 95% of all refunds happen within 45 days of the contract start or renewal date. Income Taxes Income taxes are accounted for in accordance with ASC 740, Accounting for Income Taxes , or ASC 740. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. ASC 740 clarifies the accounting for income taxes by prescribing a minimum recognition threshold that a tax position is required to meet before being recognized in the financial statements. The Company recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is more likely than not to be realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. There were nonrecognized tax benefits in the three and nine months ended September 30, 2016 and 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. During the three and nine months ended September 30, 2016 , the Company did not incur any interest and penalties related to unrecognized tax benefits. During the three and nine months ended September 30, 2017 , the Company recognized $0.1 million in interest and $0.1 million in penalties related to unrecognized tax benefits. Stock-Based Compensation The Company may issue restricted stock units, restricted stock awards and stock options which vest upon the satisfaction of a performance condition and/or a service condition. The Company follows the provisions of ASC 718, Compensation—Stock Compensation , or ASC 718, which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods, net of estimated forfeitures. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. In addition, for stock-based awards where vesting is dependent upon achieving certain performance goals, the Company estimates the likelihood of achieving the performance goals against established performance targets. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards granted, the Company estimates the fair value of each restricted stock award based on the closing trading price of its common stock on the date of grant. Net Loss per Share The Company considered ASC 260-10, Earnings per Share , or ASC 260-10, which requires the presentation of both basic and diluted earnings per share in the consolidated statements of operations and comprehensive loss. The Company’s basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period, and, if there are dilutive securities, diluted income per share is computed by including common stock equivalents which includes shares issuable upon the exercise of stock options, net of shares assumed to have been purchased with the proceeds, using the treasury stock method. Three Months Ended Nine Months Ended 2016 2017 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net loss attributable to Endurance International Group Holdings, Inc. $ (31,737 ) $ (40,264 ) $ (37,966 ) $ (114,781 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net loss per share attributable to Endurance International Group Holdings, Inc. $ (0.24 ) $ (0.29 ) $ (0.29 ) $ (0.84 ) Diluted net loss per share attributable to Endurance International Group Holdings, Inc. $ (0.24 ) $ (0.29 ) $ (0.29 ) $ (0.84 ) Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.: Basic 133,550,168 137,793,609 133,038,542 136,688,115 Diluted 133,550,168 137,793,609 133,038,542 136,688,115 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 September 30, Nine Months Ended September 30, 2016 2017 2016 2017 (unaudited) Restricted stock awards and units 9,554,260 7,782,806 8,605,808 6,974,708 Options 12,050,726 10,593,596 10,673,967 10,947,661 Total 21,604,986 18,376,402 19,279,775 17,922,369 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 a

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions The Company accounts for the acquisitions of businesses using the purchase method of accounting. The Company allocates the purchase price to the tangible and identifiable intangible assets and liabilities assumed based on their estimated fair values. Purchased identifiable intangible assets typically include subscriber relationships, trade names, domain names held for sale, developed technology and IPR&D. The methodologies used to determine the fair value assigned to subscriber relationships and domain names held for sale are typically based on the excess earnings method that considers the return received from the intangible asset and includes certain expenses and also considers an attrition rate based on the Company’s internal subscriber analysis and an estimate of the average life of the subscribers. The fair value assigned to trade names is typically based on the income approach using a relief from royalty methodology that assumes that the fair value of a trade name can be measured by estimating the cost of licensing and paying a royalty fee for the trade name that the owner of the trade name avoids. The fair value assigned to developed technology typically uses the cost approach. The fair value assigned to IPR&D is based on the cost approach. If applicable, the Company estimates the fair value of contingent consideration payments in determining the purchase price. The contingent consideration is then adjusted to fair value in subsequent periods as an increase or decrease in current earnings in general and administrative expense in the consolidated statements of operations and comprehensive loss. Constant Contact, Inc. On February 9, 2016, the Company acquired all of the outstanding shares of common stock of Constant Contact for $ 32.00 per share in cash, for a total purchase price of approximately $ 1.1 billion . Constant Contact is a leading provider of online marketing tools that are designed for small organizations, including small businesses, associations and non-profits. The aggregate purchase price of $ 1.1 billion , which was paid in cash at the closing, was allocated to intangible assets consisting of subscriber relationships, developed technology and trade names of $ 263.0 million , $ 83.0 million and $ 52.0 million , respectively, goodwill of $ 604.3 million , property and equipment of $ 39.6 million , and working capital of $ 184.2 million , offset by a net deferred tax liability of $ 125.1 million and deferred revenue of $ 25.2 million . The goodwill reflects the value of expected synergies. Goodwill related to the acquisition, which is included in the Company’s email marketing reporting unit, is not deductible for tax purposes. Summary of Deferred Consideration Related to Acquisitions Components of short-term and long-term deferred consideration as of December 31, 2016 and September 30, 2017 , consisted of the following: December 31, 2016 September 30, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — — — Social Booster (Acquired in 2016) 40 25 25 — AppMachine (Acquired in 2016) 4,365 7,419 4,294 3,493 Total $ 5,273 $ 7,444 $ 4,319 $ 3,493

Property and Equipment and Capi

Property and Equipment and Capital Lease Obligations	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment and Capital Lease Obligations	Property and Equipment and Capital Lease Obligations Components of property and equipment consisted of the following: December 31, 2016 September 30, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 6,242 Software 52,130 67,987 Computers and office equipment 143,091 148,460 Furniture and fixtures 10,892 10,840 Leasehold improvements 21,244 22,202 Construction in process 6,691 10,579 Property and equipment—at cost 240,355 267,100 Less accumulated depreciation (145,083 ) (178,543 ) Property and equipment—net $ 95,272 $ 88,557 Depreciation expense related to property and equipment for the three months ended September 30, 2016 and 2017 was $17.0 million and $13.6 million , respectively. Depreciation expense related to property and equipment for the nine months ended September 30, 2016 and 2017 was $46.9 million and $40.7 million , respectively. Property under capital lease with a cost basis of $ 24.6 million was included in software as of September 30, 2017 . The net carrying value of property under capital lease as of September 30, 2017 was $ 4.4 million .

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following valuation hierarchy is used for disclosure of the valuation inputs used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2 inputs are quoted prices for similar assets or liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. • Level 3 inputs are unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. As of December 31, 2016 and September 30, 2017 , the Company’s financial assets or liabilities required to be measured on a recurring basis are accrued earn-out consideration payable in connection with the 2012 acquisition of certain assets of Mojoness, Inc., or Mojo, and the 2015 interest rate cap. The Company has classified its interest rate cap discussed in Note 6 below within Level 2 of the fair value hierarchy. The Company has classified its liabilities for contingent earn-out consideration related to Mojo within Level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which include probability weighted cash flows. During the nine months ended September 30, 2017 , the Company paid $0.8 million related to the earn-out provisions for the Mojo acquisition, which constituted the final payment for this acquisition. Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration (included in deferred consideration) $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at September 30, 2017 Financial assets: Interest rate cap (included in other assets) $ 187 — $ 187 $ — Total financial assets $ 187 $ — $ 187 $ — The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of September 30, 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2016 $ 818 Payment of contingent earn-outs related to 2012 acquisition (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at September 30, 2017 $ —

Derivatives and Hedging Activit

Derivatives and Hedging Activities	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Risk Management Objective of Using Derivatives The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and the use of derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings. Cash Flow Hedges of Interest Rate Risk The Company entered into a three -year interest rate cap on December 9, 2015 as part of its risk management strategy. The objective of the interest rate cap, designated as a cash flow hedge, involves the receipt of variable amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium. Therefore, this derivative limits the Company’s exposure if the rate rises, but also allows the Company to benefit when the rate falls. The effective portion of changes in the fair value of derivatives that qualify as cash flow hedges is recorded in Accumulated Other Comprehensive Income ("AOCI"), and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Any ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. There was no ineffectiveness recorded in earnings for the three and nine months ended September 30, 2017 . As of September 30, 2017 , the Company had one interest rate cap with $500.0 million notional value outstanding that was designated as a cash flow hedge of interest rate risk. The fair value of the interest rate contract included in other assets on the consolidated balance sheet as of September 30, 2017 was $0.2 million , and the Company recognized $0.2 million and $0.3 million of interest expense in the Company’s consolidated statement of operations for the three and nine months ended September 30, 2017 , respectively. The Company recognized a $0.3 million loss, net of a tax benefit of $(0.2) million , in AOCI for the nine months ended September 30, 2017 . The Company estimates that a cumulative amount of $1.6 million will be reclassified from AOCI to interest expense (as an increase to interest expense) in the next twelve months.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table summarizes the changes in the Company’s goodwill balances from December 31, 2016 to September 30, 2017 for the Company’s two reporting units: Web Presence Unit Email Marketing Unit Total Amount Amount Amount (in thousands) (in thousands) (in thousands) Goodwill balance at December 31, 2016 $ 1,255,604 $ 604,305 $ 1,859,909 Goodwill related to 2016 acquisitions — — — Foreign translation impact 2,580 — 2,580 Goodwill balance at September 30, 2017 $ 1,258,184 $ 604,305 $ 1,862,489 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 nine months ended September 30, 2016 , the Company wrote-off acquired in-process research and development of $ 1.4 million related to its acquisition of Webzai in 2014, as the Company had abandoned certain research and development projects in favor of other projects in the quarter ended March 31, 2016, when these projects were abandoned. Additionally, during the nine months ended September 30, 2016 , the Company recorded an impairment charge of $4.4 million relating to developed technology from the Webzai acquisition, after evaluating it for impairment in accordance with ASC 350. During the three and nine months ended September 30, 2017, the Company wrote down intellectual property, specifically, certain domain names that generated domain monetization revenue, to fair value and recorded a charge of $13.8 million which is included in cost of revenue. The impairment resulted from diminishing cash flows associated with these assets. At September 30, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,858 $ 137,578 $ 148,280 7 years Subscriber relationships 659,754 408,979 250,775 7 years Trade-names 134,056 68,288 65,768 8 years Intellectual property 34,315 26,670 7,645 5 years Domain names available for sale 30,362 6,794 23,568 Indefinite Leasehold interests 314 314 — 1 year Total September 30, 2017 $ 1,144,659 $ 648,623 $ 496,036 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 $38.0 million and $35.3 million for the three months ended September 30, 2016 and 2017 , respectively. The Company’s amortization expense is included in cost of revenue in the aggregate amounts of $105.7 million and $104.6 million for the nine months ended September 30, 2016 and 2017 , respectively.

Investments

Investments	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments As of December 31, 2016 and September 30, 2017 , the Company’s carrying value of investments in privately-held companies was $15.9 million and $15.2 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 September 30, 2016 and 2017 , the Company purchased $ 0.4 million and $ 0.4 million , respectively, of products and services from BlueZone, which is included in cost of revenue in the Company’s consolidated statements of operations and comprehensive loss. As of December 31, 2016 and September 30, 2017 , $ 0.1 million and $ 0.2 million , respectively, relating to the Company’s investment in BlueZone was included in accounts payable and accrued expense in the Company’s consolidated balance sheet. As of December 31, 2016 and September 30, 2017 , $ 0.0 million and $ 0.8 million , respectively, relating to the Company’s investment in BlueZone was included in prepaid expenses in the Company’s consolidated balance sheet. In May 2014, the Company made a strategic investment of $ 15.0 million in Automattic, Inc. (“Automattic”), which provides content management systems associated with WordPress. The investment represents less than 5% of the outstanding shares of Automattic and better aligns the Company with an important partner. In August 2014, the Company made an aggregate investment of $ 3.9 million for a joint venture with a 49% ownership interest in WZ (UK) Ltd ("WZ UK"), which is a provider of technology, sales and marketing services associated with web builder solutions. On January 6, 2016, the Company exercised an option to increase its stake in WZ UK from 49% to 57.5% . Refer to Note 14 : Redeemable Non-controlling Interest , for further details. In December 2014, the Company made an aggregate investment of $ 15.2 million to acquire a 40% ownership interest in AppMachine B.V. (“AppMachine”), which is a developer of software that allows users to build mobile applications for smart devices such as phones and tablets. The Company acquired the remaining 60% of AppMachine on July 27, 2016. On March 3, 2016, the Company purchased a $ 0.6 million convertible promissory note from a business that provides web and mobile money management solutions, with the potential for subsequent purchases of additional convertible notes. During the three months ended September 30, 2017, the Company recognized an impairment expense of $0.6 million in other expense in the consolidated statement of operations and comprehensive loss, as the carrying amount of the investment was deemed unrecoverable. On April 8, 2016, the Company made an investment of $ 5.0 million for a 33% equity interest in Fortifico Limited, a company providing a billing, CRM, and affiliate management solution to small and mid-sized businesses. During the year ended December 31, 2016, the Company incurred a charge of $4.7 million to impair the Company's 33% equity interest in Fortifico Limited, after determining that there were diminishing projected future cash flows on this investment. Investments in which the Company’s interest is less than 20% and which are not classified as available-for-sale securities are carried at the lower of cost or net realizable value unless it is determined that the Company exercises significant influence over the investee company, in which case the equity method of accounting is used. For those investments in which the Company’s voting interest is between 20% and 50% , the equity method of accounting is used. Under this method, the investment balance, originally recorded at cost, is adjusted to recognize the Company’s share of net earnings or losses of the investee company, as they occur, limited to the extent of the Company’s investment in, advances to and commitments for the investee. These adjustments are reflected in equity (income) loss of unconsolidated entities, net of tax in the Company’s consolidated statements of operations and comprehensive loss. The Company recognized net losses of $0.2 million and $0.0 million for the three months ended September 30, 2016 and 2017 , respectively, and net loss (gain) of $1.2 million and $(0.1) million for the nine months ended September 30, 2016 and 2017 , respectively. From time to time, the Company may make new and follow-on investments and may receive distributions from investee companies. As of September 30, 2017 , the Company was not obligated to fund any follow-on investments in these investee companies. As of September 30, 2017 , the Company did not have an equity method investment in which the Company’s proportionate share of the investees’ net income or loss exceeded 10% of the Company’s consolidated assets or income from continuing operations.

Notes Payable

Notes Payable	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Notes Payable	Notes Payable At December 31, 2016 and September 30, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: At December 31, 2016 At September 30, 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,625,746 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Notes 326,480 328,457 Revolving credit facilities — — Total notes payable 1,986,980 1,954,203 Current portion of notes payable 35,700 33,945 Notes payable - long term $ 1,951,280 $ 1,920,258 2017 First Lien Term Loan Facility In connection with the Company's June 14, 2017 refinancing of its then-outstanding term loans (the "2017 Refinancing"), the Company entered into its current first lien term loan facility (the "2017 First Lien") with an original balance of $1,697.3 million and a maturity date of February 9, 2023. As of September 30, 2017 , the 2017 First Lien had an outstanding balance of: At September 30, 2017 (in thousands) 2017 First Lien Term Loan $ 1,670,277 Unamortized deferred financing costs (23,483 ) Unamortized original issue discount (21,048 ) Net 2017 First Lien Term Loan 1,625,746 Current portion of 2017 First Lien Term Loan (33,945 ) 2017 First Lien Term Loan - long term $ 1,591,801 The 2017 First Lien was issued at a price of 99.75% of par and automatically bears interest at the bank’s reference rate unless the Company gives notice to opt for LIBOR-based interest rate term loans. The interest rate for a LIBOR-based interest term loan is 4.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan is 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . The 2017 First Lien requires quarterly mandatory repayments of principal. During the nine months ended September 30, 2017, the Company made two mandatory repayments of $8.5 million each, and two voluntary prepayments for a total of $10.0 million . Interest is payable on maturity of the elected interest period for a LIBOR-based interest 2017 First Lien loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate interest 2017 First Lien loan. 2013 First Lien Term Loan Facility The Company had a prior first lien term loan facility (the “2013 First Lien”) that originated in November 2013 with an original balance of $1,050.0 million and a maturity date of November 9, 2019. As of December 31, 2016 and September 30, 2017 , the 2013 First Lien had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ — The 2013 First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR based interest rate term loans. Prior to February 9, 2016, the interest rate for a LIBOR based interest term loan was 4.00% plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . The 2013 First Lien bore interest at a LIBOR-based rate of 5.00% during this period. In connection with the Company's February 9, 2016 acquisition of Constant Contact and the related financing of that transaction (the "Constant Contact Financing"), the applicable margin for a LIBOR based 2013 First Lien loan increased to 5.23% per annum starting on February 9, 2016 and to 5.48% per annum starting on February 28, 2016. The applicable margin on a reference rate 2013 First Lien loan increased to 4.23% per annum starting on February 9, 2016 and to 4.48% per annum starting on February 28, 2016. The 2013 First Lien required quarterly mandatory repayments of principal, and as a result of the Constant Contact Financing, the Company was obligated to use commercially reasonable efforts to make voluntary repayments on the 2013 First Lien to effectively double the amount of each scheduled amortization payment under this facility. During the nine months ended September 30, 2017, the Company made mandatory repayments of $2.6 million and voluntary prepayments of $2.6 million against the 2013 First Lien prior to the 2017 Refinancing. Interest was payable on maturity of the elected interest period for a LIBOR-based 2013 First Lien loan, which could be one, two, three or six months. Interest was payable at the end of each fiscal quarter for a reference rate 2013 First Lien loan. As part of the 2017 Refinancing, the Company refinanced the then-outstanding 2013 First Lien balance of $980.6 million . Incremental First Lien Term Loan Facility In connection with the Constant Contact Financing, the Company entered into an incremental first lien term loan facility (the “Incremental First Lien”) with an original balance of $735.0 million and a maturity date of February 9, 2023. As of December 31, 2016 and September 30, 2017 , the Incremental First Lien had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issuance discount (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — The Incremental First Lien was issued at a price of 97.0% of par (subject to the payment of an additional upfront fee of 1.0% on February 28, 2016) and had scheduled principal payments equal to 0.50% of the original principal per quarter, or $3.7 million , starting September 30, 2016. The Incremental First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR-based interest rate term loans. Interest was payable on maturity of the elected interest period for a LIBOR-based interest loan, which could be one, two, three or six months. Interest was payable at the end of each fiscal quarter for a reference rate loan term loan. The interest rate for a LIBOR-based interest term loan was 5.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 4.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . During the nine months ended September 30, 2017, the Company made $3.7 million in mandatory prepayments against the Incremental First Lien prior to the 2017 Refinancing. As part of the 2017 Refinancing, the Company refinanced the then-outstanding Incremental First Lien balance of $716.6 million . Revolving Credit Facility The Company had a revolving credit facility of $125.0 million (the “Prior Revolver”) that originated in November 2013 and had a maturity date of December 22, 2016. The Company could elect to draw down against the Prior Revolver using a LIBOR-rate interest loan or an alternate base rate interest loan. The interest rate for an alternate base rate revolver loan was 5.25% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.50% . The interest rate for a LIBOR based revolver loan was 6.25% per annum plus the greater of an adjusted LIBOR and 1.50% . There was also a non-refundable fee (the "commitment fee"), equal to 0.50% of the daily unused principal amount of the revolver payable in arrears on the last day of each fiscal quarter. In connection with the Constant Contact Financing, the Company entered into a new revolving credit facility (the “Current Revolver”), which increased the Company’s available revolving credit to $165.0 million and extended the maturity date to February 9, 2021. The Current Revolver had a "springing" maturity date of August 10, 2019, which is no longer applicable as a result of the 2017 Refinancing. As of December 31, 2016 and September 30, 2017, the Company did not have any balances outstanding under the Current Revolver, and the full amount of the facility, or $165.0 million , was unused and available. The Company has the ability to draw down against the Current Revolver using a LIBOR-based interest loan or an alternate based interest loan. LIBOR-based interest revolver loans bear interest at a rate of 4.0% per annum (subject to a leverage-based step-down) plus an adjusted LIBOR for a selected interest period. Alternate base interest revolver loans bear interest at 3.0% (subject to a leverage-based step down) plus the greatest of the prime rate, the federal funds rate plus 0.50% and an adjusted LIBOR or a one-month interest period plus 1.00% . There is also a non-refundable commitment fee, equal to 0.50% of the daily unused principal amount (subject to a leverage-based step down), which is payable in arrears on the last day of each fiscal quarter. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate revolver loan. Senior Notes In connection with the Constant Contact Financing, EIG Investors issued $350.0 million aggregate principal amount of senior notes (the "Notes") with a maturity date of February 1, 2024. The Notes were issued at a price of 98.065% of par and bear interest at the rate of 10.875% per annum. The Notes have been fully and unconditionally guaranteed, on a senior unsecured basis, by the Company and its subsidiaries that guarantee the 2017 First Lien and the Current Revolver (collectively with the Company's previously existing facilities, the "Senior Credit Facilities") (including Constant Contact and certain of its subsidiaries). As of December 31, 2016 and September 30, 2017 , the Notes had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (15,711 ) Unamortized original issuance discount (6,282 ) (5,832 ) Net Senior Notes 326,480 328,457 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 328,457 Interest on the Notes is payable twice a year, on August 1 and February 1. On January 30, 2017, the Company completed a registered exchange offer for the Notes, as required under the registration rights agreement it entered into with the initial purchasers of the Notes. All of the $350.0 million aggregate principal amount of the original notes was validly tendered for exchange as part of this exchange offer. Presentation of Debt Issuance Costs The Company adopted ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, beginning on January 1, 2016, and retrospectively for all periods presented. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Unamortized balances of deferred financing costs and original issue discounts relating to the term loans and the Notes are presented as a reduction of the notes payable in the Company's consolidated balance sheets. The unamortized value of deferred financing costs associated with the Company's revolving credit facility were not affected by the ASU and continue to be presented as an asset on the Company’s consolidated balance sheets. Maturity of Notes Payable The maturity of the notes payable at September 30, 2017 is as follows: Amounts maturing in: (in thousands) (Remainder of) 2017 $ 8,486 2018 33,945 2019 33,945 2020 33,945 2021 33,945 Thereafter 1,876,011 Total $ 2,020,277 Interest The Company recorded $41.2 million and $35.8 million in interest expense for the three months ended September 30, 2016 and 2017 , respectively, and $112.6 million and $121.0 million , for the nine months ended September 30, 2016 and 2017 , respectively. The following table provides a summary of interest rates and interest expense for the three and nine months ended September 30, 2016 and 2017 : Three Months Ended September 30, 2016 Three Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2017 (percentage per annum) Interest rate—LIBOR 4.49%-6.48% 5.14%-5.32% 4.49%-7.75% 5.14%-6.68% Interest rate—reference 6.50% * 6.50%-8.75% * Interest rate—Senior Notes 10.875 % 10.875 % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % 0.50 % (dollars in thousands) Interest expense and service fees $ 37,603 $ 32,551 $ 103,111 $ 105,371 Loss on extinguishment of debt — — — 992 Deferred financing fees immediately expensed — — — 5,487 Amortization of deferred financing fees 1,760 1,873 4,322 5,403 Amortization of original issue discounts 844 1,059 2,116 2,791 Amortization of net present value of deferred consideration 844 127 2,426 504 Other interest expense 157 238 598 474 Total interest expense $ 41,208 $ 35,848 $ 112,573 $ 121,022 * The Company did not have debt bearing interest based on the reference rate for the three months and nine months ended September 30, 2017. The Company concluded that the 2017 Refinancing was primarily a debt modification of the existing term loans in accordance with ASC 470-50, Debt: Modifications and Extinguishments, with extinguishment relating only to a few existing lenders that did not participate in the 2017 Refinancing. As a result, the Company capitalized $4.2 million of additional original issue discounts ("OID") and $0.9 million of deferred financing costs related to new lenders participating in the 2017 First Lien. These capitalized costs will be amortized over the remaining life of the loan using the effective interest method. Additionally, the Company recorded a charge during the nine months ended September 30, 2017, included in interest expense, of $1.0 million to write off OID and deferred financing costs related to the refinanced debt for lenders not participating in the 2017 First Lien. Lastly, the Company recorded a charge of $5.5 million for the nine months ended September 30, 2017, included in interest expense, for deferred financing costs incurred for the 2017 First Lien that related to existing lenders that carried over from the refinanced debt. Debt Covenants The Senior Credit Facilities require that the Company complies with a financial covenant to maintain a maximum ratio of consolidated senior secured net indebtedness to an adjusted consolidated EBITDA measure. The Senior Credit Facilities also contain covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge, sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. These covenants are subject to a number of important limitations and exceptions. Additionally, the Senior Credit Facilities require the Company to comply with certain negative covenants and specify certain events of default that could result in amounts becoming payable, in whole or in part, prior to their maturity dates. With the exception of certain equity interests and other excluded assets under the terms of the Senior Credit Facilities, substantially all of the Company's assets are pledged as collateral for the obligations under the Senior Credit Facilities. The indenture with respect to the Notes contains covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. Upon a change of control as defined in the indenture, the Company must offer to repurchase the Notes at 101% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, up to, but not including, the repurchase date. These covenants are subject to a number of important limitations and exceptions. The indenture also provides for events of default, which, if any of them occurs, may permit or, in certain circumstances, require the principal, premium, if any, interest and any other monetary obligations on all the then outstanding Notes to be due and payable immediately. The Company was in compliance with all covenants at September 30, 2017.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Voting Rights All holders of common stock are entitled to one vote per share. The following table presents the changes in total stockholders’ equity: Total Stockholders’ Equity (in thousands) Balance at December 31, 2016 $ 124,383 Stock-based compensation 47,151 Reclassification of stock-compensation liability award 450 Stock option exercises 1,548 Foreign currency translation adjustment 2,984 Unrealized loss on derivative (309 ) Net loss attributable to non-controlling interest 277 Net loss attributable to Endurance International Group Holdings, Inc. (114,781 ) Balance at September 30, 2017 $ 61,703

