Cohen & Steers (CNS) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2017	Aug. 01, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	COHEN & STEERS INC
Entity Central Index Key	1,284,812
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large 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		46,303,257

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents		$ 178,414	$ 183,234
Trading investments ($598 and $487), ($66,417 and $6,987)	[1],[2]	73,556	12,689
Equity method investments		5,892	6,459
Available-for-sale investments		28,257	35,396
Accounts receivable		50,635	46,288
Due from brokers ($12,989 and $475)	[1]	14,452	1,579
Property and equipment—net		15,471	15,964
Goodwill and intangible assets—net		19,866	19,118
Deferred income tax assets—net		4,450	5,619
Other assets ($832 and $43)	[1]	6,890	7,382
Total assets		397,883	333,728
Liabilities:
Accrued compensation		19,038	35,333
Distribution and service fees payable		7,089	6,452
Income tax payable		8,583	9,375
Due to brokers ($577 and $12)	[1]	11,835	0
Deferred rent		6,113	6,229
Other liabilities and accrued expenses ($56 and $55)	[1]	9,753	9,672
Total liabilities		62,411	67,061
Commitments and contingencies
Redeemable noncontrolling interest		45,419	853
Stockholders’ equity:
Common stock, $0.01 par value; 500,000,000 shares authorized; 51,088,099 and 50,415,152 shares issued at June 30, 2017 and December 31, 2016, respectively		511	504
Additional paid-in capital		556,383	543,829
Accumulated deficit		(108,581)	(127,957)
Accumulated other comprehensive loss, net of tax		(4,511)	(5,885)
Less: Treasury stock, at cost, 4,787,883 and 4,524,694 shares at June 30, 2017 and December 31, 2016, respectively		(153,749)	(144,677)
Total stockholders’ equity		290,053	265,814
Total liabilities and stockholders’ equity		$ 397,883	$ 333,728
[1]	Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2017 and December 31, 2016 attributable to Cohen & Steers SICAV Global Listed Infrastructure Fund, Cohen & Steers SICAV Global Preferred Securities Fund and Cohen & Steers Co-Investment Partnership, L.P., which were variable interest entities as of June 30, 2017 and December 31, 2016, respectively.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Common Stock, par value		$ 0.01	$ 0.01
Common Stock, shares authorized		500,000,000	500,000,000
Common Stock, shares issued		51,088,099	50,415,152
Treasury Stock, shares		4,787,883	4,524,694
Trading investments	[1],[2]	$ 73,556	$ 12,689
Due from broker	[1]	14,452	1,579
Other Assets	[1]	6,890	7,382
Due to broker	[1]	11,835	0
Other liabilities and accrued expenses	[1]	9,753	9,672
Trading investments
Trading investments and pledged as collateral	[2]	598	487
GLI SICAV, GRP-CIP and SICAV Preferred [Member]
Trading investments		66,417	6,987
Due from broker		12,989	475
Other Assets		832	43
Due to broker		11,835	0
Other liabilities and accrued expenses		$ 121	$ 75
[1]	Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2017 and December 31, 2016 attributable to Cohen & Steers SICAV Global Listed Infrastructure Fund, Cohen & Steers SICAV Global Preferred Securities Fund and Cohen & Steers Co-Investment Partnership, L.P., which were variable interest entities as of June 30, 2017 and December 31, 2016, respectively.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Investment advisory and administration fees		$ 84,893	$ 79,090	$ 166,796	$ 152,178
Distribution and service fees		5,104	4,671	10,150	8,904
Portfolio consulting and other		2,815	2,612	5,552	4,972
Total revenue		92,812	86,373	182,498	166,054
Expenses:
Employee compensation and benefits		30,412	28,287	59,795	56,327
Distribution and service fees		10,157	9,773	19,937	18,475
General and administrative		13,059	12,489	25,989	25,224
Depreciation and amortization		1,827	1,693	3,892	3,590
Total expenses		55,455	52,242	109,613	103,616
Operating income		37,357	34,131	72,885	62,438
Non-operating income:
Interest and dividend income—net		786	558	1,285	1,100
Gain (loss) from trading investments—net	[1]	2	1,017	275	810
Equity in earnings (losses) of affiliates		(279)	2,640	(568)	3,067
Gain (loss) from available-for-sale investments—net		83	158	118	128
Other gains (losses)—net		(331)	93	(622)	4
Total non-operating income (loss)		261	4,466	488	5,109
Income before provision for income taxes		37,618	38,597	73,373	67,547
Provision for income taxes		14,620	13,676	27,431	24,759
Net income		22,998	24,921	45,942	42,788
Less: Net (income) loss attributable to redeemable noncontrolling interest		476	(113)	517	103
Net income attributable to common stockholders		$ 23,474	$ 24,808	$ 46,459	$ 42,891
Earnings per share attributable to common stockholders:
Basic (in dollars per share)		$ 0.51	$ 0.54	$ 1	$ 0.93
Diluted (in dollars per share)		0.50	0.53	0.99	0.93
Dividends declared per share (in dollars per share)		$ 0.28	$ 0.26	$ 0.56	$ 0.52
Weighted average shares outstanding:
Basic (shares)		46,373	45,984	46,308	45,896
Diluted (shares)		46,902	46,378	46,753	46,287
[1]	Includes net income (loss) attributable to redeemable noncontrolling interest for the periods presented.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - 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	$ 22,998	$ 24,921	$ 45,942	$ 42,788
Less: Net (income) loss attributable to redeemable noncontrolling interest	476	(113)	517	103
Net income attributable to common stockholders	23,474	24,808	46,459	42,891
Other comprehensive income, net of tax:
Foreign currency translation gain (loss)	887	(1,317)	1,374	(945)
Net unrealized gain (loss) from available-for-sale investments (net of tax of $0)	(296)	1,374	118	2,161
Reclassification to statements of operations of (gain) loss from available-for-sale investments	(83)	(158)	(118)	(128)
Other comprehensive income (loss)	508	(101)	1,374	1,088
Total comprehensive income attributable to common stockholders	$ 23,982	$ 24,707	$ 47,833	$ 43,979

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common stocks	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss), Net of Tax	Treasury Stock	Total Stockholders' Equity	Redeemable Noncontrolling Interest
Beginning balance at Dec. 31, 2015		$ 497	$ 519,855	$ (148,096)	$ (3,843)	$ (136,637)	$ 231,776
Beginning balance (redeemable noncontrolling interest) at Dec. 31, 2015								$ 11,334
Beginning balance (shares of common stock, net) at Dec. 31, 2015		45,440
Dividends				(24,467)			(24,467)
Issuance of common stock		$ 7	446				453
Issuance of common stock, shares		704
Repurchase of common stock						(7,937)	(7,937)
Repurchase of common stock, shares		(272)
Tax benefits associated with restricted stock units—net			(1,301)				(1,301)
Issuance of restricted stock units			780				780
Amortization of restricted stock units—net			11,949				11,949
Forfeitures of restricted stock units			(29)				(29)
Net income (loss)	$ 42,788			42,891			42,891	(103)
Other comprehensive income (loss), net of tax	1,088				1,088		1,088
Contributions from redeemable noncontrolling interest	(3,877)							3,877
Distributions to redeemable noncontrolling interest								(181)
Transfer of redeemable noncontrolling interest in consolidated entity								(14,036)
Ending balance at Jun. 30, 2016		$ 504	531,700	(129,672)	(2,755)	(144,574)	255,203
Ending balance (redeemable noncontrolling interest) at Jun. 30, 2016								891
Ending balance (shares of common stock, net) at Jun. 30, 2016		45,872
Beginning balance at Dec. 31, 2016	265,814	$ 504	543,829	(127,957)	(5,885)	(144,677)	265,814
Beginning balance (redeemable noncontrolling interest) at Dec. 31, 2016								853
Beginning balance (shares of common stock, net) at Dec. 31, 2016		45,890
Dividends				(26,798)			(26,798)
Issuance of common stock		$ 7	467				474
Issuance of common stock, shares		673
Repurchase of common stock						(9,072)	(9,072)
Repurchase of common stock, shares		(263)
Issuance of restricted stock units			1,156				1,156
Amortization of restricted stock units—net			11,002	(285)			10,717
Forfeitures of restricted stock units			(71)				(71)
Net income (loss)	45,942			46,459			46,459	(517)
Other comprehensive income (loss), net of tax	1,374				1,374		1,374
Contributions from redeemable noncontrolling interest	(45,132)							45,132
Distributions to redeemable noncontrolling interest								(49)
Ending balance at Jun. 30, 2017	$ 290,053	$ 511	$ 556,383	$ (108,581)	$ (4,511)	$ (153,749)	$ 290,053
Ending balance (redeemable noncontrolling interest) at Jun. 30, 2017								$ 45,419
Ending balance (shares of common stock, net) at Jun. 30, 2017		46,300

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income		$ 45,942	$ 42,788
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock compensation expense		10,717	11,992
Depreciation and amortization		3,892	3,590
Deferred rent		(116)	(15)
(Gain) loss from trading investments—net	[1]	(275)	(810)
Equity in (earnings) losses of affiliates		568	(3,067)
(Gain) loss from available-for-sale investments—net		(118)	(128)
Deferred income taxes		1,143	2,561
Foreign currency (gain) loss		(96)	(1,238)
Changes in operating assets and liabilities:
Accounts receivable		(4,251)	(1,884)
Due from broker		(12,873)	(1,605)
Deferred commissions		(952)	(2,120)
Trading investments		(60,592)	(3,498)
Other assets		(226)	(642)
Accrued compensation		(16,268)	(15,212)
Distribution and services fee payable		637	(127)
Due to broker		11,835	1,798
Income tax payable		(792)	(1,460)
Other liabilities and accrued expenses		269	(235)
Net cash provided by (used in) operating activities		(21,556)	30,688
Cash flows from investing activities:
Proceeds from redemptions of equity method investments—net		0	208
Purchases of available-for-sale investments		(12,552)	(4,017)
Proceeds from sales of available-for-sale investments		19,822	5,378
Purchases of property and equipment		(1,552)	(5,233)
Net cash provided by (used in) investing activities		5,718	(3,664)
Cash flows from financing activities:
Issuance of common stock		403	385
Repurchase of common stock		(9,072)	(7,937)
Dividends to stockholders		(25,960)	(23,920)
Distributions to redeemable noncontrolling interest		(49)	(181)
Contributions from redeemable noncontrolling interest		45,132	3,877
Net cash provided by (used in) financing activities		10,454	(27,776)
Net increase (decrease) in cash and cash equivalents		(5,384)	(752)
Effect of foreign exchange rate changes on cash and cash equivalents		564	(1,292)
Cash and cash equivalents, beginning of the period		183,234	$ 142,728
Cash and cash equivalents, end of the period		$ 178,414
[1]	Includes net income (loss) attributable to redeemable noncontrolling interest for the periods presented.

