Alliancebernstein 10-Q 27 Jul 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2017shares
Document and Entity Information [Abstract]
Entity Registrant Name	ALLIANCEBERNSTEIN L.P.
Entity Central Index Key	1,109,448
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding	265,714,086

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 598,391	$ 656,985
Cash and securities segregated, at fair value (cost: $1,077,646 and $946,093)	1,077,649	946,097
Receivables, net:
Brokers and dealers	368,527	335,686
Brokerage clients	1,589,856	1,513,656
AB mutual funds fees	172,891	165,997
Other fees	99,233	104,376
Investments:
Long-term incentive compensation-related	62,585	67,761
Other	417,396	373,344
Cash and cash equivalents	963,168	994,510
Other assets	266,286	195,615
Furniture, equipment and leasehold improvements, net	152,158	159,564
Goodwill	3,066,700	3,066,700
Intangible assets, net	120,589	134,606
Deferred sales commissions, net	44,581	63,890
Total assets	9,067,912	8,740,448
Payables:
Brokers and dealers	257,676	239,578
Securities sold not yet purchased	22,552	40,944
Brokerage clients	2,444,583	2,360,481
AB mutual funds	193,520	150,939
Accounts payable and accrued expenses	490,478	430,569
Accrued compensation and benefits	453,544	251,019
Debt	512,437	512,970
Liabilities	4,800,837	4,279,300
Commitments and contingencies (See Note 12)
Redeemable non-controlling interest	344,104	392,959
Capital:
General Partner	39,683	41,100
Limited partners: 265,714,086 and 268,893,534 units issued and outstanding	4,014,259	4,154,810
Receivables from affiliates	(12,604)	(12,830)
AB Holding Units held for long-term incentive compensation plans	(52,999)	(32,967)
Accumulated other comprehensive loss	(102,225)	(118,096)
Partners’ capital attributable to AB Unitholders	3,886,114	4,032,017
Non-redeemable non-controlling interests in consolidated entities	36,857	36,172
Total capital	3,922,971	4,068,189
Total liabilities, redeemable non-controlling interest and capital	9,067,912	8,740,448
Company-sponsored investment funds
Investments:
Cash and cash equivalents	364,777	337,525
Investments	659,336	574,076
Other assets	6,957	44,570
Payables:
Liabilities	426,047	292,800
Redeemable non-controlling interest	335,440	384,294
Capital:
Non-redeemable non-controlling interests in consolidated entities	$ 36,168	$ 34,622

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Cash and securities segregated, at cost	$ 1,077,646	$ 946,093
Limited partners, units issued	265,714,086	268,893,534
Limited partners, units outstanding	265,714,086	268,893,534

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Investment advisory and services fees	$ 531,163	$ 477,050	$ 1,029,453	$ 928,463
Bernstein research services	109,470	115,053	222,211	241,518
Distribution revenues	100,149	97,321	196,703	190,013
Dividend and interest income	19,348	10,147	33,404	20,220
Investment gains (losses)	24,113	2,276	49,314	67,863
Other revenues	24,265	25,833	46,630	50,804
Total revenues	808,508	727,680	1,577,715	1,498,881
Less: Interest expense	6,195	1,874	10,485	3,949
Net revenues	802,313	725,806	1,567,230	1,494,932
Expenses:
Employee compensation and benefits	327,862	309,249	649,610	611,260
Promotion and servicing:
Distribution-related payments	102,756	93,217	199,123	180,344
Amortization of deferred sales commissions	8,307	10,577	17,386	21,819
Trade execution, marketing, T&E and other	53,235	55,357	101,449	109,558
General and administrative:
General and administrative	117,462	109,757	231,683	215,680
Real estate charges (credits)	20,747	(2,801)	20,745	24,785
Contingent payment arrangements	178	353	355	706
Interest on borrowings	2,254	1,052	4,122	2,284
Amortization of intangible assets	6,975	6,470	13,908	12,879
Total expenses	639,776	583,231	1,238,381	1,179,315
Operating income	162,537	142,575	328,849	315,617
Income taxes	10,265	13,231	20,322	25,737
Net income	152,272	129,344	308,527	289,880
Net income (loss) of consolidated entities attributable to non-controlling interests	17,169	4,843	33,487	(905)
Net income attributable to AB Unitholders	$ 135,103	$ 124,501	$ 275,040	$ 290,785
Net income per AB Unit:
Basic (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06
Diluted (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 152,272	$ 129,344	$ 308,527	$ 289,880
Other comprehensive income (loss):
Foreign currency translation adjustments, before tax	7,355	(5,123)	16,356	102
Income tax benefit	134	0	0	0
Foreign currency translation adjustments, net of tax	7,489	(5,123)	16,356	102
Unrealized gains (losses) on investments:
Unrealized gains (losses) arising during period	26	(11)	10	(19)
Less: reclassification adjustment for (losses) included in net income	0	0	0	(3)
Change in unrealized gains (losses) on investments	26	(11)	10	(16)
Income tax benefit (expense)	0	4	(2)	3
Unrealized gains (losses) on investments, net of tax	26	(7)	8	(13)
Changes in employee benefit related items:
Amortization of prior service cost	6	10	12	81
Recognized actuarial loss (gain)	264	391	523	(42)
Changes in employee benefit related items	270	401	535	39
Income tax expense	(3)	(4)	(79)	(75)
Employee benefit related items, net of tax	267	397	456	(36)
Other comprehensive income (loss)	7,782	(4,733)	16,820	53
Less: Comprehensive income (loss) in consolidated entities attributable to non-controlling interests	18,042	4,787	34,436	(910)
Comprehensive income attributable to AB Unitholders	$ 142,012	$ 119,824	$ 290,911	$ 290,843

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 308,527	$ 289,880
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred sales commissions	17,386	21,819
Non-cash long-term incentive compensation expense	21,337	4,383
Depreciation and other amortization	33,313	29,548
Unrealized (gains) losses on investments	2,636	(17,517)
Other, net	5,712	9,091
Changes in assets and liabilities:
(Increase) in segregated cash and securities	(131,552)	(100,895)
(Increase) in receivables	(50,545)	(382,084)
Decrease (increase) in investments	(37,978)	147,317
Decrease (increase) in deferred sales commissions	1,923	(1,837)
(Increase) decrease in other assets	(68,430)	(62,693)
Increase in payables	70,082	336,812
(Decrease) increase in accounts payable and accrued expenses	(11,189)	73,092
Increase in accrued compensation and benefits	201,417	176,636
Net cash provided by operating activities	448,239	514,578
Cash flows from investing activities:
Purchases of investments	(11)	0
Proceeds from sales of investments	10	92
Purchases of furniture, equipment and leasehold improvements	(14,023)	(20,304)
Proceeds from sales of furniture, equipment and leasehold improvements	39	0
Net cash used in investing activities	(13,985)	(20,212)
Cash flows from financing activities:
(Repayment) of commercial paper, net	(33,709)	(46,144)
Proceeds from bank loans	30,000	50,000
Increase in overdrafts payable	68,504	47,630
Distributions to General Partner and Unitholders	(339,139)	(275,930)
Capital contributions to non-controlling interests in consolidated entities	(7,869)	0
Purchase of non-controlling interest	(1,833)	0
Capital contributions to affiliates	(280)	(120)
Payments of contingent payment arrangements	(812)	(538)
Additional investments by AB Holding with proceeds from exercise of compensatory options to buy AB Holding Units	9,246	2,377
Purchases of AB Holding Units to fund long-term incentive compensation plan awards, net	(127,472)	(83,744)
Purchases of AB Units	(684)	(337)
Other	5	(11)
Net cash used in financing activities	(476,775)	(352,351)
Effect of exchange rate changes on cash and cash equivalents	11,179	6,324
Net (decrease) increase in cash and cash equivalents	(31,342)	148,339
Cash and cash equivalents as of beginning of the period	994,510	577,300
Cash and cash equivalents as of end of the period	963,168	725,639
Company-sponsored investment funds
Adjustments to reconcile net income to net cash provided by operating activities:
Unrealized (gains) losses on investments	(18,550)	2,599
Changes in assets and liabilities:
Decrease (increase) in investments	(66,710)	(10,630)
(Increase) decrease in other assets	170,860	(943)
Cash flows from financing activities:
Redemptions of non-controlling interests of consolidated company-sponsored investment funds, net	(72,732)	$ (45,534)
Cash and cash equivalents as of beginning of the period	337,525
Cash and cash equivalents as of end of the period	$ 364,777

Business Description Organizati

Business Description Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description Organization and Basis of Presentation	Business Description Organization and Basis of Presentation Business Description We provide research, diversified investment management and related services globally to a broad range of clients. Our principal services include: • Institutional Services – servicing our institutional clients, including private and public pension plans, foundations and endowments, insurance companies, central banks and governments worldwide, and affiliates such as AXA S.A. ("AXA")and its subsidiaries, by means of separately-managed accounts, sub-advisory relationships, structured products, collective investment trusts, mutual funds, hedge funds and other investment vehicles. • Retail Services – servicing our retail clients, primarily by means of retail mutual funds sponsored by AB or an affiliated company, sub-advisory relationships with mutual funds sponsored by third parties, separately-managed account programs sponsored by financial intermediaries worldwide and other investment vehicles. • Private Wealth Management Services – servicing our private clients, including high-net-worth individuals and families, trusts and estates, charitable foundations, partnerships, private and family corporations, and other entities, by means of separately-managed accounts, hedge funds, mutual funds and other investment vehicles. • Bernstein Research Services – servicing institutional investors, such as pension fund, hedge fund and mutual fund managers, seeking high-quality fundamental research, quantitative services and brokerage-related services in equities and listed options. We also provide distribution, shareholder servicing, transfer agency services and administrative services to the mutual funds we sponsor. Our high-quality, in-depth research is the foundation of our business. Our research disciplines include economic, fundamental equity, fixed income and quantitative research. In addition, we have experts focused on multi-asset strategies, wealth management and alternative investments. We provide a broad range of investment services with expertise in: • Actively-managed equity strategies, with global and regional portfolios across capitalization ranges and investment strategies, including value, growth and core equities; • Actively-managed traditional and unconstrained fixed income strategies, including taxable and tax-exempt strategies; • Passive management, including index and enhanced index strategies; • Alternative investments, including hedge funds, fund of funds and private equity ( e.g. , direct real estate investing and direct lending); and • Multi-asset solutions and services, including dynamic asset allocation, customized target-date funds and target-risk funds. Our services span various investment disciplines, including market capitalization ( e.g. , large-, mid- and small-cap equities), term ( e.g. , long-, intermediate- and short-duration debt securities), and geographic location ( e.g. , U.S., international, global, emerging markets, regional and local), in major markets around the world. Organization As of June 30, 2017 , AXA, a société anonyme organized under the laws of France and the holding company for the AXA Group, a worldwide leader in financial protection, through certain of its subsidiaries (“AXA and its subsidiaries”), owns approximately 1.5% of the issued and outstanding units representing assignments of beneficial ownership of limited partnership interests in AllianceBernstein Holding L.P. (“AB Holding Units”). AllianceBernstein Corporation (an indirect wholly-owned subsidiary of AXA, “General Partner”) is the general partner of both AllianceBernstein Holding L.P. (“AB Holding”) and AB. AllianceBernstein Corporation owns 100,000 general partnership units in AB Holding and a 1% general partnership interest in AB. As of June 30, 2017 , the ownership structure of AB, including limited partnership units outstanding as well as the general partner's 1% interest, is as follows: AXA and its subsidiaries 64.0 % AB Holding 34.8 Unaffiliated holders 1.2 100.0 % Including both the general partnership and limited partnership interests in AB Holding and AB, AXA and its subsidiaries had an approximate 64.6% economic interest in AB as of June 30, 2017 . Basis of Presentation The interim condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the interim results, have been made. The preparation of the condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the interim reporting periods. Actual results could differ from those estimates. The condensed consolidated statement of financial condition as of December 31, 2016 was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). Principles of Consolidation The condensed consolidated financial statements include AB and its majority-owned and/or controlled subsidiaries, and the consolidated entities that are considered to be variable interest entities ("VIEs") and voting interest entities ("VOEs") and for which AB has a controlling financial interest. Non-controlling interests on the condensed consolidated statements of financial condition includes the portion of consolidated company-sponsored investment funds in which we do not have direct equity ownership. All significant inter-company transactions and balances among the consolidated entities have been eliminated. Reclassifications During 2017, prior period amounts for our VOEs' investments previously presented as other investments are now presented as investments of consolidated company-sponsored investment funds in the condensed consolidated statements of financial condition to conform to the current period's presentation. Additionally, prior period amounts for dividend and interest related to our consolidated company-sponsored investment funds previously presented as other revenues are now presented as dividend and interest income in the condensed consolidated statements of income to conform to the current period's presentation. Lastly, all disclosures relating to the investments, derivatives and fair value of consolidated company-sponsored investment funds previously presented in Notes 8, 9, 10 and 11 are now separately disclosed in Note 13, Consolidated Company-Sponsored Investment Funds . Revision During the third quarter of 2016, management determined that the frequency with which we had settled our U.S. inter-company payable balances with foreign subsidiaries over the past several years created deemed dividends under Section 956 of the U.S. Internal Revenue Code of 1986, as amended ("Section 956"). In the past, we funded our foreign subsidiaries as they required cash for their operations rather than pre-fund them each quarter, thereby reducing the inter-company balance to zero on a quarterly basis, as required by Section 956. As a result, we had been understating our income tax provision and income tax liability since 2010. We evaluated the aggregate effects of this error in our income tax provision and income tax liability to our previously issued financial statements in accordance with SEC Staff Accounting Bulletins No. 99 and No. 108 and, based upon quantitative and qualitative factors, have determined that the error was not material to our previously issued financial statements. However, the cumulative effect of this error would have been material to our third quarter 2016 financial results if recorded as an out-of-period adjustment in the third quarter of 2016. Accordingly, we revised our previously issued financial statements from 2012 through the second quarter of 2016. We revised our income tax provision, net income attributable to AB Unitholders, and basic and diluted net income per AB Unit reported in prior periods in the statements of income. The table below reflects the revisions to these line items for the three and six months ended June 30, 2016 that are included in this Form 10-Q: Three Months Ended June 30, 2016 As Reported Adjustment As Revised (in thousands, except per unit amounts) Income taxes $ 10,588 $ 2,643 $ 13,231 Net income attributable to AB Unitholders 127,144 (2,643 ) 124,501 Basic net income per AB Unit 0.47 (0.01 ) 0.46 Diluted net income per AB Unit 0.47 (0.01 ) 0.46 Six Months Ended June 30, 2016 As Reported Adjustment As Revised (in thousands, except per unit amounts) Income taxes $ 20,452 $ 5,285 $ 25,737 Net income attributable to AB Unitholders 296,070 (5,285 ) 290,785 Basic net income per AB Unit 1.08 (0.02 ) 1.06 Diluted net income per AB Unit 1.08 (0.02 ) 1.06