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation 2013 Stock Incentive Plan The Amended and Restated 2013 Stock Incentive Plan (the “2013 Plan”) of the Company became effective upon the closing of its Initial Public Offering ("IPO"). The 2013 Plan provides for the grant of options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards to employees, officers, directors, consultants and advisors of the Company. Under the 2013 Plan, the Company may issue up to 38,000,000 shares of the Company’s common stock. At September 30, 2017 , there were 13,547,029 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 September 30, 2017 , there were 9,183,916 shares available for grant under the 2011 Plan. The Company calculated the fair value of the exchanged awards in accordance with the provisions of ASC 718 as of the acquisition date. The Company allocated the fair value of these awards between the pre-acquisition and post-acquisition stock-based compensation expense. The Company determined that the value of the awards under this plan was $22.3 million , of which $5.4 million was attributed to the pre-acquisition period and recognized as part of the purchase consideration for Constant Contact. The balance of $16.9 million has been attributed to the post-acquisition period, and will be recognized in the Company’s consolidated statements of operations and comprehensive loss over the vesting period of the awards. The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) Cost of revenue $ 1,643 $ 1,553 $ 4,116 $ 4,720 Sales and marketing 1,850 2,263 6,249 7,027 Engineering and development 4,164 1,807 6,369 4,707 General and administrative 7,149 13,956 31,484 32,295 Total stock-based compensation expense $ 14,806 $ 19,579 $ 48,218 $ 48,749 2013 Stock Incentive Plan The following table provides a summary of the Company’s stock options as of September 30, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the nine months ended September 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 728,287 $ 7.82 Exercised — $ — Forfeited (534,886 ) $ 12.71 Expired (288,891 ) $ 14.00 Outstanding at September 30, 2017 9,511,941 $ 12.38 7.0 $ 297 Exercisable at September 30, 2017 6,344,460 $ 12.86 6.3 $ 1 Expected to vest after September 30, 2017 (1) 3,167,481 $ 11.42 8.5 $ — Exercisable as of September 30, 2017 and expected to vest (2) 9,511,941 $ 12.38 7.0 $ 297 (1) This represents the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of September 30, 2017 plus the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on September 30, 2017 of $8.20 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. Restricted stock units granted under the 2013 Plan generally vest monthly over a three - or four -year period, unless otherwise determined by the Company’s board of directors. The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the nine months ended September 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Granted 3,827,439 $ 7.92 Vested and unissued (553,774 ) $ 7.93 Canceled (265,070 ) $ 7.85 Non-vested at September 30, 2017 3,108,964 $ 7.94 Restricted stock awards granted under the 2013 Plan generally vest annually over a four -year period, unless otherwise determined by the Company’s board of directors. Performance-based restricted stock awards are earned based on the achievement of performance criteria established by the Company’s compensation committee and board of directors. The following table provides a summary of the Company’s restricted stock award activity for the 2013 Plan during the nine months ended September 30, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (1,969,623 ) $ 10.70 Canceled (200,934 ) $ 11.89 Non-vested at September 30, 2017 5,322,408 $ 14.03 2015 Performance Based Award The performance-based restricted stock award granted to the Company’s former chief executive officer ("CEO") Hari Ravichandran during 2015 provides an opportunity for the participant to earn a fully vested right to up to 3,693,754 shares of the Company’s common stock (the “Award Shares”) over a three -year period beginning July 1, 2015 and ending on June 30, 2018 (the “Performance Period”). Award Shares may be earned based on the Company achieving pre-established, threshold, target and maximum performance metrics. Award Shares may be earned during each calendar quarter during the Performance Period (each, a “Performance Quarter”) if the Company achieves a threshold, target or maximum level of the performance metric for the Performance Quarter. If the performance metric is less than the threshold level for a Performance Quarter, no Award Shares will be earned during the Performance Quarter. Award Shares that were not earned during a Performance Quarter may be earned later during the then current twelve-month period from July 1st to June 30th during the Performance Period (each, a “Performance Year”), at a threshold, target or maximum level of the performance metric for the Performance Year. No Awards Shares were earned for the Performance Quarter ending September 30, 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 that Mr. Ravichandran is employed by the Company on such date. The requirement that he be employed by the Company on June 30, 2018 is waived in the event the executive’s employment is terminated due to death, disability or by the Company without cause, if the executive terminates employment with the Company for good reason, or if the executive is employed by the Company on the date of a change in control (as such terms are defined in the executive’s employment agreement). Upon the occurrence of any of the foregoing events, additional Award Shares may be earned, as provided for in the performance-based restricted stock agreement. This performance-based award is evaluated quarterly to determine the probability of its vesting and determine the amount of stock-based compensation to be recognized. During the three and nine months ended September 30, 2017 , the Company recognized $4.0 million and $9.6 million , respectively, of stock-based compensation expense related to this performance-based award. In April 2017, the Company announced that its board of directors and its CEO adopted a CEO transition plan whereby Mr. Ravichandran would remain as CEO and serve as a board member while the Company conducted a search to identify his successor. The Company's new President and CEO began employment with the Company on August 22, 2017. Mr. Ravichandran is expected to end his employment with the Company during the fourth quarter of 2017. In accordance with the terms of the 2015 Performance Based Award, upon separation of employment, Mr. Ravichandran will receive the Award Shares earned with respect to Performance Quarters completed prior to the separation, plus the greater of (a) the target number of Award Shares eligible to be earned in the Performance Quarter in which the separation occurs and (b) the number of Award Shares that would have been earned in the Performance Quarter in which the separation occurs as if Mr. Ravichandran had remained employed through the end of the Performance Quarter. Based on the expected end date of Mr. Ravichandran's employment, the Company has assumed an attribution period of 2.33 years, and that approximately 1,550,000 shares ultimately will vest under the 2015 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”). Based on the Company's achievement of Constant Contact revenue, adjusted EBITDA and cash flow metrics, these shares vested on March 31, 2017 and each executive earned the maximum number of shares subject to his or her award. The CFO earned 223,214 shares of the Company’s stock, the COO earned 260,416 shares of the Company’s stock, and the CAO earned 148,810 shares of the Company’s stock. These earned shares vested on March 31, 2017. During the three and nine months ended September 30, 2017 , the Company recognized $0.0 million and $1.2 million , respectively, of stock-based compensation expense related to these performance-based awards. New CEO Award On August 11, 2017, the Company and Jeffrey H. Fox entered into an employment agreement (the “Employment Agreement”) appointing Mr. Fox as the Company’s president and chief executive officer effective upon his employment start date (the “Effective Date”) of August 22, 2017. The Employment Agreement provides for Mr. Fox to receive, on the Effective Date, an equity award under the Company’s Amended and Restated 2013 Stock Incentive Plan with a total value of $10,375,000 as of August 11, 2017 (the “Grant Value”), split between an award of 1,032,500 restricted stock units (the “RSU Award”) and an option to purchase 612,419 shares of the Company’s common stock (the “Stock Option Grant”). Two Hundred Eighty-Two Thousand Five Hundred ( 282,500 ) of the restricted stock units subject to the RSU Award vested immediately on the Effective Date, but are subject to a requirement that Mr. Fox hold the shares underlying such restricted stock units until the earlier of the third anniversary of the Effective Date, his death or disability (as defined in the Employment Agreement) or a change in control of the Company (as defined in the Employment Agreement). The Company recorded a charge of $2.2 million for these immediately vested shares during the three and nine months ended September 30, 2017. The remaining 750,000 restricted stock units subject to the RSU Award will vest over a three -year period, with 250,000 of such restricted stock units vesting annually on the anniversary of the Effective Date. The Stock Option Grant will vest over a three -year period, with one-third of the total number of shares subject to the Stock Option Grant vesting on the first anniversary of the Effective Date and the remainder vesting in equal monthly installments thereafter. 2011 Stock Incentive Plan The following table provides a summary of the Company’s stock options as of September 30, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the nine months ended September 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted/ Exchanged 14,724 $ 8.15 Exercised (263,067 ) $ 5.89 Forfeited (502,142 ) $ 10.11 Expired (84,708 ) $ 10.24 Outstanding at September 30, 2017 1,096,637 $ 8.64 4.0 $ 847 Exercisable at September 30, 2017 642,775 $ 8.31 3.2 $ 695 Expected to vest after September 30, 2017 (1) 453,862 $ 9.12 5.1 $ 153 Exercisable as of September 30, 2017 and expected to vest (2) 1,096,637 $ 8.64 4.0 $ 847 (1) This represents the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of September 30, 2017 plus the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on September 30, 2017 of $8.20 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 three - or a four -year period. The following table provides a summary of the Company’s restricted stock unit activity for the 2011 Plan during the nine months ended September 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 1,226,157 $ 7.98 Vested (602,930 ) $ 7.64 Canceled (550,287 ) $ 8.50 Non-vested at September 30, 2017 1,546,595 $ 8.25 As of September 30, 2017 the Company has approximately $17.9 million of unrecognized stock-based compensation expense related to option awards that will be recognized over 2.2 years and approximately $35.6 million of unrecognized stock-based compensation expense related to restricted stock awards to be recognized that will be recognized over 2.2 years for the 2013 Stock Incentive Plan. As of September 30, 2017 the Company has approximately $1.6 million of unrecognized stock-based compensation expense related to option awards that will be recognized over 2.1 years and approximately $10.7 million of unrecognized stock-based compensation expense related to restricted stock awards to be recognized that will be recognized over 2.4 years for the 2011 Stock Incentive Plan.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The following table presents the components of accumulated other comprehensive loss (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2016 $ (2,395 ) $ (1,271 ) $ (3,666 ) Other comprehensive income (loss) 2,984 (309 ) 2,675 Balance at September 30, 2017 $ 589 $ (1,580 ) $ (991 )

Variable Interest Entity

Variable Interest Entity	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	Variable Interest Entity The Company, through a subsidiary formed in China, has entered into various agreements with Shanghai Xiao Lan Network Technology Co., Ltd (“Shanghai Xiao”) and its shareholders that allow the Company to effectively control Shanghai Xiao, making it a variable interest entity (“VIE”). Shanghai Xiao has a technology license that allows it to provide local hosting services to customers located in China. The shareholders of Shanghai Xiao cannot transfer their equity interests without the approval of the Company, and as a result, are considered de facto agents of the Company in accordance with ASC 810-10-25-43. The Company and its de facto agents acting together have the power to direct the activities that most significantly impact the entity’s economic performance and they have the obligation to absorb losses and the right to receive benefits from the entity. In situations where a de facto agency relationship is present, one party is required to be identified as the primary beneficiary. The factors considered include the presence of a principal/agent relationship, the relationship and significance of activities to the reporting entity, the variability associated with the VIE’s anticipated economics and the design of the VIE. The analysis is qualitative in nature and is based on weighting the relative importance on each of the factors in relation to the specifics of the VIE arrangement. Upon the execution of the agreements with Shanghai Xiao and its shareholders, the Company performed an analysis and concluded that the Company is the party that is most closely associated with Shanghai Xiao, as it is the most exposed to the variability of the VIE’s economics and therefore is the primary beneficiary of the VIE. As of September 30, 2017 , the financial position and results of operations of Shanghai Xiao are consolidated within, but are not material to, the Company’s consolidated financial position or results of operations.

Redeemable Non-controlling Inte

Redeemable Non-controlling Interest	9 Months Ended
	Sep. 30, 2017
Noncontrolling Interest [Abstract]
Redeemable Non-controlling Interest	Redeemable Non-controlling Interest In connection with a 2014 equity investment in WZ UK, on January 6, 2016, the Company exercised its option to increase its stake in WZ UK from 49% to 57.5% , thereby acquiring a controlling interest, in exchange for a payment of approximately $2.1 million to the other shareholders of WZ UK. The agreement related to the transaction provides for a put option for the then NCI shareholders to put the remaining equity interest to the Company within pre-specified put periods. As the NCI is subject to a put option that is outside the control of the Company, it was 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 was 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 was expected to be paid upon exercise of the put option was being accreted over the period commencing January 6, 2016 and up to the first put option period, which commenced on the 24 -month anniversary of the acquisition date, August 14, 2016. Adjustments to the carrying amount of the redeemable non-controlling interest were charged to additional paid-in capital. In January 2016, the Company obtained a controlling interest in Resume Labs Limited for $1.5 million and Pseudio Limited for $1.5 million . The agreements related to these transactions provided for put options for the NCI shareholders of each company to put the remaining equity interest to the Company within pre-specified put periods. As the NCI for these entities were subject to put options that were outside the control of the Company, they are deemed redeemable non-controlling interests and were also not recorded in permanent equity, and were presented as part of the mezzanine redeemable non-controlling interest on the consolidated balance sheet. On May 16, 2016, the Company amended the put option with respect to WZ UK to allow it to acquire an additional equity interest in WZ UK earlier than August 2016. Pursuant to this amended option, on the same date the Company acquired an additional 20% stake in WZ UK for $15.4 million , thus increasing its ownership interest from 57.5% to 77.5% . On July 13, 2016, WZ UK completed a restructuring pursuant to which Pseudio Limited and Resume Labs became wholly-owned subsidiaries of WZ UK. As a result of the restructuring, WZ UK became the 100% owner of Pseudio Limited and Resume Labs Limited. Immediately subsequent to the restructuring, the Company acquired additional equity in WZ UK for $18.0 million , bringing the Company’s aggregate stake in WZ UK to 86.4% . The restructuring significantly reduced the amount of the potential redemption amount payable to the minority shareholders of WZ UK, and gave the Company the flexibility to reduce investments in this business. Based on these reduced investments, the estimated value of the non-controlling interest was below the expected redemption amount of $25.0 million , which resulted in $14.2 million of excess accretion that reduced 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 $0.0 million and $7.2 million for the three and nine months ended September 30, 2017 , respectively, which is reflected in net loss attributable to accretion of non-controlling interest in the Company’s consolidated statements of operations and comprehensive loss. Prior to the third quarter of 2016, the Company did not have any accretion amounts in excess of fair value. On July 7, 2017, the Company redeemed the remaining redeemable non-controlling interest for $25.0 million . The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling Interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Payment of redeemable non-controlling interest (25,000 ) Balance as of September 30, 2017 $ — 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	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company files income tax returns in the United States for federal income taxes and in various state jurisdictions. The Company also files in several foreign jurisdictions. In the normal course of business, the Company is subject to examination by tax authorities throughout the world. Since the Company is in a loss carry-forward position, it is generally subject to U.S. federal and state income tax examinations by tax authorities for all years for which a loss carry-forward is utilized. The Company is currently under audit in India for fiscal years ended March 31, 2014, 2015 and 2016 and Israel for the fiscal years ended December 31, 2012, 2013, 2014 and 2015. The statutes of limitations in the Company’s other tax jurisdictions, United Kingdom, Netherlands and Brazil, remain open for various periods between 2012 and the present. However, carryforward attributes from prior years may still be adjusted upon examination by tax authorities if they are used in an open period. The Company does not expect material changes as a result of the India and Israel audits. The Company recognizes, in its consolidated financial statements, the effect of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. During the quarter ended September 30, 2017, management has concluded that the Company’s material tax positions require the recording of an ASC 740-10 reserve, with interest and penalties, for uncertain income tax positions as of September 30, 2017. The Company has unrecognized tax positions at December 31, 2016 and September 30, 2017 of $0.0 million and $1.1 million 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 September 30, 2017 ; • Expiration of various federal, state and foreign tax attributes; • Reversals of existing temporary differences; • Composition and cumulative amounts of existing temporary differences; and • Forecasted profit before tax. Prior to the February 2016 acquisition of Constant Contact, the Company maintained a valuation allowance against certain deferred tax assets. The acquisition of Constant Contacted resulted in a significant increase in deferred tax liabilities, which far exceeded pre-acquisition deferred tax assets. The Company, with the significant deferred tax liabilities resulting from Constant Contact acquisition, scheduled out the reversal of the consolidated U.S. 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 U.S. 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 U.S. deferred tax assets and liabilities generated sufficient income to utilize U.S. 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 U.S. deferred tax assets and liabilities for the period ended September 30, 2017, as the deferred tax liabilities have continued to decrease and the Company generated additional pre-tax losses. As of September 30, 2017, the Company has determined that the reversal of temporary differences will no longer generate sufficient income to utilize certain of its consolidated deferred tax assets in the United States. Accordingly, the Company recorded an increase of $10.4 million to its valuation allowance during the quarter ended September 30, 2017, mostly related to the different book and tax treatment of goodwill. For the three months ended September 30, 2016 and 2017 , the Company recognized a tax benefit of $7.4 million and a tax expense of $3.0 million , respectively, in the consolidated statements of operations and comprehensive loss. The income tax expense for the three months ended September 30, 2017 was primarily attributable to a federal and state deferred tax expense of $1.9 million due primarily to the different book and tax treatment of goodwill, federal and state current income taxes of $0.2 million , a foreign current tax expense of $0.7 million , and a foreign deferred tax expense of $0.2 million . The income tax benefit for the three months ended September 30, 2016 was primarily attributable to a federal and state deferred tax benefit of $9.1 million , a benefit for federal and state current income taxes of $0.1 million , partially offset by a $1.6 million deferred tax expense for the reversal of the valuation allowance, and a foreign current tax expense of $0.3 million . For the nine months ended September 30, 2016 and 2017, the Company recognized tax benefit of $121.2 million and a tax expense of $11.4 million , respectively, in the consolidated statements of operations and comprehensive loss. The income tax expense for the nine months ended September 30, 2017 was primarily attributable to a federal and state deferred tax expense of $7.3 million related to the differences in accounting treatment of goodwill under U.S. GAAP and tax accounting for goodwill, federal and state current income taxes of $2.6 million , a foreign current tax expense of $2.3 million , offset by a foreign deferred tax benefit of $0.8 million . The income tax benefit for the nine months ended September 30, 2016 was primarily attributable to a $72.8 million reversal of the valuation allowance, a federal and state deferred tax benefit of $49.7 million , which includes the identification and recognition of $7.3 million of U.S. federal research and development credits, and a foreign deferred tax benefit of $2.1 million , partially offset by a provision for federal and state current income taxes of $1.4 million and foreign current tax expense of $2.0 million . The provision for income taxes shown on the consolidated statements of operations and comprehensive loss differs from amounts that would result from applying the statutory tax rates to income before taxes primarily because of the application of valuation allowances against U.S. and foreign assets, as well as state income taxes and certain expenses that were non-deductible. As of December 31, 2016 , the Company had NOL carry-forwards available to offset future U.S. federal taxable income of approximately $142.7 million and future state taxable income of approximately $125.6 million . These NOL carry-forwards expire on various dates through 2036 . As of December 31, 2016, the Company had NOL carry-forwards in foreign jurisdictions available to offset future foreign taxable income by approximately $96.8 million . The Company has loss carry-forwards that begin to expire in 2021 in India totaling $2.5 million and in China totaling $0.3 million . The Company has loss carry-forwards that begin to expire in 2020 in the Netherlands totaling $10.7 million . The Company also has loss carry-forwards in the United Kingdom, Israel and Singapore of $81.1 million , $1.9 million , and $0.3 million , respectively, which have an indefinite carry-forward period. In addition, the Company has $3.4 million of U.S. federal capital loss carry-forwards and $1.4 million in state capital loss carry-forwards, generally expiring through 2021. As of December 31, 2016, the Company had U.S. tax credit carryforwards available to offset future U.S. federal and state taxes of approximately $20.3 million and $12.2 million , respectively. These credit carryforwards expire on various dates through 2036. Utilization of the NOL carry-forwards may be subject to an annual limitation due to the ownership percentage change limitations under Section 382 of the Internal Revenue Code (“Section 382 limitation”). Ownership changes can limit the amount of net operating loss and other tax attributes that a company can use each year to offset future taxable income and taxes payable. In connection with a change in control in 2011 the Company was subject to Section 382 limitations of $77.1 million against the balance of NOL carry-forwards generated prior to the change in control in 2011. Through December 31, 2014 , the Company accumulated the unused amount of Section 382 limitations in excess of the amount of NOL carry-forwards that were originally subject to limitation. Therefore, these unused NOL carry-forwards are available for future use to offset taxable income. The Company has completed an analysis of changes in its ownership from 2011, through its IPO, to December 31, 2014 . The Company concluded that there was not a Section 382 ownership change during this period and therefore any NOLs generated through December 31, 2014 , are not subject to any new Section 382 limitations on NOL carry-forwards. On November 20, 2014, the Company completed a follow-on offering of 13,000,000 shares of common stock. The underwriters also exercised their overallotment option to purchase an additional 1,950,000 shares of common stock from the selling stockholders. The Company performed an analysis of the impact of this offering and determined that no Section 382 change in ownership had occurred. On March 11, 2015, the Company completed a follow-on offering of its common stock, in which selling stockholders sold 12,000,000 shares of common stock at a public offering price of $19.00 per share. The underwriter also exercised its overallotment option to purchase an additional 1,800,000 shares of common stock from the selling stockholders. The Company completed an analysis of its ownership changes in the first half of 2016, which resulted in no ownership-change for tax purposes within the meaning of the Internal Revenue Code Section 382(g).