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Income taxes paid, net	$ (27,190)	$ (23,612)
Fully vested restricted stock units issued	318	234
Restricted stock unit dividend equivalents, net of forfeitures	838	$ 546
LPX
Transfer of redeemable noncontrolling interest in consolidated entity	14,036
Non-cash increase in equity method investments	14,550
MLO
Equity Method Investments, Non-Cash Reclassifications	$ 12,995

Organization and Description of

Organization and Description of Business	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Cohen & Steers, Inc. (CNS) was organized as a Delaware corporation on March 17, 2004. CNS is the holding company for its direct and indirect subsidiaries, including Cohen & Steers Capital Management, Inc. (CSCM), Cohen & Steers Securities, LLC (CSS), Cohen & Steers Asia Limited (CSAL), Cohen & Steers UK Limited (CSUK) and Cohen & Steers Japan, LLC (collectively, the Company). The Company is a global investment manager specializing in liquid real assets, including real estate securities, listed infrastructure, commodities and natural resource equities, as well as preferred securities and other income solutions. Founded in 1986, the Company is headquartered in New York City, with offices in London, Hong Kong, Tokyo and Seattle.

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The condensed consolidated financial statements set forth herein include the accounts of CNS and its direct and indirect subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated financial statements of the Company included herein are unaudited and have been prepared in accordance with the instructions to Form 10-Q pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary for a fair presentation of the interim results have been made. The Company’s condensed consolidated financial statements and the related notes should be read together with the consolidated financial statements and the related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . Recently Adopted Accounting Pronouncements —In March 2016, the Financial Accounting Standards Board (FASB) issued new guidance amending the current accounting for an investment that becomes qualified for the equity method of accounting. The guidance requires that the cost of acquiring an additional interest in the investment, if any, that resulted in it qualifying for the equity method be added to the carrying value of the investment. The equity method will then be applied from that point forward without any retroactive application or adjustment. This new guidance was effective for the Company’s first quarter of 2017. The adoption of this new guidance did not have a material impact on its condensed consolidated financial statements and related disclosures. In March 2016, the FASB issued new guidance which simplifies several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, excess tax benefits, forfeitures and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted this guidance on January 1, 2017. As a result, the Company reclassified $285,000 from additional paid-in capital to retained earnings on January 1, 2017. Prospectively beginning January 1, 2017, excess tax benefits or tax deficiencies are now reflected in the condensed consolidated statements of operations as a component of the provision for income taxes. For the six months ended June 30, 2017, the Company recognized $54,000 of excess tax benefits. Additionally, the condensed consolidated statements of cash flows now reflects excess tax benefits from share-based payments as an operating activity, rather than a financing activity. Finally, the Company elected to account for forfeitures as they occur, rather than estimate expected forfeitures. Accounting Estimates —The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Management believes the estimates used in preparing the condensed consolidated financial statements are reasonable and prudent. Actual results could differ from those estimates. Consolidation of Company-sponsored Funds —Investments in Company-sponsored funds and management fees are evaluated at inception and thereafter, if there is a reconsideration event, in order to determine whether to apply the Variable Interest Entity (VIE) model or the Voting Interest Entity (VOE) model. In performing this analysis, all of the Company’s management fees are presumed to be commensurate and at market and are therefore not considered variable interests. A VIE is an entity in which either (a) the equity investment at risk is not sufficient to permit the entity to finance its own activities without additional financial support or (b) the group of holders of the equity investment at risk lack certain characteristics of a controlling financial interest. The primary beneficiary is the entity that has (a) the power to direct the activities of the VIE that most significantly affect its performance and (b) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. Investments and redemptions or amendments to the governing documents of the respective entities could affect an entity’s status as a VIE or the determination of the primary beneficiary. The Company assesses whether it is the primary beneficiary of any VIEs identified by evaluating its economic interests in the entity held either directly by the Company and its affiliates or indirectly through employees. VIEs for which the Company is deemed to be the primary beneficiary are consolidated. Investments in Company-sponsored funds that are determined to be VOEs are consolidated when the Company’s ownership interest is greater than 50% of the outstanding voting interests of the fund or when the Company is the general partner of the fund and the limited partners do not have substantive kick-out or participating rights in the fund. The Company records noncontrolling interests in consolidated subsidiaries for which the Company’s ownership is less than 100 %. See Note 4 for further discussion about the Company’s seed investments. Cash and Cash Equivalents —Cash equivalents consist of short-term, highly liquid investments, which are readily convertible into cash and have original maturities of three months or less. Due from/to Brokers —The Company conducts business, primarily with respect to its consolidated seed investments, with brokers for certain of its investment activities. The clearing and custody operations for these investment activities are performed pursuant to contractual agreements. The due from/to brokers balance represents cash and cash equivalents balances at brokers/custodians and/or receivables and payables for unsettled securities transactions. Investments —Management of the Company determines the appropriate classification of its investments at the time of purchase and re-evaluates such determination at each statement of financial condition date. Investments classified as trading represent securities held within the affiliated funds that the Company consolidates and are measured at fair value based on quoted market prices, market prices obtained from independent pricing services engaged by management or as determined by management and approved by the Company’s valuation committee. Unrealized gains and losses are recorded as gain (loss) from trading investments—net in the Company’s condensed consolidated statements of operations. Investments classified as equity method investments represent seed investments in which the Company owns between 20 - 50% of the outstanding voting interests in the affiliated fund or when it is determined that the Company is able to exercise significant influence but not control over the investments. When using the equity method, the Company recognizes its respective share of the affiliated investee fund net income or loss for the period which is recorded as equity in earnings (losses) of affiliates in the Company’s condensed consolidated statements of operations. As of June 30, 2017 , the Company’s equity method investments consisted of interests in affiliated funds which measure their underlying investments at fair value based on quoted market prices or NAV (or its equivalent) as a practical expedient and report a net asset value on a recurring basis. The carrying amounts of these investments approximate their fair value. Investments classified as available-for-sale are comprised of equity securities, fixed income securities, investment-grade preferred instruments and investments in Company-sponsored open-end funds where the Company has neither control nor the ability to exercise significant influence. These investments are carried at fair value based on quoted market prices or market prices obtained from independent pricing services engaged by management, with unrealized gains and losses, net of tax, reported in accumulated other comprehensive income. The Company periodically reviews each individual security position that has an unrealized loss, or impairment, to determine if that impairment is other-than-temporary. If the Company believes an impairment of a security position is other-than-temporary, based on available quantitative and qualitative information as of the report date, the loss will be recognized as gain (loss) from available-for-sale investments—net in the Company’s condensed consolidated statements of operations. From time to time, the affiliated funds consolidated by the Company enter into derivative contracts to gain exposure to the underlying commodities markets or to hedge market and credit risks of the underlying portfolios utilizing options, total return swaps, credit default swaps and futures contracts. These instruments are measured at fair value based on their settlement price at the close of trading on the associated commodities exchange or board of trade with gains and losses recorded as gain (loss) from trading investments—net in the Company’s condensed consolidated statements of operations. The fair values of these instruments are recorded in other assets or other liabilities and accrued expenses on the Company’s condensed consolidated statements of financial condition. As of June 30, 2017 , none of the outstanding derivative contracts were subject to a master netting agreement or other similar arrangement. Additionally, from time to time, the Company enters into foreign exchange contracts to hedge its currency exposure related to certain client receivables. These instruments are measured at fair value with gains and losses recorded in other non-operating income (loss) in the Company’s condensed consolidated statements of operations. The fair values of these contracts are recorded in other assets or other liabilities and accrued expenses on the Company’s condensed consolidated statements of financial condition. Goodwill and Intangible Assets —Goodwill represents the excess of the cost of the Company’s investment in the net assets of an acquired company over the fair value of the underlying identifiable net assets at the date of acquisition. Goodwill and indefinite lived intangible assets are not amortized but are tested at least annually for impairment by comparing the fair value to their carrying amounts. Finite lived intangible assets are amortized over their useful lives and are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. See Note 3 for further discussion about the Company’s goodwill and intangible assets. Redeemable Noncontrolling Interest —Redeemable noncontrolling interest represents third-party interests in the Company’s consolidated entities. This interest is redeemable at the option of the investors and therefore is not treated as permanent equity. Redeemable noncontrolling interest is remeasured at redemption value which approximates the fair value at each reporting period. Investment Advisory and Administration Fees —The Company earns revenue by providing asset management services to institutional accounts and to Company-sponsored open-end and closed-end funds. Investment advisory fees are earned pursuant to the terms of investment management agreements and are based on a contractual fee rate applied to the assets in the portfolio. The Company also earns administration fees from certain Company-sponsored open-end and closed-end funds pursuant to the terms of underlying administration contracts. Administration fees are based on the average assets under management of such funds. Investment advisory and administration fee revenue is recognized as such fees are earned. Distribution and Service Fee Revenue —Distribution and service fee revenue is based on the average daily net assets of certain share classes of the Company’s sponsored open-end funds distributed by CSS. Distribution and service fee revenue is earned daily and is recorded gross of any third-party distribution and service fee expense for applicable share classes. Distribution and Service Fee Expense —Distribution and service fee expense includes distribution fees, shareholder servicing fees and intermediary assistance payments. Distribution and service fee expense is recorded as incurred. Distribution fee expense represents payments made to qualified intermediaries for (i) assistance in connection with the distribution of the Company’s sponsored open-end funds’ shares and (ii) for other expenses such as advertising costs and printing and distribution of prospectuses to investors. Such amounts may also be used to pay financial intermediaries for services as specified in the terms of written agreements complying with Rule 12b-1 of the Investment Company Act of 1940 (Rule 12b-1). The Company pays distribution fee expense based on the average daily net assets under management of certain share classes of the funds. Shareholder servicing fee expense represents payments made to qualified intermediaries for shareholder account service and maintenance. These services are provided pursuant to written agreements with such qualified institutions. Intermediary assistance payments represent payments to qualified intermediaries for activities related to distribution, shareholder servicing and marketing and support of Company-sponsored open-end funds and are incremental to those described above. Intermediary assistance payments are generally based on the average assets under management or the number of accounts being serviced. Portfolio Consulting and Other —The Company earns portfolio consulting and other fees by (i) providing portfolio consulting services in connection with model-based strategy accounts; (ii) earning a licensing fee for the use of the Company’s proprietary indexes; and (iii) providing portfolio monitoring services related to a number of unit investment trusts. This revenue is earned pursuant to the terms of the underlying contract, and the fee schedules for these relationships vary based on the type of services the Company provides for each relationship. This revenue is recognized as such fees are earned. Stock-based Compensation —The Company recognizes compensation expense for the grant-date fair value of awards of equity instruments to employees. This expense is recognized over the period during which employees are required to provide service. Forfeitures are recorded as incurred. Income Taxes —The Company records the current and deferred tax consequences of all transactions that have been recognized on its condensed consolidated financial statements in accordance with the provisions of the enacted tax laws. Deferred tax assets are recognized for temporary differences that will result in deductible amounts in future years at tax rates that are expected to apply in those years. Deferred tax liabilities are recognized for temporary differences that will result in taxable income in future years at tax rates that are expected to apply in those years. The Company records a valuation allowance, when necessary, to reduce deferred tax assets to an amount that more likely than not will be realized. The effective tax rate for interim periods represents the Company’s best estimate of the effective tax rate expected to be applied to the full fiscal year. The calculation of the tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across the Company’s global operations. A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits. Currency Translation and Transactions —Assets and liabilities of subsidiaries having non-U.S. dollar functional currencies are translated at exchange rates at the applicable condensed consolidated statement of financial condition date. Revenue and expenses of such subsidiaries are translated at average exchange rates during the period. The gains or losses resulting from translating non-U.S. dollar functional currency into U.S. dollars are included in the Company’s condensed consolidated statements of comprehensive income. The cumulative translation adjustment was $(5,471,000) and $(6,845,000) as of June 30, 2017 and December 31, 2016 , respectively. Gains or losses resulting from non-U.S. dollar currency transactions are included in other non-operating income (loss) in the condensed consolidated statements of operations. Comprehensive Income —The Company reports all changes in comprehensive income on the condensed consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common stockholders, as well as the net of tax amounts attributable to foreign currency translation gain (loss), unrealized gain (loss) from available-for-sale investments and reclassification of realized gain (loss) from available-for-sale investments to the statements of operations. Recently Issued Accounting Pronouncements —In May 2017, the FASB issued new guidance for modification accounting related to share-based payment transactions in order to provide clarity and to reduce current diversity in practice. The amendments in this new guidance do not fundamentally change the notion of a modification. Instead, the amendments clarify which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments will be effective for the Company’s first quarter of 2018 and must be applied prospectively to any awards modified on or after the adoption date. The Company does not expect the adoption of the new standard to have a material effect on its consolidated financial statements and related disclosures. In January 2017, the FASB issued guidance to simplify the goodwill impairment test by removing the requirement to perform 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. This new guidance will be effective for the Company’s first quarter of 2020. The Company is currently evaluating the potential effect of this new guidance on its condensed consolidated financial statements and related disclosures. In August 2016, the FASB amended the current guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to unify the currently diverse presentations and classifications, which address eight classification issues related to the statement of cash flows, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This amended guidance will be effective for the Company’s first quarter of 2018 and requires a retrospective approach to adoption. The Company is currently evaluating the potential effect of this revised guidance on its condensed consolidated financial statements and related disclosures. In February 2016, the FASB issued guidance introducing a new lease model which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. The new standard establishes a right-of-use model (ROU) that requires a lessee to recognize an ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The new guidance also requires disclosures by lessees and lessors to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new guidance is effective on January 1, 2019, with early adoption permitted. The Company expects to adopt the new standard on its effective date. A modified retrospective transition approach is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. While the Company is continuing to assess the effect of adoption, it currently believes the most significant change relates to the recognition of new ROU assets and lease liabilities on its condensed consolidated statements of financial condition for its office space and other operating leases. The Company does not expect a significant change in its leasing activity between now and adoption. The Company is still assessing which of the available practical expedients it plans on electing upon adoption. In January 2016, the FASB issued new guidance amending the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. This new guidance will be effective for the Company’s first quarter of 2018 and will require a cumulative-effect adjustment to beginning retained earnings as of the date of adoption. Upon adoption of this guidance, changes in the fair value of the Company’s available-for-sale equity investments will be reported through earnings rather than through other comprehensive income. Using values as of June 30, 2017, the cumulative-effect adjustment to beginning retained earnings would result in a reclassification of net unrealized gains from other comprehensive income to retained earnings in the amount of $930,000 , net of tax. Additionally, if the Company had applied the new guidance for the three months ended June 30, 2017, $606,000 of net unrealized losses recorded in other comprehensive income would have been recorded in non-operating income (loss) in the Company’s condensed consolidated statement of operations. In May 2014, the FASB issued new guidance which outlined a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued revised guidance which clarifies the guidance related to (a) determining the appropriate unit of account under the revenue standard’s principal versus agent guidance and (b) applying the indicators of whether an entity is a principal or an agent in accordance with the revenue standard’s control principle. In April 2016, the FASB issued an amendment to provide more detailed guidance including additional implementation guidance and examples related to (a) identifying performance obligations and (b) licenses of intellectual property. In May 2016, the FASB amended the standard to clarify the guidance on assessing collectibility, presenting sales taxes, measuring noncash consideration, and certain transition matters. This new guidance will be effective for the Company’s first quarter of 2018 and requires either a retrospective or a modified retrospective approach to adoption. The Company has not yet determined which transition method will be employed upon adoption, though it has reached conclusions on key accounting assessments related to the new guidance, including identification of performance obligations, and evaluation of existing contracts and revenue streams for potential changes in the amount and timing of revenue recognition. The Company is still finalizing its assessment and quantifying the impacts related to accounting for costs incurred to obtain a contract, presentation of certain costs presented on either a gross or net basis, as well as implementing changes to its systems, processes and internal controls to meet the new guidance’s reporting and disclosure requirements.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill Goodwill represents the excess of purchase price over the net tangible assets and identifiable intangible assets of an acquired business. At June 30, 2017 and December 31, 2016 , goodwill was approximately $18,476,000 and $17,684,000 , respectively. The Company’s goodwill increased by $792,000 for the six months ended June 30, 2017 as a result of foreign currency revaluation. Intangible Assets The following table details the gross carrying amounts and accumulated amortization of the intangible assets at June 30, 2017 and December 31, 2016 (in thousands): Remaining Amortization Period (in months) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net June 30, 2017: Amortized intangible assets: Client relationships 18 $ 1,543 $ (1,403 ) $ 140 Non-amortized intangible assets: Mutual fund management contracts — 1,250 — 1,250 Total $ 2,793 $ (1,403 ) $ 1,390 December 31, 2016: Amortized intangible assets: Client relationships 24 $ 1,543 $ (1,359 ) $ 184 Non-amortized intangible assets: Mutual fund management contracts — 1,250 — 1,250 Total $ 2,793 $ (1,359 ) $ 1,434 Amortization expense related to the intangible assets was approximately $22,000 for both the three months ended June 30, 2017 and 2016 , and approximately $44,000 for both the six months ended June 30, 2017 and 2016 . Remaining future amortization expense is as follows (in thousands): Periods Ending December 31, Remaining Amortization Expense 2017 $ 45 2018 95 Total $ 140