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Changes and Error Corrections [Abstract]
Significant Accounting Policies	Significant Accounting Policies Recently Adopted Accounting Pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU') 2016-07, Investments - Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . The amendment eliminates the current requirement for a retroactive adjustment and instead requires that the investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Additionally, the amendment requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. We adopted this standard on January 1, 2017. The adoption of this standard did not have a material impact on our financial condition or results of operations. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting . The amendment includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements, including income tax effects of share-based payments, minimum statutory tax withholding requirements and forfeitures. We adopted this standard on January 1, 2017 on a prospective basis. The adoption of this standard did not have a material impact on our financial condition or results of operations. Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . The amendment is effective retrospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. Management currently is evaluating the impact that the adoption of this standard will have on our consolidated financial statements. We have not yet completed this analysis, but based on the analysis completed to date management does not expect the standard to have a material impact on our financial condition or results of operations. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities . The amendment addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments and is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017. The amendment will result in a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, except for one provision relating to equity securities without readily determinable fair values, which provision will be applied prospectively. The amendment is not expected to have a material impact on our financial condition or results of operations. In February 2016, the FASB issued ASU 2016-02, Leases . The amendment requires recognition of lease assets and lease liabilities on the statement of financial condition and disclosure of key information about leasing arrangements. Specifically, this guidance requires an operating lease lessee to recognize on the statement of financial condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. However, for leases with a term of twelve months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2018 and requires lessees to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach. Management currently is evaluating the impact that the adoption of this standard will have on our consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) . The amendment is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017 and should be applied using a retrospective transition method. The amendment is not expected to have a material impact on our financial condition or results of operations. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment . The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance will be applied prospectively, and is effective in 2020. The revised guidance is not expected to have a material impact on our financial condition or results of operations. In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . The amendment requires that an employer disaggregate the service cost component from the other components of net benefit costs on the income statement. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017 and should be applied retrospectively. The amendment is not expected to have a material impact on our results of operations. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation, Scope of Modification Accounting . The amendment provides clarity and reduces both diversity in practice and cost and complexity when applying the guidance in Topic 718, Compensation - Stock Compensation, to a change to the terms or conditions of a share-based payment award. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 and will be applied prospectively to an award modified on or after the adoption date. This amendment is not expected to have a material impact on our results of operations. Consolidation of company-sponsored investment funds We adopted ASU 2015-02, Consolidation - Amendments to the Consolidation Analysis ( "ASU 2015-02") effective January 1, 2016. For legal entities (company-sponsored investment funds) evaluated for consolidation, we first determine whether the fees we receive and the interests we hold qualify as a variable interest in the entity, including an evaluation of fees paid to us as a decision maker or service provider to the entity being evaluated. Fees received by us are not variable interests if (i) the fees are compensation for services provided and are commensurate with the level of effort required to provide those services, (ii) the service arrangement includes only terms, conditions or amounts that are customarily present in arrangements for similar services negotiated at arm’s length, and (iii) our other economic interests in the entity held directly and indirectly through our related parties, as well as economic interests held by related parties under common control, would not absorb more than an insignificant amount of the entity’s losses or receive more than an insignificant amount of the entity’s benefits. For those entities in which we have a variable interest, we perform an analysis to determine whether the entity is a VIE by considering whether the entity’s equity investment at risk is insufficient, whether the investors lack decision making rights proportional to their ownership percentage of the entity, and whether the investors lack the obligation to absorb an entity’s expected losses or the right to receive an entity’s expected income. A VIE must be consolidated by its primary beneficiary, which generally is defined as the party that has a controlling financial interest in the VIE. We are deemed to have a controlling financial interest in a VIE if we have (i) the power to direct the activities of the VIE that most significantly affect the VIE's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive income from the VIE that could potentially be significant to the VIE. For purposes of evaluating (ii) above, fees paid to us as a decision maker or service provider are excluded if the fees are compensation for services provided commensurate with the level of effort required to be performed and the arrangement includes only customary terms, conditions or amounts present in arrangements for similar services negotiated at arm’s length. The primary beneficiary evaluation generally is performed qualitatively based on all facts and circumstances, as well as quantitatively, as appropriate. If we have a variable interest in an entity that is determined not to be a VIE, the entity is then evaluated for consolidation under the VOE model. For limited partnerships and similar entities, we are deemed to have a controlling financial interest in a VOE, and would be required to consolidate the entity, if we own a majority of the entity’s kick-out rights through voting limited partnership interests and limited partners do not hold substantive participating rights (or other rights that would indicate that we do not control the entity). For entities other than limited partnerships, we are deemed to have a controlling financial interest in a VOE if we own a majority voting interest in the entity. The analysis performed regarding the determination of variable interests held, whether entities are VIEs or VOEs, and whether we have a controlling financial interest in such entities requires the exercise of judgment. The analysis is updated continuously as circumstances change or new entities are formed.

Long-term Incentive Compensatio

Long-term Incentive Compensation Plans	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Long-term Incentive Compensation Plans	Long-term Incentive Compensation Plans We maintain several unfunded, non-qualified long-term incentive compensation plans, under which we grant annual awards to employees, generally in the fourth quarter, and to members of the Board of Directors of the General Partner, who are not employed by our company or by any of our affiliates ("Eligible Directors"). We fund our restricted AB Holding Unit awards either by purchasing AB Holding Units on the open market or purchasing newly-issued AB Holding Units from AB Holding, and then keeping all of these AB Holding Units in a consolidated rabbi trust until delivering them or retiring them. In accordance with the Amended and Restated Agreement of Limited Partnership of AB (“AB Partnership Agreement”), when AB purchases newly-issued AB Holding Units from AB Holding, AB Holding is required to use the proceeds it receives from AB to purchase the equivalent number of newly-issued AB Units, thus increasing its percentage ownership interest in AB. AB Holding Units held in the consolidated rabbi trust are corporate assets in the name of the trust and are available to the general creditors of AB. During the three and six months ended June 30, 2017 , we purchased 4.3 million and 5.7 million AB Holding Units for $96.7 million and $127.8 million , respectively (on a trade date basis). These amounts reflect open-market purchases of 3.7 million and 4.9 million AB Holding Units for $82.4 million and $110.3 million , respectively, with the remainder relating to purchases of AB Holding Units from employees to allow them to fulfill statutory tax withholding requirements at the time of delivery of long-term incentive compensation awards. During the three and six months ended June 30, 2016 , we purchased 1.9 million and 3.8 million AB Holding units for $44.3 million and $84.0 million , respectively (on a trade date basis). These amounts reflect open-market purchases of 1.9 million and 3.7 million AB Holding Units for $43.9 million and $82.0 million , respectively, with the remainder relating to purchases of AB Holding Units from employees to allow them to fulfill statutory tax withholding requirements at the time of delivery of long-term incentive compensation awards. Purchases of AB Holding Units reflected on the condensed consolidated statements of cash flows are net of AB Holding Unit purchases by employees as part of a distribution reinvestment election. Each quarter, we consider whether to implement a plan to repurchase AB Holding Units pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (“Exchange Act”). A Rule 10b5-1 plan allows a company to repurchase its shares at times when it otherwise might be prevented from doing so because of self-imposed trading blackout periods or because it possesses material non-public information. Each broker we select has the authority under the terms and limitations specified in the plan to repurchase AB Holding Units on our behalf in accordance with the terms of the plan. Repurchases are subject to regulations promulgated by the SEC as well as certain price, market volume and timing constraints specified in the plan. The plan adopted during the second quarter of 2017 expired at the close of business on July 26, 2017. We may adopt additional Rule 10b5-1 plans in the future to engage in open-market purchases of AB Holding Units to help fund anticipated obligations under our incentive compensation award program and for other corporate purposes. During the first six months of 2017 and 2016 , we granted to employees and Eligible Directors 2.0 million and 0.3 million restricted AB Holding Unit awards, respectively. We used AB Holding Units repurchased during the period and newly-issued AB Holding Units to fund these awards. During the first six months of 2017 and 2016 , AB Holding issued 0.5 million and 0.1 million AB Holding Units, respectively, upon exercise of options to buy AB Holding Units. AB Holding used the proceeds of $9.2 million and $2.4 million , respectively, received as payment in cash for the exercise price to purchase the equivalent number of newly-issued AB Units.

Cash Distributions

Cash Distributions	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Cash Distributions	Cash Distributions AB is required to distribute all of its Available Cash Flow, as defined in the AB Partnership Agreement, to its Unitholders and to the General Partner. Available Cash Flow can be summarized as the cash flow received by AB from operations minus such amounts as the General Partner determines, in its sole discretion, should be retained by AB for use in its business, or plus such amounts as the General Partner determines, in its sole discretion, should be released from previously retained cash flow. Typically, Available Cash Flow has been the adjusted diluted net income per unit for the quarter multiplied by the number of general and limited partnership interests at the end of the quarter. In future periods, management anticipates that Available Cash Flow will be based on adjusted diluted net income per unit, unless management determines, with the concurrence of the Board of Directors, that one or more adjustments that are made for adjusted net income should not be made with respect to the Available Cash Flow calculation. On July 27, 2017 , the General Partner declared a distribution of $0.56 per AB Unit, representing a distribution of Available Cash Flow for the three months ended June 30, 2017 . The General Partner, as a result of its 1% general partnership interest, is entitled to receive 1% of each distribution. The distribution is payable on August 24, 2017 to holders of record on August 7, 2017 .

Real Estate Charges

Real Estate Charges	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Real Estate Charges	Real Estate Charges Since 2010, in connection with our workforce reductions and in an effort to reduce our global real estate footprint, we have implemented a global office space consolidation. As a result, we have sub-leased over one million square feet of office space. The activity in the liability account relating to our global space consolidation initiatives for the following periods is: Six Months Ended Twelve Months Ended (in thousands) Balance as of beginning of period $ 112,932 $ 123,912 Expense (credit) incurred 15,940 12,248 Deferred rent 3,601 4,930 Payments made (20,861 ) (32,988 ) Interest accretion 2,074 4,830 Balance as of end of period $ 113,686 $ 112,932

Net Income per Unit

Net Income per Unit	6 Months Ended
	Jun. 30, 2017
Earnings Per Unit [Abstract]
Net Income per Unit	Net Income per Unit Basic net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the total of the diluted weighted average number of units outstanding for each period. Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands, except per unit amounts) Net income attributable to AB Unitholders $ 135,103 $ 124,501 $ 275,040 $ 290,785 Weighted average units outstanding – basic 268,302 269,720 268,391 270,787 Dilutive effect of compensatory options to buy AB Holding Units 430 650 482 534 Weighted average units outstanding – diluted 268,732 270,370 268,873 271,321 Basic net income per AB Unit $ 0.50 $ 0.46 $ 1.01 $ 1.06 Diluted net income per AB Unit $ 0.50 $ 0.46 $ 1.01 $ 1.06 For the three and six months ended June 30, 2017 , we excluded 2,507,179 and 2,452,633 options, respectively, from the diluted net income computation due to their anti-dilutive effect. For the three and six months ended June 30, 2016 , we excluded 2,793,454 and 2,873,106 options, respectively, from the diluted net income computation due to their anti-dilutive effect.

Cash and Securities Segregated

Cash and Securities Segregated Under Federal Regulations and Other Requirements	6 Months Ended
	Jun. 30, 2017
Brokers and Dealers [Abstract]
Cash and Securities Segregated Under Federal Regulations and Other Requirements	Cash and Securities Segregated Under Federal Regulations and Other Requirements As of June 30, 2017 and December 31, 2016 , $1.0 billion and $0.9 billion , respectively, of U.S. Treasury Bills were segregated in a special reserve bank custody account for the exclusive benefit of our brokerage customers under Rule 15c3-3 of the Exchange Act. One of our subsidiaries, which serves as the distributor of our U.S. mutual funds, maintains several special bank accounts for the exclusive benefit of customers. As of June 30, 2017 and December 31, 2016 , $70.6 million and $52.9 million , respectively, of cash was segregated in these bank accounts.

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Investments consist of: June 30, December 31, (in thousands) Trading: U.S. Treasury Bills $ 27,764 $ 28,937 Long-term incentive compensation-related 49,189 50,935 Seed capital 166,739 188,053 Equities 82,381 6,602 Exchange-traded options 8,348 3,106 Investments in limited partnership hedge funds: Long-term incentive compensation-related 13,396 16,826 Seed capital 25,283 23,704 Private equity (seed capital) 44,852 45,278 Time deposits 50,429 70,097 Other 11,600 7,567 Total investments $ 479,981 $ 441,105 Total investments related to long-term incentive compensation obligations of $62.6 million and $67.8 million as of June 30, 2017 and December 31, 2016 , respectively, consist of company-sponsored mutual funds and hedge funds. For long-term incentive compensation awards granted before 2009, we typically made investments in our services that were notionally elected by plan participants and maintained them (and continue to maintain them) in a consolidated rabbi trust or separate custodial account. The rabbi trust and custodial account enable us to hold such investments separate from our other assets for the purpose of settling our obligations to participants. The investments held in the rabbi trust and custodial account remain available to the general creditors of AB. The underlying investments of the hedge funds in which we invest include long and short positions in equity securities, fixed income securities (including various agency and non-agency asset-based securities), currencies, commodities and derivatives (including various swaps and forward contracts). These investments are valued at quoted market prices or, where quoted market prices are not available, are fair valued based on the pricing policies and procedures of the underlying funds. U.S. Treasury Bills, the majority of which are pledged as collateral with clearing organizations, are held in our investment account. These clearing organizations have the ability by contract or custom to sell or re-pledge this collateral. We allocate seed capital to our investment teams to help develop new products and services for our clients. The seed capital trading investments are equity and fixed income products, primarily in the form of separately-managed account portfolios, U.S. mutual funds, Luxembourg funds, Japanese investment trust management funds or Delaware business trusts. We also may allocate seed capital to investments in private equity funds, such as a third-party venture capital fund that invests in communications, consumer, digital media, healthcare and information technology markets. In regard to our seed capital investments, the amounts above reflect those funds in which we are not the primary beneficiary of a VIE or hold a controlling financial interest in a VOE. See Note 13, Consolidated Company-Sponsored Investment Funds , for the seed capital investments that are consolidated entities. As of June 30, 2017 and December 31, 2016 , our total seed capital investments were $465.9 million and $500.0 million , respectively. Seed capital investments in unconsolidated company-sponsored investment funds are valued using published net asset values or non-published net asset values if they are not listed on an active exchange but have net asset values that are comparable to funds with published net asset values and have no redemption restrictions. Trading securities also include long positions in corporate equities and long exchange-traded options traded through our options desk. The portion of trading gains (losses) for the three and six months ended June 30, 2017 and 2016 related to trading securities held as of June 30, 2017 and 2016 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Net gains recognized during the period $ 2,505 $ 7,394 $ 16,265 $ 8,626 Less: net gains (losses) recognized during the period on trading securities sold during the period 11,616 (2,335 ) 12,539 (12,696 ) Unrealized (losses) gains recognized during the period on trading securities held $ (9,111 ) $ 9,729 $ 3,726 $ 21,322