Severance and Other Exit Costs

Severance and Other Exit Costs	9 Months Ended
	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Severance and Other Exit Costs	Severance and Other Exit Costs The Company continues to evaluate its data center, sales and marketing, support and engineering operations and the general and administrative function in an effort to optimize its cost structure. As a result, the Company may incur charges for employee severance, exiting facilities and restructuring data center commitments and other related costs. 2017 Restructuring Plan In January 2017, the Company announced plans to close certain offices as part of a plan to consolidate certain web presence customer support operations, resulting in severance costs (the “2017 Restructuring Plan”). These severance charges were associated with the elimination of approximately 660 positions, primarily in customer support. Additionally, the Company implemented additional restructuring plans to create operational efficiencies and synergies related to the Constant Contact acquisition, which resulted in additional severance charges for the elimination of approximately 50 positions. In connection with these plans, the Company incurred severance costs of $3.9 million and $12.8 million , and paid $3.0 million and $6.8 million , during the three and nine months ended September 30, 2017 , respectively. The Company had a remaining accrued severance liability of $6.0 million as of September 30, 2017 . In connection with the 2017 Restructuring Plan, the Company closed offices in Orem, Utah and relocated certain employees to our Tempe, Arizona office. During the three and nine months ended September 30, 2017 , the Company incurred facility charges of $0.3 million and $0.9 million , respectively. The Company made payments of $0.3 million and $0.3 million during the three and nine months ended September 30, 2017 , and had a remaining accrued facility liability of $0.6 million as of September 30, 2017 . The Company expects to incur severance charges related to the 2017 Restructuring Plan through December 31, 2017, and expects to complete severance payments related to this plan 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 the elimination of approximately 265 positions across the business. The Company did not incur additional severance costs during the three and nine months ended September 30, 2017 . The Company paid $0.2 million and $1.6 million of severance costs during the three and nine months ended September 30, 2017 , respectively. There is no severance accrual remaining as of September 30, 2017 . The 2016 Restructuring Plan included the closure of offices in San Francisco, California, Delray Beach, Florida, New York, New York, Miami, Florida, the United Kingdom and Brazil, and the relocation of certain employees to our Austin, Texas office. The Company also closed a portion of the Constant Contact offices in Waltham, Massachusetts. During the three and nine months ended September 30, 2017 , the Company recorded an adjustment to the Waltham facilities charge for future lease payments of $0.3 million and $0.8 million , respectively, due to a change in estimated sublease income. The Company paid $1.3 million and $3.7 million of facility costs related to the 2016 Restructuring Plan during the three and nine months ended September 30, 2017 , respectively, and had a remaining accrued facility liability of $5.8 million as of September 30, 2017 . The Company incurred all employee-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016, and expects severance payments related to the 2016 Restructuring Plan to be completed during the year ended December 31, 2017. Other than the adjustment mentioned above, the Company completed facility-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016, and expects to complete facility exit cost payments related to this plan during the year ended December 31, 2022. Activity of Combined Restructuring Plans The following table provides a summary of the aggregate activity for the nine months ended September 30, 2017 related to the Company’s combined restructuring plans' severance accrual: Employee Severance (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 633 $ 926 $ 1,559 Severance charges 8,804 4,083 12,887 Cash paid (4,530 ) (3,899 ) (8,429 ) Balance at September 30, 2017 $ 4,907 $ 1,110 $ 6,017 The following table provides a summary of the aggregate activity for the nine months ended September 30, 2017 related to the Company’s combined restructuring plans' facilities exit accrual: Facilities (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 273 $ 8,747 $ 9,020 Facility adjustments 915 783 1,698 Sublease income received 532 — 532 Cash paid (973 ) (3,719 ) (4,692 ) Balance at September 30, 2017 $ 747 $ 5,811 $ 6,558 The following table presents restructuring charges recorded in the consolidated statements of operations and comprehensive loss for the periods presented: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2016 2017 2016 2017 (in thousands) Cost of revenue $ 3,127 $ 449 $ 8,729 $ 3,892 Sales and marketing 1,189 1,011 6,357 3,260 Engineering and development 1,014 271 4,256 1,349 General and administrative 1,047 2,758 4,300 6,083 Total restructuring charges $ 6,377 $ 4,489 $ 23,642 $ 14,584

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies From time to time, the Company is involved in legal proceedings or subject to claims arising in the ordinary course of its business. The Company is not presently involved in any such legal proceeding or subject to any such claim that, in the opinion of its management would have a material adverse effect on its business, operating results or financial condition. However, the results of such legal proceedings or claims cannot be predicted with certainty, and regardless of the outcome, can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. Neither the ultimate outcome of the matters listed below nor an estimate of any probable losses or any reasonably possible losses (other than the SEC investigations reserve discussed below) can be assessed at this time. The Company received a subpoena dated December 10, 2015 from the Boston Regional Office of the SEC, requiring the production of certain documents, including, among other things, documents related to its financial reporting, including operating and non-GAAP metrics, refund, sales and marketing practices and transactions with related parties. The Company is fully cooperating with the SEC’s investigation. The Company is also in discussions with the Boston Regional Office regarding a potential resolution of its investigation, and has reserved $8.0 million in connection with a potential resolution of both this investigation and the Constant Contact investigation discussed below. The Company can make no assurances as to whether the investigation will be resolved by agreement and/or the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on the Company’s business, financial condition, results of operations and cash flows. On May 4, 2015, Christopher Machado, a purported holder of the Company’s common stock, filed a civil action in the United States District Court for the District of Massachusetts against the Company and its former chief executive officer and former chief financial officer, captioned Machado v. Endurance International Group Holdings, Inc., et al., Civil Action No. 1:15-cv-11775-GAO. The plaintiff filed an amended complaint on December 8, 2015, and a second amended complaint on March 18, 2016. The Company moved to dismiss the second amended complaint, but before the court ruled on the Company's motion, with the Company's assent, the plaintiff filed a third amended complaint on June 30, 2017. In the third amended complaint, plaintiffs Christopher Machado and Michael Rubin allege claims for violations of Section 10(b) and 20(a) of the Exchange Act, and Sections 11, 12(a)(2), and 15 of the Securities Act, on behalf of a purported class of purchasers of the Company’s securities between October 25, 2013 and December 16, 2015, including persons or entities who purchased or acquired the Company's shares pursuant or traceable to the registration statement and prospectus issued in connection with the Company's October 25, 2013 initial public offering. The plaintiffs challenge as false or misleading certain of the Company’s disclosures about the total number of subscribers, average revenue per subscriber, the number of customers paying over $500 per year for the Company’s products and services, and the average number of products sold per subscriber. The plaintiffs seek, on behalf of themselves and the purported class, compensatory damages, rescissory damages as to class members who purchased shares pursuant to the offering and the plaintiffs' costs and expenses of litigation. The Company moved to dismiss the third amended complaint on August 29, 2017. The plaintiffs' memorandum in opposition to the Company's motion to dismiss was filed on October 30, 2017 and the Company's reply memorandum is due on December 14, 2017. The Company and the individual defendants intend to deny any liability or wrongdoing and to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of the proceeding. Constant Contact On February 9, 2016, the Company acquired all of the outstanding shares of common stock of Constant Contact. On December 10, 2015, Constant Contact received a subpoena from the Boston Regional Office of the SEC, requiring the production of documents pertaining to Constant Contact’s sales, marketing, and customer retention practices, as well as periodic public disclosure of financial and operating metrics. The Company is fully cooperating with the SEC’s investigation. As discussed above, the Company is in discussions with the Boston Regional Office regarding a potential resolution of its investigation, and has reserved $8.0 million during the three and nine months ended September 30, 2017 in connection with a potential resolution of both this investigation and the Endurance investigation discussed above. The Company can make no assurances as to whether the investigation will be resolved by agreement and/or the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on the Company’s business, financial condition, results of operations and cash flows. On August 7, 2015, a purported class action lawsuit, William McGee v. Constant Contact, Inc., et al, was filed in the United States District Court for the District of Massachusetts against Constant Contact and two of its former officers. An amended complaint, which named an additional former officer as a defendant, was filed December 19, 2016. The lawsuit asserts claims under Sections 10(b) and 20(a) of the Exchange Act, and is premised on allegedly false and/or misleading statements, and non-disclosure of material facts, regarding Constant Contact’s business, operations, prospects and performance during the proposed class period of October 23, 2014 to July 23, 2015. This litigation remains in its early stages. The Company and the individual defendants intend to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of this proceeding. In August 2012, RPost Holdings, Inc., RPost Communications Limited and RMail Limited, or collectively, RPost, filed a complaint in the United States District Court for the Eastern District of Texas that named Constant Contact as a defendant in a lawsuit. The complaint alleged that certain elements of Constant Contact’s email marketing technology infringe five patents held by RPost. RPost seeks an award for damages in an unspecified amount and injunctive relief. In February 2013, RPost amended its complaint to name five of Constant Contact’s marketing partners as defendants. Under Constant Contact’s contractual agreements with these marketing partners, it is obligated to indemnify them for claims related to patent infringement. Constant Contact filed a motion to sever and stay the claims against its partners and multiple motions to dismiss the claims against it. In January 2014, the case was stayed pending the resolution of certain state court and bankruptcy actions involving RPost, to which Constant Contact is not a party. The case continues to be stayed pending the state court and bankruptcy actions. Meanwhile, RPost asserted the same patents asserted against Constant Contact in litigation against Go Daddy. In June 2016, Go Daddy succeeded in invalidating all of those RPost patents. On July 7, 2016, RPost appealed the District Court order to the United States Court of Appeal for the Federal Circuit. On November 14, 2016, Endurance filed an amicus brief in the Federal Circuit in support of GoDaddy’s position. The case was argued on May 3, 2017, and the Federal Circuit issued an order without opinion affirming the district court’s decision that the RPost patents are invalid. On June 5, 2017, RPost filed a Combined Petition for Panel Rehearing and Rehearing En Banc. On July 6, 2017, the Federal Circuit invited GoDaddy to respond to RPost’s Petition, and on August 8, 2017, the Federal Circuit denied RPost's peition for panel rehearing and rehearing en banc. RPost has until November 9, 2017 to file a write of certiorari with the Supreme Court. If RPost does not file a writ of certiorari or the Supreme Court does not take this case, all claims asserted by RPost against Constant Contact in December 2012 will remain invalid except for one claim from one patent. Constant Contact has notified RPost that it believes the remaining claim is invalid in light of the other litigation that RPost lost. RPost has refused to dismiss its case against Constant Contact until it has exhausted all of its appeals. 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”), which named 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 alleged breach of fiduciary duty by the former directors, and aiding and abetting the alleged breach by Morgan Stanley. The Constant Contact defendants filed a motion to dismiss the Amended Complaint on December 15, 2016 and an opening brief in support of the motion to dismiss on March 17, 2017. Plaintiff Myers filed an opposition brief to the motion to dismiss on May 17, 2017, and the Constant Contact defendants’ reply brief was filed on June 19, 2017. Oral argument took place on October 16, 2017 and the court gave the plaintiff 30 days to consider whether to withdraw the case or move forward and receive a decision on the motion to dismiss. On November 2, 2017, the court entered a Stipulation and Order dismissing the case.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has various agreements in place with related parties. Below are details of material related party transactions that occurred during the nine months ended September 30, 2016 and 2017 . Tregaron: The Company has contracts with Tregaron India Holdings, LLC and its affiliates, including Diya Systems (Mangalore) Private Limited, Glowtouch Technologies Pvt. Ltd. and Touchweb Designs, LLC (collectively, “Tregaron”), for outsourced services, including email- and chat-based customer and technical support, network monitoring, engineering and development support and web design and web building services, and an office space lease. These entities are owned directly or indirectly by family members of the Company’s former chief executive officer, who is also a holder of more than 5.0% of the Company's capital stock. The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by Tregaron and its affiliates under these agreements: As of December 31, 2016 , approximately $1.3 million was included in accounts payable and accrued expense relating to services provided by Tregaron. As of September 30, 2017 , approximately $1.5 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Cost of revenue $ 3,000 $ 3,100 $ 9,400 $ 9,100 Sales and marketing 150 500 350 1,000 Engineering and development 300 200 900 850 General and administrative 100 50 200 150 Total related party transaction expense, net $ 3,550 $ 3,850 $ 10,850 $ 11,100 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 a director of the Company and by the Company’s former chief executive officer, who is a holder of more than 5.0% of the Company's capital stock. During the quarter ended March 31, 2017, the Company’s principal agreement with this entity was amended to permit the Company to purchase a specific IBS website performance product at no charge, and in exchange, to increase the revenue share to IBS on certain website performance products. The Company records revenue on the sale of IBS products on a net basis, since the Company views IBS as the primary obligor to deliver these services. As a result, the revenue share paid by the Company to IBS is recorded as contra-revenue. Further, IBS pays the Company a fee on sales made by IBS directly to customers of the Company. The Company records these fees as revenue. The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Revenue $ (900 ) $ (1,050 ) $ (2,200 ) $ (2,150 ) Revenue (contra) 1,800 1,850 5,900 4,050 Total related party transaction impact to revenue $ 900 $ 800 $ 3,700 $ 1,900 Cost of revenue 150 150 500 350 Total related party transaction expense, net $ 1,050 $ 950 $ 4,200 $ 2,250 As of December 31, 2016 and September 30, 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 September 30, 2017 , approximately $1.1 million and $1.2 million , respectively was included in accounts payable and accrued expense relating to the Company’s agreements with IBS. As of December 31, 2016 and September 30, 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"). Goldman is a significant shareholder of the Company. Refer to Note 5 : Fair Value Measurements , for further details. Goldman Sachs Lending Partners LLC, a subsidiary of Goldman, was one of the joint bookrunners and joint lead arrangers for the 2017 Refinancing. In that capacity, Goldman Sachs Lending Partners LLC received an arrangement fee of $0.5 million , and was reimbursed for an immaterial amount of expenses.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker. The Company's chief executive officer is the Company's chief operating decision maker. On February 9, 2016, the Company acquired Constant Contact and evaluated the criteria in ASC 280-10-50-11 contemporaneously with this acquisition. Based on the Company's original evaluation, the Company believed that it met the qualitative aggregation criteria in ASC 280-10-50-11, and that the economic characteristics of the Constant Contact and legacy businesses were similar. In particular, at the time of this evaluation, the Company expected that the gross margin of Constant Contact and its legacy business would be similar. However, beginning with the second quarter of 2016, the Company recognized that the legacy business did not meet expectations and as such resulted in lower legacy gross margin than originally anticipated. This was expected to reverse in the near term, however, it continued into the third and fourth quarter of 2016. As such, during the Company's annual assessment of segments, and due to the resulting 2016 legacy performance, the Company determined it had two reportable segments: • Email marketing, which includes the products and services acquired as part of the Constant Contact acquisition in February 2016. The services included in this segment are primarily email marketing, and to a lesser extent, event marketing, survey tools and the Single Platform digital storefront product. • Web presence, which consists of all of the Company's web hosting and related services such as domain names, website security, website design tools and services, ecommerce services and other services and tools to expand the online presence of a small business. The Company measures profitability of these segments based on revenue, gross profit, and adjusted EBITDA. The accounting policies of each segment are the same as those described in the summary of significant accounting policies; please refer to Note 2 : Summary of Significant Accounting Policies , for further details. The following tables contain financial information for each reportable segment for the three months and nine months ended September 30, 2016 and 2017 : Three Months Ended Three Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 195,275 $ 95,918 $ 291,193 $ 193,696 $ 101,526 $ 295,222 Gross profit $ 89,059 $ 52,707 $ 141,766 $ 71,071 $ 65,286 $ 136,357 Net loss $ (19,886 ) $ (9,912 ) $ (29,798 ) $ (42,466 ) $ 2,202 $ (40,264 ) Interest expense, net (1) 18,244 22,802 41,046 15,131 20,514 35,645 Income tax (benefit) expense (1,435 ) (5,952 ) (7,387 ) 1,659 1,323 2,982 Depreciation 9,173 7,837 17,010 10,338 3,233 13,571 Amortization of other intangible assets 19,729 18,253 37,982 16,577 18,770 35,347 Stock-based compensation 12,703 2,103 14,806 17,912 1,668 19,580 Restructuring expenses 541 5,836 6,377 3,806 682 4,488 Transaction expenses and charges 159 — 159 — — — SEC investigations reserve — — — 5,249 2,751 8,000 Loss (gain) of unconsolidated entities (2) 5,018 — 5,018 (33 ) — (33 ) Impairment of other long-lived assets (3) — — — 14,448 — 14,448 Adjusted EBITDA $ 44,246 $ 40,967 $ 85,213 $ 42,621 $ 51,143 $ 93,764 Nine Months Ended Nine Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 589,364 $ 229,655 $ 819,019 $ 584,217 $ 298,400 $ 882,617 Gross profit $ 265,610 $ 114,429 $ 380,039 $ 240,239 $ 188,181 $ 428,420 Net income (loss) $ 2,787 $ (51,934 ) $ (49,147 ) $ (99,232 ) $ (8,025 ) $ (107,257 ) Interest expense, net (1) 53,337 58,798 112,135 52,304 68,212 120,516 Income tax (benefit) expense (90,033 ) (31,187 ) (121,220 ) 16,203 (4,819 ) 11,384 Depreciation 27,248 19,694 46,942 30,101 10,632 40,733 Amortization of other intangible assets 59,252 46,427 105,679 48,857 55,697 104,554 Stock-based compensation 37,778 10,440 48,218 43,357 5,392 48,749 Restructuring expenses 1,501 22,141 23,642 9,842 4,742 14,584 Transaction expenses and charges 31,273 984 32,257 — 773 773 SEC investigations reserve — — — 5,249 2,751 8,000 (Gain) loss of unconsolidated entities (2) (5,368 ) — (5,368 ) (72 ) — (72 ) Impairment of other long-lived assets (3) 8,285 — 8,285 14,448 — 14,448 Adjusted EBITDA $ 126,060 $ 75,363 $ 201,423 $ 121,057 $ 135,355 $ 256,412 As of December 31, 2016 As of September 30, 2017 Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $1,507,977 $1,248,297 $2,756,274 $1,422,268 $1,228,831 $2,651,099 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. For the nine months ended September 30, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (2) The loss (gain) of unconsolidated entities is reported on a net basis for the three and nine months ended September 30, 2016. The three months ended September 30, 2016 includes a loss of $4.8 million on our investment in AppMachine. This loss was generated on July 27, 2016, when we increased our ownership stake in AppMachine from 40.0% to 100.0% , which required a revaluation of our existing investment to its implied fair value. The three months ended September 30, 2016 also includes a net loss of $0.2 million from our proportionate share of net loses from unconsolidated entities. The nine months ended September 30, 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 49.0% 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 $1.2 million . (3) The impairment of other long-lived assets for the three and nine months ended September 30, 2016 includes $6.3 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the three and nine months ended September 30, 3017 includes $13.8 million related to certain domain name intangible assets, and $0.6 million to write off a debt investment in a privately held entity.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company evaluated all subsequent events occurring through November 3, 2017, to determine if any such events should be reflected in these financial statements. There were no material recognized subsequent events recorded in the September 30, 2017 financial statements.