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Investments [Abstract]
Investments	Investments The following is a summary of the Company’s seed investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, December 31, 2016 Trading investments $ 73,556 $ 12,689 Equity method investments 5,892 6,459 Available-for-sale investments 28,257 35,396 Gain (loss) from seed investments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Gain (loss) from trading investments—net (1) $ 2 $ 1,017 $ 275 $ 810 Equity in earnings (losses) of affiliates (279 ) 2,640 (568 ) 3,067 Gain (loss) from available-for-sale investments—net 83 158 118 128 Net gain (loss) from seed investments $ (194 ) $ 3,815 $ (175 ) $ 4,005 Number of new funds seeded 1 — 2 — _________________________ (1) Includes net income (loss) attributable to redeemable noncontrolling interest for the periods presented. Voting Interest Entities The Cohen & Steers Funds ICAV (ICAV), an Irish alternative investment fund (AIF), and the Cohen & Steers Active Commodities Fund (Commodities Sub-Fund), a sub-fund within the ICAV, were launched by the Company in January 2017, and meet the definition of an investment company. The Company is the investment adviser of the Commodities Sub-Fund for which it receives a management fee. The ICAV and the Commodities Sub-Fund are each a VOE and the Company’s ownership interest in the ICAV is less than 20%; therefore, the Company records its investment in the Commodities Sub-Fund as an available-for-sale investment. The Cohen & Steers Low Duration Preferred and Income Fund, Inc. (LPX), launched by the Company in December 2015, is an open-end fund for which the Company is the investment adviser. LPX is a VOE and the Company owned the majority of the outstanding voting interests through February 29, 2016. Accordingly, the underlying assets and liabilities and results of operations of LPX had been included in the Company’s consolidated financial statements with the third-party interests classified as redeemable noncontrolling interest. As a result of additional third-party subscriptions into the fund, effective March 1, 2016, the Company no longer owned the majority of the outstanding voting interest in LPX; however, it was determined that the Company had significant influence over the financial decisions of LPX and therefore recorded its investment in LPX using the equity method of accounting. Effective October 1, 2016, the Company’s ownership interest in LPX fell below 20% and the Company no longer had significant influence over LPX. Accordingly, the Company began recording its investment in LPX as an available-for-sale investment until the second quarter of 2017, when the Company sold its remaining interest in LPX. The Cohen & Steers Active Commodities Strategy Fund, Inc. (CDF), launched by the Company in May 2014, is an open-end fund for which the Company is the investment adviser. CDF is a VOE and the Company owned the majority of the outstanding voting interests in the fund as of June 30, 2017 . Accordingly, the underlying assets and liabilities and results of operations of CDF have been included in the Company’s condensed consolidated financial statements with the third-party interests classified as redeemable noncontrolling interest. The Cohen & Steers Active Commodities Fund, LP (ACOM), launched by the Company in April 2013, is structured as a partnership. The Company is the investment adviser of ACOM for which it is entitled to receive a management fee. The limited partners of ACOM, unaffiliated with the Company, have the ability to liquidate the fund with a majority vote. As a result, the Company does not have financial control and ACOM is a VOE. The Company’s equity interest in ACOM represents a seed investment to launch the fund, adjusted for the Company’s proportionate share of the fund’s earnings. As of June 30, 2017 , the Company’s ownership in ACOM was approximately 10% ; however, as the general partner, the Company has significant influence over the financial decisions of ACOM and therefore records its investment in ACOM using the equity method of accounting. The Cohen & Steers MLP & Energy Opportunity Fund, Inc. (MLO), launched by the Company in December 2013, is an open-end fund for which the Company is the investment adviser. MLO is a VOE. Effective November 1, 2014, as a result of its ownership interest, it was determined that the Company had significant influence over the financial decisions of MLO and therefore recorded its investment in MLO using the equity method of accounting. Effective June 1, 2016, the Company’s ownership interest in MLO fell below 20% and the Company no longer had significant influence over MLO. Accordingly, the Company began recording its investment in MLO as an available-for-sale investment. Cohen & Steers Real Assets Fund, Inc. (RAP), launched by the Company in January 2012, is an open-end fund for which the Company is the investment adviser. RAP is a VOE. The Company recorded its investment in RAP as an available-for-sale investment until the fourth quarter of 2016 when the Company sold its remaining interest in RAP. Variable Interest Entities The Cohen & Steers SICAV Global Preferred Securities Fund (SICAV Preferred), a Luxembourg-domiciled undertaking for collective investments in transferable securities (UCITS), was launched by the Company in May 2017 and meets the definition of an investment company. The Company is the investment adviser of SICAV Preferred for which it receives a management fee. SICAV Preferred is a VIE and the Company is the primary beneficiary. As of June 30, 2017 , the Company’s ownership interest in SICAV Preferred was approximately 26% . Accordingly, the underlying assets and liabilities and results of operations of SICAV Preferred have been included in the Company’s condensed consolidated financial statements with the third-party interests classified as redeemable noncontrolling interest. The Cohen & Steers SICAV Global Listed Infrastructure Fund (GLI SICAV), a Luxembourg-domiciled UCITS, was launched by the Company in September 2015 and meets the definition of an investment company. The Company is the investment adviser of GLI SICAV for which it receives a management fee. GLI SICAV is a VIE and the Company is the primary beneficiary. As of June 30, 2017 , the Company was the only investor in the fund and therefore, the Company would absorb all of the expected losses and residual returns of GLI SICAV. Accordingly, the underlying assets and liabilities and results of operations of GLI SICAV have been included in the Company’s condensed consolidated financial statements. Cohen & Steers Global Realty Partners III-TE, L.P. (GRP-TE), which had its closing in October 2011, is structured as a partnership. The Company is the general partner and investment adviser of GRP-TE, for which it receives a management fee and is entitled to receive an incentive distribution, if earned. GRP-TE is a VIE and the Company is not the primary beneficiary. The Company’s equity interest in GRP-TE represents a seed investment to launch the fund, adjusted for the Company’s proportionate share of the fund’s earnings. As of June 30, 2017 , the Company’s ownership in GRP-TE was approximately 0.2% ; however, as the general partner, the Company has significant influence over the financial decisions of GRP-TE and therefore records its investment using the equity method of accounting. The Company’s risk with respect to its investment in GRP-TE is limited to its equity ownership and any uncollected management fees. In conjunction with the launch of GRP-TE, the Company established Cohen & Steers Co-Investment Partnership, L.P. (GRP-CIP), which is used by the Company to fulfill its contractual commitment to co-invest with GRP-TE. See Note 11 for further discussion regarding the Company’s co-investment commitment. GRP-CIP is a VIE and the Company is the primary beneficiary as it owns all of the voting interest in GRP-CIP. Accordingly, the underlying assets and liabilities and results of operations of GRP-CIP have been included in the Company’s condensed consolidated financial statements. The following represents the portion of the condensed consolidated statements of financial condition attributable to the consolidated VIEs as of June 30, 2017 and December 31, 2016 . The assets may only be used to settle obligations of each VIE and the liabilities are the sole obligation of each VIE, for which creditors do not have recourse to the general credit of the Company (in thousands): June 30, 2017 December 31, 2016 GLI SICAV GRP-CIP SICAV Preferred Total GLI SICAV GRP-CIP Total Assets: Trading investments $ 5,684 $ 2,234 $ 58,499 $ 66,417 $ 5,069 $ 1,918 $ 6,987 Due from broker 209 198 12,582 12,989 181 294 475 Other assets 44 — 788 832 43 — 43 Total assets $ 5,937 $ 2,432 $ 71,869 $ 80,238 $ 5,293 $ 2,212 $ 7,505 Liabilities: Due to broker $ 59 $ — $ 11,776 $ 11,835 $ — $ — $ — Other liabilities and accrued expenses 46 5 70 121 70 5 75 Total liabilities $ 105 $ 5 $ 11,846 $ 11,956 $ 70 $ 5 $ 75 The following is a summary of the fair value of trading investments and equity method investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 December 31, 2016 Trading Investments Equity Method Investments Trading Investments Equity Method Investments Voting Interest Entities ACOM $ — $ 5,795 $ — $ 6,371 CDF 7,139 — 5,702 — Variable Interest Entities GLI SICAV 5,684 — 5,069 — GRP-CIP 2,234 — 1,918 — GRP-TE — 97 — 88 SICAV Preferred 58,499 — — — Total $ 73,556 $ 5,892 $ 12,689 $ 6,459 Gain (loss) from trading investments—net for the three and six months ended June 30, 2017 and 2016, which represent realized and unrealized gains and losses recorded by the funds the Company consolidates, are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Voting Interest Entities CDF $ (420 ) $ 879 $ (845 ) $ 979 LPX — — — (769 ) Variable Interest Entities GLI SICAV 173 183 574 575 GRP-CIP (109 ) (45 ) 188 25 SICAV Preferred 358 — 358 — Total gain (loss) from trading investments—net $ 2 $ 1,017 $ 275 $ 810 Equity in earnings (losses) of affiliates for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Voting Interest Entities ACOM $ (274 ) $ 791 $ (576 ) $ 867 LPX — 228 — 474 MLO — 1,618 — 1,737 Variable Interest Entities GRP-TE (5 ) 3 8 (11 ) Total equity in earnings (losses) of affiliates $ (279 ) $ 2,640 $ (568 ) $ 3,067 The following is a summary of the cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Cost Gross Unrealized Gains Gross Unrealized Losses (1) Fair Value Common stocks $ 8,654 $ 489 $ (276 ) $ 8,867 Company-sponsored funds 13,376 1,265 (24 ) 14,617 Fixed income securities 3,627 17 (24 ) 3,620 Preferred securities 993 47 — 1,040 Other 100 13 — 113 Total available-for-sale investments $ 26,750 $ 1,831 $ (324 ) $ 28,257 _________________________ (1) At June 30, 2017 , there were no securities with material unrealized losses continuously for a period of more than 12 months. December 31, 2016 Cost Gross Unrealized Gains Gross (1) Fair Value Common stocks $ 4,639 $ 194 $ (325 ) $ 4,508 Company-sponsored funds 28,232 1,755 (110 ) 29,877 Preferred securities 1,020 13 (22 ) 1,011 Total available-for-sale investments $ 33,891 $ 1,962 $ (457 ) $ 35,396 _________________________ (1) At December 31, 2016 , there were no securities with unrealized losses continuously for a period of more than 12 months. Available-for-sale investments with a fair value of approximately $5,545,000 and $18,521,000 at June 30, 2017 and December 31, 2016 , respectively, were in an unrealized loss position. Unrealized losses on available-for-sale investments as of June 30, 2017 were generally caused by changes in market conditions. When evaluating whether an unrealized loss on an available-for-sale investment is other than temporary, the Company reviews such factors as the extent and duration of the loss, as well as quantitative and qualitative information about the financial condition and near term prospects of the funds. As of June 30, 2017 , the Company determined that it had the ability and intent to hold the remaining available-for-sale investments for which no other-than-temporary impairment has occurred until a recovery of fair value. Accordingly, impairment of these investments is considered temporary. Sales proceeds, gross realized gains and losses from available-for-sale investments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds from sales $ 13,024 $ 3,464 $ 19,910 $ 5,419 Gross realized gains 216 321 314 471 Gross realized losses (133 ) (163 ) (196 ) (343 )