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments See Note 13, Consolidated Company-Sponsored Investment Funds , for disclosure of derivative instruments held by our consolidated company-sponsored investment funds. We enter into various futures, forwards, options and swaps to economically hedge certain seed capital investments. Also, we have currency forwards that economically hedge certain balance sheet exposures. In addition, our options desk trades long and short exchange-traded equity options. We do not hold any derivatives designated in a formal hedge relationship under Accounting Standards Codification (“ASC”) 815-10, Derivatives and Hedging . The notional value and fair value as of June 30, 2017 and December 31, 2016 for derivative instruments (excluding derivative instruments relating to our options desk trading activities discussed below ) not designated as hedging instruments were as follows: Fair Value Notional Value Asset Derivatives Liability Derivatives (in thousands) June 30, 2017: Exchange-traded futures $ 98,938 $ 813 $ 916 Currency forwards 190,292 5,666 5,156 Interest rate swaps 34,038 898 970 Credit default swaps 32,399 423 1,015 Total return swaps 63,770 76 119 Total derivatives $ 419,437 $ 7,876 $ 8,176 December 31, 2016: Exchange-traded futures $ 103,108 $ 1,224 $ 1,092 Currency forwards 180,820 4,541 4,711 Interest rate swaps 40,664 940 897 Credit default swaps 45,108 1,205 905 Total return swaps 90,043 503 1,044 Total derivatives $ 459,743 $ 8,413 $ 8,649 As of June 30, 2017 and December 31, 2016 , the derivative assets and liabilities are included in both receivables and payables to brokers and dealers on our condensed consolidated statements of financial condition. The gains and losses for derivative instruments (excluding our options desk trading activities) for the three and six months ended June 30, 2017 and 2016 recognized in investment gains (losses) in the condensed consolidated statements of income were as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Exchange-traded futures $ (3,301 ) $ (913 ) $ (8,833 ) $ 2,433 Currency forwards 132 (685 ) (930 ) (1,820 ) Interest rate swaps (151 ) (559 ) (248 ) (1,931 ) Credit default swaps (237 ) (198 ) (909 ) (606 ) Options swaps — 39 — 87 Total return swaps (1,830 ) (2,736 ) (3,959 ) (6,772 ) Net (losses) on derivative instruments $ (5,387 ) $ (5,052 ) $ (14,879 ) $ (8,609 ) We may be exposed to credit-related losses in the event of nonperformance by counterparties to derivative financial instruments. We minimize our counterparty exposure through a credit review and approval process. In addition, we have executed various collateral arrangements with counterparties to the over-the-counter derivative transactions that require both pledging and accepting collateral in the form of cash. As of June 30, 2017 , we had no cash collateral payable to trade counterparties. As of December 31, 2016 , we held $0.8 million of cash collateral payable to trade counterparties. This obligation to return cash is reported in payables to brokers and dealers in our condensed consolidated statements of financial condition. Although notional amount is the most commonly used measure of volume in the derivative market, it is not used as a measure of credit risk. Generally, the current credit exposure of our derivative contracts is limited to the net positive estimated fair value of derivative contracts at the reporting date after taking into consideration the existence of netting agreements and any collateral received. A derivative with positive value (a derivative asset) indicates existence of credit risk because the counterparty would owe us if the contract were closed. Alternatively, a derivative contract with negative value (a derivative liability) indicates we would owe money to the counterparty if the contract were closed. Generally, if there is more than one derivative transaction with a single counterparty, a master netting arrangement exists with respect to derivative transactions with that counterparty to provide for aggregate net settlement. Certain of our standardized contracts for over-the-counter derivative transactions (“ISDA Master Agreements”) contain credit risk related contingent provisions pertaining to each counterparty’s credit rating. In some ISDA Master Agreements, if the counterparty’s credit rating, or in some agreements, our assets under management (“AUM”), falls below a specified threshold, either a default or a termination event permitting the counterparty to terminate the ISDA Master Agreement would be triggered. In all agreements that provide for collateralization, various levels of collateralization of net liability positions are applicable, depending on the credit rating of the counterparty. As of June 30, 2017 and December 31, 2016 , we delivered $5.6 million and $6.2 million , respectively, of cash collateral into brokerage accounts. We report this cash collateral in cash and cash equivalents in our condensed consolidated statements of financial condition. As of June 30, 2017 and December 31, 2016 , we held $8.3 million and $3.1 million , respectively, of long exchange-traded equity options, which are classified as trading investments and included in other investments on our condensed consolidated statements of financial condition. In addition, as of June 30, 2017 and December 31, 2016 , we held $7.5 million and $0.7 million , respectively, of short exchange-traded equity options, which are included in securities sold not yet purchased on our condensed consolidated statements of financial condition. Our options desk provides our clients with equity derivative strategies and execution for exchange-traded options on single stocks, exchange-traded funds and indices. While predominately agency-based, the options desk may commit capital to facilitate a client’s transaction. Our options desk hedges the risks associated with this activity by taking offsetting positions in equities. For the three and six months ended June 30, 2017 , we recognized $5.4 million and $9.2 million , respectively, of losses on equity options activity. For the three and six months ended June 30, 2016 , we recognized $8.1 million and $16.7 million , respectively, of losses on equity options activity. These losses are recognized in investment gains (losses) in the condensed consolidated statements of income.

Offsetting Assets and Liabiliti

Offsetting Assets and Liabilities	6 Months Ended
	Jun. 30, 2017
Offsetting [Abstract]
Offsetting Assets and Liabilities	Offsetting Assets and Liabilities See Note 13, Consolidated Company-Sponsored Investment Funds , for disclosure of offsetting assets and liabilities of our consolidated company-sponsored investment funds. Offsetting of assets as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount (in thousands) June 30, 2017: Securities borrowed $ 55,323 $ — $ 55,323 $ (52,150 ) $ — $ 3,173 Derivatives $ 7,876 $ — $ 7,876 $ — $ — $ 7,876 Long exchange-traded options $ 8,348 $ — $ 8,348 $ — $ — $ 8,348 December 31, 2016: Securities borrowed $ 82,814 $ — $ 82,814 $ (80,277 ) $ — $ 2,537 Derivatives $ 8,413 $ — $ 8,413 $ — $ (810 ) $ 7,603 Long exchange-traded options $ 3,106 $ — $ 3,106 $ — $ — $ 3,106 Offsetting of liabilities as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Cash Collateral Pledged Net Amount (in thousands) June 30, 2017: Securities loaned $ 28,750 $ — $ 28,750 $ (28,616 ) $ — $ 134 Derivatives $ 8,176 $ — $ 8,176 $ — $ (5,564 ) $ 2,612 Short exchange-traded options $ 7,510 $ — $ 7,510 $ — $ — $ 7,510 December 31, 2016: Securities loaned $ — $ — $ — $ — $ — $ — Derivatives $ 8,649 $ — $ 8,649 $ — $ (6,239 ) $ 2,410 Short exchange-traded options $ 692 $ — $ 692 $ — $ — $ 692 Cash collateral, whether pledged or received on derivative instruments, is not considered material and, accordingly, is not disclosed by counterparty.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value	Fair Value See Note 13, Consolidated Company-Sponsored Investment Funds , for disclosure of fair value of our consolidated company-sponsored investment funds. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability ( i.e. , the “exit price”) in an orderly transaction between market participants at the measurement date. The three broad levels of fair value hierarchy are as follows: • Level 1 – Quoted prices in active markets are available for identical assets or liabilities as of the reported date. • Level 2 – Quoted prices in markets that are not active or other pricing inputs that are either directly or indirectly observable as of the reported date. • Level 3 – Prices or valuation techniques that are both significant to the fair value measurement and unobservable as of the reported date. These financial instruments do not have two-way markets and are measured using management’s best estimate of fair value, where the inputs into the determination of fair value require significant management judgment or estimation. Assets and Liabilities Measured at Fair Value on a Recurring Basis Valuation of our financial instruments by pricing observability levels as of June 30, 2017 and December 31, 2016 was as follows (in thousands): Level 1 Level 2 Level 3 NAV Expedient (1) Other Total June 30, 2017: Money markets $ 173,176 $ — $ — $ — $ — $ 173,176 Securities segregated (U.S. Treasury Bills) — 1,007,079 — — — 1,007,079 Derivatives 813 7,063 — — — 7,876 Investments Trading U.S. Treasury Bills — 27,764 — — — 27,764 Equity securities 204,418 4,006 114 65 — 208,603 Fixed income securities 78,328 11,365 — 13 — 89,706 Long exchange-traded options 8,348 — — — — 8,348 Limited partnership hedge funds (2) — — — — 38,679 38,679 Private equity — — 4,914 39,938 — 44,852 Time deposits (3) — — — — 50,429 50,429 Other Available-for-sale 102 — — — — 102 Other investments (2)(4) — — — — 11,498 11,498 Total investments 291,196 43,135 5,028 40,016 100,606 479,981 Total assets measured at fair value $ 465,185 $ 1,057,277 $ 5,028 $ 40,016 $ 100,606 $ 1,668,112 Securities sold not yet purchased Short equities – corporate $ 15,042 $ — $ — $ — $ — $ 15,042 Short exchange-traded options 7,510 — — — — 7,510 Derivatives 916 7,260 — — — 8,176 Contingent payment arrangements — — 16,777 — — 16,777 Total liabilities measured at fair value $ 23,468 $ 7,260 $ 16,777 $ — $ — $ 47,505 December 31, 2016: Money markets $ 107,250 $ — $ — $ — $ — $ 107,250 Securities segregated (U.S. Treasury Bills) — 893,189 — — — 893,189 Derivatives 1,224 7,189 — — — 8,413 Investments Trading U.S. Treasury Bills — 28,937 — — — 28,937 Equity securities 148,128 5,724 110 36 — 153,998 Fixed income securities 80,473 11,107 — 12 — 91,592 Long exchange-traded options 3,106 — — — — 3,106 Limited partnership hedge funds (2) — — — — 40,530 40,530 Private equity — — 4,913 40,365 — 45,278 Time deposits (3) — — — — 70,097 70,097 Other Available-for-sale 45 — — — — 45 Other investments (2)(4) — — — — 7,522 7,522 Total investments 231,752 45,768 5,023 40,413 118,149 441,105 Total assets measured at fair value $ 340,226 $ 946,146 $ 5,023 $ 40,413 $ 118,149 $ 1,449,957 Securities sold not yet purchased Short equities – corporate $ 40,252 $ — $ — $ — $ — $ 40,252 Short exchange-traded options 692 — — — — 692 Derivatives 1,092 7,557 — — — 8,649 Contingent payment arrangements — — 17,589 — — 17,589 Total liabilities measured at fair value $ 42,036 $ 7,557 $ 17,589 $ — $ — $ 67,182 (1) Investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) Investments in equity method investees that are not measured at fair value in accordance with GAAP. (3) Investments carried at amortized cost that are not measured at fair value in accordance with GAAP. (4) Investments carried at cost that are not measured at fair value in accordance with GAAP. One of our private equity investments (measured at fair value using NAV as a practical expedient) is a venture capital fund with a fair value of $39.9 million and unfunded commitment of $0.8 million as of June 30, 2017, invests in communications, consumer, digital media, healthcare and information technology markets. The fair value of this investment has been estimated using the capital account balances provided by the partnership. The interest in this partnership cannot be redeemed. We provide below a description of the fair value methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy: • Money markets : We invest excess cash in various money market funds that are valued based on quoted prices in active markets; these are included in Level 1 of the valuation hierarchy. • Treasury Bills : We hold U.S. Treasury Bills, which are primarily segregated in a special reserve bank custody account as required by Rule 15c3-3 of the Exchange Act. These securities are valued based on quoted yields in secondary markets and are included in Level 2 of the valuation hierarchy. • Equity and fixed income securities : Our equity and fixed income securities consist principally of company-sponsored mutual funds with NAVs and various separately-managed portfolios consisting primarily of equity and fixed income securities with quoted prices in active markets, which are included in Level 1 of the valuation hierarchy. In addition, some securities are valued based on observable inputs from recognized pricing vendors, which are included in Level 2 of the valuation hierarchy. • Derivatives : We hold exchange-traded futures with counterparties that are included in Level 1 of the valuation hierarchy. In addition, we also hold currency forward contracts, interest rate swaps, credit default swaps, option swaps and total return swaps with counterparties that are valued based on observable inputs from recognized pricing vendors, which are included in Level 2 of the valuation hierarchy. • Options : We hold long exchange-traded options that are included in Level 1 of the valuation hierarchy. • Private equity : Generally, the valuation of private equity investments requires significant management judgment due to the absence of quoted market prices, inherent lack of liquidity and the long-term nature of such investments. Private equity investments are valued initially at cost. The carrying values of private equity investments are adjusted either up or down from cost to reflect expected exit values as evidenced by financing and sale transactions with third parties, or when determination of a valuation adjustment is confirmed through ongoing review in accordance with our valuation policies and procedures. A variety of factors are reviewed and monitored to assess positive and negative changes in valuation, including current operating performance and future expectations of investee companies, industry valuations of comparable public companies, changes in market outlooks, and the third party financing environment over time. In determining valuation adjustments resulting from the investment review process, particular emphasis is placed on current company performance and market conditions. For these reasons, which make the fair value of private equity investments unobservable, equity investments are included in Level 3 of the valuation hierarchy. If private equity investments become publicly traded, they are included in Level 1 of the valuation hierarchy; provided, however, if they contain trading restrictions, publicly-traded equity investments are included in Level 2 of the valuation hierarchy until the trading restrictions expire. • Securities sold not yet purchased : Securities sold not yet purchased, primarily reflecting short positions in equities and exchange-traded options, are included in Level 1 of the valuation hierarchy. • Contingent payment arrangements : Contingent payment arrangements relate to contingent payment liabilities associated with various acquisitions. At each reporting date, we estimate the fair values of the contingent consideration expected to be paid based upon probability-weighted AUM and revenue projections, using unobservable market data inputs, which are included in Level 3 of the valuation hierarchy. During the six months ended June 30, 2017, there were no transfers between Level 1 and Level 2 securities. The change in carrying value associated with Level 3 financial instruments carried at fair value, classified as private equity and trading equity securities, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 5,026 $ 6,605 $ 5,023 $ 16,148 Reclassification (see below) — — — (9,532 ) Purchases — — — — Sales — — — — Realized gains (losses), net — — — — Unrealized gains (losses), net 2 (1,667 ) 5 (1,678 ) Balance as of end of period $ 5,028 $ 4,938 $ 5,028 $ 4,938 Transfers into and out of all levels of the fair value hierarchy are reflected at end-of-period fair values. We reclassified the investments of our consolidated private equity fund from investments to investments of consolidated company-sponsored investment funds on our condensed consolidated statement of financial condition ( see Note 13, Consolidated Company-Sponsored Investment Funds) . Realized and unrealized gains and losses on Level 3 financial instruments are recorded in investment gains and losses in the condensed consolidated statements of income. As of June 30, 2017 and December 31, 2016 , we have an investment in a private equity fund focused exclusively on the energy sector (fair value of $4.9 million for both periods) that is classified as Level 3.This investment's valuation is based on a market approach, considering recent transactions in the fund and the industry. The change in carrying value associated with Level 3 financial instruments carried at fair value, classified as contingent payment arrangements, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 17,177 $ 31,119 $ 17,589 $ 31,399 Accretion 177 353 355 706 Payments (577 ) (611 ) (1,167 ) (1,244 ) Balance as of end of period $ 16,777 $ 30,861 $ 16,777 $ 30,861 As of June 30, 2017 and December 31, 2016 , the three acquisition-related contingent consideration liabilities recorded have a combined fair value of $16.8 million and $17.6 million , respectively, and are valued using a projected AUM weighted average growth rate of 18% for one acquisition, and revenue growth rates and discount rates ranging from 4% to 31% and 1.4% to 6.4% , respectively, for the three acquisitions. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis We did not have any material assets or liabilities that were measured at fair value for impairment on a nonrecurring basis during the six months ended June 30, 2017 or during the year ended December 31, 2016 .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings With respect to all significant litigation matters, we consider the likelihood of a negative outcome. If we determine the likelihood of a negative outcome is probable and the amount of the loss can be reasonably estimated, we record an estimated loss for the expected outcome of the litigation. If the likelihood of a negative outcome is reasonably possible and we are able to determine an estimate of the possible loss or range of loss in excess of amounts already accrued, if any, we disclose that fact together with the estimate of the possible loss or range of loss. However, it is often difficult to predict the outcome or estimate a possible loss or range of loss because litigation is subject to inherent uncertainties, particularly when plaintiffs allege substantial or indeterminate damages. Such is also the case when the litigation is in its early stages or when the litigation is highly complex or broad in scope. In these cases, we disclose that we are unable to predict the outcome or estimate a possible loss or range of loss. AB may be involved in various matters, including regulatory inquiries, administrative proceedings and litigation, some of which may allege significant damages. It is reasonably possible that we could incur losses pertaining to these matters, but currently we cannot estimate any such losses. Management, after consultation with legal counsel, currently believes that the outcome of any individual matter that is pending or threatened, or all of them combined, will not have a material adverse effect on our results of operations, financial condition or liquidity. However, any inquiry, proceeding or litigation has an element of uncertainty; management cannot determine whether further developments relating to any individual matter that is pending or threatened, or all of them combined, will have a material adverse effect on our results of operation, financial condition or liquidity in any future reporting period.