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Guarantor Financial Information	Supplemental Guarantor Financial Information In February 2016, EIG Investors Corp., a wholly-owned subsidiary of the Company (the “Issuer”), issued $350.0 million aggregate principal amount of its 10.875% Senior Notes due 2024 (the “Original Notes”) (refer to Note 9 : Notes Payable in the consolidated financial statements), which it exchanged for new 10.875% Senior Notes due 2024 (the “Exchange Notes” and together with the Original Notes, collectively, the “Notes”) pursuant to a registration statement on Form S-4. The registered exchange offer for the Notes was completed on January 30, 2017. The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by the Company, and the following wholly-owned subsidiaries: The Endurance International Group, Inc., Bluehost Inc., FastDomain Inc., Domain Name Holding Company, Inc., Endurance International Group – West, Inc., HostGator.com LLC, A Small Orange, LLC, Constant Contact, Inc., and SinglePlatform, LLC, (collectively, the “Subsidiary Guarantors”), subject to certain customary guarantor release conditions. The Company’s other domestic subsidiaries and its foreign subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) have not guaranteed the Notes. The Company sold two immaterial guarantors, CardStar, Inc. and CardStar Publishing, LLC (collectively, "CardStar"), during the quarter ended December 31, 2016. CardStar was released and discharged from the guarantee as a result of the sale and no longer guarantees the debt of the Company as of December 1, 2016. Proceeds from the sale of CardStar were approximately $0.1 million . The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and September 30, 2017, supplemental condensed consolidating results of operations for the three months and nine ended September 30, 2016 and 2017, and cash flow information for the nine months ended September 30, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 $ — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 461 $ 1 $ 54,881 $ 15,178 $ — $ 70,521 Restricted cash — — 2,472 175 — 2,647 Accounts receivable — — 10,817 3,167 — 13,984 Prepaid domain name registry fees — — 29,367 26,390 (15 ) 55,742 Prepaid expenses & other current assets 32 28 18,040 11,070 — 29,170 Total current assets 493 29 115,577 55,980 (15 ) 172,064 Intercompany receivables, net 32,723 680,824 (566,701 ) (146,846 ) — — Property and equipment, net — — 73,717 14,840 — 88,557 Goodwill — — 1,685,981 176,508 — 1,862,489 Other intangible assets, net — — 483,397 12,261 378 496,036 Investment in subsidiaries 28,476 1,311,664 43,652 — (1,383,792 ) — Other assets — 3,831 21,684 6,438 — 31,953 Total assets $ 61,692 $ 1,996,348 $ 1,857,307 $ 119,181 $ (1,383,429 ) $ 2,651,099 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 11,577 $ 1,820 $ — $ 13,397 Accrued expenses and other current liabilities — 14,596 68,949 10,179 — 93,724 Deferred revenue — — 315,534 53,104 (25 ) 368,613 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 3,166 — — 3,166 Deferred consideration, short-term — — 4,294 25 — 4,319 Total current liabilities — 48,541 403,520 65,128 (25 ) 517,164 Deferred revenue, long-term — — 81,155 9,749 — 90,904 Notes payable — 1,920,258 — — — 1,920,258 Capital lease obligations — — 1,485 — — 1,485 Deferred consideration — — 3,493 — — 3,493 Other long-term liabilities — (927 ) 56,367 652 — 56,092 Total liabilities — 1,967,872 546,020 75,529 (25 ) 2,589,396 Equity 61,692 28,476 1,311,287 43,652 (1,383,404 ) 61,703 Total liabilities and equity $ 61,692 $ 1,996,348 $ 1,857,307 $ 119,181 $ (1,383,429 ) $ 2,651,099 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 258,366 $ 34,213 $ (1,386 ) $ 291,193 Cost of revenue — — 127,750 23,191 (1,514 ) 149,427 Gross profit — — 130,616 11,022 128 141,766 Operating expense: Sales and marketing — — 62,737 12,614 (10 ) 75,341 Engineering and development — — 21,802 2,186 — 23,988 General and administrative — 67 29,640 3,692 — 33,399 Transaction costs — — 159 — — 159 Total operating expense — 67 114,338 18,492 (10 ) 132,887 (Loss) income from operations — (67 ) 16,278 (7,470 ) 138 8,879 Interest expense and other income, net — 40,206 5,738 (53 ) — 45,891 (Loss) income before income taxes and equity earnings of unconsolidated entities — (40,273 ) 10,540 (7,417 ) 138 (37,012 ) Income tax (benefit) expense — (13,971 ) 6,401 183 — (7,387 ) (Loss) income before equity earnings of unconsolidated entities — (26,302 ) 4,139 (7,600 ) 138 (29,625 ) Equity loss (income) of unconsolidated entities, net of tax 31,875 5,573 7,772 110 (45,157 ) 173 Net (loss) income $ (31,875 ) $ (31,875 ) $ (3,633 ) $ (7,710 ) $ 45,295 $ (29,798 ) Net loss attributable to non-controlling interest — — 1,939 — — 1,939 Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (31,875 ) $ (31,875 ) $ (5,572 ) $ (7,710 ) $ 45,295 $ (31,737 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 112 — 112 Unrealized gain on cash flow hedge, net of taxes — 72 — — — 72 Total comprehensive (loss) income $ (31,875 ) $ (31,803 ) $ (5,572 ) $ (7,598 ) $ 45,295 $ (31,553 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Nine months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 720,149 $ 101,913 $ (3,043 ) $ 819,019 Cost of revenue — — 374,010 68,548 (3,578 ) 438,980 Gross profit — — 346,139 33,365 535 380,039 Operating expense: Sales and marketing — — 179,714 55,256 (26 ) 234,944 Engineering and development — — 55,583 12,347 — 67,930 General and administrative — 187 97,694 10,627 — 108,508 Transaction costs — — 32,257 — — 32,257 Total operating expense — 187 365,248 78,230 (26 ) 443,639 (Loss) income from operations — (187 ) (19,109 ) (44,865 ) 561 (63,600 ) Interest expense and other income, net — 109,547 (3,839 ) (138 ) — 105,570 (Loss) income before income taxes and equity earnings of unconsolidated entities — (109,734 ) (15,270 ) (44,727 ) 561 (169,170 ) Income tax (benefit) expense — (40,840 ) (80,037 ) (343 ) — (121,220 ) (Loss) income before equity earnings of unconsolidated entities — (68,894 ) 64,767 (44,384 ) 561 (47,950 ) Equity loss (income) of unconsolidated entities, net of tax 38,528 (30,366 ) 45,581 202 (52,748 ) 1,197 Net (loss) income $ (38,528 ) $ (38,528 ) $ 19,186 $ (44,586 ) $ 53,309 $ (49,147 ) Net loss attributable to non-controlling interest — — (11,181 ) — — (11,181 ) Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (38,528 ) $ (38,528 ) $ 30,367 $ (44,586 ) $ 53,309 $ (37,966 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 994 — 994 Unrealized loss on cash flow hedge, net of taxes — (1,866 ) — — — (1,866 ) Total comprehensive (loss) income $ (38,528 ) $ (40,394 ) $ 30,367 $ (43,592 ) $ 53,309 $ (38,838 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 266,985 $ 30,019 $ (1,782 ) $ 295,222 Cost of revenue — — 139,044 21,155 (1,334 ) 158,865 Gross profit — — 127,941 8,864 (448 ) 136,357 Operating expense: Sales and marketing — — 61,376 4,900 — 66,276 Engineering and development — — 17,412 2,470 — 19,882 General and administrative — 56 50,353 1,465 (605 ) 51,269 Transaction costs — — — — — — Total operating expense — 56 129,141 8,835 (605 ) 137,427 (Loss) income from operations — (56 ) (1,200 ) 29 157 (1,070 ) Interest expense and other income, net — 35,661 756 (172 ) — 36,245 (Loss) income before income taxes and equity earnings of unconsolidated entities — (35,717 ) (1,956 ) 201 157 (37,315 ) Income tax (benefit) expense — (13,201 ) 15,494 689 — 2,982 (Loss) income before equity earnings of unconsolidated entities — (22,516 ) (17,450 ) (488 ) 157 (40,297 ) Equity loss (income) of unconsolidated entities, net of tax 40,422 17,906 456 — (58,817 ) (33 ) Net (loss) income $ (40,422 ) $ (40,422 ) $ (17,906 ) $ (488 ) $ 58,974 $ (40,264 ) Net loss attributable to non-controlling interest — — — — — — Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (40,422 ) $ (40,422 ) $ (17,906 ) $ (488 ) $ 58,974 $ (40,264 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,070 — 1,070 Unrealized gain on cash flow hedge, net of taxes — 83 — — — 83 Total comprehensive (loss) income $ (40,422 ) $ (40,339 ) $ (17,906 ) $ 582 $ 58,974 $ (39,111 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Nine months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 788,806 $ 98,321 $ (4,510 ) $ 882,617 Cost of revenue — — 392,447 65,392 (3,642 ) 454,197 Gross profit — — 396,359 32,929 (868 ) 428,420 Operating expense: Sales and marketing — — 195,392 15,765 (3 ) 211,154 Engineering and development — — 51,053 9,340 — 60,393 General and administrative — 166 123,736 7,632 (605 ) 130,929 Transaction costs — — 773 — — 773 Total operating expense — 166 370,954 32,737 (608 ) 403,249 (Loss) income from operations — (166 ) 25,405 192 (260 ) 25,171 Interest expense and other income, net — 120,313 1,150 (347 ) — 121,116 (Loss) income before income taxes and equity earnings of unconsolidated entities — (120,479 ) 24,255 539 (260 ) (95,945 ) Income tax (benefit) expense — (44,512 ) 54,744 1,152 — 11,384 Loss before equity earnings of unconsolidated entities — (75,967 ) (30,489 ) (613 ) (260 ) (107,329 ) Equity loss (income) of unconsolidated entities, net of tax 106,999 31,033 543 — (138,647 ) (72 ) Net (loss) income $ (106,999 ) $ (107,000 ) $ (31,032 ) $ (613 ) $ 138,387 $ (107,257 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (106,999 ) $ (107,000 ) $ (38,556 ) $ (613 ) $ 138,387 $ (114,781 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 2,984 — 2,984 Unrealized loss on cash flow hedge, net of taxes — (309 ) — — — (309 ) Total comprehensive (loss) income $ (106,999 ) $ (107,309 ) $ (38,556 ) $ 2,371 $ 138,387 $ (112,106 ) Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash (used in) provided by operating activities $ — $ (54,904 ) $ 187,068 $ (30,360 ) $ — $ 101,804 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (889,634 ) — — (889,634 ) Purchases of property and equipment — — (25,362 ) (3,955 ) — (29,317 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 240 2 — 242 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (10 ) (17 ) — (27 ) Net withdrawals of principal balances in restricted cash accounts — — (347 ) (391 ) — (738 ) Net cash used in investing activities — — (920,713 ) (4,361 ) — (925,074 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,105,678 — — — 1,105,678 Repayment of notes payable and revolver — (125,775 ) — — — (125,775 ) Payment of financing costs — (52,561 ) — — — (52,561 ) Payment of deferred consideration — — (42,411 ) (669 ) — (43,080 ) Payment of redeemable non-controlling interest liability — — (33,425 ) — — (33,425 ) Principal payments on capital lease obligations — — (4,372 ) — — (4,372 ) Proceeds from exercise of stock options 2,304 — — — — 2,304 Capital investments from minority partner — — — 2,776 — 2,776 Intercompany loans and investments (2,313 ) (872,490 ) 840,305 34,498 — — Net cash (used in) provided by financing activities (9 ) 54,852 760,097 36,605 — 851,545 Net effect of exchange rate on cash and cash equivalents — — — 1,843 — 1,843 Net (decrease) increase in cash and cash equivalents (9 ) (52 ) 26,452 3,727 — 30,118 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 3 $ 15 $ 47,738 $ 15,392 $ — $ 63,148 Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash (used in) provided by operating activities $ (32 ) $ (72,687 ) $ 204,768 $ (3,183 ) $ — $ 128,866 Cash flows from investing activities: Purchases of property and equipment — — (28,140 ) (3,955 ) — (32,095 ) Proceeds from sale of property and equipment — — 292 — — 292 Purchases of intangible assets — — (1,932 ) (34 ) — (1,966 ) Net deposits of principal balances in restricted cash accounts — — 148 507 — 655 Net cash used in investing activities — — (29,632 ) (3,482 ) — (33,114 ) Cash flows from financing activities: — Proceeds from issuance of term loan and notes, net of original issue discounts — 1,693,007 — — — 1,693,007 Repayment of term loans — (1,733,147 ) — — — (1,733,147 ) Payment of financing costs — (6,304 ) — — — (6,304 ) Payment of deferred consideration — — (4,550 ) (858 ) — (5,408 ) Payment of redeemable non-controlling interest liability — — (25,000 ) — — (25,000 ) Principal payments on capital lease obligations — — (5,679 ) — — (5,679 ) Proceeds from exercise of stock options 1,548 — — — — 1,548 Intercompany loans and investments (1,058 ) 119,128 (124,060 ) 5,990 — — Net cash provided by (used in) financing activities 490 72,684 (159,289 ) 5,132 — (80,983 ) Net effect of exchange rate on cash and cash equivalents — — — 2,156 — 2,156 Net increase (decrease) in cash and cash equivalents 458 (3 ) 15,847 623 — 16,925 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 461 $ 1 $ 54,881 $ 15,178 $ — $ 70,521

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Basis of Preparation	Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions were eliminated on consolidation.
Segment Information	Segment Information The Company has reviewed the criteria of the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 280-10, Segment Reporting , and determined that the Company is comprised of two segments for reporting purposes: web presence and email marketing. The web presence segment consists predominantly of the Company's web hosting brands and related products such as domain names, website security tools, website design tools and services, ecommerce tools and other services designed to grow the online presence of a small business. The email marketing segment consists of Constant Contact email marketing tools and the SinglePlatform digital storefront product, both of which the Company acquired in the February 2016 acquisition of Constant Contact, Inc. ("Constant Contact"). The Company has experienced a number of changes in its management structure during 2017, including a change in its chief executive officer. The Company considers the chief executive officer to be the Chief Operating Decision Maker, or CODM, for purposes of assessing reportable segments and reporting units. The new CODM is undertaking an assessment of the management and financial reporting structure of the Company and expects to make changes to that structure during the fourth quarter of 2017. These changes may impact the number and makeup of the Company's segments for reporting purposes.
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 September 30, 2017 , and the related consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2016 and 2017 , cash flows for the nine months ended September 30, 2016 and 2017 , and the notes to consolidated financial statements are unaudited. These unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements. The unaudited consolidated financial statements include, in the opinion of management, all adjustments, consisting only of normal recurring adjustments that are necessary for a fair presentation of the Company’s financial position at September 30, 2017 , results of operations for the three and nine months ended September 30, 2016 and 2017 and cash flows for the nine months ended September 30, 2016 and 2017 . The consolidated results in the consolidated statements of operations and comprehensive loss are not necessarily indicative of the results of operations to be expected for the full fiscal year ending December 31, 2017 .
Accounts Receivable	Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable.
Prepaid Domain Name Registry Fees	Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging, or ASC 815, provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in FASB Accounting Standards Update ("ASU") 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.
Property and Equipment	Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Software Development Costs	Software Development Costs The Company accounts for software development costs for internal-use software under the provisions of ASC 350-40, Internal-Use Software. Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable.
Goodwill	Goodwill Goodwill relates to amounts that arose in connection with the Company’s various business combinations and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, including a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. Additionally, the reorganization or change in the number of reporting units could result in the reassignment of goodwill between reporting units and may trigger an impairment assessment. In accordance with ASC 350, Intangibles—Goodwill and Other , or ASC 350, the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. Under U.S. GAAP, a reporting unit is either the equivalent of, or one level below, an operating segment. As of December 31, 2016, the Company determined it operates in two segments and that each segment is its own reporting unit, and as such, the Company has two reporting units, email marketing and web presence. The provisions of ASC 350 require that a two-step impairment test be performed for goodwill. In the first step, the Company compares the fair value of its reporting unit to which goodwill has been allocated to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. As of December 31, 2016, the Company determined fair values for each of the reporting units based on consideration of the income approach, the market comparable approach and the market transaction approach. For purposes of the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses its internal forecasts to estimate future after-tax cash flows and include an estimate of long-term future growth rates based on its most recent views of the long-term outlook for each reporting unit. Actual results may differ from those assumed in our forecasts. The Company derived its discount rates using the weighted average cost of capital, using betas observed in its industry and published rates for industries relevant to our reporting units. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the respective business and its internally developed forecasts. Discount rates used in the Company's reporting unit valuations ranged from 11.0% to 12.0% . For purposes of the market approach, the Company uses a valuation technique in which values are derived based on market prices of comparable publicly traded companies. The Company also uses a market based valuation technique in which values are determined based on relevant observable information generated by market transactions involving comparable businesses. The Company assesses each valuation methodology based upon the relevance and availability of the data at the time it performs the valuation and weights the methodologies appropriately. The carrying values of the reporting units were determined through specific allocation of assets and liabilities to the reporting units, and an apportionment method relating to our debt, whereby debt that was incurred in order to finance the acquisition of assets or businesses of a reporting unit was allocated to that reporting unit. In prior years, the Company had only one reporting unit. Subsequent to the acquisition of Constant Contact, and as described in Note 19: Segment Information , the Company determined that there is a second reporting unit relating to email marketing. The Company has allocated the fair value of the goodwill acquired through its acquisitions to the applicable reporting unit, and allocated the fair value of the goodwill acquired through its acquisition of Constant Contact to its email marketing reporting unit.
Long-Lived Assets	Long-Lived Assets The Company’s long-lived assets consist primarily of intangible assets, including acquired subscriber relationships, trade names, intellectual property, developed technology, domain names available for sale and in-process research and development (“IPR&D”). The Company also has long-lived tangible assets, primarily consisting of property and equipment. The majority of the Company’s intangible assets are recorded in connection with its various acquisitions. The Company’s intangible assets are recorded at fair value at the time of their acquisition. The Company amortizes intangible assets over their estimated useful lives. Determination of the estimated useful lives of the individual categories of intangible assets is based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives other than developed technology is recognized in accordance with their estimated projected cash flows. Developed technology is amortized on a straight line basis over the estimated useful economic life which has a weighted average useful life of 7 years . The Company evaluates long-lived intangible and tangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. During the three and nine months ended September 30, 2017, the Company recognized an impairment charge of $13.8 million relating to certain domain name intangible assets acquired in 2014, which was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with this intangible asset. During the nine months ended September 30, 2016, the Company determined that a portion of an internally developed software tool would not meet its needs following the acquisition of Constant Contact, resulting in an impairment charge of $2.0 million which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Additionally, during the nine months ended September 30, 2016, the Company recognized an impairment charge of $4.9 million relating to internally developed software and developed technology relating to Webzai Ltd. (“Webzai”) acquisition, which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. In total, during the nine months ended September 30, 2016, the Company incurred impairment charges of $8.3 million , which includes the $2.0 million charge to abandon a portion of the internally developed software tool and a $4.9 million charge relating to the Webzai software and developed technology, both mentioned above, and a charge of $1.4 million to impair certain acquired IPR&D projects from the Webzai acquisition that were abandoned during the three months ended March 31, 2016. 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 nine months ended September 30, 2016 , the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired as these projects were abandoned during the three months ended March 31, 2016. At that time, the Company recorded a $ 1.4 million impairment charge, which is reflected in engineering and development expense in the Company’s consolidated statements of operations and comprehensive loss.
Revenue Recognition	Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period, whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of FASB ASU No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force, and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, and other cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The Company analyzes the selling prices used in its allocation of transaction amount, at a minimum, on a quarterly basis. Selling prices are analyzed on a more frequent basis if a significant change in the business necessitates a more timely analysis. The Company maintains a reserve for refunds and chargebacks related to revenue that has been recognized and is expected to be refunded. The Company had a refund and chargeback reserve of $0.6 million and $0.5 million as of December 31, 2016 and September 30, 2017 , respectively. The portion of deferred revenue that is expected to be refunded at December 31, 2016 and September 30, 2017 was $2.1 million and $2.0 million , respectively. Based on refund history, approximately 84% of all refunds happen in the same fiscal month that the contract starts or renews, and approximately 95% of all refunds happen within 45 days of the contract start or renewal date.
Income Taxes	Income Taxes Income taxes are accounted for in accordance with ASC 740, Accounting for Income Taxes , or ASC 740. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. ASC 740 clarifies the accounting for income taxes by prescribing a minimum recognition threshold that a tax position is required to meet before being recognized in the financial statements. The Company recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is more likely than not to be realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. There were nonrecognized tax benefits in the three and nine months ended September 30, 2016 and 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses.
Stock-Based Compensation	Stock-Based Compensation The Company may issue restricted stock units, restricted stock awards and stock options which vest upon the satisfaction of a performance condition and/or a service condition. The Company follows the provisions of ASC 718, Compensation—Stock Compensation , or ASC 718, which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods, net of estimated forfeitures. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. In addition, for stock-based awards where vesting is dependent upon achieving certain performance goals, the Company estimates the likelihood of achieving the performance goals against established performance targets. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards granted, the Company estimates the fair value of each restricted stock award based on the closing trading price of its common stock on the date of grant.
Net Loss per Share	Net Loss per Share The Company considered ASC 260-10, Earnings per Share , or ASC 260-10, which requires the presentation of both basic and diluted earnings per share in the consolidated statements of operations and comprehensive loss. The Company’s basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period, and, if there are dilutive securities, diluted income per share is computed by including common stock equivalents which includes shares issuable upon the exercise of stock options, net of shares assumed to have been purchased with the proceeds, using the treasury stock method.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - Recently Adopted In March 2016, the FASB issued ASU No. 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the consolidated statements of cash flows. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016 which required it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that included the interim period of adoption. The impact of the adoption resulted in the following: • Due to the Company's net shortfall position upon the time of adoption, the new standard resulted in additional tax expense in our provision for income taxes rather than paid-in capital of $0.9 million for the year ended December 31, 2016. The Company's beginning retained earnings was not impacted by the early adoption as the Company had a full valuation allowance against the U.S. deferred tax assets as of December 31, 2015. • As a result of prior guidance that required excess tax benefits reduce taxes payable prior to recognition as an increase in paid in capital, the Company had not recognized certain deferred tax assets (loss carry-forwards) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. As of January 1, 2016, the Company had generated federal and state net operating loss carry-forwards due to excess tax benefits of $1.5 million and $0.7 million , respectively. • The Company elected to eliminate the forfeiture rate and adopted the new policy to account for forfeitures in the period that they are incurred, and applied this policy on a modified retrospective basis. The impact of eliminating the forfeiture rate increased the stock compensation recorded in 2016 by $0.9 million , which included an immaterial prior period adjustment that the Company recorded through the consolidated statement of operations and comprehensive loss for the year ended December 31, 2016. In March 2016, the FASB issued ASU No. 2016-07, Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . This new guidance removes the requirement for retroactive adjustment when an increase or decrease in the level of ownership qualifies an investment for the equity method. This amendment is effective for fiscal years beginning after December 15, 2016. The adoption of this standard did not have a material impact on the Company's financial position or results of operations. Recent Accounting Pronouncements - Recently Issued In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU 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), and 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 "modified retrospective approach"). 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 small portion of its revenue recognition will be impacted by this new guidance. The Company has completed an initial quantification of the changes from adoption of ASU 2014-09, and believes that the deferral of certain sales incentive payments may materially impact the timing of expenses in the initial periods following adoption, and that future revenues will not be materially impacted by this adoption. Further, the Company expects to adopt ASU 2014-09 under the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . This new standard enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases . The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but expects that adoption will increase its assets and liabilities. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments . This new standard clarifies certain statement of cash flow presentation issues. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory . This new standard improves the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This amendment is effective for annual periods beginning after December 15, 2018, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows: Restricted Cash . This new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and restricted cash. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment . This new standard eliminates the second step of the goodwill impairment test described in Note 2: Goodwill , and instead requires that the entity perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied on a prospective basis. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718) . This new standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. This amendment is effective for annual or interim periods in fiscal years beginning after December 15, 2017, and should be applied prospectively to an award modified on or after the adoption date. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This new guidance better aligns an entity's risk management activities and financial reporting for hedging relationships through changes to the designation and measurement guidance for qualifying hedging relationships and to the method of presenting hedge results. The amendments in this guidance require an entity to present the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported, to allow users to better understand the results and costs of an entity's hedging program. This new guidance is effective for fiscal years beginning after December 15, 2019. The amended presentation and disclosure guidance is required only prospectively, while the measurement guidance should be applied to hedges existing at the time of adoption through a one-time cumulative-effect adjustment to accumulated other comprehensive income with respect to the elimination of the separate measurement of ineffectiveness with a corresponding adjustment to the opening balance of the retained earnings. The Company is currently evaluating the impact of its pending adoption of the new guidance on its consolidated financial statements.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Estimated Useful Lives	Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Summary of Calculation of Basic and Diluted Net Loss Per Share	Three Months Ended Nine Months Ended 2016 2017 2016 2017 (unaudited) (in thousands, except share amounts and per share data) Net loss attributable to Endurance International Group Holdings, Inc. $ (31,737 ) $ (40,264 ) $ (37,966 ) $ (114,781 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic net loss per share attributable to Endurance International Group Holdings, Inc. $ (0.24 ) $ (0.29 ) $ (0.29 ) $ (0.84 ) Diluted net loss per share attributable to Endurance International Group Holdings, Inc. $ (0.24 ) $ (0.29 ) $ (0.29 ) $ (0.84 ) Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.: Basic 133,550,168 137,793,609 133,038,542 136,688,115 Diluted 133,550,168 137,793,609 133,038,542 136,688,115
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 September 30, Nine Months Ended September 30, 2016 2017 2016 2017 (unaudited) Restricted stock awards and units 9,554,260 7,782,806 8,605,808 6,974,708 Options 12,050,726 10,593,596 10,673,967 10,947,661 Total 21,604,986 18,376,402 19,279,775 17,922,369