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Accounting Standards Codification Topic 820, Fair Value Measurement (ASC 820) specifies a hierarchy of valuation classifications based on whether the inputs to the valuation techniques used in each valuation classification are observable or unobservable. These classifications are summarized in the three broad levels listed below: • Level 1—Unadjusted quoted prices for identical instruments in active markets. • Level 2—Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable. • Level 3—Valuations derived from valuation techniques in which significant inputs or significant value drivers are unobservable. Inputs used to measure fair value might fall in different levels of the fair value hierarchy, in which case the Company defaults to the lowest level input that is significant to the fair value measurement in its entirety. These levels are not necessarily an indication of the risk or liquidity associated with the investments. In determining the appropriate levels, the Company performed a detailed analysis of the assets and liabilities that are subject to ASC 820. Transfers among levels, if any, are recorded as of the beginning of the reporting period. There were no such transfers for the three and six months ended June 30, 2017 . The following table presents fair value measurements as of June 30, 2017 (in thousands): Level 1 Level 2 Level 3 Investments Measured at NAV (2) Total Cash equivalents (1) $ 148,846 $ — $ — $ — $ 148,846 Trading investments Common stocks $ 5,684 $ — $ — $ — $ 5,684 Fixed income securities — 7,139 — — 7,139 Limited partnership interests — — 1,462 772 2,234 Preferred securities 11,715 46,784 — — 58,499 Total trading investments $ 17,399 $ 53,923 $ 1,462 $ 772 $ 73,556 Equity method investments $ — $ — $ — $ 5,892 $ 5,892 Available-for-sale investments Common stocks $ 8,867 $ — $ — $ — $ 8,867 Company-sponsored funds 14,617 — — — 14,617 Fixed income securities — 3,620 — — 3,620 Preferred securities 1,022 18 — — 1,040 Other — — — 113 113 Total available-for-sale investments $ 24,506 $ 3,638 $ — $ 113 $ 28,257 Derivatives - assets Commodity contracts $ 344 $ — $ — $ — $ 344 Foreign exchange contracts — 83 — — 83 Total derivatives - assets $ 344 $ 83 $ — $ — $ 427 Derivatives - liabilities Commodity contracts $ 287 $ — $ — $ — $ 287 Total derivatives - liabilities $ 287 $ — $ — $ — $ 287 _________________________ (1) Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV. (2) Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position. Trading investments in fixed income securities classified as level 2 in the above table were comprised of U.S. Treasury Bills carried at amortized cost, which approximates fair value. Trading investments in preferred securities classified as level 2 were comprised of corporate debt and certain preferred securities. The fair value amounts were generally determined using third-party pricing services. The pricing services may utilize evaluated pricing models that vary by asset class and incorporate available trade, bid and other market information. Since these securities do not trade on a daily basis, the pricing services evaluate pricing applications and apply available information through processes such as yield curves, benchmarking of like securities, sector groupings, and matrix pricing, to prepare evaluations. Trading investments classified as level 3 in the above table were comprised of limited partnership interests which represent the Company’s co-investments through GRP-CIP in limited partnership vehicles that invest in private equity vehicles that invest directly in real estate which are generally valued using a discounted cash flow model. Trading investments classified as investments measured at NAV (or its equivalent) as a practical expedient in the above table were comprised of limited partnership interests which represent the Company’s co-investments through GRP-CIP in limited partnership vehicles that invest in non-registered real estate funds, which are valued based on the NAVs of the underlying funds. As of June 30, 2017 , the Company did not have the ability to redeem these interests. Equity method investments classified as investments measured at NAV (or its equivalent) as a practical expedient in the above table were comprised of the Company’s partnership interests in ACOM and GRP-TE, which approximate their fair value based on the funds’ NAVs. ACOM invests indirectly in exchange-traded commodity futures contracts and other commodity related derivatives through an investment in the Commodities Sub-Fund. The Company has the ability to redeem its investment in ACOM monthly at NAV with prior written notice of 5 days and there are no significant restrictions to redemption. GRP-TE invests in non-registered real estate funds and in private equity vehicles that invest directly in real estate. As of June 30, 2017 , the Company did not have the ability to redeem its investment in GRP-TE. Available-for-sale investments classified as level 2 in the above table were primarily comprised of corporate bonds and certain preferred securities with the fair value generally determined using third-party pricing services. The pricing services may utilize pricing models, and inputs into those models may include reported trades, executable bid and ask prices, broker-dealer quotations, prices or yields of similar securities, benchmark curves and other market information. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security. Available-for-sale investments classified as investments measured at NAV (or its equivalent) as a practical expedient in the above table were comprised of the Company’s co-investment in a Cayman trust invested in global listed infrastructure securities. The following table presents fair value measurements as of December 31, 2016 (in thousands): Level 1 Level 2 Level 3 Investments Measured at NAV (2) Total Cash equivalents (1) $ 140,872 $ — $ — $ — $ 140,872 Trading investments Common stocks $ 5,069 $ — $ — $ — $ 5,069 Fixed income securities — 5,702 — — 5,702 Limited partnership interests — — 1,196 722 1,918 Total trading investment $ 5,069 $ 5,702 $ 1,196 $ 722 $ 12,689 Equity method investments $ — $ — $ — $ 6,459 $ 6,459 Available-for-sale investments Common stocks $ 4,508 $ — $ — $ — $ 4,508 Company-sponsored funds 29,877 — — — 29,877 Preferred securities 1,001 10 — — 1,011 Total available-for-sale investments $ 35,386 $ 10 $ — $ — $ 35,396 Derivatives - assets Commodity contracts $ 343 $ — $ — $ — $ 343 Foreign exchange contracts — 1,417 — — 1,417 Total derivatives - assets $ 343 $ 1,417 $ — $ — $ 1,760 Derivatives - liabilities Commodity contracts $ 266 $ — $ — $ — $ 266 Total derivatives - liabilities $ 266 $ — $ — $ — $ 266 _________________________ (1) Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV. (2) Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position. Trading investments classified as level 2 in the above table were comprised of U.S. Treasury Bills carried at amortized cost, which approximates fair value. Trading investments classified as level 3 in the above table were comprised of limited partnership interests which represent the Company’s co-investments through GRP-CIP in limited partnership vehicles that invest in private equity vehicles that invest directly in real estate which are generally valued using a discounted cash flow model. Trading investments classified as investments measured at NAV (or its equivalent) as a practical expedient in the above table were comprised of limited partnership interests which represent the Company’s co-investments through GRP-CIP in limited partnership vehicles that invest in non-registered real estate funds, which are valued based on the NAVs of the underlying funds. As of December 31, 2016 , the Company did not have the ability to redeem these interests. Equity method investments classified as investments measured at NAV (or its equivalent) as a practical expedient in the above table were comprised of the Company’s partnership interests in ACOM and GRP-TE, which approximate their fair value based on the funds’ NAVs. ACOM invested directly in exchange-traded commodity futures contracts and other commodity related derivatives. The Company has the ability to redeem its investment in ACOM monthly at NAV with prior written notice of 5 days and there are no significant restrictions to redemption. GRP-TE invests in non-registered real estate funds and in private equity vehicles that invest directly in real estate. As of December 31, 2016 , the Company did not have the ability to redeem its investment in GRP-TE. The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Trading Investments Limited Partnership Interests Balance at beginning of period $ 1,476 $ 1,338 $ 1,196 $ 1,312 Purchases / contributions 114 21 138 21 Sales / distributions — (53 ) — (53 ) Realized gains (losses) — — — — Unrealized gains (losses) (1) (128 ) (2 ) 128 24 Transfers into (out of) level 3 — — — — Balance at end of period $ 1,462 $ 1,304 $ 1,462 $ 1,304 _________________________ (1) Pertains to unrealized gains (losses) from securities held at June 30, 2017 and 2016. Realized and unrealized gains (losses) from investments classified as trading investments in the above table were recorded as gain (loss) from trading investments in the Company’s condensed consolidated statements of operations. Valuation Techniques In certain instances, debt, equity and preferred securities are valued on the basis of prices from an orderly transaction between market participants provided by reputable brokers-dealers or independent pricing services. In determining the value of a particular investment, independent pricing services may use information with respect to transactions in such investments, broker quotes, pricing matrices, market transactions in comparable investments and various relationships between investments. As part of its independent price verification process, the Company generally performs reviews of valuations provided by broker-dealers or independent pricing services. Investments in Company-sponsored funds are valued at their closing price or NAV (or its equivalent) as a practical expedient. Foreign exchange contracts are valued by interpolating a value using the spot foreign exchange rate and forward points (based on the spot rate and currency rate differentials), which are all inputs that are observable in active markets (level 2). In the absence of observable market prices, the Company values its investments using valuation methodologies applied on a consistent basis. For some investments, little market activity may exist; management’s determination of fair value is then based on the best information available in the circumstances, and may incorporate management’s own assumptions and involves a significant degree of judgment, taking into consideration a combination of internal and external factors. Such investments are valued on a quarterly basis, taking into consideration any changes in key inputs and changes in economic and other relevant conditions, and valuation models are updated accordingly. The valuation process also includes a review by the Company’s valuation committee which is comprised of senior members from various departments within the Company, including investment management. The valuation committee provides independent oversight of the valuation policies and procedures. The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of June 30, 2017 were: Fair Value Fair Value Significant Input / (in thousands) Methodology Unobservable Inputs Range Limited partnership interests - direct investments in real estate $ 1,462 Discounted cash flows Discount rates Exit capitalization rates Market rental rates 10% - 11% The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of December 31, 2016 were: Fair Value Fair Value Significant Input / (in thousands) Methodology Unobservable Inputs Range Limited partnership interests - direct investments in real estate $ 1,196 Discounted cash flows Discount rates Exit capitalization rates Market rental rates 11% - 12.5% 8% - 8.5% $14.00 - 17.00 psf Changes in the significant unobservable inputs in the tables above may result in a materially higher or lower fair value measurement.