Consolidated Company-Sponsored

Consolidated Company-Sponsored Investment Funds	6 Months Ended
	Jun. 30, 2017
Consolidated Company-Sponsored Investment Funds [Abstract]
Consolidated Company-Sponsored Investment Funds	Consolidated Company-Sponsored Investment Funds We regularly provide seed capital to new company-sponsored investment funds. As such, we may consolidate or de-consolidate a variety of company-sponsored investment funds each quarter. Due to the similarity of risks related to our involvement with each company-sponsored investment fund, disclosures required under the VIE model are aggregated, such as disclosures regarding the carrying amount and classification of assets. We are not required to provide financial support to company-sponsored investment funds and only the assets of such funds are available to settle each fund's own liabilities. Our exposure to loss in regard to consolidated company-sponsored investment funds is limited to our investment in, and our management fee earned from, such funds. Equity and debt holders of such funds have no recourse to AB’s assets or to the general credit of AB. The balances of consolidated VIEs and VOEs included in our condensed consolidated statements of financial condition were as follows: June 30, 2017 December 31, 2016 (in thousands) VIEs VOEs Total VIEs VOEs Total Cash and cash equivalents $ 364,738 $ 39 $ 364,777 $ 337,525 $ — $ 337,525 Investments 629,680 29,656 659,336 550,850 23,226 574,076 Other assets 6,044 913 6,957 44,570 — 44,570 Total assets $ 1,000,462 $ 30,608 $ 1,031,070 $ 932,945 $ 23,226 $ 956,171 Liabilities $ 416,194 $ 9,853 $ 426,047 $ 292,800 $ — $ 292,800 Redeemable non-controlling interest 335,440 — 335,440 384,294 — 384,294 Partners' capital attributable to AB Unitholders 212,660 20,755 233,415 221,229 23,226 244,455 Non-redeemable non-controlling interests in consolidated entities 36,168 — 36,168 34,622 — 34,622 Total liabilities, redeemable non-controlling interest and partners' capital $ 1,000,462 $ 30,608 $ 1,031,070 $ 932,945 $ 23,226 $ 956,171 Fair Value Cash and cash equivalents include cash on hand, demand deposits, overnight commercial paper and highly liquid investments with original maturities of three months or less. Due to the short-term nature of these instruments, the recorded value has been determined to approximate fair value. Valuation of consolidated company-sponsored investment funds' financial instruments by pricing observability levels as of June 30, 2017 and December 31, 2016 was as follows (in thousands): Level 1 Level 2 Level 3 NAV Expedient Total June 30, 2017: Investments - VIEs $ 526,097 $ 100,725 $ 2,777 $ 81 $ 629,680 Investments - VOEs 12,757 16,879 20 — 29,656 Derivatives - VIEs 70 1,487 — — 1,557 Derivatives - VOEs 1 9 — — 10 Total assets measured at fair value $ 538,925 $ 119,100 $ 2,797 $ 81 $ 660,903 Short equities - VIEs $ 406,811 $ — $ — $ — $ 406,811 Derivatives - VIEs 30 2,823 — — 2,853 Derivatives - VOEs — 9 — — 9 Total liabilities measured at fair value $ 406,841 $ 2,832 $ — $ — $ 409,673 December 31, 2016: Investments - VIEs $ 341,830 $ 203,197 $ 5,741 $ 82 $ 550,850 Investments - VOEs 10,188 12,061 — 977 23,226 Derivatives - VIEs 58 1,739 — — 1,797 Total assets measured at fair value $ 352,076 $ 216,997 $ 5,741 $ 1,059 $ 575,873 Short equities - VIEs $ 248,419 $ — $ — $ — $ 248,419 Derivatives - VIEs 48 2,033 — — 2,081 Total liabilities measured at fair value $ 248,467 $ 2,033 $ — $ — $ 250,500 See Note 11 for a description of the fair value methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy. The change in carrying value associated with Level 3 financial instruments carried at fair value within consolidated company-sponsored investment funds was as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 10,273 $ 15,426 $ 5,741 $ — Impact of adoption of ASU 2015-02 — — — 14,740 Deconsolidated funds (6,697 ) — (6,697 ) — Transfers in (out) (336 ) (1,315 ) 413 (1,315 ) Purchases 435 350 5,012 356 Sales (824 ) (455 ) (1,897 ) (508 ) Realized (losses), net 8 (39 ) (4 ) (39 ) Unrealized gains (losses), net (54 ) (838 ) 217 (123 ) Accrued discounts (8 ) (21 ) 12 (3 ) Balance as of end of period $ 2,797 $ 13,108 $ 2,797 $ 13,108 The level 3 securities primarily consist of corporate bonds that are vendor priced with no ratings available, bank loans, non-agency collateralized mortgage obligations and asset-backed securities. Transfers into and out of all levels of the fair value hierarchy are reflected at end-of-period fair values. Realized and unrealized gains and losses on Level 3 financial instruments are recorded in investment gains and losses in the condensed consolidated statements of income. Derivative Instruments As of June 30, 2017 and December 31, 2016 , the VIEs held $11.6 million and $2.9 million (net), respectively, of futures, forwards and swaps within their portfolios (including $12.9 million and $3.2 million , respectively, of derivatives included in their investments balance on the condensed consolidated statements of financial condition). For the three and six months ended June 30, 2017 , we recognized $7.8 million and $15.0 million , respectively, of gains on these derivative positions. For the three and six months ended June 30, 2016 , we recognized $0.3 million of losses and $2.7 million of gains, respectively, on these derivative positions. These gains and losses are recognized in investment gains (losses) in the condensed consolidated statements of income. As of June 30, 2017 and December 31, 2016 , the VIEs held $0.1 million and $0.5 million , respectively, of cash collateral payable to trade counterparties. This obligation to return cash is reported in the liabilities of consolidated company-sponsored investment funds in our condensed consolidated statements of financial condition. As of June 30, 2017 and December 31, 2016 , the VIEs delivered $3.8 million and $3.3 million , respectively, of cash collateral into brokerage accounts. The VIEs report this cash collateral in the consolidated company-sponsored investment funds cash and cash equivalents in our condensed consolidated statements of financial condition. Offsetting Assets and Liabilities Offsetting of derivative assets of consolidated company-sponsored investment funds as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Collateral Received Net Amount (in thousands) June 30, 2017: Derivatives - VIEs $ 14,422 $ — $ 14,422 $ — $ (88 ) $ 14,334 Derivatives - VOEs $ 10 $ — $ 10 $ — $ — $ 10 December 31, 2016: Derivatives - VIEs $ 4,997 $ — $ 4,997 $ — $ (461 ) $ 4,536 Offsetting of derivative liabilities of consolidated company-sponsored investment funds as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Collateral Pledged Net Amount (in thousands) June 30, 2017: Derivatives - VIEs $ 2,853 $ — $ 2,853 $ — $ (2,853 ) $ — Derivatives - VOEs $ 9 $ — $ 9 $ — $ (1 ) $ 8 December 31, 2016: Derivatives - VIEs $ 2,081 $ — $ 2,081 $ — $ (2,081 ) $ — Cash collateral, whether pledged or received on derivative instruments, is not considered material and, accordingly, is not disclosed by counterparty. Non-Consolidated VIEs As of June 30, 2017 , the net assets of company-sponsored investment products that are non-consolidated VIEs are approximately $49.4 billion , and our maximum risk of loss is our investment of $19.5 million in these VIEs and advisory fee receivables from these VIEs, which are not material.

Units Outstanding

Units Outstanding	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Units Outstanding	Units Outstanding Changes in AB Units outstanding during the six -month period ended June 30, 2017 were as follows: Outstanding as of December 31, 2016 268,893,534 Options exercised 545,458 Units issued 1,876,205 Units retired (1) (5,601,111 ) Balance as of June 30, 2017 265,714,086 (1) Includes 30,400 AB Units purchased in private transactions and retired during the first six months of 2017.

Debt

Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Debt	Debt As of June 30, 2017 and December 31, 2016 , AB had $482.4 million and $513.0 million , respectively, in commercial paper outstanding with weighted average interest rates of approximately 1.3% and 0.9% , respectively. The commercial paper is short term in nature, and as such, recorded value is estimated to approximate fair value (and considered a Level 2 security in the fair value hierarchy). Average daily borrowings of commercial paper during the first six months of 2017 and the full year 2016 were $557.3 million and $422.9 million , respectively, with weighted average interest rates of approximately 1.0% and 0.6% , respectively. AB has a $200.0 million , unsecured 364 -day senior revolving credit facility (the "Revolver") with a leading international bank and the other lending institutions that may be party thereto. The Revolver is available for AB's and SCB LLC's business purposes, including the provision of additional liquidity to meet funding requirements primarily related to SCB LLC's operations. Both AB and SCB LLC can draw directly under the Revolver and management expects to draw on the Revolver from time to time. AB has agreed to guarantee the obligations of SCB LLC under the Revolver. As of June 30, 2017 , we had a loan outstanding of $30.0 million with a weighted average interest rate of approximately 2.2% . As of December 31, 2016 , we had no amounts outstanding under the Revolver. Average daily borrowing of the Revolver during the first six months of 2017 and full year 2016 were $22.4 million and $7.3 million , respectively, with weighted average interest rates of approximately 1.8% and 1.6% , respectively.

Changes in Capital

Changes in Capital	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Changes in Capital	Changes in Capital Changes in capital during the six -month period ended June 30, 2017 were as follows: Partners’ Capital Attributable to AB Unitholders Non-Controlling Interests In Consolidated Entities Total Capital (in thousands) Balance as of December 31, 2016 $ 4,032,017 $ 36,172 $ 4,068,189 Comprehensive income: Net income 275,040 9,610 284,650 Other comprehensive income, net of tax: Unrealized gains on investments 8 — 8 Foreign currency translation adjustments 15,407 949 16,356 Changes in employee benefit related items 456 — 456 Comprehensive income 290,911 10,559 301,470 Distributions to General Partner and unitholders (339,139 ) — (339,139 ) Compensation-related transactions (96,889 ) — (96,889 ) Capital contributions to affiliates (280 ) — (280 ) Purchase of non-controlling interest 173 (2,006 ) (1,833 ) Distributions to non-controlling interests of our consolidated venture capital fund — (7,868 ) (7,868 ) Other (679 ) — (679 ) Balance as of June 30, 2017 $ 3,886,114 $ 36,857 $ 3,922,971 Changes in capital during the six -month period ended June 30, 2016 were as follows: Partners’ Capital Attributable to AB Unitholders Non-Controlling Interests In Consolidated Entities Total Capital (in thousands) Balance as of December 31, 2015 $ 3,992,748 $ 24,473 $ 4,017,221 Comprehensive income: Net income (loss) 290,785 (6,953 ) 283,832 Other comprehensive income, net of tax: Unrealized (losses) on investments (13 ) — (13 ) Foreign currency translation adjustments 107 (5 ) 102 Changes in employee benefit related items (36 ) — (36 ) Comprehensive income 290,843 (6,958 ) 283,885 Distributions to General Partner and unitholders (275,930 ) — (275,930 ) Compensation-related transactions (76,983 ) — (76,983 ) Capital contributions from affiliates (120 ) — (120 ) Other (337 ) — (337 ) Balance as of June 30, 2016 $ 3,930,221 $ 17,515 $ 3,947,736 We decreased our June 30, 2016 partners' capital attributable to AB Unitholders and total capital reported in prior periods by $43.0 million as a result of a financial statement revision in the third quarter of 2016. Please see Note 1 for further discussion. During 2016, deferred taxes were not recognized on foreign currency translation adjustments for foreign subsidiaries which had earnings that were considered permanently invested outside the United States.