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Summary of Deferred Consideration Related to Acquisition	Components of short-term and long-term deferred consideration as of December 31, 2016 and September 30, 2017 , consisted of the following: December 31, 2016 September 30, 2017 Short- term Long- term Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — $ — — Verio (Acquired in 2015) 50 — — — Social Booster (Acquired in 2016) 40 25 25 — AppMachine (Acquired in 2016) 4,365 7,419 4,294 3,493 Total $ 5,273 $ 7,444 $ 4,319 $ 3,493

Property and Equipment and Ca31

Property and Equipment and Capital Lease Obligations (Tables)	9 Months Ended
	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Components of property and equipment consisted of the following: December 31, 2016 September 30, 2017 (in thousands) Land $ 790 $ 790 Building 5,517 6,242 Software 52,130 67,987 Computers and office equipment 143,091 148,460 Furniture and fixtures 10,892 10,840 Leasehold improvements 21,244 22,202 Construction in process 6,691 10,579 Property and equipment—at cost 240,355 267,100 Less accumulated depreciation (145,083 ) (178,543 ) Property and equipment—net $ 95,272 $ 88,557

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Basis of Fair Value Measurements	Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration (included in deferred consideration) $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at September 30, 2017 Financial assets: Interest rate cap (included in other assets) $ 187 — $ 187 $ — Total financial assets $ 187 $ — $ 187 $ —
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 September 30, 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2016 $ 818 Payment of contingent earn-outs related to 2012 acquisition (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at September 30, 2017 $ —

Goodwill and Other Intangible33

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill Balances	The following table summarizes the changes in the Company’s goodwill balances from December 31, 2016 to September 30, 2017 for the Company’s two reporting units: Web Presence Unit Email Marketing Unit Total Amount Amount Amount (in thousands) (in thousands) (in thousands) Goodwill balance at December 31, 2016 $ 1,255,604 $ 604,305 $ 1,859,909 Goodwill related to 2016 acquisitions — — — Foreign translation impact 2,580 — 2,580 Goodwill balance at September 30, 2017 $ 1,258,184 $ 604,305 $ 1,862,489
Summary of Other Intangible Assets	At September 30, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,858 $ 137,578 $ 148,280 7 years Subscriber relationships 659,754 408,979 250,775 7 years Trade-names 134,056 68,288 65,768 8 years Intellectual property 34,315 26,670 7,645 5 years Domain names available for sale 30,362 6,794 23,568 Indefinite Leasehold interests 314 314 — 1 year Total September 30, 2017 $ 1,144,659 $ 648,623 $ 496,036 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

Notes Payable (Tables)

Notes Payable (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	As of December 31, 2016 and September 30, 2017 , the Notes had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (15,711 ) Unamortized original issuance discount (6,282 ) (5,832 ) Net Senior Notes 326,480 328,457 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 328,457 As of December 31, 2016 and September 30, 2017 , the 2013 First Lien had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ — As of December 31, 2016 and September 30, 2017 , the Incremental First Lien had an outstanding balance of: At December 31, 2016 At September 30, 2017 (in thousands) Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issuance discount (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — At December 31, 2016 and September 30, 2017 , notes payable, net of original issuance discount and deferred financing costs, consisted of the following: At December 31, 2016 At September 30, 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,625,746 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Notes 326,480 328,457 Revolving credit facilities — — Total notes payable 1,986,980 1,954,203 Current portion of notes payable 35,700 33,945 Notes payable - long term $ 1,951,280 $ 1,920,258 As of September 30, 2017 , the 2017 First Lien had an outstanding balance of: At September 30, 2017 (in thousands) 2017 First Lien Term Loan $ 1,670,277 Unamortized deferred financing costs (23,483 ) Unamortized original issue discount (21,048 ) Net 2017 First Lien Term Loan 1,625,746 Current portion of 2017 First Lien Term Loan (33,945 ) 2017 First Lien Term Loan - long term $ 1,591,801
Summary of Future Debt Maturities	The maturity of the notes payable at September 30, 2017 is as follows: Amounts maturing in: (in thousands) (Remainder of) 2017 $ 8,486 2018 33,945 2019 33,945 2020 33,945 2021 33,945 Thereafter 1,876,011 Total $ 2,020,277
Summary of Interest Rates and Interest Expense	The following table provides a summary of interest rates and interest expense for the three and nine months ended September 30, 2016 and 2017 : Three Months Ended September 30, 2016 Three Months Ended September 30, 2017 Nine Months Ended September 30, 2016 Nine Months Ended September 30, 2017 (percentage per annum) Interest rate—LIBOR 4.49%-6.48% 5.14%-5.32% 4.49%-7.75% 5.14%-6.68% Interest rate—reference 6.50% * 6.50%-8.75% * Interest rate—Senior Notes 10.875 % 10.875 % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % 0.50 % (dollars in thousands) Interest expense and service fees $ 37,603 $ 32,551 $ 103,111 $ 105,371 Loss on extinguishment of debt — — — 992 Deferred financing fees immediately expensed — — — 5,487 Amortization of deferred financing fees 1,760 1,873 4,322 5,403 Amortization of original issue discounts 844 1,059 2,116 2,791 Amortization of net present value of deferred consideration 844 127 2,426 504 Other interest expense 157 238 598 474 Total interest expense $ 41,208 $ 35,848 $ 112,573 $ 121,022 * The Company did not have debt bearing interest based on the reference rate for the three months and nine months ended September 30, 2017.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Summary of Changes in Stockholders' Equity	The following table presents the changes in total stockholders’ equity: Total Stockholders’ Equity (in thousands) Balance at December 31, 2016 $ 124,383 Stock-based compensation 47,151 Reclassification of stock-compensation liability award 450 Stock option exercises 1,548 Foreign currency translation adjustment 2,984 Unrealized loss on derivative (309 ) Net loss attributable to non-controlling interest 277 Net loss attributable to Endurance International Group Holdings, Inc. (114,781 ) Balance at September 30, 2017 $ 61,703

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2017
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Restricted Stock Awards and Restricted Stock Units	The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the nine months ended September 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 100,369 $ 12.00 Granted 3,827,439 $ 7.92 Vested and unissued (553,774 ) $ 7.93 Canceled (265,070 ) $ 7.85 Non-vested at September 30, 2017 3,108,964 $ 7.94
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 nine months ended September 30, 2017 : Restricted Stock Weighted Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (1,969,623 ) $ 10.70 Canceled (200,934 ) $ 11.89 Non-vested at September 30, 2017 5,322,408 $ 14.03
2011 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of Total Stock-Based Compensation Expense	The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) Cost of revenue $ 1,643 $ 1,553 $ 4,116 $ 4,720 Sales and marketing 1,850 2,263 6,249 7,027 Engineering and development 4,164 1,807 6,369 4,707 General and administrative 7,149 13,956 31,484 32,295 Total stock-based compensation expense $ 14,806 $ 19,579 $ 48,218 $ 48,749
Summary of Stock Options	The following table provides a summary of the Company’s stock options as of September 30, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the nine months ended September 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted/ Exchanged 14,724 $ 8.15 Exercised (263,067 ) $ 5.89 Forfeited (502,142 ) $ 10.11 Expired (84,708 ) $ 10.24 Outstanding at September 30, 2017 1,096,637 $ 8.64 4.0 $ 847 Exercisable at September 30, 2017 642,775 $ 8.31 3.2 $ 695 Expected to vest after September 30, 2017 (1) 453,862 $ 9.12 5.1 $ 153 Exercisable as of September 30, 2017 and expected to vest (2) 1,096,637 $ 8.64 4.0 $ 847 (1) This represents the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of September 30, 2017 plus the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on September 30, 2017 of $8.20 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 nine months ended September 30, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted/ Exchanged 1,226,157 $ 7.98 Vested (602,930 ) $ 7.64 Canceled (550,287 ) $ 8.50 Non-vested at September 30, 2017 1,546,595 $ 8.25
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 September 30, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the nine months ended September 30, 2017 : Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value(3) (in thousands) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 728,287 $ 7.82 Exercised — $ — Forfeited (534,886 ) $ 12.71 Expired (288,891 ) $ 14.00 Outstanding at September 30, 2017 9,511,941 $ 12.38 7.0 $ 297 Exercisable at September 30, 2017 6,344,460 $ 12.86 6.3 $ 1 Expected to vest after September 30, 2017 (1) 3,167,481 $ 11.42 8.5 $ — Exercisable as of September 30, 2017 and expected to vest (2) 9,511,941 $ 12.38 7.0 $ 297 (1) This represents the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of September 30, 2017 plus the number of unvested options outstanding as of September 30, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of the Company’s common stock on September 30, 2017 of $8.20 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options.

Accumulated Other Comprehensi37

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income	The following table presents the components of accumulated other comprehensive loss (in thousands): Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2016 $ (2,395 ) $ (1,271 ) $ (3,666 ) Other comprehensive income (loss) 2,984 (309 ) 2,675 Balance at September 30, 2017 $ 589 $ (1,580 ) $ (991 )

Redeemable Non-controlling In38

Redeemable Non-controlling Interest (Tables)	9 Months Ended
	Sep. 30, 2017
Noncontrolling Interest [Abstract]
Schedule of Change in Redeemable Non-controlling Interest	The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling Interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Payment of redeemable non-controlling interest (25,000 ) Balance as of September 30, 2017 $ —

Severance and Other Exit Costs

Severance and Other Exit Costs (Tables)	9 Months Ended
	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Summary of Total Restructuring Charges Recorded in the Consolidated Statements of Operations and Comprehensive Loss	The following table presents restructuring charges recorded in the consolidated statements of operations and comprehensive loss for the periods presented: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2016 2017 2016 2017 (in thousands) Cost of revenue $ 3,127 $ 449 $ 8,729 $ 3,892 Sales and marketing 1,189 1,011 6,357 3,260 Engineering and development 1,014 271 4,256 1,349 General and administrative 1,047 2,758 4,300 6,083 Total restructuring charges $ 6,377 $ 4,489 $ 23,642 $ 14,584
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 nine months ended September 30, 2017 related to the Company’s combined restructuring plans' severance accrual: Employee Severance (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 633 $ 926 $ 1,559 Severance charges 8,804 4,083 12,887 Cash paid (4,530 ) (3,899 ) (8,429 ) Balance at September 30, 2017 $ 4,907 $ 1,110 $ 6,017
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 nine months ended September 30, 2017 related to the Company’s combined restructuring plans' facilities exit accrual: Facilities (in thousands) Web presence segment Email marketing segment Total Balance at December 31, 2016 $ 273 $ 8,747 $ 9,020 Facility adjustments 915 783 1,698 Sublease income received 532 — 532 Cash paid (973 ) (3,719 ) (4,692 ) Balance at September 30, 2017 $ 747 $ 5,811 $ 6,558

Related Party Transactions (Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2017
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Summary of Related Party Transactions	The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by Tregaron and its affiliates under these agreements: As of December 31, 2016 , approximately $1.3 million was included in accounts payable and accrued expense relating to services provided by Tregaron. As of September 30, 2017 , approximately $1.5 million was included in accounts payable and accrued expense relating to services provided by Tregaron. Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Cost of revenue $ 3,000 $ 3,100 $ 9,400 $ 9,100 Sales and marketing 150 500 350 1,000 Engineering and development 300 200 900 850 General and administrative 100 50 200 150 Total related party transaction expense, net $ 3,550 $ 3,850 $ 10,850 $ 11,100
Director
Related Party Transaction [Line Items]
Summary of Related Party Transactions	The following table presents the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the periods presented relating to services provided by IBS and its affiliates under these agreements: Three Months Ended Nine Months Ended 2016 2017 2016 2017 (in thousands) (in thousands) Revenue $ (900 ) $ (1,050 ) $ (2,200 ) $ (2,150 ) Revenue (contra) 1,800 1,850 5,900 4,050 Total related party transaction impact to revenue $ 900 $ 800 $ 3,700 $ 1,900 Cost of revenue 150 150 500 350 Total related party transaction expense, net $ 1,050 $ 950 $ 4,200 $ 2,250

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables contain financial information for each reportable segment for the three months and nine months ended September 30, 2016 and 2017 : Three Months Ended Three Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 195,275 $ 95,918 $ 291,193 $ 193,696 $ 101,526 $ 295,222 Gross profit $ 89,059 $ 52,707 $ 141,766 $ 71,071 $ 65,286 $ 136,357 Net loss $ (19,886 ) $ (9,912 ) $ (29,798 ) $ (42,466 ) $ 2,202 $ (40,264 ) Interest expense, net (1) 18,244 22,802 41,046 15,131 20,514 35,645 Income tax (benefit) expense (1,435 ) (5,952 ) (7,387 ) 1,659 1,323 2,982 Depreciation 9,173 7,837 17,010 10,338 3,233 13,571 Amortization of other intangible assets 19,729 18,253 37,982 16,577 18,770 35,347 Stock-based compensation 12,703 2,103 14,806 17,912 1,668 19,580 Restructuring expenses 541 5,836 6,377 3,806 682 4,488 Transaction expenses and charges 159 — 159 — — — SEC investigations reserve — — — 5,249 2,751 8,000 Loss (gain) of unconsolidated entities (2) 5,018 — 5,018 (33 ) — (33 ) Impairment of other long-lived assets (3) — — — 14,448 — 14,448 Adjusted EBITDA $ 44,246 $ 40,967 $ 85,213 $ 42,621 $ 51,143 $ 93,764 Nine Months Ended Nine Months Ended Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Revenue $ 589,364 $ 229,655 $ 819,019 $ 584,217 $ 298,400 $ 882,617 Gross profit $ 265,610 $ 114,429 $ 380,039 $ 240,239 $ 188,181 $ 428,420 Net income (loss) $ 2,787 $ (51,934 ) $ (49,147 ) $ (99,232 ) $ (8,025 ) $ (107,257 ) Interest expense, net (1) 53,337 58,798 112,135 52,304 68,212 120,516 Income tax (benefit) expense (90,033 ) (31,187 ) (121,220 ) 16,203 (4,819 ) 11,384 Depreciation 27,248 19,694 46,942 30,101 10,632 40,733 Amortization of other intangible assets 59,252 46,427 105,679 48,857 55,697 104,554 Stock-based compensation 37,778 10,440 48,218 43,357 5,392 48,749 Restructuring expenses 1,501 22,141 23,642 9,842 4,742 14,584 Transaction expenses and charges 31,273 984 32,257 — 773 773 SEC investigations reserve — — — 5,249 2,751 8,000 (Gain) loss of unconsolidated entities (2) (5,368 ) — (5,368 ) (72 ) — (72 ) Impairment of other long-lived assets (3) 8,285 — 8,285 14,448 — 14,448 Adjusted EBITDA $ 126,060 $ 75,363 $ 201,423 $ 121,057 $ 135,355 $ 256,412 As of December 31, 2016 As of September 30, 2017 Web presence Email marketing Total Web presence Email marketing Total (in thousands) (in thousands) Total assets $1,507,977 $1,248,297 $2,756,274 $1,422,268 $1,228,831 $2,651,099 (1) Interest expense includes impact of amortization of deferred financing costs, original issuance discounts and interest income. For the nine months ended September 30, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (2) The loss (gain) of unconsolidated entities is reported on a net basis for the three and nine months ended September 30, 2016. The three months ended September 30, 2016 includes a loss of $4.8 million on our investment in AppMachine. This loss was generated on July 27, 2016, when we increased our ownership stake in AppMachine from 40.0% to 100.0% , which required a revaluation of our existing investment to its implied fair value. The three months ended September 30, 2016 also includes a net loss of $0.2 million from our proportionate share of net loses from unconsolidated entities. The nine months ended September 30, 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 49.0% 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 $1.2 million . (3) The impairment of other long-lived assets for the three and nine months ended September 30, 2016 includes $6.3 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the three and nine months ended September 30, 3017 includes $13.8 million related to certain domain name intangible assets, and $0.6 million to write off a debt investment in a privately held entity.