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The following is a summary of the notional and fair value of the derivative financial instruments. The notional amount represents the absolute value amount of all outstanding derivative contracts at June 30, 2017 (in thousands): June 30, 2017 Assets Liabilities Notional Fair Value Notional Fair Value Foreign exchange contracts $ 13,708 $ 83 $ — $ — Commodity contracts 8,069 344 7,441 287 Total derivative financial instruments $ 21,777 $ 427 $ 7,441 $ 287 The following is a summary of the notional and fair value of the derivative financial instruments. The notional amount represents the absolute value amount of all outstanding derivative contracts at December 31, 2016 (in thousands): December 31, 2016 Assets Liabilities Notional Fair Value Notional Fair Value Foreign exchange contracts $ 13,839 $ 1,417 $ — $ — Commodity contracts 6,538 343 4,825 266 Total derivative financial instruments $ 20,377 $ 1,760 $ 4,825 $ 266 Cash included in due from broker on the condensed consolidated statement of financial condition of approximately $88,000 as of June 30, 2017 was held as collateral for futures contracts. Securities included in trading investments on the condensed consolidated statement of financial condition of approximately $598,000 and $487,000 as of June 30, 2017 and December 31, 2016 , respectively, were held as collateral for futures contracts. Gains (losses) from derivative financial instruments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Foreign exchange contracts $ (479 ) $ 715 $ (1,334 ) $ (541 ) Commodity contracts (409 ) 2,823 (856 ) 2,923 Total gains (losses) from derivative financial instruments $ (888 ) $ 3,538 $ (2,190 ) $ 2,382

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is calculated by dividing net income attributable to common stockholders by the weighted average shares outstanding. Diluted earnings per share is calculated by dividing net income attributable to common stockholders by the total weighted average shares of common stock outstanding and common stock equivalents. Common stock equivalents are comprised of dilutive potential shares from restricted stock unit awards. Common stock equivalents are excluded from the computation if their effect is anti-dilutive. Diluted earnings per share is computed using the treasury stock method. There were no anti-dilutive common stock equivalents for both the three months ended June 30, 2017 and 2016. Anti-dilutive common stock equivalents of approximately 9,000 and 28,000 shares were excluded from the computation for the six months ended June 30, 2017 and 2016, respectively. The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2017 and 2016 (in thousands, except per share data): Three Months Ended Six Months Ended 2017 2016 2017 2016 Net income $ 22,998 $ 24,921 $ 45,942 $ 42,788 Less: Net (income) loss attributable to redeemable noncontrolling interest 476 (113 ) 517 103 Net income attributable to common stockholders $ 23,474 $ 24,808 $ 46,459 $ 42,891 Basic weighted average shares outstanding 46,373 45,984 46,308 45,896 Dilutive potential shares from restricted stock units 529 394 445 391 Diluted weighted average shares outstanding 46,902 46,378 46,753 46,287 Basic earnings per share attributable to common stockholders $ 0.51 $ 0.54 $ 1.00 $ 0.93 Diluted earnings per share attributable to common stockholders $ 0.50 $ 0.53 $ 0.99 $ 0.93

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended June 30, 2017 and 2016, the effective tax rate was approximately 38.4% and 35.5% , respectively. For the six months ended June 30, 2017 and 2016, the effective tax rate was approximately 37.1% and 36.6% , respectively. The effective tax rates differed from the U.S. federal statutory rate primarily due to state and foreign taxes. In addition, for the three and six months ended June 30, 2016, the effective tax rate also included the release of a valuation allowance on unrealized gains on the Company’s seed investments. Deferred income taxes represent the tax effects of the temporary differences between book and tax basis and are measured using enacted tax rates that will be in effect when such items are expected to reverse. The Company’s net deferred tax asset is primarily comprised of future income tax deductions attributable to the delivery of unvested restricted stock units. The Company records a valuation allowance, when necessary, to reduce deferred tax assets to an amount that more likely than not will be realized.

Regulatory Requirements

Regulatory Requirements	6 Months Ended
	Jun. 30, 2017
Regulatory Capital Requirements [Abstract]
Regulatory Requirements	Regulatory Requirements CSS, a registered broker-dealer in the U.S., is subject to the SEC’s Uniform Net Capital Rule 15c3-1 (the Rule), which requires that broker-dealers maintain a minimum level of net capital, as prescribed by the Rule. As of June 30, 2017 , CSS had net capital of approximately $3,859,000 , which exceeded its requirements by approximately $3,662,000 . The Rule also provides that equity capital may not be withdrawn or cash dividends paid if the resulting net capital of a broker-dealer is less than the amount required under the Rule and requires prior notice to the SEC for certain withdrawals of capital. CSS does not carry customer accounts and is exempt from SEC Rule 15c3-3 pursuant to provisions (k)(1) and (k)(2)(i) of such rule. CSAL and CSUK are regulated outside the U.S. by the Hong Kong Securities and Futures Commission and the United Kingdom Financial Conduct Authority, respectively. As of June 30, 2017 , CSAL and CSUK had aggregate regulatory capital of approximately $76,290,000 , which exceeded aggregate regulatory capital requirements by approximately $72,376,000 .