Non-controlling Interests

Non-controlling Interests	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Non-controlling Interests	Non-controlling Interests Non-controlling interest in net income for the three and six months ended June 30, 2017 and 2016 consisted of the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Non-redeemable non-controlling interests: Consolidated company-sponsored investment funds $ 7,930 $ (150 ) $ 9,415 $ (7,153 ) Other 48 101 195 200 Total non-redeemable non-controlling interests 7,978 (49 ) 9,610 (6,953 ) Redeemable non-controlling interests: Consolidated company-sponsored investment funds 9,191 4,892 23,877 6,048 Total non-controlling interest in net income (loss) $ 17,169 $ 4,843 $ 33,487 $ (905 ) Non-redeemable non-controlling interest as of June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Consolidated company-sponsored investment funds $ 36,168 $ 34,622 Other 689 1,550 Total non-redeemable non-controlling interest $ 36,857 $ 36,172 Redeemable non-controlling interest as of June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Consolidated company-sponsored investment funds $ 335,440 $ 384,294 CPH Capital Fondsmaeglerselskab A/S acquisition 8,664 8,665 Total redeemable non-controlling interest $ 344,104 $ 392,959

Business Description Organiza24

Business Description Organization and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The interim condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the interim results, have been made. The preparation of the condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the interim reporting periods. Actual results could differ from those estimates. The condensed consolidated statement of financial condition as of December 31, 2016 was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”).
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include AB and its majority-owned and/or controlled subsidiaries, and the consolidated entities that are considered to be variable interest entities ("VIEs") and voting interest entities ("VOEs") and for which AB has a controlling financial interest. Non-controlling interests on the condensed consolidated statements of financial condition includes the portion of consolidated company-sponsored investment funds in which we do not have direct equity ownership. All significant inter-company transactions and balances among the consolidated entities have been eliminated.
Reclassifications	Reclassifications During 2017, prior period amounts for our VOEs' investments previously presented as other investments are now presented as investments of consolidated company-sponsored investment funds in the condensed consolidated statements of financial condition to conform to the current period's presentation. Additionally, prior period amounts for dividend and interest related to our consolidated company-sponsored investment funds previously presented as other revenues are now presented as dividend and interest income in the condensed consolidated statements of income to conform to the current period's presentation.
Recently Adopted Accounting Pronouncements/Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU') 2016-07, Investments - Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . The amendment eliminates the current requirement for a retroactive adjustment and instead requires that the investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Additionally, the amendment requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. We adopted this standard on January 1, 2017. The adoption of this standard did not have a material impact on our financial condition or results of operations. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting . The amendment includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements, including income tax effects of share-based payments, minimum statutory tax withholding requirements and forfeitures. We adopted this standard on January 1, 2017 on a prospective basis. The adoption of this standard did not have a material impact on our financial condition or results of operations. Accounting Pronouncements Not Yet Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . The amendment is effective retrospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2017. Management currently is evaluating the impact that the adoption of this standard will have on our consolidated financial statements. We have not yet completed this analysis, but based on the analysis completed to date management does not expect the standard to have a material impact on our financial condition or results of operations. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities . The amendment addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments and is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017. The amendment will result in a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, except for one provision relating to equity securities without readily determinable fair values, which provision will be applied prospectively. The amendment is not expected to have a material impact on our financial condition or results of operations. In February 2016, the FASB issued ASU 2016-02, Leases . The amendment requires recognition of lease assets and lease liabilities on the statement of financial condition and disclosure of key information about leasing arrangements. Specifically, this guidance requires an operating lease lessee to recognize on the statement of financial condition a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term. However, for leases with a term of twelve months or less, a lessee is permitted to make an accounting policy election not to recognize lease assets and lease liabilities. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2018 and requires lessees to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach. Management currently is evaluating the impact that the adoption of this standard will have on our consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) . The amendment is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017 and should be applied using a retrospective transition method. The amendment is not expected to have a material impact on our financial condition or results of operations. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test for Goodwill Impairment . The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. The revised guidance will be applied prospectively, and is effective in 2020. The revised guidance is not expected to have a material impact on our financial condition or results of operations. In March 2017, the FASB issued ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . The amendment requires that an employer disaggregate the service cost component from the other components of net benefit costs on the income statement. The amendment is effective for fiscal years (and interim periods within those years) beginning after December 15, 2017 and should be applied retrospectively. The amendment is not expected to have a material impact on our results of operations. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation, Scope of Modification Accounting . The amendment provides clarity and reduces both diversity in practice and cost and complexity when applying the guidance in Topic 718, Compensation - Stock Compensation, to a change to the terms or conditions of a share-based payment award. This amendment is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 and will be applied prospectively to an award modified on or after the adoption date. This amendment is not expected to have a material impact on our results of operations.
Consolidation of company-sponsored investment funds	Consolidation of company-sponsored investment funds We adopted ASU 2015-02, Consolidation - Amendments to the Consolidation Analysis ( "ASU 2015-02") effective January 1, 2016. For legal entities (company-sponsored investment funds) evaluated for consolidation, we first determine whether the fees we receive and the interests we hold qualify as a variable interest in the entity, including an evaluation of fees paid to us as a decision maker or service provider to the entity being evaluated. Fees received by us are not variable interests if (i) the fees are compensation for services provided and are commensurate with the level of effort required to provide those services, (ii) the service arrangement includes only terms, conditions or amounts that are customarily present in arrangements for similar services negotiated at arm’s length, and (iii) our other economic interests in the entity held directly and indirectly through our related parties, as well as economic interests held by related parties under common control, would not absorb more than an insignificant amount of the entity’s losses or receive more than an insignificant amount of the entity’s benefits. For those entities in which we have a variable interest, we perform an analysis to determine whether the entity is a VIE by considering whether the entity’s equity investment at risk is insufficient, whether the investors lack decision making rights proportional to their ownership percentage of the entity, and whether the investors lack the obligation to absorb an entity’s expected losses or the right to receive an entity’s expected income. A VIE must be consolidated by its primary beneficiary, which generally is defined as the party that has a controlling financial interest in the VIE. We are deemed to have a controlling financial interest in a VIE if we have (i) the power to direct the activities of the VIE that most significantly affect the VIE's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive income from the VIE that could potentially be significant to the VIE. For purposes of evaluating (ii) above, fees paid to us as a decision maker or service provider are excluded if the fees are compensation for services provided commensurate with the level of effort required to be performed and the arrangement includes only customary terms, conditions or amounts present in arrangements for similar services negotiated at arm’s length. The primary beneficiary evaluation generally is performed qualitatively based on all facts and circumstances, as well as quantitatively, as appropriate. If we have a variable interest in an entity that is determined not to be a VIE, the entity is then evaluated for consolidation under the VOE model. For limited partnerships and similar entities, we are deemed to have a controlling financial interest in a VOE, and would be required to consolidate the entity, if we own a majority of the entity’s kick-out rights through voting limited partnership interests and limited partners do not hold substantive participating rights (or other rights that would indicate that we do not control the entity). For entities other than limited partnerships, we are deemed to have a controlling financial interest in a VOE if we own a majority voting interest in the entity. The analysis performed regarding the determination of variable interests held, whether entities are VIEs or VOEs, and whether we have a controlling financial interest in such entities requires the exercise of judgment. The analysis is updated continuously as circumstances change or new entities are formed.

Business Description Organiza25

Business Description Organization and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Ownership Structure of AB as a Percentage of General and Limited Partnership Interests	As of June 30, 2017 , the ownership structure of AB, including limited partnership units outstanding as well as the general partner's 1% interest, is as follows: AXA and its subsidiaries 64.0 % AB Holding 34.8 Unaffiliated holders 1.2 100.0 %
Summary of Revision	The table below reflects the revisions to these line items for the three and six months ended June 30, 2016 that are included in this Form 10-Q: Three Months Ended June 30, 2016 As Reported Adjustment As Revised (in thousands, except per unit amounts) Income taxes $ 10,588 $ 2,643 $ 13,231 Net income attributable to AB Unitholders 127,144 (2,643 ) 124,501 Basic net income per AB Unit 0.47 (0.01 ) 0.46 Diluted net income per AB Unit 0.47 (0.01 ) 0.46 Six Months Ended June 30, 2016 As Reported Adjustment As Revised (in thousands, except per unit amounts) Income taxes $ 20,452 $ 5,285 $ 25,737 Net income attributable to AB Unitholders 296,070 (5,285 ) 290,785 Basic net income per AB Unit 1.08 (0.02 ) 1.06 Diluted net income per AB Unit 1.08 (0.02 ) 1.06

Real Estate Charges (Tables)

Real Estate Charges (Tables)	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Real Estate Liability Account Activity Related to Office Space Consolidation Initiatives	The activity in the liability account relating to our global space consolidation initiatives for the following periods is: Six Months Ended Twelve Months Ended (in thousands) Balance as of beginning of period $ 112,932 $ 123,912 Expense (credit) incurred 15,940 12,248 Deferred rent 3,601 4,930 Payments made (20,861 ) (32,988 ) Interest accretion 2,074 4,830 Balance as of end of period $ 113,686 $ 112,932

Net Income per Unit (Tables)

Net Income per Unit (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Unit [Abstract]
Schedule of Earnings Per Unit, Basic and Diluted	Basic net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the total of the diluted weighted average number of units outstanding for each period. Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands, except per unit amounts) Net income attributable to AB Unitholders $ 135,103 $ 124,501 $ 275,040 $ 290,785 Weighted average units outstanding – basic 268,302 269,720 268,391 270,787 Dilutive effect of compensatory options to buy AB Holding Units 430 650 482 534 Weighted average units outstanding – diluted 268,732 270,370 268,873 271,321 Basic net income per AB Unit $ 0.50 $ 0.46 $ 1.01 $ 1.06 Diluted net income per AB Unit $ 0.50 $ 0.46 $ 1.01 $ 1.06

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Summary of Investments	Investments consist of: June 30, December 31, (in thousands) Trading: U.S. Treasury Bills $ 27,764 $ 28,937 Long-term incentive compensation-related 49,189 50,935 Seed capital 166,739 188,053 Equities 82,381 6,602 Exchange-traded options 8,348 3,106 Investments in limited partnership hedge funds: Long-term incentive compensation-related 13,396 16,826 Seed capital 25,283 23,704 Private equity (seed capital) 44,852 45,278 Time deposits 50,429 70,097 Other 11,600 7,567 Total investments $ 479,981 $ 441,105
Portion of Trading Gains (Losses) Related to Trading Securities	The portion of trading gains (losses) for the three and six months ended June 30, 2017 and 2016 related to trading securities held as of June 30, 2017 and 2016 were as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Net gains recognized during the period $ 2,505 $ 7,394 $ 16,265 $ 8,626 Less: net gains (losses) recognized during the period on trading securities sold during the period 11,616 (2,335 ) 12,539 (12,696 ) Unrealized (losses) gains recognized during the period on trading securities held $ (9,111 ) $ 9,729 $ 3,726 $ 21,322

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Notional and Fair Value for Derivative Instruments Not Designated as Hedging Instruments	The notional value and fair value as of June 30, 2017 and December 31, 2016 for derivative instruments (excluding derivative instruments relating to our options desk trading activities discussed below ) not designated as hedging instruments were as follows: Fair Value Notional Value Asset Derivatives Liability Derivatives (in thousands) June 30, 2017: Exchange-traded futures $ 98,938 $ 813 $ 916 Currency forwards 190,292 5,666 5,156 Interest rate swaps 34,038 898 970 Credit default swaps 32,399 423 1,015 Total return swaps 63,770 76 119 Total derivatives $ 419,437 $ 7,876 $ 8,176 December 31, 2016: Exchange-traded futures $ 103,108 $ 1,224 $ 1,092 Currency forwards 180,820 4,541 4,711 Interest rate swaps 40,664 940 897 Credit default swaps 45,108 1,205 905 Total return swaps 90,043 503 1,044 Total derivatives $ 459,743 $ 8,413 $ 8,649
Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses) in the Condensed Consolidated Statements of Income	The gains and losses for derivative instruments (excluding our options desk trading activities) for the three and six months ended June 30, 2017 and 2016 recognized in investment gains (losses) in the condensed consolidated statements of income were as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Exchange-traded futures $ (3,301 ) $ (913 ) $ (8,833 ) $ 2,433 Currency forwards 132 (685 ) (930 ) (1,820 ) Interest rate swaps (151 ) (559 ) (248 ) (1,931 ) Credit default swaps (237 ) (198 ) (909 ) (606 ) Options swaps — 39 — 87 Total return swaps (1,830 ) (2,736 ) (3,959 ) (6,772 ) Net (losses) on derivative instruments $ (5,387 ) $ (5,052 ) $ (14,879 ) $ (8,609 )

Offsetting Assets and Liabili30

Offsetting Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2017
Offsetting [Abstract]
Schedule of Offsetting of Financial Assets	Offsetting of assets as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount (in thousands) June 30, 2017: Securities borrowed $ 55,323 $ — $ 55,323 $ (52,150 ) $ — $ 3,173 Derivatives $ 7,876 $ — $ 7,876 $ — $ — $ 7,876 Long exchange-traded options $ 8,348 $ — $ 8,348 $ — $ — $ 8,348 December 31, 2016: Securities borrowed $ 82,814 $ — $ 82,814 $ (80,277 ) $ — $ 2,537 Derivatives $ 8,413 $ — $ 8,413 $ — $ (810 ) $ 7,603 Long exchange-traded options $ 3,106 $ — $ 3,106 $ — $ — $ 3,106
Schedule of Offsetting of Financial Liabilities	Offsetting of liabilities as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Cash Collateral Pledged Net Amount (in thousands) June 30, 2017: Securities loaned $ 28,750 $ — $ 28,750 $ (28,616 ) $ — $ 134 Derivatives $ 8,176 $ — $ 8,176 $ — $ (5,564 ) $ 2,612 Short exchange-traded options $ 7,510 $ — $ 7,510 $ — $ — $ 7,510 December 31, 2016: Securities loaned $ — $ — $ — $ — $ — $ — Derivatives $ 8,649 $ — $ 8,649 $ — $ (6,239 ) $ 2,410 Short exchange-traded options $ 692 $ — $ 692 $ — $ — $ 692

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	Valuation of our financial instruments by pricing observability levels as of June 30, 2017 and December 31, 2016 was as follows (in thousands): Level 1 Level 2 Level 3 NAV Expedient (1) Other Total June 30, 2017: Money markets $ 173,176 $ — $ — $ — $ — $ 173,176 Securities segregated (U.S. Treasury Bills) — 1,007,079 — — — 1,007,079 Derivatives 813 7,063 — — — 7,876 Investments Trading U.S. Treasury Bills — 27,764 — — — 27,764 Equity securities 204,418 4,006 114 65 — 208,603 Fixed income securities 78,328 11,365 — 13 — 89,706 Long exchange-traded options 8,348 — — — — 8,348 Limited partnership hedge funds (2) — — — — 38,679 38,679 Private equity — — 4,914 39,938 — 44,852 Time deposits (3) — — — — 50,429 50,429 Other Available-for-sale 102 — — — — 102 Other investments (2)(4) — — — — 11,498 11,498 Total investments 291,196 43,135 5,028 40,016 100,606 479,981 Total assets measured at fair value $ 465,185 $ 1,057,277 $ 5,028 $ 40,016 $ 100,606 $ 1,668,112 Securities sold not yet purchased Short equities – corporate $ 15,042 $ — $ — $ — $ — $ 15,042 Short exchange-traded options 7,510 — — — — 7,510 Derivatives 916 7,260 — — — 8,176 Contingent payment arrangements — — 16,777 — — 16,777 Total liabilities measured at fair value $ 23,468 $ 7,260 $ 16,777 $ — $ — $ 47,505 December 31, 2016: Money markets $ 107,250 $ — $ — $ — $ — $ 107,250 Securities segregated (U.S. Treasury Bills) — 893,189 — — — 893,189 Derivatives 1,224 7,189 — — — 8,413 Investments Trading U.S. Treasury Bills — 28,937 — — — 28,937 Equity securities 148,128 5,724 110 36 — 153,998 Fixed income securities 80,473 11,107 — 12 — 91,592 Long exchange-traded options 3,106 — — — — 3,106 Limited partnership hedge funds (2) — — — — 40,530 40,530 Private equity — — 4,913 40,365 — 45,278 Time deposits (3) — — — — 70,097 70,097 Other Available-for-sale 45 — — — — 45 Other investments (2)(4) — — — — 7,522 7,522 Total investments 231,752 45,768 5,023 40,413 118,149 441,105 Total assets measured at fair value $ 340,226 $ 946,146 $ 5,023 $ 40,413 $ 118,149 $ 1,449,957 Securities sold not yet purchased Short equities – corporate $ 40,252 $ — $ — $ — $ — $ 40,252 Short exchange-traded options 692 — — — — 692 Derivatives 1,092 7,557 — — — 8,649 Contingent payment arrangements — — 17,589 — — 17,589 Total liabilities measured at fair value $ 42,036 $ 7,557 $ 17,589 $ — $ — $ 67,182 (1) Investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) Investments in equity method investees that are not measured at fair value in accordance with GAAP. (3) Investments carried at amortized cost that are not measured at fair value in accordance with GAAP. (4) Investments carried at cost that are not measured at fair value in accordance with GAAP.
Schedule of Change in Carrying Value Level 3 Financial Instruments	The change in carrying value associated with Level 3 financial instruments carried at fair value, classified as private equity and trading equity securities, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 5,026 $ 6,605 $ 5,023 $ 16,148 Reclassification (see below) — — — (9,532 ) Purchases — — — — Sales — — — — Realized gains (losses), net — — — — Unrealized gains (losses), net 2 (1,667 ) 5 (1,678 ) Balance as of end of period $ 5,028 $ 4,938 $ 5,028 $ 4,938
Schedule of Contingent Payment Arrangements Level 3 Financial Instruments	The change in carrying value associated with Level 3 financial instruments carried at fair value, classified as contingent payment arrangements, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 17,177 $ 31,119 $ 17,589 $ 31,399 Accretion 177 353 355 706 Payments (577 ) (611 ) (1,167 ) (1,244 ) Balance as of end of period $ 16,777 $ 30,861 $ 16,777 $ 30,861