Supplemental Guarantor Financ42

Supplemental Guarantor Financial Information (Tables)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements	The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and September 30, 2017, supplemental condensed consolidating results of operations for the three months and nine ended September 30, 2016 and 2017, and cash flow information for the nine months ended September 30, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 $ — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 461 $ 1 $ 54,881 $ 15,178 $ — $ 70,521 Restricted cash — — 2,472 175 — 2,647 Accounts receivable — — 10,817 3,167 — 13,984 Prepaid domain name registry fees — — 29,367 26,390 (15 ) 55,742 Prepaid expenses & other current assets 32 28 18,040 11,070 — 29,170 Total current assets 493 29 115,577 55,980 (15 ) 172,064 Intercompany receivables, net 32,723 680,824 (566,701 ) (146,846 ) — — Property and equipment, net — — 73,717 14,840 — 88,557 Goodwill — — 1,685,981 176,508 — 1,862,489 Other intangible assets, net — — 483,397 12,261 378 496,036 Investment in subsidiaries 28,476 1,311,664 43,652 — (1,383,792 ) — Other assets — 3,831 21,684 6,438 — 31,953 Total assets $ 61,692 $ 1,996,348 $ 1,857,307 $ 119,181 $ (1,383,429 ) $ 2,651,099 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 11,577 $ 1,820 $ — $ 13,397 Accrued expenses and other current liabilities — 14,596 68,949 10,179 — 93,724 Deferred revenue — — 315,534 53,104 (25 ) 368,613 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 3,166 — — 3,166 Deferred consideration, short-term — — 4,294 25 — 4,319 Total current liabilities — 48,541 403,520 65,128 (25 ) 517,164 Deferred revenue, long-term — — 81,155 9,749 — 90,904 Notes payable — 1,920,258 — — — 1,920,258 Capital lease obligations — — 1,485 — — 1,485 Deferred consideration — — 3,493 — — 3,493 Other long-term liabilities — (927 ) 56,367 652 — 56,092 Total liabilities — 1,967,872 546,020 75,529 (25 ) 2,589,396 Equity 61,692 28,476 1,311,287 43,652 (1,383,404 ) 61,703 Total liabilities and equity $ 61,692 $ 1,996,348 $ 1,857,307 $ 119,181 $ (1,383,429 ) $ 2,651,099 Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 258,366 $ 34,213 $ (1,386 ) $ 291,193 Cost of revenue — — 127,750 23,191 (1,514 ) 149,427 Gross profit — — 130,616 11,022 128 141,766 Operating expense: Sales and marketing — — 62,737 12,614 (10 ) 75,341 Engineering and development — — 21,802 2,186 — 23,988 General and administrative — 67 29,640 3,692 — 33,399 Transaction costs — — 159 — — 159 Total operating expense — 67 114,338 18,492 (10 ) 132,887 (Loss) income from operations — (67 ) 16,278 (7,470 ) 138 8,879 Interest expense and other income, net — 40,206 5,738 (53 ) — 45,891 (Loss) income before income taxes and equity earnings of unconsolidated entities — (40,273 ) 10,540 (7,417 ) 138 (37,012 ) Income tax (benefit) expense — (13,971 ) 6,401 183 — (7,387 ) (Loss) income before equity earnings of unconsolidated entities — (26,302 ) 4,139 (7,600 ) 138 (29,625 ) Equity loss (income) of unconsolidated entities, net of tax 31,875 5,573 7,772 110 (45,157 ) 173 Net (loss) income $ (31,875 ) $ (31,875 ) $ (3,633 ) $ (7,710 ) $ 45,295 $ (29,798 ) Net loss attributable to non-controlling interest — — 1,939 — — 1,939 Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (31,875 ) $ (31,875 ) $ (5,572 ) $ (7,710 ) $ 45,295 $ (31,737 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 112 — 112 Unrealized gain on cash flow hedge, net of taxes — 72 — — — 72 Total comprehensive (loss) income $ (31,875 ) $ (31,803 ) $ (5,572 ) $ (7,598 ) $ 45,295 $ (31,553 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Nine months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 720,149 $ 101,913 $ (3,043 ) $ 819,019 Cost of revenue — — 374,010 68,548 (3,578 ) 438,980 Gross profit — — 346,139 33,365 535 380,039 Operating expense: Sales and marketing — — 179,714 55,256 (26 ) 234,944 Engineering and development — — 55,583 12,347 — 67,930 General and administrative — 187 97,694 10,627 — 108,508 Transaction costs — — 32,257 — — 32,257 Total operating expense — 187 365,248 78,230 (26 ) 443,639 (Loss) income from operations — (187 ) (19,109 ) (44,865 ) 561 (63,600 ) Interest expense and other income, net — 109,547 (3,839 ) (138 ) — 105,570 (Loss) income before income taxes and equity earnings of unconsolidated entities — (109,734 ) (15,270 ) (44,727 ) 561 (169,170 ) Income tax (benefit) expense — (40,840 ) (80,037 ) (343 ) — (121,220 ) (Loss) income before equity earnings of unconsolidated entities — (68,894 ) 64,767 (44,384 ) 561 (47,950 ) Equity loss (income) of unconsolidated entities, net of tax 38,528 (30,366 ) 45,581 202 (52,748 ) 1,197 Net (loss) income $ (38,528 ) $ (38,528 ) $ 19,186 $ (44,586 ) $ 53,309 $ (49,147 ) Net loss attributable to non-controlling interest — — (11,181 ) — — (11,181 ) Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (38,528 ) $ (38,528 ) $ 30,367 $ (44,586 ) $ 53,309 $ (37,966 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 994 — 994 Unrealized loss on cash flow hedge, net of taxes — (1,866 ) — — — (1,866 ) Total comprehensive (loss) income $ (38,528 ) $ (40,394 ) $ 30,367 $ (43,592 ) $ 53,309 $ (38,838 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Three months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 266,985 $ 30,019 $ (1,782 ) $ 295,222 Cost of revenue — — 139,044 21,155 (1,334 ) 158,865 Gross profit — — 127,941 8,864 (448 ) 136,357 Operating expense: Sales and marketing — — 61,376 4,900 — 66,276 Engineering and development — — 17,412 2,470 — 19,882 General and administrative — 56 50,353 1,465 (605 ) 51,269 Transaction costs — — — — — — Total operating expense — 56 129,141 8,835 (605 ) 137,427 (Loss) income from operations — (56 ) (1,200 ) 29 157 (1,070 ) Interest expense and other income, net — 35,661 756 (172 ) — 36,245 (Loss) income before income taxes and equity earnings of unconsolidated entities — (35,717 ) (1,956 ) 201 157 (37,315 ) Income tax (benefit) expense — (13,201 ) 15,494 689 — 2,982 (Loss) income before equity earnings of unconsolidated entities — (22,516 ) (17,450 ) (488 ) 157 (40,297 ) Equity loss (income) of unconsolidated entities, net of tax 40,422 17,906 456 — (58,817 ) (33 ) Net (loss) income $ (40,422 ) $ (40,422 ) $ (17,906 ) $ (488 ) $ 58,974 $ (40,264 ) Net loss attributable to non-controlling interest — — — — — — Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (40,422 ) $ (40,422 ) $ (17,906 ) $ (488 ) $ 58,974 $ (40,264 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 1,070 — 1,070 Unrealized gain on cash flow hedge, net of taxes — 83 — — — 83 Total comprehensive (loss) income $ (40,422 ) $ (40,339 ) $ (17,906 ) $ 582 $ 58,974 $ (39,111 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Nine months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 788,806 $ 98,321 $ (4,510 ) $ 882,617 Cost of revenue — — 392,447 65,392 (3,642 ) 454,197 Gross profit — — 396,359 32,929 (868 ) 428,420 Operating expense: Sales and marketing — — 195,392 15,765 (3 ) 211,154 Engineering and development — — 51,053 9,340 — 60,393 General and administrative — 166 123,736 7,632 (605 ) 130,929 Transaction costs — — 773 — — 773 Total operating expense — 166 370,954 32,737 (608 ) 403,249 (Loss) income from operations — (166 ) 25,405 192 (260 ) 25,171 Interest expense and other income, net — 120,313 1,150 (347 ) — 121,116 (Loss) income before income taxes and equity earnings of unconsolidated entities — (120,479 ) 24,255 539 (260 ) (95,945 ) Income tax (benefit) expense — (44,512 ) 54,744 1,152 — 11,384 Loss before equity earnings of unconsolidated entities — (75,967 ) (30,489 ) (613 ) (260 ) (107,329 ) Equity loss (income) of unconsolidated entities, net of tax 106,999 31,033 543 — (138,647 ) (72 ) Net (loss) income $ (106,999 ) $ (107,000 ) $ (31,032 ) $ (613 ) $ 138,387 $ (107,257 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net (loss) income attributable to Endurance International Group Holdings, Inc. $ (106,999 ) $ (107,000 ) $ (38,556 ) $ (613 ) $ 138,387 $ (114,781 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 2,984 — 2,984 Unrealized loss on cash flow hedge, net of taxes — (309 ) — — — (309 ) Total comprehensive (loss) income $ (106,999 ) $ (107,309 ) $ (38,556 ) $ 2,371 $ 138,387 $ (112,106 ) Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash (used in) provided by operating activities $ — $ (54,904 ) $ 187,068 $ (30,360 ) $ — $ 101,804 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (889,634 ) — — (889,634 ) Purchases of property and equipment — — (25,362 ) (3,955 ) — (29,317 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 240 2 — 242 Proceeds from note receivable — — — — — — Proceeds from sale of assets — — — — — — Purchases of intangible assets — — (10 ) (17 ) — (27 ) Net withdrawals of principal balances in restricted cash accounts — — (347 ) (391 ) — (738 ) Net cash used in investing activities — — (920,713 ) (4,361 ) — (925,074 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,105,678 — — — 1,105,678 Repayment of notes payable and revolver — (125,775 ) — — — (125,775 ) Payment of financing costs — (52,561 ) — — — (52,561 ) Payment of deferred consideration — — (42,411 ) (669 ) — (43,080 ) Payment of redeemable non-controlling interest liability — — (33,425 ) — — (33,425 ) Principal payments on capital lease obligations — — (4,372 ) — — (4,372 ) Proceeds from exercise of stock options 2,304 — — — — 2,304 Capital investments from minority partner — — — 2,776 — 2,776 Intercompany loans and investments (2,313 ) (872,490 ) 840,305 34,498 — — Net cash (used in) provided by financing activities (9 ) 54,852 760,097 36,605 — 851,545 Net effect of exchange rate on cash and cash equivalents — — — 1,843 — 1,843 Net (decrease) increase in cash and cash equivalents (9 ) (52 ) 26,452 3,727 — 30,118 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 — 33,030 End of period $ 3 $ 15 $ 47,738 $ 15,392 $ — $ 63,148 Condensed Consolidating Statement of Cash Flows Nine months ended September 30, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash (used in) provided by operating activities $ (32 ) $ (72,687 ) $ 204,768 $ (3,183 ) $ — $ 128,866 Cash flows from investing activities: Purchases of property and equipment — — (28,140 ) (3,955 ) — (32,095 ) Proceeds from sale of property and equipment — — 292 — — 292 Purchases of intangible assets — — (1,932 ) (34 ) — (1,966 ) Net deposits of principal balances in restricted cash accounts — — 148 507 — 655 Net cash used in investing activities — — (29,632 ) (3,482 ) — (33,114 ) Cash flows from financing activities: — Proceeds from issuance of term loan and notes, net of original issue discounts — 1,693,007 — — — 1,693,007 Repayment of term loans — (1,733,147 ) — — — (1,733,147 ) Payment of financing costs — (6,304 ) — — — (6,304 ) Payment of deferred consideration — — (4,550 ) (858 ) — (5,408 ) Payment of redeemable non-controlling interest liability — — (25,000 ) — — (25,000 ) Principal payments on capital lease obligations — — (5,679 ) — — (5,679 ) Proceeds from exercise of stock options 1,548 — — — — 1,548 Intercompany loans and investments (1,058 ) 119,128 (124,060 ) 5,990 — — Net cash provided by (used in) financing activities 490 72,684 (159,289 ) 5,132 — (80,983 ) Net effect of exchange rate on cash and cash equivalents — — — 2,156 — 2,156 Net increase (decrease) in cash and cash equivalents 458 (3 ) 15,847 623 — 16,925 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 — 53,596 End of period $ 461 $ 1 $ 54,881 $ 15,178 $ — $ 70,521

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Sep. 30, 2017USD ($)Segment	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015Segment	Jun. 30, 2016USD ($)	Feb. 09, 2016USD ($)
Accounting Policies [Line Items]
Number of reportable segments | Segment				2		2	1
Software development cost capitalized	$ 2,200,000	$ 2,900,000		$ 8,400,000	$ 9,300,000
Goodwill impairment				0		$ 0
Goodwill	1,862,489,000			1,862,489,000		1,859,909,000
Impairment of other long-lived assets				$ 13,848,000	8,285,000
Contract service period				36 months
Reserves for refunds and chargebacks	500,000			$ 500,000		600,000
Deferred revenue expected to be refunded	2,000,000			$ 2,000,000		2,100,000
Percentage of deferred revenue refunded within same fiscal month				84.00%
Percentage of deferred revenue refunded within 45 days				95.00%
Unrecognized tax benefits								$ 0
Income tax examination interest expense	100,000	0		$ 100,000	0
Income tax examination penalties expense	100,000	0		$ 0	0
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income						142,700,000
Amount of net operating loss carry-forwards available to offset future state taxable income						$ 125,600,000
Developed technology
Accounting Policies [Line Items]
Weighted average useful life				7 years		7 years
Domain Name Intangible Assets
Accounting Policies [Line Items]
Impairment of other long-lived assets	13,800,000			$ 13,800,000
IPR&D
Accounting Policies [Line Items]
Impairment of other long-lived assets					8,300,000
Constant Contact, Inc.
Accounting Policies [Line Items]
Goodwill									$ 604,300,000
Impairment of other long-lived assets		$ 2,000,000			2,000,000
Webzai Limited
Accounting Policies [Line Items]
Impairment of other long-lived assets					4,900,000
Webzai Limited | Engineering and Development
Accounting Policies [Line Items]
Impairment of other long-lived assets			$ 1,400,000	0
Webzai Limited | Software Development and Internally Developed Technology
Accounting Policies [Line Items]
Impairment of other long-lived assets					$ 4,900,000
Webzai Limited | IPR&D
Accounting Policies [Line Items]
Impairment of other long-lived assets						$ 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	1,258,184,000			1,258,184,000		$ 1,255,604,000
Reporting unit, percentage of fair value in excess of carrying amount						67.00%
Email Marketing Unit
Accounting Policies [Line Items]
Goodwill	$ 604,305,000			$ 604,305,000		$ 604,305,000
Reporting unit, percentage of fair value in excess of carrying amount						35.00%
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)	9 Months Ended
	Sep. 30, 2017
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	35 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	5 years

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Summary of Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Net loss attributable to Endurance International Group Holdings, Inc.	$ (40,264)	$ (31,737)	$ (114,781)	$ (37,966)
Net loss per share attributable to Endurance International Group Holdings, Inc.:
Basic net income (loss) per share (in usd per share)	$ (0.29)	$ (0.24)	$ (0.84)	$ (0.29)
Diluted net income (loss) per share (in usd per share)	$ (0.29)	$ (0.24)	$ (0.84)	$ (0.29)
Weighted-average common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.:
Weighted average number of basic shares outstanding (in shares)	137,793,609	133,550,168	136,688,115	133,038,542
Weighted average number of diluted shares outstanding (in shares)	137,793,609	133,550,168	136,688,115	133,038,542

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	18,376,402	21,604,986	17,922,369	19,279,775
Restricted Stock Awards and Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	7,782,806	9,554,260	6,974,708	8,605,808
Stock Option Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	10,593,596	12,050,726	10,947,661	10,673,967

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Feb. 09, 2016	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 1,862,489	$ 1,859,909
Constant Contact, Inc.
Business Acquisition [Line Items]
Business acquisition price per share (in dollars per share)	$ 32
Enterprise value	$ 1,100,000
Goodwill	604,300
Property and equipment	39,600
Working capital	184,200
Deferred tax liability, net	125,100
Deferred revenue	25,200
Subscriber relationships | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	263,000
Developed technology | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	83,000
Trade-names | Constant Contact, Inc.
Business Acquisition [Line Items]
Purchase price of intangible assets	$ 52,000

Acquisitions - Summary of Defer

Acquisitions - Summary of Deferred Consideration Related to Acquisition (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Deferred consideration, short-term	$ 4,319	$ 5,273
Deferred consideration—long term	3,493	7,444
Mojoness Inc
Business Acquisition [Line Items]
Deferred consideration, short-term	0	818
Deferred consideration—long term	0	0
Verio
Business Acquisition [Line Items]
Deferred consideration, short-term	0	50
Deferred consideration—long term	0	0
Social Booster
Business Acquisition [Line Items]
Deferred consideration, short-term	25	40
Deferred consideration—long term	0	25
AppMachine
Business Acquisition [Line Items]
Deferred consideration, short-term	4,294	4,365
Deferred consideration—long term	$ 3,493	$ 7,419

Property and Equipment and Ca49

Property and Equipment and Capital Lease Obligations - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 267,100	$ 240,355
Less accumulated depreciation	(178,543)	(145,083)
Property and equipment—net	88,557	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	6,242	5,517
Software
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	67,987	52,130
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	148,460	143,091
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	10,840	10,892
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	22,202	21,244
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 10,579	$ 6,691

Property and Equipment and Ca50

Property and Equipment and Capital Lease Obligations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 13,571	$ 17,010	$ 40,733	$ 46,942
Capital lease included in software	24,600		24,600
Property under capital lease, net	$ 4,400		$ 4,400

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 818
Mojoness Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 800

Fair Value Measurements - Basis

Fair Value Measurements - Basis of Fair Value Measurements (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financial assets:
Interest rate cap (included in other assets)	$ 187	$ 979
Total financial assets	187	979
Financial liabilities:
Contingent earn-out consideration (included in deferred consideration)		818
Total financial liabilities		818
Significant Other Observable Inputs (Level 2)
Financial assets:
Interest rate cap (included in other assets)	187	979
Total financial assets	$ 187	979
Significant Unobservable Inputs (Level 3)
Financial liabilities:
Contingent earn-out consideration (included in deferred consideration)		818
Total financial liabilities		$ 818

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
December 31, 2016	$ 818
Payment of contingent earn-outs related to 2012 acquisition	(818)
Change in fair value of contingent earn-outs	0
September 30, 2017	$ 0

Derivatives And Hedging Activ54

Derivatives And Hedging Activities - Additional Information (Detail)	Dec. 09, 2015	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)Agreement	Sep. 30, 2016USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cap period	3 years
Gain on interest rate cash flow hedge ineffectiveness		$ 0		$ 0
Fair value of the interest rate contracts		200,000		200,000
Tax expense (benefit) on gain (loss) recognized		48,000	$ (65,000)	(182,000)	$ (889,000)
Interest expense		35,848,000	$ 41,208,000	121,022,000	$ 112,573,000
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loss to be reclassified as increase to interest expense in the next twelve months		1,600,000		$ 1,600,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate cap agreements | Agreement				1
Notional amount outstanding		500,000,000		$ 500,000,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Recognized loss				300,000
Tax expense (benefit) on gain (loss) recognized				(200,000)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense		$ 200,000		$ 300,000

Goodwill and Other Intangible55

Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)Segment	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015Segment
Finite-Lived Intangible Assets [Line Items]
Number of reportable segments | Segment			2		2	1
Amortization of other intangible assets	$ 35,347	$ 37,982	$ 104,554	$ 105,679
Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment of other long-lived assets				4,900
IPR&D
Finite-Lived Intangible Assets [Line Items]
Impairment of other long-lived assets				8,300
IPR&D | Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment charge of intangible assets				1,400
Impairment of other long-lived assets					$ 1,400
Developed technology | Webzai Limited
Finite-Lived Intangible Assets [Line Items]
Impairment of developed technology		$ 4,400		$ 4,400
Domain Name Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Impairment of other long-lived assets	$ 13,800		$ 13,800

Goodwill and Other Intangible56

Goodwill and Other Intangible Assets - Changes in Goodwill Balances (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,859,909
Goodwill related to 2016 acquisitions	0
Foreign translation impact	2,580
Goodwill, ending balance	1,862,489
Web Presence Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	1,255,604
Goodwill related to 2016 acquisitions	0
Foreign translation impact	2,580
Goodwill, ending balance	1,258,184
Email Marketing Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	604,305
Goodwill related to 2016 acquisitions	0
Foreign translation impact	0
Goodwill, ending balance	$ 604,305

Goodwill and Other Intangible57

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,144,659	$ 1,141,824
Accumulated Amortization	648,623	529,767
Net Carrying Amount	496,036	612,057
Domain names available for sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,362	29,954
Accumulated Amortization	6,794	4,976
Net Carrying Amount	$ 23,568	$ 24,978
Weighted average useful life	Indefinite	Indefinite
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 285,858	$ 284,005
Accumulated Amortization	137,578	111,348
Net Carrying Amount	$ 148,280	$ 172,657
Weighted average useful life	7 years	7 years
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 659,754	$ 659,662
Accumulated Amortization	408,979	345,070
Net Carrying Amount	$ 250,775	$ 314,592
Weighted average useful life	7 years	7 years
Trade-names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 134,056	$ 133,805
Accumulated Amortization	68,288	57,789
Net Carrying Amount	$ 65,768	$ 76,016
Weighted average useful life	8 years	8 years
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 34,315	$ 34,084
Accumulated Amortization	26,670	10,270
Net Carrying Amount	$ 7,645	$ 23,814
Weighted average useful life	5 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

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 27, 2016	May 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Apr. 08, 2016	Mar. 03, 2016	Jan. 06, 2016	Dec. 31, 2014	Aug. 31, 2014	Jan. 31, 2012
Schedule of Cost-method Investments [Line Items]
Investments			$ 15,200		$ 15,200		$ 15,900
Accounts payable			13,397		13,397		16,074
Equity loss (income) of unconsolidated entities, net of tax			$ (33)	$ 173	$ (72)	$ 1,197
Proportionate share exceed of the company's consolidated assets or income			10.00%		10.00%
Bluezone Labs, LLC
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition													$ 300
Ownership interest													25.00%
Purchase of products and services			$ 400	$ 400
Accounts payable			200		$ 200		100
Prepaid expense			800		$ 800		$ 0
WZ (UK) Ltd.
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition												$ 3,900
Ownership interest												49.00%
Ownership interest										57.50%
AppMachine
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition											$ 15,200
Ownership interest	100.00%										40.00%
Remaining percentage of acquisition	60.00%
Web and Money Management Solution
Schedule of Cost-method Investments [Line Items]
Convertible promissory note purchased									$ 600
Other than temporary impairment losses on investments			$ 600
Fortifico Limited
Schedule of Cost-method Investments [Line Items]
Amount of investment for acquisition								$ 5,000
Ownership interest							33.00%	33.00%
Impairment charges on remaining investments							$ 4,700
Minimum
Schedule of Cost-method Investments [Line Items]
Voting interest			20.00%		20.00%
Maximum
Schedule of Cost-method Investments [Line Items]
Voting interest			50.00%		50.00%
Automattic
Schedule of Cost-method Investments [Line Items]
Investment made on asset		$ 15,000
Percentage of outstanding shares invested		5.00%

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail)	Jun. 14, 2017USD ($)	Sep. 30, 2016USD ($)	Feb. 28, 2016	Feb. 09, 2016USD ($)	Nov. 30, 2013USD ($)	Feb. 08, 2016	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)repaymentprepayment	Sep. 30, 2016USD ($)	Jan. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Long-Term Debt [Line Items]
Repayments of long-term debt									$ 1,733,147,000	$ 42,775,000
Line of credit facility, unused capacity, commitment fee percentage							0.50%	0.50%	0.50%	0.50%
Interest expense							$ 35,848,000	$ 41,208,000	$ 121,022,000	$ 112,573,000
Interest expense and service fees							32,551,000	37,603,000	105,371,000	103,111,000
Financing costs expensed							0	$ 0	5,487,000	$ 0
Debt instrument alternate base rate								6.50%
Minimum
Long-Term Debt [Line Items]
Debt instrument alternate base rate										6.50%
Maximum
Long-Term Debt [Line Items]
Debt instrument alternate base rate										8.75%
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Debt issue price			97.00%
Debt instrument revised LIBOR rate			5.00%
Reference rate			4.00%
Basis revised spread on LIBOR rate			1.00%
Basis spread on reference rate			2.00%
Repayments of long-term debt		$ 3,700,000							3,700,000
Extinguishment of debt	$ 716,600,000
Long-term line of credit				$ 735,000,000
Converted instrument, rate				1.00%
Amortization rate				0.50%
Incremental First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate			1.00%
Incremental First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate			0.50%
Revolving Credit Facility
Long-Term Debt [Line Items]
Revolving credit facility maximum borrowing amount				$ 165,000,000	$ 125,000,000		165,000,000		$ 165,000,000			$ 165,000,000
Line of credit facility, unused capacity, commitment fee percentage					0.50%
Commitment fee percentage				0.50%
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Original note balance	$ 1,697,300,000
Debt issue price	99.75%
Debt instrument revised LIBOR rate	4.00%
Reference rate	3.00%
Basis revised spread on LIBOR rate	1.00%
Basis spread on reference rate	2.00%
Number of mandatory repayments | repayment									2
Repayments of long-term debt									$ 8,500,000
Number of voluntary prepayments | prepayment									2
Voluntary prepayments									$ 10,000,000
Debt issuance costs, gross							4,200,000		4,200,000
Unamortized debt issuance expense							$ 900,000		900,000
2017 First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate	1.00%
2017 First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate	0.50%
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Original note balance					$ 1,050,000,000
Debt instrument revised LIBOR rate						4.00%
Reference rate						3.00%
Basis revised spread on LIBOR rate			5.48%	5.23%		1.00%
Basis revised spread on reference rate			4.48%	4.23%
Basis spread on reference rate						2.00%
Repayments of long-term debt									2,600,000
Voluntary prepayments									2,600,000
Extinguishment of debt	$ 980,600,000
Interest expense and service fees									$ 1,000,000
2013 First Lien Term Loan | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate						1.00%
Interest rate, effective percentage						5.00%
2013 First Lien Term Loan | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate						0.50%
Alternate Base Rate Loans | Revolving Credit Facility
Long-Term Debt [Line Items]
Reference rate					5.25%
Basis revised spread on LIBOR rate				3.00%	1.00%
Basis spread on reference rate					2.50%
Alternate Base Rate Loans | Revolving Credit Facility | Federal Funds Effective Rate
Long-Term Debt [Line Items]
Basis spread on variable rate				0.50%	0.50%
LIBOR Based Interest Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Reference rate				4.00%	6.25%
LIBOR Based Interest Rate Loan | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Long-Term Debt [Line Items]
Basis spread on variable rate					1.50%
Basis revised spread on LIBOR rate				1.00%
Notes
Long-Term Debt [Line Items]
Original note balance				$ 350,000,000
Redemption price, percentage									101.00%
Par value percentage				98.065%
Interest rate, stated percentage		10.875%		10.875%			10.875%	10.875%	10.875%	10.875%
Senior notes											$ 350,000,000