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company is an investment adviser to, and has administration agreements with, affiliated funds for which certain employees are officers and/or directors. The following table sets forth the amount of revenue the Company earned from these affiliated funds for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Investment advisory and administration fees $ 60,099 $ 55,817 $ 117,499 $ 107,728 Distribution and service fees 5,104 4,671 10,150 8,904 $ 65,203 $ 60,488 $ 127,649 $ 116,632 Sales proceeds, gross realized gains, gross realized losses and dividend income from available-for-sale investments in Company-sponsored funds for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds from sales $ 10,070 $ — $ 15,105 $ — Gross realized gains 60 — 80 — Gross realized losses — — — — Dividend income 133 270 388 270 The Company has agreements with certain affiliated open-end and closed-end funds to reimburse certain fund expenses. For the three months ended June 30, 2017 and 2016 , expenses of approximately $2,731,000 and $ 1,789,000 , respectively, were incurred by the Company pursuant to these agreements and are included in general and administrative expenses. For the six months ended June 30, 2017 and 2016 , fund reimbursement expenses of approximately $5,104,000 and $3,823,000 , respectively, were incurred. Included in accounts receivable at June 30, 2017 and December 31, 2016 are receivables due from Company-sponsored funds of approximately $21,419,000 and $20,221,000 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Rent expense charged to operations, including escalation charges for real estate and other expenses, totaled approximately $2,800,000 and $2,965,000 for the three months ended June 30, 2017 and 2016, respectively, and approximately $5,600,000 and $5,765,000 for the six months ended June 30, 2017 and 2016, respectively. From time to time, the Company is involved in legal matters relating to claims arising in the ordinary course of business. There are currently no such matters pending that the Company believes could have a material adverse effect on its condensed consolidated results of operations, cash flows or financial position. The Company periodically commits to fund a portion of the equity in certain of its sponsored investment products. The Company has committed to co-invest up to $5.1 million alongside GRP-TE, a portion of which is made through GRP-TE and the remainder of which is made through GRP-CIP for up to 12 years through the life of GRP-TE. As of June 30, 2017 , the Company has funded approximately $3.5 million with respect to this commitment. The actual timing for funding the unfunded portion of this commitment is currently unknown, as the drawdown of the Company’s unfunded commitment is contingent on the timing of drawdowns by the underlying funds and co-investments in which GRP-TE invests. The unfunded commitment was not recorded on the Company’s condensed consolidated statements of financial condition as of June 30, 2017 .

Concentration of Credit Risk

Concentration of Credit Risk	6 Months Ended
	Jun. 30, 2017
Risks and Uncertainties [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk The Company’s cash and cash equivalents are principally on deposit with three major financial institutions. The Company is subject to credit risk should these financial institutions be unable to fulfill their obligations.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated the need for disclosures and/or adjustments resulting from subsequent events through the date the condensed consolidated financial statements were issued. Other than the items described below, the Company determined that there were no additional subsequent events that require disclosure and/or adjustment. On August 3, 2017, CNS declared a quarterly dividend on its common stock in the amount of $0.28 per share. The dividend will be payable on September 21, 2017 to stockholders of record at the close of business on September 1, 2017.