Consolidated Company-Sponsore32

Consolidated Company-Sponsored Investment Funds (Tables)	6 Months Ended
	Jun. 30, 2017
Variable Interest Entity [Line Items]
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	Valuation of our financial instruments by pricing observability levels as of June 30, 2017 and December 31, 2016 was as follows (in thousands): Level 1 Level 2 Level 3 NAV Expedient (1) Other Total June 30, 2017: Money markets $ 173,176 $ — $ — $ — $ — $ 173,176 Securities segregated (U.S. Treasury Bills) — 1,007,079 — — — 1,007,079 Derivatives 813 7,063 — — — 7,876 Investments Trading U.S. Treasury Bills — 27,764 — — — 27,764 Equity securities 204,418 4,006 114 65 — 208,603 Fixed income securities 78,328 11,365 — 13 — 89,706 Long exchange-traded options 8,348 — — — — 8,348 Limited partnership hedge funds (2) — — — — 38,679 38,679 Private equity — — 4,914 39,938 — 44,852 Time deposits (3) — — — — 50,429 50,429 Other Available-for-sale 102 — — — — 102 Other investments (2)(4) — — — — 11,498 11,498 Total investments 291,196 43,135 5,028 40,016 100,606 479,981 Total assets measured at fair value $ 465,185 $ 1,057,277 $ 5,028 $ 40,016 $ 100,606 $ 1,668,112 Securities sold not yet purchased Short equities – corporate $ 15,042 $ — $ — $ — $ — $ 15,042 Short exchange-traded options 7,510 — — — — 7,510 Derivatives 916 7,260 — — — 8,176 Contingent payment arrangements — — 16,777 — — 16,777 Total liabilities measured at fair value $ 23,468 $ 7,260 $ 16,777 $ — $ — $ 47,505 December 31, 2016: Money markets $ 107,250 $ — $ — $ — $ — $ 107,250 Securities segregated (U.S. Treasury Bills) — 893,189 — — — 893,189 Derivatives 1,224 7,189 — — — 8,413 Investments Trading U.S. Treasury Bills — 28,937 — — — 28,937 Equity securities 148,128 5,724 110 36 — 153,998 Fixed income securities 80,473 11,107 — 12 — 91,592 Long exchange-traded options 3,106 — — — — 3,106 Limited partnership hedge funds (2) — — — — 40,530 40,530 Private equity — — 4,913 40,365 — 45,278 Time deposits (3) — — — — 70,097 70,097 Other Available-for-sale 45 — — — — 45 Other investments (2)(4) — — — — 7,522 7,522 Total investments 231,752 45,768 5,023 40,413 118,149 441,105 Total assets measured at fair value $ 340,226 $ 946,146 $ 5,023 $ 40,413 $ 118,149 $ 1,449,957 Securities sold not yet purchased Short equities – corporate $ 40,252 $ — $ — $ — $ — $ 40,252 Short exchange-traded options 692 — — — — 692 Derivatives 1,092 7,557 — — — 8,649 Contingent payment arrangements — — 17,589 — — 17,589 Total liabilities measured at fair value $ 42,036 $ 7,557 $ 17,589 $ — $ — $ 67,182 (1) Investments measured at fair value using NAV (or its equivalent) as a practical expedient. (2) Investments in equity method investees that are not measured at fair value in accordance with GAAP. (3) Investments carried at amortized cost that are not measured at fair value in accordance with GAAP. (4) Investments carried at cost that are not measured at fair value in accordance with GAAP.
Schedule of Change in Carrying Value Level 3 Financial Instruments	The change in carrying value associated with Level 3 financial instruments carried at fair value, classified as private equity and trading equity securities, is as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 5,026 $ 6,605 $ 5,023 $ 16,148 Reclassification (see below) — — — (9,532 ) Purchases — — — — Sales — — — — Realized gains (losses), net — — — — Unrealized gains (losses), net 2 (1,667 ) 5 (1,678 ) Balance as of end of period $ 5,028 $ 4,938 $ 5,028 $ 4,938
Schedule of Offsetting of Derivative Assets	Offsetting of assets as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount (in thousands) June 30, 2017: Securities borrowed $ 55,323 $ — $ 55,323 $ (52,150 ) $ — $ 3,173 Derivatives $ 7,876 $ — $ 7,876 $ — $ — $ 7,876 Long exchange-traded options $ 8,348 $ — $ 8,348 $ — $ — $ 8,348 December 31, 2016: Securities borrowed $ 82,814 $ — $ 82,814 $ (80,277 ) $ — $ 2,537 Derivatives $ 8,413 $ — $ 8,413 $ — $ (810 ) $ 7,603 Long exchange-traded options $ 3,106 $ — $ 3,106 $ — $ — $ 3,106
Schedule of Offsetting of Derivative Liabilities	Offsetting of liabilities as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Cash Collateral Pledged Net Amount (in thousands) June 30, 2017: Securities loaned $ 28,750 $ — $ 28,750 $ (28,616 ) $ — $ 134 Derivatives $ 8,176 $ — $ 8,176 $ — $ (5,564 ) $ 2,612 Short exchange-traded options $ 7,510 $ — $ 7,510 $ — $ — $ 7,510 December 31, 2016: Securities loaned $ — $ — $ — $ — $ — $ — Derivatives $ 8,649 $ — $ 8,649 $ — $ (6,239 ) $ 2,410 Short exchange-traded options $ 692 $ — $ 692 $ — $ — $ 692
Company-sponsored investment funds
Variable Interest Entity [Line Items]
Balances of Consolidated VIEs and VOEs included in Statement of Financial Condition	The balances of consolidated VIEs and VOEs included in our condensed consolidated statements of financial condition were as follows: June 30, 2017 December 31, 2016 (in thousands) VIEs VOEs Total VIEs VOEs Total Cash and cash equivalents $ 364,738 $ 39 $ 364,777 $ 337,525 $ — $ 337,525 Investments 629,680 29,656 659,336 550,850 23,226 574,076 Other assets 6,044 913 6,957 44,570 — 44,570 Total assets $ 1,000,462 $ 30,608 $ 1,031,070 $ 932,945 $ 23,226 $ 956,171 Liabilities $ 416,194 $ 9,853 $ 426,047 $ 292,800 $ — $ 292,800 Redeemable non-controlling interest 335,440 — 335,440 384,294 — 384,294 Partners' capital attributable to AB Unitholders 212,660 20,755 233,415 221,229 23,226 244,455 Non-redeemable non-controlling interests in consolidated entities 36,168 — 36,168 34,622 — 34,622 Total liabilities, redeemable non-controlling interest and partners' capital $ 1,000,462 $ 30,608 $ 1,031,070 $ 932,945 $ 23,226 $ 956,171
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis	Valuation of consolidated company-sponsored investment funds' financial instruments by pricing observability levels as of June 30, 2017 and December 31, 2016 was as follows (in thousands): Level 1 Level 2 Level 3 NAV Expedient Total June 30, 2017: Investments - VIEs $ 526,097 $ 100,725 $ 2,777 $ 81 $ 629,680 Investments - VOEs 12,757 16,879 20 — 29,656 Derivatives - VIEs 70 1,487 — — 1,557 Derivatives - VOEs 1 9 — — 10 Total assets measured at fair value $ 538,925 $ 119,100 $ 2,797 $ 81 $ 660,903 Short equities - VIEs $ 406,811 $ — $ — $ — $ 406,811 Derivatives - VIEs 30 2,823 — — 2,853 Derivatives - VOEs — 9 — — 9 Total liabilities measured at fair value $ 406,841 $ 2,832 $ — $ — $ 409,673 December 31, 2016: Investments - VIEs $ 341,830 $ 203,197 $ 5,741 $ 82 $ 550,850 Investments - VOEs 10,188 12,061 — 977 23,226 Derivatives - VIEs 58 1,739 — — 1,797 Total assets measured at fair value $ 352,076 $ 216,997 $ 5,741 $ 1,059 $ 575,873 Short equities - VIEs $ 248,419 $ — $ — $ — $ 248,419 Derivatives - VIEs 48 2,033 — — 2,081 Total liabilities measured at fair value $ 248,467 $ 2,033 $ — $ — $ 250,500
Schedule of Change in Carrying Value Level 3 Financial Instruments	The change in carrying value associated with Level 3 financial instruments carried at fair value within consolidated company-sponsored investment funds was as follows: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Balance as of beginning of period $ 10,273 $ 15,426 $ 5,741 $ — Impact of adoption of ASU 2015-02 — — — 14,740 Deconsolidated funds (6,697 ) — (6,697 ) — Transfers in (out) (336 ) (1,315 ) 413 (1,315 ) Purchases 435 350 5,012 356 Sales (824 ) (455 ) (1,897 ) (508 ) Realized (losses), net 8 (39 ) (4 ) (39 ) Unrealized gains (losses), net (54 ) (838 ) 217 (123 ) Accrued discounts (8 ) (21 ) 12 (3 ) Balance as of end of period $ 2,797 $ 13,108 $ 2,797 $ 13,108
Schedule of Offsetting of Derivative Assets	Offsetting of derivative assets of consolidated company-sponsored investment funds as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets Presented in the Statement of Financial Position Financial Instruments Collateral Received Net Amount (in thousands) June 30, 2017: Derivatives - VIEs $ 14,422 $ — $ 14,422 $ — $ (88 ) $ 14,334 Derivatives - VOEs $ 10 $ — $ 10 $ — $ — $ 10 December 31, 2016: Derivatives - VIEs $ 4,997 $ — $ 4,997 $ — $ (461 ) $ 4,536
Schedule of Offsetting of Derivative Liabilities	Offsetting of derivative liabilities of consolidated company-sponsored investment funds as of June 30, 2017 and December 31, 2016 was as follows: Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities Presented in the Statement of Financial Position Financial Instruments Collateral Pledged Net Amount (in thousands) June 30, 2017: Derivatives - VIEs $ 2,853 $ — $ 2,853 $ — $ (2,853 ) $ — Derivatives - VOEs $ 9 $ — $ 9 $ — $ (1 ) $ 8 December 31, 2016: Derivatives - VIEs $ 2,081 $ — $ 2,081 $ — $ (2,081 ) $ —

Units Outstanding (Tables)

Units Outstanding (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Changes in AB Units Outstanding	Changes in AB Units outstanding during the six -month period ended June 30, 2017 were as follows: Outstanding as of December 31, 2016 268,893,534 Options exercised 545,458 Units issued 1,876,205 Units retired (1) (5,601,111 ) Balance as of June 30, 2017 265,714,086 (1) Includes 30,400 AB Units purchased in private transactions and retired during the first six months of 2017.

Changes in Capital (Tables)

Changes in Capital (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Summary of Changes in Capital	Changes in capital during the six -month period ended June 30, 2017 were as follows: Partners’ Capital Attributable to AB Unitholders Non-Controlling Interests In Consolidated Entities Total Capital (in thousands) Balance as of December 31, 2016 $ 4,032,017 $ 36,172 $ 4,068,189 Comprehensive income: Net income 275,040 9,610 284,650 Other comprehensive income, net of tax: Unrealized gains on investments 8 — 8 Foreign currency translation adjustments 15,407 949 16,356 Changes in employee benefit related items 456 — 456 Comprehensive income 290,911 10,559 301,470 Distributions to General Partner and unitholders (339,139 ) — (339,139 ) Compensation-related transactions (96,889 ) — (96,889 ) Capital contributions to affiliates (280 ) — (280 ) Purchase of non-controlling interest 173 (2,006 ) (1,833 ) Distributions to non-controlling interests of our consolidated venture capital fund — (7,868 ) (7,868 ) Other (679 ) — (679 ) Balance as of June 30, 2017 $ 3,886,114 $ 36,857 $ 3,922,971 Changes in capital during the six -month period ended June 30, 2016 were as follows: Partners’ Capital Attributable to AB Unitholders Non-Controlling Interests In Consolidated Entities Total Capital (in thousands) Balance as of December 31, 2015 $ 3,992,748 $ 24,473 $ 4,017,221 Comprehensive income: Net income (loss) 290,785 (6,953 ) 283,832 Other comprehensive income, net of tax: Unrealized (losses) on investments (13 ) — (13 ) Foreign currency translation adjustments 107 (5 ) 102 Changes in employee benefit related items (36 ) — (36 ) Comprehensive income 290,843 (6,958 ) 283,885 Distributions to General Partner and unitholders (275,930 ) — (275,930 ) Compensation-related transactions (76,983 ) — (76,983 ) Capital contributions from affiliates (120 ) — (120 ) Other (337 ) — (337 ) Balance as of June 30, 2016 $ 3,930,221 $ 17,515 $ 3,947,736

Non-controlling Interests (Tabl

Non-controlling Interests (Tables)	6 Months Ended
	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Non-controlling Interest in Net Income	Non-controlling interest in net income for the three and six months ended June 30, 2017 and 2016 consisted of the following: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (in thousands) Non-redeemable non-controlling interests: Consolidated company-sponsored investment funds $ 7,930 $ (150 ) $ 9,415 $ (7,153 ) Other 48 101 195 200 Total non-redeemable non-controlling interests 7,978 (49 ) 9,610 (6,953 ) Redeemable non-controlling interests: Consolidated company-sponsored investment funds 9,191 4,892 23,877 6,048 Total non-controlling interest in net income (loss) $ 17,169 $ 4,843 $ 33,487 $ (905 )
Non-redeemable Noncontrolling Interest	Non-redeemable non-controlling interest as of June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Consolidated company-sponsored investment funds $ 36,168 $ 34,622 Other 689 1,550 Total non-redeemable non-controlling interest $ 36,857 $ 36,172
Redeemable Noncontrolling Interest	Redeemable non-controlling interest as of June 30, 2017 and December 31, 2016 consisted of the following: June 30, 2017 December 31, 2016 (in thousands) Consolidated company-sponsored investment funds $ 335,440 $ 384,294 CPH Capital Fondsmaeglerselskab A/S acquisition 8,664 8,665 Total redeemable non-controlling interest $ 344,104 $ 392,959