Notes Payable - Schedule of Lon

Notes Payable - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Total	$ 1,954,203	$ 1,986,980
Current maturities	33,945	35,700
Excluding current maturities	1,920,258	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Total	1,625,746	0
Current maturities	33,945
Excluding current maturities	1,591,801
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Total	0	985,640
Current maturities	0	21,000
Excluding current maturities	0	964,640
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Total	0	674,860
Current maturities	0	14,700
Excluding current maturities	0	660,160
Notes
Long-Term Debt [Line Items]
Total	328,457	326,480
Current maturities	0	0
Excluding current maturities	328,457	326,480
Revolving credit facilities
Long-Term Debt [Line Items]
Total	$ 0	$ 0

Notes Payable Notes Payable-Sch

Notes Payable Notes Payable-Schedule of 2017 First Lien Term Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,020,277
Deferred financing costs	(39,194)	$ (43,342)
Total	1,954,203	1,986,980
Current maturities	(33,945)	(35,700)
Excluding current maturities	1,920,258	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	1,670,277
Unamortized deferred financing costs	(23,483)
Deferred financing costs	(21,048)
Total	1,625,746	$ 0
Current maturities	(33,945)
Excluding current maturities	$ 1,591,801

Notes Payable - Schedule of 201

Notes Payable - Schedule of 2013 First Term Lien Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,020,277
Total	1,954,203	$ 1,986,980
Current maturities	33,945	35,700
Long-term debt, excluding current maturities	1,920,258	1,951,280
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	0	985,875
Unamortized deferred financing costs	0	(235)
Total	0	985,640
Current maturities	0	21,000
Long-term debt, excluding current maturities	$ 0	$ 964,640

Notes Payable - Schedule of Inc

Notes Payable - Schedule of Incremental First Lien Term Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,020,277
Deferred financing costs	(39,194)	$ (43,342)
Total	1,954,203	1,986,980
Current maturities	33,945	35,700
Long-term debt, excluding current maturities	1,920,258	1,951,280
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Long-term debt, gross	0	720,300
Unamortized deferred financing costs	0	(25,869)
Deferred financing costs	0	(19,571)
Total	0	674,860
Current maturities	0	14,700
Long-term debt, excluding current maturities	$ 0	$ 660,160

Notes Payable - Schedule of Sen

Notes Payable - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Long-term debt, gross	$ 2,020,277
Deferred financing costs	(39,194)	$ (43,342)
Total	1,954,203	1,986,980
Current maturities	33,945	35,700
Long-term debt, excluding current maturities	1,920,258	1,951,280
Notes
Long-Term Debt [Line Items]
Long-term debt, gross	350,000	350,000
Unamortized deferred financing costs	(15,711)	(17,238)
Deferred financing costs	(5,832)	(6,282)
Total	328,457	326,480
Current maturities	0	0
Long-term debt, excluding current maturities	$ 328,457	$ 326,480

Notes Payable - Summary of Futu

Notes Payable - Summary of Future Debt Maturities (Detail) $ in Thousands	Sep. 30, 2017USD ($)
Debt Disclosure [Abstract]
(Remainder of) 2017	$ 8,486
2,018	33,945
2,019	33,945
2,020	33,945
2,021	33,945
Thereafter	1,876,011
Total	$ 2,020,277

Notes Payable - Schedule of Int

Notes Payable - Schedule of Interest Rates and Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Feb. 09, 2016
Long-Term Debt [Line Items]
Debt instrument alternate base rate		6.50%
Line of credit facility, unused capacity, commitment fee percentage	0.50%	0.50%	0.50%	0.50%
Interest expense and service fees	$ 32,551	$ 37,603	$ 105,371	$ 103,111
Loss on early extinguishment of debt	0	0	992	0
Financing costs expensed	0	0	5,487	0
Amortization of deferred financing fees	1,873	1,760	5,403	4,322
Amortization of original issue discounts	1,059	844	2,791	2,116
Amortization of net present value of deferred consideration	127	844	504	2,426
Other interest expense	238	157	474	598
Interest expense	$ 35,848	$ 41,208	$ 121,022	$ 112,573
Notes
Long-Term Debt [Line Items]
Interest rate, stated percentage	10.875%	10.875%	10.875%	10.875%	10.875%
Minimum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate	5.14%	4.49%	5.14%	4.49%
Debt instrument alternate base rate				6.50%
Maximum
Long-Term Debt [Line Items]
Debt instrument LIBOR rate	5.32%	6.48%	6.68%	7.75%
Debt instrument alternate base rate				8.75%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017vote
Equity [Abstract]
Number of votes per share	1

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholder's Equity [Roll Forward]
Stockholders' equity attributable to parent, beginning balance			$ 124,383
Stock-based compensation			47,151
Reclassification of stock-compensation liability award			450
Stock option exercises			1,548
Foreign currency translation adjustment	$ 1,070	$ 112	2,984	$ 994
Unrealized loss on derivative	83	72	(309)	(1,866)
Net (loss) income attributable to non-controlling interest	0	(1,206)	277	(14,326)
Net loss attributable to Endurance International Group Holdings, Inc.	(40,264)	$ (31,737)	(114,781)	$ (37,966)
Stockholders' equity attributable to parent, ending balance	$ 61,703		$ 61,703

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	Aug. 22, 2017	Aug. 11, 2017	Feb. 09, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share)				$ 0.0001		$ 0.0001			$ 0.0001
Stock-based compensation expense				$ 19,580,000	$ 14,806,000	$ 48,749,000	$ 48,218,000
2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				4,000,000		9,600,000
2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 0		$ 1,200,000
Chief Executive Officer | 2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting				0		0		3,693,754
Vested period of award shares				2 years 3 months 29 days				3 years
Number of RSUs expected to vest (in shares)				1,550,000		1,550,000
Chief Financial Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting						223,214
Chief Operating Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting						260,416
Chief Administrative Officer | 2016 Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting						148,810
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future awards (in shares)				38,000,000		38,000,000
Shares available for grant (in shares)				13,547,029		13,547,029
Stock options, granted (in shares)						728,287
2013 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 35,600,000		$ 35,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						2 years 2 months 12 days
Award shares granted for vesting						160,428
Vested (in shares)						1,969,623
Vesting period						4 years
2013 Stock Incentive Plan | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				17,900,000		$ 17,900,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						2 years 2 months 12 days
2013 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting						3,827,439
Vested (in shares)						553,774
2017 CEO Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 10,375,000		$ 2,200,000		$ 2,200,000
2017 CEO Award | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs expected to vest (in shares)				750,000		750,000
2017 CEO Award | Chief Executive Officer | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting	612,419
Vested period of award shares	3 years
2017 CEO Award | Chief Executive Officer | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting	1,032,500
Vested (in shares)	282,500
Vested period of award shares	3 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)				9,183,916		9,183,916
Common stock, par value (in usd per share)			$ 0.01
Stock options, granted (in shares)						14,724
Stock-based compensation expense						$ 22,300,000
2011 Stock Incentive Plan | Pre-Acquisition Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense						5,400,000
2011 Stock Incentive Plan | Post-Acquisition Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense						16,900,000
2011 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 10,700,000		$ 10,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						2 years 4 months 24 days
2011 Stock Incentive Plan | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 1,600,000		$ 1,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						2 years 1 month 6 days
Stock options, granted (in shares)			2,143,987
2011 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award shares granted for vesting			2,202,846			1,226,157
Vested (in shares)						602,930
Vesting period						4 years
Share-based Compensation Award, Tranche One | 2017 CEO Award | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards expected to vest outstanding (percent)				33.30%		33.30%
Share-based Compensation Award, Tranche One | 2017 CEO Award | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs expected to vest (in shares)				250,000		250,000
Share-based Compensation Award, Tranche Two | 2017 CEO Award | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs expected to vest (in shares)				250,000,000		250,000,000
Share-based Compensation Award, Tranche Three | 2017 CEO Award | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs expected to vest (in shares)				250,000,000		250,000,000
Minimum | 2013 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period						3 years
Maximum | 2013 Stock Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 19,580	$ 14,806	$ 48,749	$ 48,218
2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	19,579	14,806	48,749	48,218
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	1,553	1,643	4,720	4,116
Sales and marketing | 2011 And 2013 Stock Incentive Plan
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	2,263	1,850	7,027	6,249
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	1,807	4,164	4,707	6,369
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	$ 13,956	$ 7,149	$ 32,295	$ 31,484

Stock-Based Compensation - Su71

Stock-Based Compensation - Summary of Stock Options (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)$ / sharesshares
2013 Stock Incentive Plan
Stock Options
Beginning balance stock options, outstanding (in shares) | shares	9,607,431
Stock options, granted (in shares) | shares	728,287
Stock options, exercised (in shares) | shares	0
Stock options, forfeited (in shares) | shares	(534,886)
Stock options, expired (in shares) | shares	(288,891)
Ending balance stock options, outstanding (in shares) | shares	9,511,941
Stock options, exercisable (in shares) | shares	6,344,460
Stock options, expected to vest after September 30, 2017 (in shares) | shares	3,167,481
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in shares) | shares	9,511,941
Weighted- Average Exercise Price
Weighted - average exercise price, outstanding (in usd per share)	$ 12.79
Weighted - average exercise price, granted (in usd per share)	7.82
Weighted - average exercise price, exercised (in usd per share)	0
Weighted - average exercise price, forfeited (in usd per share)	12.71
Weighted - average exercise price, expired (in usd per share)	14
Weighted - average exercise price, outstanding (in usd per share)	12.38
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	12.86
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	11.42
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 12.38
Weighted - average remaining contractual term, outstanding	7 years 18 days
Weighted - average remaining contractual term, exercisable at March 31, 2017	6 years 3 months 23 days
Weighted - average remaining contractual term, expected to vest after March 31, 2017	8 years 6 months 17 days
Weighted - average remaining contractual term, exercisable as of March 31, 2017 and expected to vest thereafter	7 years 18 days
Aggregate intrinsic value, outstanding | $	$ 297
Aggregate intrinsic value, exercisable at March 31, 2017 | $	1
Aggregate intrinsic value, expected to vest after March 31, 2017 | $	0
Aggregate intrinsic value, exercisable as of March 31, 2017 and expected to vest thereafter | $	$ 297
Estimated fair value of the Company's common stock (in usd per share)	$ 8.20
2011 Stock Incentive Plan
Stock Options
Beginning balance stock options, outstanding (in shares) | shares	1,931,830
Stock options, granted (in shares) | shares	14,724
Stock options, exercised (in shares) | shares	(263,067)
Stock options, forfeited (in shares) | shares	(502,142)
Stock options, expired (in shares) | shares	(84,708)
Ending balance stock options, outstanding (in shares) | shares	1,096,637
Stock options, exercisable (in shares) | shares	642,775
Stock options, expected to vest after September 30, 2017 (in shares) | shares	453,862
Stock options, exercisable as of March 31, 2017 and expected to vest thereafter (in shares) | shares	1,096,637
Weighted- Average Exercise Price
Weighted - average exercise price, outstanding (in usd per share)	$ 8.73
Weighted - average exercise price, granted (in usd per share)	8.15
Weighted - average exercise price, exercised (in usd per share)	5.89
Weighted - average exercise price, forfeited (in usd per share)	10.11
Weighted - average exercise price, expired (in usd per share)	10.24
Weighted - average exercise price, outstanding (in usd per share)	8.64
Weighted - average exercise price exercisable at March 31, 2017 (in usd per share)	8.31
Weighted - average exercise price, expected to vest after March 31, 2017 (in usd per share)	9.12
Weighted - average exercise price, exercisable as of March 31, 2017 and expected to vest thereafter (in usd per share)	$ 8.64
Weighted - average remaining contractual term, outstanding	3 years 11 months 29 days
Weighted - average remaining contractual term, exercisable at March 31, 2017	3 years 2 months 17 days
Weighted - average remaining contractual term, expected to vest after March 31, 2017	5 years 1 month 7 days
Weighted - average remaining contractual term, exercisable as of March 31, 2017 and expected to vest thereafter	3 years 11 months 29 days
Aggregate intrinsic value, outstanding | $	$ 847
Aggregate intrinsic value, exercisable at March 31, 2017 | $	695
Aggregate intrinsic value, expected to vest after March 31, 2017 | $	153
Aggregate intrinsic value, exercisable as of March 31, 2017 and expected to vest thereafter | $	$ 847
Estimated fair value of the Company's common stock (in usd per share)	$ 8.20

Stock-Based Compensation - Su72

Stock-Based Compensation - Summary of Restricted Stock Awards and Restricted Stock Units (Detail) - $ / shares	Feb. 09, 2016	Sep. 30, 2017
Restricted Stock Awards | 2013 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in shares)		7,332,537
Granted (in shares)		160,428
Vested (in shares)		(1,969,623)
Canceled (in shares)		(200,934)
Non-vested, ending balance (in shares)		5,322,408
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 13.21
Weighted average grant date fair value, granted (in usd per share)		8.15
Weighted average grant date fair value, vested (in usd per share)		10.70
Weighted average grant date fair value, canceled (in usd per share)		11.89
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 14.03
Restricted Stock Units | 2011 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in shares)		1,473,655
Granted (in shares)	2,202,846	1,226,157
Vested (in shares)		(602,930)
Canceled (in shares)		(550,287)
Non-vested, ending balance (in shares)		1,546,595
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 9.25
Weighted average grant date fair value, granted (in usd per share)		7.98
Weighted average grant date fair value, vested (in usd per share)		7.64
Weighted average grant date fair value, canceled (in usd per share)		8.50
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 8.25
Restricted Stock Units | 2013 Stock Incentive Plan
Restricted Stock Units
Non-vested, beginning balance (in shares)		100,369
Granted (in shares)		3,827,439
Vested (in shares)		(553,774)
Canceled (in shares)		(265,070)
Non-vested, ending balance (in shares)		3,108,964
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share)		$ 12
Weighted average grant date fair value, granted (in usd per share)		7.92
Weighted average grant date fair value, vested (in usd per share)		7.93
Weighted average grant date fair value, canceled (in usd per share)		7.85
Weighted average grant date fair value, non-vested, ending balance (in usd per share)		$ 7.94

Accumulated Other Comprehensi73

Accumulated Other Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	$ 124,383
Other comprehensive income (loss)	2,675
Stockholders' equity attributable to parent, ending balance	61,703
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)	2,984
Stockholders' equity attributable to parent, ending balance	589
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)	(309)
Stockholders' equity attributable to parent, ending balance	(1,580)
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	$ (991)

Redeemable Non-Controlling In74

Redeemable Non-Controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 07, 2017	Aug. 14, 2016	Jul. 13, 2016	May 16, 2016	Jan. 06, 2016	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Jul. 14, 2016	Aug. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Reduced accretion value									$ 14,200
Accretion in excess of fair value							$ 0	$ 7,247
WZ (UK) Ltd.
Redeemable Noncontrolling Interest [Line Items]
Ownership interest				77.50%	57.50%					86.40%	49.00%
Ownership interest					57.50%
Cash paid for minority investments					$ 2,100
Redeemable non-controlling interest					10,800
Expected value upon exercise of put option					$ 30,000
Put option accretion period		24 months
Percentage of additional stake acquired				20.00%
Payments to acquire business	$ 25,000		$ 18,000	$ 15,400
Pseudio Limited
Redeemable Noncontrolling Interest [Line Items]
Ownership interest			100.00%
Cash paid for minority investments						$ 1,500
Resume Labs Limited
Redeemable Noncontrolling Interest [Line Items]
Cash paid for minority investments						$ 1,500

Redeemable Non-controlling In75

Redeemable Non-controlling Interest - Schedule of Change in Redeemable Non-controlling Interest (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning balance		$ 17,753
Accretion in excess of fair value	$ 0	7,247
Payment of redeemable non-controlling interest		(25,000)	$ (33,425)
Ending balance	$ 0	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 11, 2015	Nov. 20, 2014	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits that would impact effective tax rate			$ 1,100			$ 1,100	$ 0
Increase (decrease) in valuation allowance				$ (1,600)				$ (72,800)
Income tax expense (benefit)			2,982	(7,387)		11,384		(121,220)
Deferred federal and state deferred tax expense (benefit)			1,900	(9,100)		7,300		(49,700)
Federal and state current income taxes			200	(100)		2,600		1,400
Deferred foreign income tax expense (benefit)			(200)			(800)		(2,100)
Provision for foreign tax			$ 700	$ 300		$ 2,300		2,000
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income							142,700
Amount of net operating loss carry-forwards available to offset future state taxable income							125,600
Loss carry-forwards available to future foreign taxable income							$ 96,800
Net operating loss carry-forwards annual limitations									$ 77,100
Common stock, shares issued (in shares)			138,074,911			138,074,911	134,793,857
Constant Contact, Inc.
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance					$ (73,600)
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
Tax credit carryforward							20,300
Federal And State
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance			$ 10,400				10,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax assets, capital loss carryforwards							1,400
Tax credit carryforward							12,200
India
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							2,500
CHINA
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							300
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							10,700
United Kingdom
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							81,100
ISRAEL
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							1,900
SINGAPORE
Operating Loss Carryforwards [Line Items]
Loss carry-forwards available to future foreign taxable income							$ 300
Research Tax Credit Carryforward | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Increase (decrease) in valuation allowance								$ (7,300)

Severance and Other Exit Cost77

Severance and Other Exit Costs - Additional Information (Detail)	1 Months Ended	3 Months Ended	9 Months Ended
	Jan. 31, 2017position	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)position	Dec. 31, 2016USD ($)
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred			$ 12,887,000
Accrued reserve		$ 6,017,000	6,017,000	$ 1,559,000
Payments for restructuring			8,429,000
Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge			1,698,000
Accrued reserve		6,558,000	6,558,000	9,020,000
Payments for restructuring			$ 4,692,000
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position			265
Severance costs incurred		0	$ 0
2016 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		0	0
Payments for restructuring		200,000	1,600,000
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	660
Severance costs incurred		3,900,000	12,800,000
2017 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Accrued reserve		6,000,000	6,000,000
Payments for restructuring		3,000,000	6,800,000
2017 Restructuring Plan | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		300,000	900,000
Accrued reserve		600,000	600,000
Payments for restructuring		300,000	300,000
Constant Contact, Inc. | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	50
Email Marketing Unit | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred			4,083,000
Accrued reserve		1,110,000	1,110,000	926,000
Payments for restructuring			3,899,000
Email Marketing Unit | Facilities Closing
Restructuring Cost and Reserve [Line Items]
Facilities charge		300,000	783,000
Accrued reserve		5,811,000	5,811,000	$ 8,747,000
Payments for restructuring		$ 1,300,000	$ 3,719,000

Severance and Other Exit Cost78

Severance and Other Exit Costs - Summary of Aggregate Activity Related to Company's Facilities Exit Costs Accrual and Severance Accrual (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 9,020
Facility adjustments		1,698
Sublease income received		532
Cash paid		(4,692)
Ending Balance	$ 6,558	6,558
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		1,559
Severance charges		12,887
Cash paid		(8,429)
Ending Balance	6,017	6,017
Web presence segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		273
Facility adjustments		915
Sublease income received		532
Cash paid		(973)
Ending Balance	747	747
Web presence segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		633
Severance charges		8,804
Cash paid		(4,530)
Ending Balance	4,907	4,907
Email marketing segment | Facilities Closing
Restructuring Reserve [Roll Forward]
Beginning Balance		8,747
Facility adjustments	300	783
Sublease income received		0
Cash paid	(1,300)	(3,719)
Ending Balance	5,811	5,811
Email marketing segment | Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance		926
Severance charges		4,083
Cash paid		(3,899)
Ending Balance	$ 1,110	$ 1,110

Severance and Other Exit Cost79

Severance and Other Exit Costs - Summary of Total Restructuring Charges Recorded in the Consolidated Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 4,489	$ 6,377	$ 14,584	$ 23,642
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	449	3,127	3,892	8,729
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	1,011	1,189	3,260	6,357
Engineering and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	271	1,014	1,349	4,256
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 2,758	$ 1,047	$ 6,083	$ 4,300

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Oct. 16, 2017	Jul. 06, 2017patentclaim	Jun. 30, 2017USD ($)	Aug. 07, 2015defendant	Aug. 31, 2012defendantpatent	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)
Loss Contingencies [Line Items]
Minimum revenue requirement from single customer per year			$ 500
SEC investigations reserve						$ 8,000,000	$ 0	$ 8,000,000	$ 0
SEC
Loss Contingencies [Line Items]
SEC investigations reserve						$ 8,000,000
Constant Contact, Inc. | McGee vs Constant Contact
Loss Contingencies [Line Items]
Number of defendants | defendant				2
Constant Contact, Inc. | RPost Holdings
Loss Contingencies [Line Items]
Number of defendants | defendant					5
Number of pending claims | claim		1
Number of patents allegedly infringed | patent		1			5
Subsequent Event | Myers vs Constant Contact
Loss Contingencies [Line Items]
Plantiff decision period	30 days

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 09, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Prepaid expenses and other current assets		$ 29,170		$ 29,170		$ 28,678
Amount included in accounts receivable		$ 13,984		$ 13,984		13,088
Interest rate cap period	3 years
Former Chief Executive Officer
Related Party Transaction [Line Items]
Common stock outstanding ownership percentage		5.00%		5.00%
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense		$ 1,500		$ 1,500		1,300
Related party transaction expense		3,850	$ 3,550	11,100	$ 10,850
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense		1,200		1,200		1,100
Prepaid expenses and other current assets		100		100		200
Amount included in accounts receivable		700		700		$ 600
Related party transaction expense		$ 950	$ 1,050	$ 2,250	$ 4,200
Goldman, Sachs & Co.
Related Party Transaction [Line Items]
Related party transaction expense	$ 500
Interest rate cap period	3 years

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Revenue	$ (295,222)	$ (291,193)	$ (882,617)	$ (819,019)
Sales and marketing	66,276	75,341	211,154	234,944
Engineering and development	19,882	23,988	60,393	67,930
General and administrative	51,269	33,399	130,929	108,508
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Cost of revenue	3,100	3,000	9,100	9,400
Sales and marketing	500	150	1,000	350
Engineering and development	200	300	850	900
General and administrative	50	100	150	200
Total related party transaction expense, net	3,850	3,550	11,100	10,850
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Revenue	(1,050)	(900)	(2,150)	(2,200)
Revenue (contra)	1,850	1,800	4,050	5,900
Total related party transaction impact to revenue	800	900	1,900	3,700
Cost of revenue	150	150	350	500
Total related party transaction expense, net	$ 950	$ 1,050	$ 2,250	$ 4,200