Basis of Presentation and Sig22

Basis of Presentation and Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements —In March 2016, the Financial Accounting Standards Board (FASB) issued new guidance amending the current accounting for an investment that becomes qualified for the equity method of accounting. The guidance requires that the cost of acquiring an additional interest in the investment, if any, that resulted in it qualifying for the equity method be added to the carrying value of the investment. The equity method will then be applied from that point forward without any retroactive application or adjustment. This new guidance was effective for the Company’s first quarter of 2017. The adoption of this new guidance did not have a material impact on its condensed consolidated financial statements and related disclosures.
Accounting Estimates	Accounting Estimates —The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Management believes the estimates used in preparing the condensed consolidated financial statements are reasonable and prudent. Actual results could differ from those estimates.
Consolidation	Consolidation of Company-sponsored Funds —Investments in Company-sponsored funds and management fees are evaluated at inception and thereafter, if there is a reconsideration event, in order to determine whether to apply the Variable Interest Entity (VIE) model or the Voting Interest Entity (VOE) model. In performing this analysis, all of the Company’s management fees are presumed to be commensurate and at market and are therefore not considered variable interests. A VIE is an entity in which either (a) the equity investment at risk is not sufficient to permit the entity to finance its own activities without additional financial support or (b) the group of holders of the equity investment at risk lack certain characteristics of a controlling financial interest. The primary beneficiary is the entity that has (a) the power to direct the activities of the VIE that most significantly affect its performance and (b) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. Investments and redemptions or amendments to the governing documents of the respective entities could affect an entity’s status as a VIE or the determination of the primary beneficiary. The Company assesses whether it is the primary beneficiary of any VIEs identified by evaluating its economic interests in the entity held either directly by the Company and its affiliates or indirectly through employees. VIEs for which the Company is deemed to be the primary beneficiary are consolidated. Investments in Company-sponsored funds that are determined to be VOEs are consolidated when the Company’s ownership interest is greater than 50% of the outstanding voting interests of the fund or when the Company is the general partner of the fund and the limited partners do not have substantive kick-out or participating rights in the fund. The Company records noncontrolling interests in consolidated subsidiaries for which the Company’s ownership is less than 100 %. See Note 4 for further discussion about the Company’s seed investments.
Cash and Cash Equivalents	Cash and Cash Equivalents —Cash equivalents consist of short-term, highly liquid investments, which are readily convertible into cash and have original maturities of three months or less.
Due from/to Brokers	Due from/to Brokers —The Company conducts business, primarily with respect to its consolidated seed investments, with brokers for certain of its investment activities. The clearing and custody operations for these investment activities are performed pursuant to contractual agreements. The due from/to brokers balance represents cash and cash equivalents balances at brokers/custodians and/or receivables and payables for unsettled securities transactions.
Investments	Investments —Management of the Company determines the appropriate classification of its investments at the time of purchase and re-evaluates such determination at each statement of financial condition date. Investments classified as trading represent securities held within the affiliated funds that the Company consolidates and are measured at fair value based on quoted market prices, market prices obtained from independent pricing services engaged by management or as determined by management and approved by the Company’s valuation committee. Unrealized gains and losses are recorded as gain (loss) from trading investments—net in the Company’s condensed consolidated statements of operations. Investments classified as equity method investments represent seed investments in which the Company owns between 20 - 50% of the outstanding voting interests in the affiliated fund or when it is determined that the Company is able to exercise significant influence but not control over the investments. When using the equity method, the Company recognizes its respective share of the affiliated investee fund net income or loss for the period which is recorded as equity in earnings (losses) of affiliates in the Company’s condensed consolidated statements of operations. As of June 30, 2017 , the Company’s equity method investments consisted of interests in affiliated funds which measure their underlying investments at fair value based on quoted market prices or NAV (or its equivalent) as a practical expedient and report a net asset value on a recurring basis. The carrying amounts of these investments approximate their fair value. Investments classified as available-for-sale are comprised of equity securities, fixed income securities, investment-grade preferred instruments and investments in Company-sponsored open-end funds where the Company has neither control nor the ability to exercise significant influence. These investments are carried at fair value based on quoted market prices or market prices obtained from independent pricing services engaged by management, with unrealized gains and losses, net of tax, reported in accumulated other comprehensive income. The Company periodically reviews each individual security position that has an unrealized loss, or impairment, to determine if that impairment is other-than-temporary. If the Company believes an impairment of a security position is other-than-temporary, based on available quantitative and qualitative information as of the report date, the loss will be recognized as gain (loss) from available-for-sale investments—net in the Company’s condensed consolidated statements of operations. From time to time, the affiliated funds consolidated by the Company enter into derivative contracts to gain exposure to the underlying commodities markets or to hedge market and credit risks of the underlying portfolios utilizing options, total return swaps, credit default swaps and futures contracts. These instruments are measured at fair value based on their settlement price at the close of trading on the associated commodities exchange or board of trade with gains and losses recorded as gain (loss) from trading investments—net in the Company’s condensed consolidated statements of operations. The fair values of these instruments are recorded in other assets or other liabilities and accrued expenses on the Company’s condensed consolidated statements of financial condition. As of June 30, 2017 , none of the outstanding derivative contracts were subject to a master netting agreement or other similar arrangement. Additionally, from time to time, the Company enters into foreign exchange contracts to hedge its currency exposure related to certain client receivables. These instruments are measured at fair value with gains and losses recorded in other non-operating income (loss) in the Company’s condensed consolidated statements of operations. The fair values of these contracts are recorded in other assets or other liabilities and accrued expenses on the Company’s condensed consolidated statements of financial condition.
Goodwill and Intangible Assets	Goodwill and Intangible Assets —Goodwill represents the excess of the cost of the Company’s investment in the net assets of an acquired company over the fair value of the underlying identifiable net assets at the date of acquisition. Goodwill and indefinite lived intangible assets are not amortized but are tested at least annually for impairment by comparing the fair value to their carrying amounts. Finite lived intangible assets are amortized over their useful lives and are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. See Note 3 for further discussion about the Company’s goodwill and intangible assets.
Redeemable Noncontrolling Interest	Redeemable Noncontrolling Interest —Redeemable noncontrolling interest represents third-party interests in the Company’s consolidated entities. This interest is redeemable at the option of the investors and therefore is not treated as permanent equity. Redeemable noncontrolling interest is remeasured at redemption value which approximates the fair value at each reporting period.
Investment Advisory and Administration Fees	Investment Advisory and Administration Fees —The Company earns revenue by providing asset management services to institutional accounts and to Company-sponsored open-end and closed-end funds. Investment advisory fees are earned pursuant to the terms of investment management agreements and are based on a contractual fee rate applied to the assets in the portfolio. The Company also earns administration fees from certain Company-sponsored open-end and closed-end funds pursuant to the terms of underlying administration contracts. Administration fees are based on the average assets under management of such funds. Investment advisory and administration fee revenue is recognized as such fees are earned.
Distribution and Service Fee Revenue	Distribution and Service Fee Revenue —Distribution and service fee revenue is based on the average daily net assets of certain share classes of the Company’s sponsored open-end funds distributed by CSS. Distribution and service fee revenue is earned daily and is recorded gross of any third-party distribution and service fee expense for applicable share classes.
Distribution and Service Fee Expense	Distribution and Service Fee Expense —Distribution and service fee expense includes distribution fees, shareholder servicing fees and intermediary assistance payments. Distribution and service fee expense is recorded as incurred. Distribution fee expense represents payments made to qualified intermediaries for (i) assistance in connection with the distribution of the Company’s sponsored open-end funds’ shares and (ii) for other expenses such as advertising costs and printing and distribution of prospectuses to investors. Such amounts may also be used to pay financial intermediaries for services as specified in the terms of written agreements complying with Rule 12b-1 of the Investment Company Act of 1940 (Rule 12b-1). The Company pays distribution fee expense based on the average daily net assets under management of certain share classes of the funds. Shareholder servicing fee expense represents payments made to qualified intermediaries for shareholder account service and maintenance. These services are provided pursuant to written agreements with such qualified institutions. Intermediary assistance payments represent payments to qualified intermediaries for activities related to distribution, shareholder servicing and marketing and support of Company-sponsored open-end funds and are incremental to those described above. Intermediary assistance payments are generally based on the average assets under management or the number of accounts being serviced.
Portfolio Consulting and Other	Portfolio Consulting and Other —The Company earns portfolio consulting and other fees by (i) providing portfolio consulting services in connection with model-based strategy accounts; (ii) earning a licensing fee for the use of the Company’s proprietary indexes; and (iii) providing portfolio monitoring services related to a number of unit investment trusts. This revenue is earned pursuant to the terms of the underlying contract, and the fee schedules for these relationships vary based on the type of services the Company provides for each relationship. This revenue is recognized as such fees are earned.
Stock-based Compensation	Stock-based Compensation —The Company recognizes compensation expense for the grant-date fair value of awards of equity instruments to employees. This expense is recognized over the period during which employees are required to provide service. Forfeitures are recorded as incurred.
Income Taxes	Income Taxes —The Company records the current and deferred tax consequences of all transactions that have been recognized on its condensed consolidated financial statements in accordance with the provisions of the enacted tax laws. Deferred tax assets are recognized for temporary differences that will result in deductible amounts in future years at tax rates that are expected to apply in those years. Deferred tax liabilities are recognized for temporary differences that will result in taxable income in future years at tax rates that are expected to apply in those years. The Company records a valuation allowance, when necessary, to reduce deferred tax assets to an amount that more likely than not will be realized. The effective tax rate for interim periods represents the Company’s best estimate of the effective tax rate expected to be applied to the full fiscal year. The calculation of the tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in a multitude of jurisdictions across the Company’s global operations. A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits.
Currency Translation and Transactions	Currency Translation and Transactions —Assets and liabilities of subsidiaries having non-U.S. dollar functional currencies are translated at exchange rates at the applicable condensed consolidated statement of financial condition date. Revenue and expenses of such subsidiaries are translated at average exchange rates during the period. The gains or losses resulting from translating non-U.S. dollar functional currency into U.S. dollars are included in the Company’s condensed consolidated statements of comprehensive income. The cumulative translation adjustment was $(5,471,000) and $(6,845,000) as of June 30, 2017 and December 31, 2016 , respectively. Gains or losses resulting from non-U.S. dollar currency transactions are included in other non-operating income (loss) in the condensed consolidated statements of operations.
Comprehensive Income	Comprehensive Income —The Company reports all changes in comprehensive income on the condensed consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common stockholders, as well as the net of tax amounts attributable to foreign currency translation gain (loss), unrealized gain (loss) from available-for-sale investments and reclassification of realized gain (loss) from available-for-sale investments to the statements of operations.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements —In May 2017, the FASB issued new guidance for modification accounting related to share-based payment transactions in order to provide clarity and to reduce current diversity in practice. The amendments in this new guidance do not fundamentally change the notion of a modification. Instead, the amendments clarify which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting. The amendments will be effective for the Company’s first quarter of 2018 and must be applied prospectively to any awards modified on or after the adoption date. The Company does not expect the adoption of the new standard to have a material effect on its consolidated financial statements and related disclosures. In January 2017, the FASB issued guidance to simplify the goodwill impairment test by removing the requirement to perform 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. This new guidance will be effective for the Company’s first quarter of 2020. The Company is currently evaluating the potential effect of this new guidance on its condensed consolidated financial statements and related disclosures. In August 2016, the FASB amended the current guidance on the classification of certain cash receipts and payments in the statement of cash flows. This guidance is intended to unify the currently diverse presentations and classifications, which address eight classification issues related to the statement of cash flows, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. This amended guidance will be effective for the Company’s first quarter of 2018 and requires a retrospective approach to adoption. The Company is currently evaluating the potential effect of this revised guidance on its condensed consolidated financial statements and related disclosures. In February 2016, the FASB issued guidance introducing a new lease model which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. The new standard establishes a right-of-use model (ROU) that requires a lessee to recognize an ROU asset and lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The new guidance also requires disclosures by lessees and lessors to enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new guidance is effective on January 1, 2019, with early adoption permitted. The Company expects to adopt the new standard on its effective date. A modified retrospective transition approach is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. While the Company is continuing to assess the effect of adoption, it currently believes the most significant change relates to the recognition of new ROU assets and lease liabilities on its condensed consolidated statements of financial condition for its office space and other operating leases. The Company does not expect a significant change in its leasing activity between now and adoption. The Company is still assessing which of the available practical expedients it plans on electing upon adoption. In January 2016, the FASB issued new guidance amending the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. This new guidance will be effective for the Company’s first quarter of 2018 and will require a cumulative-effect adjustment to beginning retained earnings as of the date of adoption. Upon adoption of this guidance, changes in the fair value of the Company’s available-for-sale equity investments will be reported through earnings rather than through other comprehensive income. Using values as of June 30, 2017, the cumulative-effect adjustment to beginning retained earnings would result in a reclassification of net unrealized gains from other comprehensive income to retained earnings in the amount of $930,000 , net of tax. Additionally, if the Company had applied the new guidance for the three months ended June 30, 2017, $606,000 of net unrealized losses recorded in other comprehensive income would have been recorded in non-operating income (loss) in the Company’s condensed consolidated statement of operations. In May 2014, the FASB issued new guidance which outlined a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued revised guidance which clarifies the guidance related to (a) determining the appropriate unit of account under the revenue standard’s principal versus agent guidance and (b) applying the indicators of whether an entity is a principal or an agent in accordance with the revenue standard’s control principle. In April 2016, the FASB issued an amendment to provide more detailed guidance including additional implementation guidance and examples related to (a) identifying performance obligations and (b) licenses of intellectual property. In May 2016, the FASB amended the standard to clarify the guidance on assessing collectibility, presenting sales taxes, measuring noncash consideration, and certain transition matters. This new guidance will be effective for the Company’s first quarter of 2018 and requires either a retrospective or a modified retrospective approach to adoption. The Company has not yet determined which transition method will be employed upon adoption, though it has reached conclusions on key accounting assessments related to the new guidance, including identification of performance obligations, and evaluation of existing contracts and revenue streams for potential changes in the amount and timing of revenue recognition. The Company is still finalizing its assessment and quantifying the impacts related to accounting for costs incurred to obtain a contract, presentation of certain costs presented on either a gross or net basis, as well as implementing changes to its systems, processes and internal controls to meet the new guidance’s reporting and disclosure requirements.
Valuation Techniques	Valuation Techniques In certain instances, debt, equity and preferred securities are valued on the basis of prices from an orderly transaction between market participants provided by reputable brokers-dealers or independent pricing services. In determining the value of a particular investment, independent pricing services may use information with respect to transactions in such investments, broker quotes, pricing matrices, market transactions in comparable investments and various relationships between investments. As part of its independent price verification process, the Company generally performs reviews of valuations provided by broker-dealers or independent pricing services. Investments in Company-sponsored funds are valued at their closing price or NAV (or its equivalent) as a practical expedient. Foreign exchange contracts are valued by interpolating a value using the spot foreign exchange rate and forward points (based on the spot rate and currency rate differentials), which are all inputs that are observable in active markets (level 2). In the absence of observable market prices, the Company values its investments using valuation methodologies applied on a consistent basis. For some investments, little market activity may exist; management’s determination of fair value is then based on the best information available in the circumstances, and may incorporate management’s own assumptions and involves a significant degree of judgment, taking into consideration a combination of internal and external factors. Such investments are valued on a quarterly basis, taking into consideration any changes in key inputs and changes in economic and other relevant conditions, and valuation models are updated accordingly. The valuation process also includes a review by the Company’s valuation committee which is comprised of senior members from various departments within the Company, including investment management. The valuation committee provides independent oversight of the valuation policies and procedures.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	The following table details the gross carrying amounts and accumulated amortization of the intangible assets at June 30, 2017 and December 31, 2016 (in thousands): Remaining Amortization Period (in months) Gross Carrying Amount Accumulated Amortization Intangible Assets, Net June 30, 2017: Amortized intangible assets: Client relationships 18 $ 1,543 $ (1,403 ) $ 140 Non-amortized intangible assets: Mutual fund management contracts — 1,250 — 1,250 Total $ 2,793 $ (1,403 ) $ 1,390 December 31, 2016: Amortized intangible assets: Client relationships 24 $ 1,543 $ (1,359 ) $ 184 Non-amortized intangible assets: Mutual fund management contracts — 1,250 — 1,250 Total $ 2,793 $ (1,359 ) $ 1,434
Schedule Future Amortization Expense	uture amortization expense is as follows (in thousands): Periods Ending December 31, Remaining Amortization Expense 2017 $ 45 2018 95 Total $ 140