Business Description Organiza36

Business Description Organization and Basis of Presentation (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2017shares	Jun. 30, 2017shares
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
AXA and its subsidiaries ownership interest in holding company (percent)	1.50%	1.50%
Limited partners or members ownership interest in company (percent)		100.00%
General partnership information [Abstract]
General Partnership number of general partnership units owned in Holding Company (in units)	100,000	100,000
General partnership interest in Company (percent)	1.00%	1.00%
AXA and its subsidiaries economic interest in Company (percent)		64.60%
AXA and its subsidiaries
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Limited partners or members ownership interest in company (percent)		64.00%
AB Holding
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Limited partners or members ownership interest in company (percent)		34.80%
Unaffiliated holders
Ownership structure of AllianceBernstein expressed as a percentage of general and limited partnership interests [Abstract]
Limited partners or members ownership interest in company (percent)		1.20%

Business Description Organiza37

Business Description Organization and Basis of Presentation (Revision) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes	$ 10,265	$ 13,231	$ 20,322	$ 25,737
Net income attributable to AB Unitholders	$ 135,103	$ 124,501	$ 275,040	$ 290,785
Basic net income per AB Unit (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06
Diluted net income per AB Unit (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes		$ 10,588		$ 20,452
Net income attributable to AB Unitholders		$ 127,144		$ 296,070
Basic net income per AB Unit (in dollars per unit)		$ 0.47		$ 1.08
Diluted net income per AB Unit (in dollars per unit)		$ 0.47		$ 1.08
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income taxes		$ 2,643		$ 5,285
Net income attributable to AB Unitholders		$ (2,643)		$ (5,285)
Basic net income per AB Unit (in dollars per unit)		$ (0.01)		$ (0.02)
Diluted net income per AB Unit (in dollars per unit)		$ (0.01)		$ (0.02)

Long-term Incentive Compensat38

Long-term Incentive Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
AB Holding Units purchased (in units)	4,300,000	1,900,000	5,700,000	3,800,000
Amount paid for AB Holding Units acquired	$ 96,700	$ 44,300	$ 127,800	$ 84,000
Open-market purchases of AB Holding Units (in units)	3,700,000	1,900,000	4,900,000	3,700,000
Amount paid for open-market purchases of AB Holding Units	$ 82,400	$ 43,900	$ 110,300	$ 82,000
Restricted AB Holding Units awarded to employees (in units)			2,000,000	300,000
Units issued upon exercise of options (in units)			545,458	100,000
Proceeds from stock options exercised			$ 9,246	$ 2,377

Cash Distributions (Details)

Cash Distributions (Details) - $ / shares	Jul. 27, 2017	Jun. 30, 2017	Jun. 30, 2017
Distribution Made to Limited Partner [Line Items]
General partnership interest in Company (percent)		1.00%	1.00%
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution declared (in dollars per unit)	$ 0.56
Cash Distribution
Distribution Made to Limited Partner [Line Items]
Declaration date			Jul. 27, 2017
General partnership interest in Company (percent)		1.00%
Distribution date			Aug. 24, 2017
Date of record			Aug. 7, 2017

Real Estate Charges (Details)

Real Estate Charges (Details) $ in Thousands, ft² in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)ft²	Dec. 31, 2016USD ($)
Restructuring and Related Activities [Abstract]
Square feet of office space sub-leased | ft²	1
Real estate liability restructuring reserve [Abstract]
Balance as of beginning of period	$ 112,932	$ 123,912
Expense (credit) incurred	15,940	12,248
Deferred rent	3,601	4,930
Payments made	(20,861)	(32,988)
Interest accretion	2,074	4,830
Balance as of end of period	$ 113,686	$ 112,932

Net Income per Unit (Details)

Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Unit [Abstract]
General partnership interest in Company (percent)	1.00%		1.00%
Limited Partners interest in Company (as a percent)			99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 135,103	$ 124,501	$ 275,040	$ 290,785
Weighted average units outstanding – basic (in units)	268,302,000	269,720,000	268,391,000	270,787,000
Dilutive effect of compensatory options to buy AB Holding Units (in units)	430,000	650,000	482,000	534,000
Weighted average units outstanding – diluted (in units)	268,732,000	270,370,000	268,873,000	271,321,000
Basic net income per AB Unit (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06
Diluted net income per AB Unit (in dollars per unit)	$ 0.50	$ 0.46	$ 1.01	$ 1.06
Options excluded from diluted net income per unit computation due to their anti-dilutive effect (in units)	2,507,179	2,793,454	2,452,633	2,873,106

Cash and Securities Segregate42

Cash and Securities Segregated Under Federal Regulations and Other Requirements (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Brokers and Dealers [Abstract]
United States Treasury Bills in special reserve bank custody account for exclusive benefit of brokerage customers of SCB LLC	$ 1,000	$ 900
Restricted funds held for benefit of customers by AllianceBernstein Investments, Inc.	$ 70.6	$ 52.9

Investments (Summary of Investm

Investments (Summary of Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Summary of Investment Holdings [Line Items]
Investments owned	$ 479,981	$ 441,105
Long-term incentive compensation obligations	62,585	67,761
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	465,900	500,000
Private equity (seed capital)
Summary of Investment Holdings [Line Items]
Investments owned	44,852	45,278
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	50,429	70,097
Trading | U.S. Treasury Bills
Summary of Investment Holdings [Line Items]
Investments owned	27,764	28,937
Trading | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	49,189	50,935
Trading | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	166,739	188,053
Trading | Equities
Summary of Investment Holdings [Line Items]
Investments owned	82,381	6,602
Trading | Exchange-traded options
Summary of Investment Holdings [Line Items]
Investments owned	8,348	3,106
Investments in limited partnership hedge funds | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	13,396	16,826
Investments in limited partnership hedge funds | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	25,283	23,704
Other
Summary of Investment Holdings [Line Items]
Investments owned	$ 11,600	$ 7,567

Investments (Gains (Losses) Rel

Investments (Gains (Losses) Related to Trading Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Net gains recognized during the period	$ 2,505	$ 7,394	$ 16,265	$ 8,626
Less: net gains (losses) recognized during the period on trading securities sold during the period	11,616	(2,335)	12,539	(12,696)
Unrealized (losses) gains recognized during the period on trading securities held	$ (9,111)	$ 9,729	$ 3,726	$ 21,322

Derivative Instruments (Notiona

Derivative Instruments (Notional Value and Fair Value of Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Notional Value	$ 419,437	$ 459,743
Asset Derivatives	7,876	8,413
Liability Derivatives	8,176	8,649
Exchange-traded futures
Derivative [Line Items]
Notional Value	98,938	103,108
Asset Derivatives	813	1,224
Liability Derivatives	916	1,092
Currency forwards
Derivative [Line Items]
Notional Value	190,292	180,820
Asset Derivatives	5,666	4,541
Liability Derivatives	5,156	4,711
Interest rate swaps
Derivative [Line Items]
Notional Value	34,038	40,664
Asset Derivatives	898	940
Liability Derivatives	970	897
Credit default swaps
Derivative [Line Items]
Notional Value	32,399	45,108
Asset Derivatives	423	1,205
Liability Derivatives	1,015	905
Total return swaps
Derivative [Line Items]
Notional Value	63,770	90,043
Asset Derivatives	76	503
Liability Derivatives	$ 119	$ 1,044

Derivative Instruments (Gains a

Derivative Instruments (Gains and Losses for Derivative Instruments Recognized in Investment Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Net (losses) on derivative instruments	$ (5,387)	$ (5,052)	$ (14,879)	$ (8,609)
Exchange-traded futures
Derivative [Line Items]
Net (losses) on derivative instruments	(3,301)	(913)	(8,833)	2,433
Currency forwards
Derivative [Line Items]
Net (losses) on derivative instruments	132	(685)	(930)	(1,820)
Interest rate swaps
Derivative [Line Items]
Net (losses) on derivative instruments	(151)	(559)	(248)	(1,931)
Credit default swaps
Derivative [Line Items]
Net (losses) on derivative instruments	(237)	(198)	(909)	(606)
Option swaps
Derivative [Line Items]
Net (losses) on derivative instruments	0	39	0	87
Total return swaps
Derivative [Line Items]
Net (losses) on derivative instruments	$ (1,830)	$ (2,736)	$ (3,959)	$ (6,772)

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Cash collateral payable to trade counterparties	$ 0		$ 0		$ 800,000
Cash collateral received	5,600,000		5,600,000		6,200,000
Loss on equity options activity	5,400,000	$ 8,100,000	9,200,000	$ 16,700,000
Exchange-traded options | Long
Derivative [Line Items]
Cash collateral payable to trade counterparties	0		0		0
Long exchange-traded equity options, classified as trading investments	8,300,000		8,300,000		3,100,000
Exchange-traded options | Short
Derivative [Line Items]
Cash collateral received	0		0		0
Short exchange-traded equity options, included in securities sold not yet purchased	$ 7,500,000		$ 7,500,000		$ 700,000

Offsetting Assets and Liabili48

Offsetting Assets and Liabilities (Offsetting Assets) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Derivative Asset [Abstract]
Cash Collateral Received	$ 0	$ (800,000)
Securities borrowed
Securities Borrowed [Abstract]
Gross Amounts of Recognized Assets	55,323,000	82,814,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	55,323,000	82,814,000
Financial Instruments	(52,150,000)	(80,277,000)
Cash Collateral Received	0	0
Net Amount	3,173,000	2,537,000
Derivatives
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	7,876,000	8,413,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	7,876,000	8,413,000
Financial Instruments	0	0
Cash Collateral Received	0	(810,000)
Net Amount	7,876,000	7,603,000
Exchange-traded options | Long
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	8,348,000	3,106,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	8,348,000	3,106,000
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	$ 8,348,000	$ 3,106,000

Offsetting Assets and Liabili49

Offsetting Assets and Liabilities (Offsetting Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative Liability [Abstract]
Cash Collateral Pledged	$ (5,600)	$ (6,200)
Securities loaned
Securities Loaned [Abstract]
Gross Amounts of Recognized Liabilities	28,750	0
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	28,750	0
Financial Instruments	(28,616)	0
Cash Collateral Pledged	0	0
Net Amount	134	0
Derivatives
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities	8,176	8,649
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	8,176	8,649
Financial Instruments	0	0
Cash Collateral Pledged	(5,564)	(6,239)
Net Amount	2,612	2,410
Exchange-traded options | Short
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities	7,510	692
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	7,510	692
Financial Instruments	0	0
Cash Collateral Pledged	0	0
Net Amount	$ 7,510	$ 692

Fair Value (Valuation of Financ

Fair Value (Valuation of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, NAV Expedient	$ 39,900
Investments, Other Measurements	100,606	$ 118,149
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	173,176	107,250
Securities segregated (U.S. Treasury Bills)	1,007,079	893,189
Derivatives	7,876	8,413
Private equity	44,852	45,278
Investments, NAV Expedient	40,016	40,413
Available-for-sale	102	45
Total investments measured at fair value and other measurements	479,981	441,105
Total assets measured at fair value and other measurements	1,668,112	1,449,957
Securities sold not yet purchased
Short equities – corporate	15,042	40,252
Short exchange-traded options	7,510	692
Derivatives	8,176	8,649
Contingent payment arrangements	16,777	17,589
Total liabilities measured at fair value	47,505	67,182
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	173,176	107,250
Securities segregated (U.S. Treasury Bills)	0	0
Derivatives	813	1,224
Private equity	0	0
Available-for-sale	102	45
Total investments	291,196	231,752
Total assets measured at fair value	465,185	340,226
Securities sold not yet purchased
Short equities – corporate	15,042	40,252
Short exchange-traded options	7,510	692
Derivatives	916	1,092
Contingent payment arrangements	0	0
Total liabilities measured at fair value	23,468	42,036
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	0	0
Securities segregated (U.S. Treasury Bills)	1,007,079	893,189
Derivatives	7,063	7,189
Private equity	0	0
Available-for-sale	0	0
Total investments	43,135	45,768
Total assets measured at fair value	1,057,277	946,146
Securities sold not yet purchased
Short equities – corporate	0	0
Short exchange-traded options	0	0
Derivatives	7,260	7,557
Contingent payment arrangements	0	0
Total liabilities measured at fair value	7,260	7,557
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	0	0
Securities segregated (U.S. Treasury Bills)	0	0
Derivatives	0	0
Private equity	4,914	4,913
Available-for-sale	0	0
Total investments	5,028	5,023
Total assets measured at fair value	5,028	5,023
Securities sold not yet purchased
Short equities – corporate	0	0
Short exchange-traded options	0	0
Derivatives	0	0
Contingent payment arrangements	16,777	17,589
Total liabilities measured at fair value	16,777	17,589
U.S. Treasury Bills | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	27,764	28,937
U.S. Treasury Bills | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	0
U.S. Treasury Bills | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	27,764	28,937
U.S. Treasury Bills | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	0
Equity securities | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	208,603	153,998
Investments, NAV Expedient	65	36
Equity securities | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	204,418	148,128
Equity securities | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	4,006	5,724
Equity securities | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	114	110
Fixed income securities | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	89,706	91,592
Investments, NAV Expedient	13	12
Fixed income securities | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	78,328	80,473
Fixed income securities | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	11,365	11,107
Fixed income securities | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	0
Private equity | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, NAV Expedient	39,938	40,365
Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	11,498	7,522
Other investments | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	11,498	7,522
Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	50,429	70,097
Time deposits | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	50,429	70,097
Long | Exchange-traded options | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	8,348	3,106
Long | Exchange-traded options | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	8,348	3,106
Long | Exchange-traded options | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	0
Long | Exchange-traded options | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	0	0
Limited partnership hedge funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	38,679	40,530
Limited partnership hedge funds | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Other Measurements	$ 38,679	$ 40,530

Fair Value (Details)

Fair Value (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)acquisition	Dec. 31, 2016USD ($)acquisition
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments, Measurements Other than Fair Value	$ 100,606	$ 118,149
Investments, NAV Expedient	39,900
Assets measured at fair value for impairment on a nonrecurring basis	0	0
Liabilities measured at fair value for impairment on a nonrecurring basis	$ 0	$ 0
Contingent Payment Arrangements
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Number of acquisitions | acquisition	3	3
Private Equity Investment Energy Fund
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 4,900	$ 4,900
Recurring
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments, NAV Expedient	40,016	40,413
Contingent payment arrangements	16,777	17,589
Recurring | Contingent Payment Arrangements
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent payment arrangements	$ 16,800	17,600
Weighted Average | Contingent Payment Arrangements
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
AUM growth rate	18.00%
Minimum | Contingent Payment Arrangements
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue growth rate	4.00%
Discount rate	1.40%
Maximum | Contingent Payment Arrangements
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Revenue growth rate	31.00%
Discount rate	6.40%
Level 3 | Recurring
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investments	$ 5,028	5,023
Contingent payment arrangements	16,777	$ 17,589
Private equity
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Unfunded commitment	$ 800