Segment Information - Additiona

Segment Information - Additional Information (Details) - Segment	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Number of reportable segments	2	2	1

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jul. 27, 2016	Jul. 14, 2016	May 16, 2016	Jan. 06, 2016	Dec. 31, 2014	Aug. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 295,222	$ 291,193	$ 882,617	$ 819,019
Gross profit	136,357	141,766	428,420	380,039
Net loss	(40,264)	(29,798)	(107,257)	(49,147)
Interest expense, net	35,645	41,046	120,516	112,135
Income tax expense (benefit)	2,982	(7,387)	11,384	(121,220)
Depreciation	13,571	17,010	40,733	46,942
Amortization of other intangible assets	35,347	37,982	104,554	105,679
Stock-based compensation	19,580	14,806	48,749	48,218
Restructuring expenses	4,488	6,377	14,584	23,642
Transaction expenses and charges	0	159	773	32,257
SEC investigations reserve	8,000	0	8,000	0
Loss (gain) of unconsolidated entities	(33)	5,018	(72)	(5,368)
Impairment of other long-lived assets	14,448	0	14,448	8,285
Adjusted EBITDA	93,764	85,213	256,412	201,423
Total assets	2,651,099		2,651,099		$ 2,756,274
Gain (loss) on extinguishment of debt including debt issuance costs			(6,500)
Loss of unconsolidated entities	(33)	173	(72)	1,197
Web Presence Unit
Segment Reporting Information [Line Items]
Revenue	193,696	195,275	584,217	589,364
Gross profit	71,071	89,059	240,239	265,610
Net loss	(42,466)	(19,886)	(99,232)	2,787
Interest expense, net	15,131	18,244	52,304	53,337
Income tax expense (benefit)	1,659	(1,435)	16,203	(90,033)
Depreciation	10,338	9,173	30,101	27,248
Amortization of other intangible assets	16,577	19,729	48,857	59,252
Stock-based compensation	17,912	12,703	43,357	37,778
Restructuring expenses	3,806	541	9,842	1,501
Transaction expenses and charges	0	159	0	31,273
SEC investigations reserve	5,249	0		0
Loss (gain) of unconsolidated entities	(33)	5,018	(72)	(5,368)
Impairment of other long-lived assets	14,448	0	14,448	8,285
Adjusted EBITDA	42,621	44,246	121,057	126,060
Total assets	1,422,268		1,422,268		1,507,977
Email Marketing Unit
Segment Reporting Information [Line Items]
Revenue	101,526	95,918	298,400	229,655
Gross profit	65,286	52,707	188,181	114,429
Net loss	2,202	(9,912)	(8,025)	(51,934)
Interest expense, net	20,514	22,802	68,212	58,798
Income tax expense (benefit)	1,323	(5,952)	(4,819)	(31,187)
Depreciation	3,233	7,837	10,632	19,694
Amortization of other intangible assets	18,770	18,253	55,697	46,427
Stock-based compensation	1,668	2,103	5,392	10,440
Restructuring expenses	682	5,836	4,742	22,141
Transaction expenses and charges	0	0	773	984
SEC investigations reserve	2,751	0	2,751	0
Loss (gain) of unconsolidated entities	0	0	0	0
Impairment of other long-lived assets	0	0	0	0
Adjusted EBITDA	51,143	40,967	135,355	75,363
Total assets	1,228,831		1,228,831		$ 1,248,297
WZ (UK) Ltd.
Segment Reporting Information [Line Items]
Remeasurement gain (loss), net				11,400
Ownership interest							86.40%	77.50%	57.50%		49.00%
Webzai Limited
Segment Reporting Information [Line Items]
Impairment of other long-lived assets				4,900
Constant Contact, Inc.
Segment Reporting Information [Line Items]
Impairment of other long-lived assets		2,000		2,000
AppMachine
Segment Reporting Information [Line Items]
Remeasurement gain (loss), net		(4,800)
Ownership interest						100.00%				40.00%
Convertible Promissory Note
Segment Reporting Information [Line Items]
Other than temporary impairment losses on investments	600		600
Developed And In Process Technology | Webzai Limited
Segment Reporting Information [Line Items]
Impairment charge of intangible assets		$ 6,300		$ 6,300
Domain Name Intangible Assets
Segment Reporting Information [Line Items]
Impairment of other long-lived assets	$ 13,800		$ 13,800

Supplemental Guarantor Financ85

Supplemental Guarantor Financial Information - Additional Information (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2016USD ($)guarantor	Sep. 30, 2016USD ($)	Feb. 29, 2016USD ($)
Guarantor Obligations [Line Items]
Number of guarantors sold | guarantor	2
Proceeds from sale of assets		$ 0
Notes
Guarantor Obligations [Line Items]
Senior notes			$ 350,000,000
Interest rate, stated percentage			10.875%
CardStar | Guarantor Subsidiaries
Guarantor Obligations [Line Items]
Proceeds from sale of assets	$ 100,000

Supplemental Guarantor Financ86

Supplemental Guarantor Financial Information - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 70,521	$ 53,596	$ 63,148	$ 33,030
Restricted cash	2,647	3,302
Accounts receivable	13,984	13,088
Prepaid domain name registry fees	55,742	55,444
Prepaid expenses and other current assets	29,170	28,678
Total current assets	172,064	154,108
Intercompany receivables, net	0	0
Property and equipment—net	88,557	95,272
Goodwill	1,862,489	1,859,909
Other intangible assets—net	496,036	612,057
Investment in subsidiaries	0	0
Other assets	31,953	34,928
Total assets	2,651,099	2,756,274
Current liabilities:
Accounts payable	13,397	16,074
Accrued expenses and other current liabilities	93,724	97,858
Deferred revenue	368,613	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	3,166	6,690
Deferred consideration, short-term	4,319	5,273
Total current liabilities	517,164	516,785
Long-term deferred revenue	90,904	89,200
Notes payable	1,920,258	1,951,280
Capital lease obligations—long term	1,485	512
Deferred consideration	3,493	7,444
Other long-term liabilities	56,092	48,917
Total liabilities	2,589,396	2,614,138
Redeemable non-controlling interest	0	17,753
Equity	61,703	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,651,099	2,756,274
Reportable Legal Entities | Parent
Current assets:
Cash and cash equivalents	461	3	3	12
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	32	0
Total current assets	493	3
Intercompany receivables, net	32,723	31,665
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	28,476	92,068
Other assets	0	0
Total assets	61,692	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	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Redeemable non-controlling interest		0
Equity	61,692	123,736
Total liabilities, redeemable non-controlling interest and stockholders’ equity	61,692	123,736
Reportable Legal Entities | Issuer
Current assets:
Cash and cash equivalents	1	4	15	67
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	28	81
Total current assets	29	85
Intercompany receivables, net	680,824	799,953
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	1,311,664	1,299,562
Other assets	3,831	5,911
Total assets	1,996,348	2,105,511
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	14,596	27,208
Deferred revenue	0	0
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	48,541	62,908
Long-term deferred revenue	0	0
Notes payable	1,920,258	1,951,280
Capital lease obligations—long term	0	0
Deferred consideration	0	0
Other long-term liabilities	(927)	(745)
Total liabilities	1,967,872	2,013,443
Redeemable non-controlling interest		0
Equity	28,476	92,068
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,996,348	2,105,511
Reportable Legal Entities | Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	54,881	39,034	47,738	21,286
Restricted cash	2,472	2,620
Accounts receivable	10,817	10,148
Prepaid domain name registry fees	29,367	31,044
Prepaid expenses and other current assets	18,040	17,996
Total current assets	115,577	100,842
Intercompany receivables, net	(566,701)	(690,761)
Property and equipment—net	73,717	82,901
Goodwill	1,685,981	1,683,121
Other intangible assets—net	483,397	592,095
Investment in subsidiaries	43,652	40,651
Other assets	21,684	23,153
Total assets	1,857,307	1,832,002
Current liabilities:
Accounts payable	11,577	13,801
Accrued expenses and other current liabilities	68,949	60,760
Deferred revenue	315,534	295,208
Current portion of notes payable	0	0
Current portion of capital lease obligations	3,166	6,690
Deferred consideration, short-term	4,294	4,415
Total current liabilities	403,520	380,874
Long-term deferred revenue	81,155	77,649
Notes payable	0	0
Capital lease obligations—long term	1,485	512
Deferred consideration	3,493	7,419
Other long-term liabilities	56,367	48,233
Total liabilities	546,020	514,687
Redeemable non-controlling interest		17,753
Equity	1,311,287	1,299,562
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,857,307	1,832,002
Reportable Legal Entities | Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	15,178	14,555	15,392	11,665
Restricted cash	175	682
Accounts receivable	3,167	2,940
Prepaid domain name registry fees	26,390	24,697
Prepaid expenses and other current assets	11,070	10,601
Total current assets	55,980	53,475
Intercompany receivables, net	(146,846)	(140,857)
Property and equipment—net	14,840	12,371
Goodwill	176,508	176,788
Other intangible assets—net	12,261	19,962
Investment in subsidiaries	0	0
Other assets	6,438	5,864
Total assets	119,181	127,603
Current liabilities:
Accounts payable	1,820	2,273
Accrued expenses and other current liabilities	10,179	9,890
Deferred revenue	53,104	60,925
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	25	858
Total current liabilities	65,128	73,946
Long-term deferred revenue	9,749	11,551
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration	0	25
Other long-term liabilities	652	1,429
Total liabilities	75,529	86,951
Redeemable non-controlling interest		0
Equity	43,652	40,652
Total liabilities, redeemable non-controlling interest and stockholders’ equity	119,181	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	(15)	(297)
Prepaid expenses and other current assets	0	0
Total current assets	(15)	(297)
Intercompany receivables, net	0	0
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	378	0
Investment in subsidiaries	(1,383,792)	(1,432,281)
Other assets	0	0
Total assets	(1,383,429)	(1,432,578)
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	(25)	(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	(25)	(943)
Long-term deferred revenue	0	0
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration	0	0
Other long-term liabilities	0	0
Total liabilities	(25)	(943)
Redeemable non-controlling interest		0
Equity	(1,383,404)	(1,431,635)
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ (1,383,429)	$ (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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 295,222	$ 291,193	$ 882,617	$ 819,019
Cost of revenue	158,865	149,427	454,197	438,980
Gross profit	136,357	141,766	428,420	380,039
Operating expense:
Sales and marketing	66,276	75,341	211,154	234,944
Engineering and development	19,882	23,988	60,393	67,930
General and administrative	51,269	33,399	130,929	108,508
Transaction expenses	0	159	773	32,257
Total operating expense	137,427	132,887	403,249	443,639
Income (loss) from operations	(1,070)	8,879	25,171	(63,600)
Interest expense and other income, net	36,245	45,891	121,116	105,570
Loss before income taxes and equity earnings of unconsolidated entities	(37,315)	(37,012)	(95,945)	(169,170)
Income tax expense (benefit)	2,982	(7,387)	11,384	(121,220)
Loss before equity earnings of unconsolidated entities	(40,297)	(29,625)	(107,329)	(47,950)
Equity loss (income) of unconsolidated entities, net of tax	(33)	173	(72)	1,197
Net loss	(40,264)	(29,798)	(107,257)	(49,147)
Net loss attributable to non-controlling interest	0	1,939	7,524	(11,181)
Net loss attributable to Endurance International Group Holdings, Inc.	(40,264)	(31,737)	(114,781)	(37,966)
Comprehensive income (loss):
Foreign currency translation adjustment	1,070	112	2,984	994
Unrealized loss on derivative	83	72	(309)	(1,866)
Total comprehensive (loss) income	(39,111)	(31,553)	(112,106)	(38,838)
Eliminations
Income Statement [Abstract]
Revenue	(1,782)	(1,386)	(4,510)	(3,043)
Cost of revenue	(1,334)	(1,514)	(3,642)	(3,578)
Gross profit	(448)	128	(868)	535
Operating expense:
Sales and marketing	0	(10)	(3)	(26)
Engineering and development	0	0	0	0
General and administrative	(605)	0	(605)	0
Transaction expenses	0	0	0	0
Total operating expense	(605)	(10)	(608)	(26)
Income (loss) from operations	157	138	(260)	561
Interest expense and other income, net	0	0	0	0
Loss before income taxes and equity earnings of unconsolidated entities	157	138	(260)	561
Income tax expense (benefit)	0	0	0	0
Loss before equity earnings of unconsolidated entities	157	138	(260)	561
Equity loss (income) of unconsolidated entities, net of tax	(58,817)	(45,157)	(138,647)	(52,748)
Net loss	58,974	45,295	138,387	53,309
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	58,974	45,295	138,387	53,309
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive (loss) income	58,974	45,295	138,387	53,309
Parent Company | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0	0	0
Cost of revenue	0	0	0	0
Gross profit	0	0	0	0
Operating expense:
Sales and marketing	0	0	0	0
Engineering and development	0	0	0	0
General and administrative	0	0	0	0
Transaction expenses	0	0	0	0
Total operating expense	0	0	0	0
Income (loss) from operations	0	0	0	0
Interest expense and other income, net	0	0	0	0
Loss before income taxes and equity earnings of unconsolidated entities	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Loss before equity earnings of unconsolidated entities	0	0	0	0
Equity loss (income) of unconsolidated entities, net of tax	40,422	31,875	106,999	38,528
Net loss	(40,422)	(31,875)	(106,999)	(38,528)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	(40,422)	(31,875)	(106,999)	(38,528)
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive (loss) income	(40,422)	(31,875)	(106,999)	(38,528)
Issuer | Reportable Legal Entities
Income Statement [Abstract]
Revenue	0	0	0	0
Cost of revenue	0	0	0	0
Gross profit	0	0	0	0
Operating expense:
Sales and marketing	0	0	0	0
Engineering and development	0	0	0	0
General and administrative	56	67	166	187
Transaction expenses	0	0	0	0
Total operating expense	56	67	166	187
Income (loss) from operations	(56)	(67)	(166)	(187)
Interest expense and other income, net	35,661	40,206	120,313	109,547
Loss before income taxes and equity earnings of unconsolidated entities	(35,717)	(40,273)	(120,479)	(109,734)
Income tax expense (benefit)	(13,201)	(13,971)	(44,512)	(40,840)
Loss before equity earnings of unconsolidated entities	(22,516)	(26,302)	(75,967)	(68,894)
Equity loss (income) of unconsolidated entities, net of tax	17,906	5,573	31,033	(30,366)
Net loss	(40,422)	(31,875)	(107,000)	(38,528)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	(40,422)	(31,875)	(107,000)	(38,528)
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	83	72	(309)	(1,866)
Total comprehensive (loss) income	(40,339)	(31,803)	(107,309)	(40,394)
Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	266,985	258,366	788,806	720,149
Cost of revenue	139,044	127,750	392,447	374,010
Gross profit	127,941	130,616	396,359	346,139
Operating expense:
Sales and marketing	61,376	62,737	195,392	179,714
Engineering and development	17,412	21,802	51,053	55,583
General and administrative	50,353	29,640	123,736	97,694
Transaction expenses	0	159	773	32,257
Total operating expense	129,141	114,338	370,954	365,248
Income (loss) from operations	(1,200)	16,278	25,405	(19,109)
Interest expense and other income, net	756	5,738	1,150	(3,839)
Loss before income taxes and equity earnings of unconsolidated entities	(1,956)	10,540	24,255	(15,270)
Income tax expense (benefit)	15,494	6,401	54,744	(80,037)
Loss before equity earnings of unconsolidated entities	(17,450)	4,139	(30,489)	64,767
Equity loss (income) of unconsolidated entities, net of tax	456	7,772	543	45,581
Net loss	(17,906)	(3,633)	(31,032)	19,186
Net loss attributable to non-controlling interest	0	1,939	7,524	(11,181)
Net loss attributable to Endurance International Group Holdings, Inc.	(17,906)	(5,572)	(38,556)	30,367
Comprehensive income (loss):
Foreign currency translation adjustment	0	0	0	0
Unrealized loss on derivative	0	0	0	0
Total comprehensive (loss) income	(17,906)	(5,572)	(38,556)	30,367
Non-Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue	30,019	34,213	98,321	101,913
Cost of revenue	21,155	23,191	65,392	68,548
Gross profit	8,864	11,022	32,929	33,365
Operating expense:
Sales and marketing	4,900	12,614	15,765	55,256
Engineering and development	2,470	2,186	9,340	12,347
General and administrative	1,465	3,692	7,632	10,627
Transaction expenses	0	0	0	0
Total operating expense	8,835	18,492	32,737	78,230
Income (loss) from operations	29	(7,470)	192	(44,865)
Interest expense and other income, net	(172)	(53)	(347)	(138)
Loss before income taxes and equity earnings of unconsolidated entities	201	(7,417)	539	(44,727)
Income tax expense (benefit)	689	183	1,152	(343)
Loss before equity earnings of unconsolidated entities	(488)	(7,600)	(613)	(44,384)
Equity loss (income) of unconsolidated entities, net of tax	0	110	0	202
Net loss	(488)	(7,710)	(613)	(44,586)
Net loss attributable to non-controlling interest	0	0	0	0
Net loss attributable to Endurance International Group Holdings, Inc.	(488)	(7,710)	(613)	(44,586)
Comprehensive income (loss):
Foreign currency translation adjustment	1,070	112	2,984	994
Unrealized loss on derivative	0	0	0	0
Total comprehensive (loss) income	$ 582	$ (7,598)	$ 2,371	$ (43,592)

Supplemental Guarantor Financ88

Supplemental Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		$ 128,866	$ 101,804
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		0	(889,634)
Purchases of property and equipment		(32,095)	(29,317)
Cash paid for minority investments		0	(5,600)
Proceeds from sale of property and equipment		292	242
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		(1,966)	(27)
Net withdrawals of principal balances in restricted cash accounts		655	(738)
Net cash used in investing activities		(33,114)	(925,074)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver		1,693,007	1,105,678
Repayment of notes payable and revolver		(1,733,147)	(125,775)
Payment of financing costs		(6,304)	(52,561)
Payment of deferred consideration		(5,408)	(43,080)
Payment of redeemable non-controlling interest liability		(25,000)	(33,425)
Principal payments on capital lease obligations		(5,679)	(4,372)
Proceeds from exercise of stock options		1,548	2,304
Capital investments from minority partner			2,776
Intercompany loans and investments		0	0
Net cash provided by (used in) financing activities		(80,983)	851,545
Net effect of exchange rate on cash and cash equivalents		2,156	1,843
Net increase in cash and cash equivalents		16,925	30,118
Cash and cash equivalents:
Beginning of period	$ 63,148	53,596	33,030
End of period	53,596	70,521	63,148
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		0	0
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired			0
Purchases of property and equipment		0	0
Cash paid for minority investments			0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		0	0
Net 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
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	0
End of period	0	0	0
Parent Company | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		(32)	0
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired			0
Purchases of property and equipment		0	0
Cash paid for minority investments			0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		0	0
Net withdrawals of principal balances in restricted cash accounts		0	0
Net cash used in investing activities		0	0
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver		0	0
Repayment of notes payable and revolver		0	0
Payment of financing costs		0	0
Payment of deferred consideration		0	0
Payment of redeemable non-controlling interest liability		0	0
Principal payments on capital lease obligations		0	0
Proceeds from exercise of stock options		1,548	2,304
Capital investments from minority partner			0
Intercompany loans and investments		(1,058)	(2,313)
Net cash provided by (used in) financing activities		490	(9)
Net effect of exchange rate on cash and cash equivalents		0	0
Net increase in cash and cash equivalents		458	(9)
Cash and cash equivalents:
Beginning of period	3	3	12
End of period	3	461	3
Issuer | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		(72,687)	(54,904)
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired			0
Purchases of property and equipment		0	0
Cash paid for minority investments			0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		0	0
Net withdrawals of principal balances in restricted cash accounts		0	0
Net cash used in investing activities		0	0
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver		1,693,007	1,105,678
Repayment of notes payable and revolver		(1,733,147)	(125,775)
Payment of financing costs		(6,304)	(52,561)
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
Intercompany loans and investments		119,128	(872,490)
Net cash provided by (used in) financing activities		72,684	54,852
Net effect of exchange rate on cash and cash equivalents		0	0
Net increase in cash and cash equivalents		(3)	(52)
Cash and cash equivalents:
Beginning of period	15	4	67
End of period	4	1	15
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		204,768	187,068
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired			(889,634)
Purchases of property and equipment		(28,140)	(25,362)
Cash paid for minority investments			(5,600)
Proceeds from sale of property and equipment		292	240
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		(1,932)	(10)
Net withdrawals of principal balances in restricted cash accounts		148	(347)
Net cash used in investing activities		(29,632)	(920,713)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver		0	0
Repayment of notes payable and revolver		0	0
Payment of financing costs		0	0
Payment of deferred consideration		(4,550)	(42,411)
Payment of redeemable non-controlling interest liability		(25,000)	(33,425)
Principal payments on capital lease obligations		(5,679)	(4,372)
Proceeds from exercise of stock options		0	0
Capital investments from minority partner			0
Intercompany loans and investments		(124,060)	840,305
Net cash provided by (used in) financing activities		(159,289)	760,097
Net effect of exchange rate on cash and cash equivalents		0	0
Net increase in cash and cash equivalents		15,847	26,452
Cash and cash equivalents:
Beginning of period	47,738	39,034	21,286
End of period	39,034	54,881	47,738
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities		(3,183)	(30,360)
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired			0
Purchases of property and equipment		(3,955)	(3,955)
Cash paid for minority investments			0
Proceeds from sale of property and equipment		0	2
Proceeds from note receivable			0
Proceeds from sale of assets			0
Purchases of intangible assets		(34)	(17)
Net withdrawals of principal balances in restricted cash accounts		507	(391)
Net cash used in investing activities		(3,482)	(4,361)
Cash flows from financing activities:
Proceeds from issuance of notes payable and draws on revolver		0	0
Repayment of notes payable and revolver		0	0
Payment of financing costs		0	0
Payment of deferred consideration		(858)	(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			2,776
Intercompany loans and investments		5,990	34,498
Net cash provided by (used in) financing activities		5,132	36,605
Net effect of exchange rate on cash and cash equivalents		2,156	1,843
Net increase in cash and cash equivalents		623	3,727
Cash and cash equivalents:
Beginning of period	15,392	14,555	11,665
End of period	$ 14,555	$ 15,178	$ 15,392