Fair Value (Change in Carrying

Fair Value (Change in Carrying Value of Level 3 Financial Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair value measurement Level 3 reconciliation [Abstract]
Balance as of beginning of period	$ 5,026	$ 6,605	$ 5,023	$ 16,148
Reclassification	0	0	0	(9,532)
Purchases	0	0	0	0
Sales	0	0	0	0
Realized gains (losses), net	0	0	0	0
Unrealized gains (losses), net	2	(1,667)	5	(1,678)
Balance as of end of period	$ 5,028	$ 4,938	$ 5,028	$ 4,938

Fair Value (Change in Carryin53

Fair Value (Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Liabilities Measurement Level 3 reconciliation
Balance as of beginning of period	$ 17,177	$ 31,119	$ 17,589	$ 31,399
Accretion	177	353	355	706
Payments	(577)	(611)	(1,167)	(1,244)
Balance as of end of period	$ 16,777	$ 30,861	$ 16,777	$ 30,861

Consolidated Company-Sponsore54

Consolidated Company-Sponsored Investment Funds (Summary of Balance Sheet Amounts) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 963,168	$ 994,510	$ 725,639	$ 577,300
Other assets	266,286	195,615
Total assets	9,067,912	8,740,448
Liabilities	4,800,837	4,279,300
Redeemable non-controlling interest	344,104	392,959
Partners' capital attributable to AB Unitholders	3,886,114	4,032,017
Non-redeemable non-controlling interests in consolidated entities	36,857	36,172
Total liabilities, redeemable non-controlling interest and capital	9,067,912	8,740,448
Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	364,777	337,525
Investments	659,336	574,076
Other assets	6,957	44,570
Liabilities	426,047	292,800
Redeemable non-controlling interest	335,440	384,294
Non-redeemable non-controlling interests in consolidated entities	36,168	34,622
Reportable entities | Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	364,777	337,525
Investments	659,336	574,076
Other assets	6,957	44,570
Total assets	1,031,070	956,171
Liabilities	426,047	292,800
Redeemable non-controlling interest	335,440	384,294
Partners' capital attributable to AB Unitholders	233,415	244,455
Non-redeemable non-controlling interests in consolidated entities	36,168	34,622
Total liabilities, redeemable non-controlling interest and capital	1,031,070	956,171
Reportable entities | VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	364,738	337,525
Investments	629,680	550,850
Other assets	6,044	44,570
Total assets	1,000,462	932,945
Liabilities	416,194	292,800
Redeemable non-controlling interest	335,440	384,294
Partners' capital attributable to AB Unitholders	212,660	221,229
Non-redeemable non-controlling interests in consolidated entities	36,168	34,622
Total liabilities, redeemable non-controlling interest and capital	1,000,462	932,945
Reportable entities | VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	39	0
Investments	29,656	23,226
Other assets	913	0
Total assets	30,608	23,226
Liabilities	9,853	0
Redeemable non-controlling interest	0	0
Partners' capital attributable to AB Unitholders	20,755	23,226
Non-redeemable non-controlling interests in consolidated entities	0	0
Total liabilities, redeemable non-controlling interest and capital	$ 30,608	$ 23,226

Consolidated Company-Sponsore55

Consolidated Company-Sponsored Investment Funds (Fair Value) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, NAV Expedient	$ 39,900
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	7,876	$ 8,413
Investments, NAV Expedient	40,016	40,413
Short equities	15,042	40,252
Derivatives	8,176	8,649
Total liabilities measured at fair value	47,505	67,182
Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	291,196	231,752
Derivatives	813	1,224
Total assets measured at fair value	465,185	340,226
Short equities	15,042	40,252
Derivatives	916	1,092
Total liabilities measured at fair value	23,468	42,036
Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	43,135	45,768
Derivatives	7,063	7,189
Total assets measured at fair value	1,057,277	946,146
Short equities	0	0
Derivatives	7,260	7,557
Total liabilities measured at fair value	7,260	7,557
Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	5,028	5,023
Derivatives	0	0
Total assets measured at fair value	5,028	5,023
Short equities	0	0
Derivatives	0	0
Total liabilities measured at fair value	16,777	17,589
Company-sponsored investment funds | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, NAV Expedient	81	1,059
Total assets measured at fair value	660,903	575,873
Total liabilities measured at fair value	409,673	250,500
Company-sponsored investment funds | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	538,925	352,076
Total liabilities measured at fair value	406,841	248,467
Company-sponsored investment funds | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	119,100	216,997
Total liabilities measured at fair value	2,832	2,033
Company-sponsored investment funds | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets measured at fair value	2,797	5,741
Total liabilities measured at fair value	0	0
VIEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	14,422	4,997
Derivatives	2,853	2,081
VIEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	629,680	550,850
Derivatives	1,557	1,797
Investments, NAV Expedient	81	82
Derivatives	2,853	2,081
VIEs | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	526,097	341,830
Derivatives	70	58
Derivatives	30	48
VIEs | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	100,725	203,197
Derivatives	1,487	1,739
Derivatives	2,823	2,033
VIEs | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	2,777	5,741
Derivatives	0	0
Derivatives	0	0
VIEs | Short | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short equities	406,811	248,419
VIEs | Short | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short equities	406,811	248,419
VIEs | Short | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short equities	0	0
VIEs | Short | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short equities	0	0
VOEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	10
Derivatives	9
VOEs | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	29,656	23,226
Derivatives	10
Investments, NAV Expedient		977
Derivatives	9
VOEs | Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	12,757	10,188
Derivatives	1
Derivatives	0
VOEs | Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	16,879	12,061
Derivatives	9
Derivatives	9
VOEs | Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	20	$ 0
Derivatives	0
Derivatives	$ 0

Consolidated Company-Sponsore56

Consolidated Company-Sponsored Investment Funds (Change in Carrying Value Associated with Level 3 Financial Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair value measurement Level 3 reconciliation [Abstract]
Balance as of beginning of period	$ 5,026	$ 6,605	$ 5,023	$ 16,148
Transfers in (out)	0	0	0	(9,532)
Purchases	0	0	0	0
Sales	0	0	0	0
Realized (losses), net	0	0	0	0
Unrealized gains (losses), net	2	(1,667)	5	(1,678)
Balance as of end of period	5,028	4,938	5,028	4,938
Company-sponsored investment funds
Fair value measurement Level 3 reconciliation [Abstract]
Balance as of beginning of period	10,273	15,426	5,741	0
Impact of adoption of ASU 2015-02	0	0	0	14,740
Deconsolidated funds	(6,697)	0	(6,697)	0
Transfers in (out)	(336)	(1,315)	413	(1,315)
Purchases	435	350	5,012	356
Sales	(824)	(455)	(1,897)	(508)
Realized (losses), net	8	(39)	(4)	(39)
Unrealized gains (losses), net	(54)	(838)	217	(123)
Accrued discounts	(8)	(21)	12	(3)
Balance as of end of period	$ 2,797	$ 13,108	$ 2,797	$ 13,108

Consolidated Company-Sponsore57

Consolidated Company-Sponsored Investment Funds (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivative [Line Items]
Gain (loss) on derivative instruments	$ (5,387,000)	$ (5,052,000)	$ (14,879,000)	$ (8,609,000)
Cash collateral payable to trade counterparties	0		0		$ 800,000
Cash collateral received	5,600,000		5,600,000		6,200,000
Net assets of investment products that are non-consolidated VIEs	49,400,000,000		49,400,000,000
Maximum risk of loss in investment in VIEs	19,500,000		19,500,000
VIEs
Derivative [Line Items]
Futures, forwards and swaps held	11,600,000		11,600,000		2,900,000
Asset Derivatives	12,900,000		12,900,000		3,200,000
Gain (loss) on derivative instruments	7,800,000	$ (300,000)	15,000,000	$ 2,700,000
Cash collateral payable to trade counterparties	88,000		88,000		461,000
Cash collateral received	3,800,000		3,800,000		$ 3,300,000
VOEs
Derivative [Line Items]
Cash collateral payable to trade counterparties	$ 0		$ 0

Consolidated Company-Sponsore58

Consolidated Company-Sponsored Investment Funds (Offsetting of Derivative Assets and Liabilities) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Derivative Asset [Abstract]
Cash Collateral Received	$ 0	$ (800,000)
VIEs
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	14,422,000	4,997,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Assets Presented in the Statement of Financial Position	14,422,000	4,997,000
Financial Instruments	0	0
Cash Collateral Received	(88,000)	(461,000)
Net Amount	14,334,000	4,536,000
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities	2,853,000	2,081,000
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	2,853,000	2,081,000
Financial Instruments	0	0
Collateral Pledged	(2,853,000)	(2,081,000)
Net Amount	0	$ 0
VOEs
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets	10,000
Gross Amounts Offset in the Statement of Financial Position	0
Net Amounts of Assets Presented in the Statement of Financial Position	10,000
Financial Instruments	0
Cash Collateral Received	0
Net Amount	10,000
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities	9,000
Gross Amounts Offset in the Statement of Financial Position	0
Net Amounts of Liabilities Presented in the Statement of Financial Position	9,000
Financial Instruments	0
Collateral Pledged	(1,000)
Net Amount	$ 8,000

Units Outstanding (Details)

Units Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Units Outstanding
Outstanding as of December 31, 2016 (in units)	268,893,534
Options exercised (in units)	545,458	100,000
Units issued (in units)	1,876,205
Units retired (in units)	(5,601,111)
Balance as of June 30, 2017 (in units)	265,714,086
Limited Partners' Capital Account [Line Items]
Units purchased and retired (in units)	5,601,111
AB Units
Units Outstanding
Units retired (in units)	(30,400)
Limited Partners' Capital Account [Line Items]
Units purchased and retired (in units)	30,400

Debt (Details)

Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Short-term Debt [Line Items]
Short-term debt outstanding	$ 512,437,000	$ 512,970,000
Commercial Paper
Short-term Debt [Line Items]
Short-term debt outstanding	$ 482,400,000	$ 513,000,000
Weighted average interest rate	1.30%	0.90%
Average daily borrowings	$ 557,300,000	$ 422,900,000
Weighted average interest rates on average daily borrowings	1.00%	0.60%
Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 200,000,000
Term of debt instrument	364 days
Amounts outstanding under credit facility	$ 30,000,000	$ 0
Weighted average interest rate	2.20%
Average daily borrowings	$ 22,400,000	$ 7,300,000
Weighted average interest rate	1.80%	1.60%

Changes in Capital (Details)

Changes in Capital (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in capital [Roll Forward]
Partners' capital, beginning balance			$ 4,032,017
Partners' capital attributable to non-controlling interest, beginning balance			36,172
Partner's capital including portion attributable to non-controlling interest, beginning balance			4,068,189
Comprehensive income:
Net income	$ 152,272	$ 129,344	308,527	$ 289,880
Other comprehensive income, net of tax:
Foreign currency translation adjustments	7,489	(5,123)	16,356	102
Changes in employee benefit related items	267	397	456	(36)
Comprehensive income attributable to AB Unitholders	142,012	119,824	290,911	290,843
Distributions to General Partner and unitholders			(339,139)	(275,930)
Partners' capital, ending balance	3,886,114		3,886,114
Partners' capital attributable to non-controlling interest, ending balance	36,857		36,857
Partner's capital including portion attributable to non-controlling interest, ending balance	3,922,971		3,922,971
Partners’ Capital Attributable to AB Unitholders
Changes in capital [Roll Forward]
Partners' capital, beginning balance			4,032,017	3,992,748
Comprehensive income:
Net income			275,040	290,785
Other comprehensive income, net of tax:
Unrealized gains (losses) on investments			8	(13)
Foreign currency translation adjustments			15,407	107
Changes in employee benefit related items			456	(36)
Comprehensive income attributable to AB Unitholders			290,911	290,843
Distributions to General Partner and unitholders			(339,139)	(275,930)
Compensation-related transactions			(96,889)	(76,983)
Capital contributions to affiliates			(280)	(120)
Purchase of non-controlling interest			173
Distributions to non-controlling interests of our consolidated venture capital fund			0
Other			679	(337)
Partners' capital, ending balance	3,886,114	3,930,221	3,886,114	3,930,221
Non-Controlling Interests In Consolidated Entities
Changes in capital [Roll Forward]
Partners' capital attributable to non-controlling interest, beginning balance			36,172	24,473
Comprehensive income:
Net income attributable to noncontrolling interest			9,610	(6,953)
Other comprehensive income, net of tax:
Unrealized gains (losses) on investments			0	0
Foreign currency translation adjustments			949	(5)
Changes in employee benefit related items			0	0
Comprehensive income attributable to non-controlling interest			10,559	(6,958)
Distributions to General Partner and unitholders			0	0
Compensation-related transactions			0	0
Capital contributions to affiliates			0	0
Purchase of non-controlling interest			(2,006)
Distributions to non-controlling interests of our consolidated venture capital fund			(7,869)
Other			0	0
Partners' capital attributable to non-controlling interest, ending balance	36,857	17,515	36,857	17,515
Total Capital
Changes in capital [Roll Forward]
Partner's capital including portion attributable to non-controlling interest, beginning balance			4,068,189	4,017,221
Comprehensive income:
Net income			284,650	283,832
Other comprehensive income, net of tax:
Unrealized gains (losses) on investments			8	(13)
Foreign currency translation adjustments			16,356	102
Changes in employee benefit related items			456	(36)
Comprehensive income			301,470	283,885
Distributions to General Partner and unitholders			(339,139)	(275,930)
Compensation-related transactions			(96,889)	(76,983)
Capital contributions to affiliates			(280)	(120)
Purchase of non-controlling interest			(1,833)
Distributions to non-controlling interests of our consolidated venture capital fund			(7,868)
Other			679	(337)
Partner's capital including portion attributable to non-controlling interest, ending balance	$ 3,922,971	3,947,736	$ 3,922,971	3,947,736
Adjustment
Other comprehensive income, net of tax:
Partners' capital, ending balance		$ (43,000)		$ (43,000)

Non-controlling Interests (Deta

Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	$ 7,978	$ (49)	$ 9,610	$ (6,953)
Total non-controlling interest in net income (loss)	17,169	4,843	33,487	(905)
Non-redeemable non-controlling interest	36,857		36,857		$ 36,172
Redeemable non-controlling interest	344,104		344,104		392,959
CPH acquisition
Noncontrolling Interest [Line Items]
Redeemable non-controlling interest	8,664		8,664		8,665
Other
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	48	101	195	200
Non-redeemable non-controlling interest	689		689		1,550
Company-sponsored investment funds
Noncontrolling Interest [Line Items]
Non-redeemable non-controlling interests	7,930	(150)	9,415	(7,153)
Redeemable non-controlling interests	9,191	$ 4,892	23,877	$ 6,048
Non-redeemable non-controlling interest	36,168		36,168		34,622
Redeemable non-controlling interest	$ 335,440		$ 335,440		$ 384,294