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Investments [Abstract]
Summary Investment Holdings	The following is a summary of the Company’s seed investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, December 31, 2016 Trading investments $ 73,556 $ 12,689 Equity method investments 5,892 6,459 Available-for-sale investments 28,257 35,396
Gain (Loss) on Investments	Gain (loss) from seed investments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Gain (loss) from trading investments—net (1) $ 2 $ 1,017 $ 275 $ 810 Equity in earnings (losses) of affiliates (279 ) 2,640 (568 ) 3,067 Gain (loss) from available-for-sale investments—net 83 158 118 128 Net gain (loss) from seed investments $ (194 ) $ 3,815 $ (175 ) $ 4,005 Number of new funds seeded 1 — 2 — _________________________ (1) Includes net income (loss) attributable to redeemable noncontrolling interest for the periods presented.
Schedule of Variable Interest Entities	The following represents the portion of the condensed consolidated statements of financial condition attributable to the consolidated VIEs as of June 30, 2017 and December 31, 2016 . The assets may only be used to settle obligations of each VIE and the liabilities are the sole obligation of each VIE, for which creditors do not have recourse to the general credit of the Company (in thousands): June 30, 2017 December 31, 2016 GLI SICAV GRP-CIP SICAV Preferred Total GLI SICAV GRP-CIP Total Assets: Trading investments $ 5,684 $ 2,234 $ 58,499 $ 66,417 $ 5,069 $ 1,918 $ 6,987 Due from broker 209 198 12,582 12,989 181 294 475 Other assets 44 — 788 832 43 — 43 Total assets $ 5,937 $ 2,432 $ 71,869 $ 80,238 $ 5,293 $ 2,212 $ 7,505 Liabilities: Due to broker $ 59 $ — $ 11,776 $ 11,835 $ — $ — $ — Other liabilities and accrued expenses 46 5 70 121 70 5 75 Total liabilities $ 105 $ 5 $ 11,846 $ 11,956 $ 70 $ 5 $ 75
Schedule of Fair Value of Trading Investments and Equity Method Method Investments	The following is a summary of the fair value of trading investments and equity method investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 December 31, 2016 Trading Investments Equity Method Investments Trading Investments Equity Method Investments Voting Interest Entities ACOM $ — $ 5,795 $ — $ 6,371 CDF 7,139 — 5,702 — Variable Interest Entities GLI SICAV 5,684 — 5,069 — GRP-CIP 2,234 — 1,918 — GRP-TE — 97 — 88 SICAV Preferred 58,499 — — — Total $ 73,556 $ 5,892 $ 12,689 $ 6,459
Trading Investments	Gain (loss) from trading investments—net for the three and six months ended June 30, 2017 and 2016, which represent realized and unrealized gains and losses recorded by the funds the Company consolidates, are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Voting Interest Entities CDF $ (420 ) $ 879 $ (845 ) $ 979 LPX — — — (769 ) Variable Interest Entities GLI SICAV 173 183 574 575 GRP-CIP (109 ) (45 ) 188 25 SICAV Preferred 358 — 358 — Total gain (loss) from trading investments—net $ 2 $ 1,017 $ 275 $ 810
Schedule of Equity in Earnings (Losses) of Affiliates	Equity in earnings (losses) of affiliates for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Voting Interest Entities ACOM $ (274 ) $ 791 $ (576 ) $ 867 LPX — 228 — 474 MLO — 1,618 — 1,737 Variable Interest Entities GRP-TE (5 ) 3 8 (11 ) Total equity in earnings (losses) of affiliates $ (279 ) $ 2,640 $ (568 ) $ 3,067
Schedule of Available-for-sale Investments Reconciliation	The following is a summary of the cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments as of June 30, 2017 and December 31, 2016 (in thousands): June 30, 2017 Cost Gross Unrealized Gains Gross Unrealized Losses (1) Fair Value Common stocks $ 8,654 $ 489 $ (276 ) $ 8,867 Company-sponsored funds 13,376 1,265 (24 ) 14,617 Fixed income securities 3,627 17 (24 ) 3,620 Preferred securities 993 47 — 1,040 Other 100 13 — 113 Total available-for-sale investments $ 26,750 $ 1,831 $ (324 ) $ 28,257 _________________________ (1) At June 30, 2017 , there were no securities with material unrealized losses continuously for a period of more than 12 months. December 31, 2016 Cost Gross Unrealized Gains Gross (1) Fair Value Common stocks $ 4,639 $ 194 $ (325 ) $ 4,508 Company-sponsored funds 28,232 1,755 (110 ) 29,877 Preferred securities 1,020 13 (22 ) 1,011 Total available-for-sale investments $ 33,891 $ 1,962 $ (457 ) $ 35,396 _________________________ (1) At December 31, 2016 , there were no securities with unrealized losses continuously for a period of more than 12 months.
Realized Gain (Loss) on Investments	Sales proceeds, gross realized gains and losses from available-for-sale investments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds from sales $ 13,024 $ 3,464 $ 19,910 $ 5,419 Gross realized gains 216 321 314 471 Gross realized losses (133 ) (163 ) (196 ) (343 )

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements, Recurring and Nonrecurring	The following table presents fair value measurements as of December 31, 2016 (in thousands): Level 1 Level 2 Level 3 Investments Measured at NAV (2) Total Cash equivalents (1) $ 140,872 $ — $ — $ — $ 140,872 Trading investments Common stocks $ 5,069 $ — $ — $ — $ 5,069 Fixed income securities — 5,702 — — 5,702 Limited partnership interests — — 1,196 722 1,918 Total trading investment $ 5,069 $ 5,702 $ 1,196 $ 722 $ 12,689 Equity method investments $ — $ — $ — $ 6,459 $ 6,459 Available-for-sale investments Common stocks $ 4,508 $ — $ — $ — $ 4,508 Company-sponsored funds 29,877 — — — 29,877 Preferred securities 1,001 10 — — 1,011 Total available-for-sale investments $ 35,386 $ 10 $ — $ — $ 35,396 Derivatives - assets Commodity contracts $ 343 $ — $ — $ — $ 343 Foreign exchange contracts — 1,417 — — 1,417 Total derivatives - assets $ 343 $ 1,417 $ — $ — $ 1,760 Derivatives - liabilities Commodity contracts $ 266 $ — $ — $ — $ 266 Total derivatives - liabilities $ 266 $ — $ — $ — $ 266 _________________________ (1) Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV. (2) Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position. The following table presents fair value measurements as of June 30, 2017 (in thousands): Level 1 Level 2 Level 3 Investments Measured at NAV (2) Total Cash equivalents (1) $ 148,846 $ — $ — $ — $ 148,846 Trading investments Common stocks $ 5,684 $ — $ — $ — $ 5,684 Fixed income securities — 7,139 — — 7,139 Limited partnership interests — — 1,462 772 2,234 Preferred securities 11,715 46,784 — — 58,499 Total trading investments $ 17,399 $ 53,923 $ 1,462 $ 772 $ 73,556 Equity method investments $ — $ — $ — $ 5,892 $ 5,892 Available-for-sale investments Common stocks $ 8,867 $ — $ — $ — $ 8,867 Company-sponsored funds 14,617 — — — 14,617 Fixed income securities — 3,620 — — 3,620 Preferred securities 1,022 18 — — 1,040 Other — — — 113 113 Total available-for-sale investments $ 24,506 $ 3,638 $ — $ 113 $ 28,257 Derivatives - assets Commodity contracts $ 344 $ — $ — $ — $ 344 Foreign exchange contracts — 83 — — 83 Total derivatives - assets $ 344 $ 83 $ — $ — $ 427 Derivatives - liabilities Commodity contracts $ 287 $ — $ — $ — $ 287 Total derivatives - liabilities $ 287 $ — $ — $ — $ 287 _________________________ (1) Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV. (2) Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position.
Fair Value, Valuation Technique, Unobservable Inputs	The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Trading Investments Limited Partnership Interests Balance at beginning of period $ 1,476 $ 1,338 $ 1,196 $ 1,312 Purchases / contributions 114 21 138 21 Sales / distributions — (53 ) — (53 ) Realized gains (losses) — — — — Unrealized gains (losses) (1) (128 ) (2 ) 128 24 Transfers into (out of) level 3 — — — — Balance at end of period $ 1,462 $ 1,304 $ 1,462 $ 1,304 _________________________ (1) Pertains to unrealized gains (losses) from securities held at June 30, 2017 and 2016. The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of June 30, 2017 were: Fair Value Fair Value Significant Input / (in thousands) Methodology Unobservable Inputs Range Limited partnership interests - direct investments in real estate $ 1,462 Discounted cash flows Discount rates Exit capitalization rates Market rental rates 10% - 11% The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of December 31, 2016 were: Fair Value Fair Value Significant Input / (in thousands) Methodology Unobservable Inputs Range Limited partnership interests - direct investments in real estate $ 1,196 Discounted cash flows Discount rates Exit capitalization rates Market rental rates 11% - 12.5% 8% - 8.5% $14.00 - 17.00 psf

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The following is a summary of the notional and fair value of the derivative financial instruments. The notional amount represents the absolute value amount of all outstanding derivative contracts at June 30, 2017 (in thousands): June 30, 2017 Assets Liabilities Notional Fair Value Notional Fair Value Foreign exchange contracts $ 13,708 $ 83 $ — $ — Commodity contracts 8,069 344 7,441 287 Total derivative financial instruments $ 21,777 $ 427 $ 7,441 $ 287 The following is a summary of the notional and fair value of the derivative financial instruments. The notional amount represents the absolute value amount of all outstanding derivative contracts at December 31, 2016 (in thousands): December 31, 2016 Assets Liabilities Notional Fair Value Notional Fair Value Foreign exchange contracts $ 13,839 $ 1,417 $ — $ — Commodity contracts 6,538 343 4,825 266 Total derivative financial instruments $ 20,377 $ 1,760 $ 4,825 $ 266
Gains (losses) on Derivatives	Gains (losses) from derivative financial instruments for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Foreign exchange contracts $ (479 ) $ 715 $ (1,334 ) $ (541 ) Commodity contracts (409 ) 2,823 (856 ) 2,923 Total gains (losses) from derivative financial instruments $ (888 ) $ 3,538 $ (2,190 ) $ 2,382

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2017 and 2016 (in thousands, except per share data): Three Months Ended Six Months Ended 2017 2016 2017 2016 Net income $ 22,998 $ 24,921 $ 45,942 $ 42,788 Less: Net (income) loss attributable to redeemable noncontrolling interest 476 (113 ) 517 103 Net income attributable to common stockholders $ 23,474 $ 24,808 $ 46,459 $ 42,891 Basic weighted average shares outstanding 46,373 45,984 46,308 45,896 Dilutive potential shares from restricted stock units 529 394 445 391 Diluted weighted average shares outstanding 46,902 46,378 46,753 46,287 Basic earnings per share attributable to common stockholders $ 0.51 $ 0.54 $ 1.00 $ 0.93 Diluted earnings per share attributable to common stockholders $ 0.50 $ 0.53 $ 0.99 $ 0.93

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table sets forth the amount of revenue the Company earned from these affiliated funds for the three and six months ended June 30, 2017 and 2016 (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Investment advisory and administration fees $ 60,099 $ 55,817 $ 117,499 $ 107,728 Distribution and service fees 5,104 4,671 10,150 8,904 $ 65,203 $ 60,488 $ 127,649 $ 116,632
Schedule of Realized Gain (Loss)	ividend income from available-for-sale investments in Company-sponsored funds for the three and six months ended June 30, 2017 and 2016 are summarized below (in thousands): Three Months Ended Six Months Ended 2017 2016 2017 2016 Proceeds from sales $ 10,070 $ — $ 15,105 $ — Gross realized gains 60 — 80 — Gross realized losses — — — — Dividend income 133 270 388 270

Basis of Presentation and Sig29

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage range	20.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage range	50.00%
Accumulated Translation Adjustment
Cumulative Translation Adjustments balance [Line Items]
Cumulative Foreign Currency Translation Adjustment, Net of Tax	$ (5,471)	$ (6,845)

Basis of Presentation and Sig30

Basis of Presentation and Significant Accounting Policies Cash Equivalents Original Maturities (Details)	6 Months Ended
	Jun. 30, 2017
Maximum
Restricted Cash and Cash Equivalents Items [Line Items]
Contractual Maturities of Time Deposits, $100,000 or More, Description	3 months

Basis of Presentation and Sig31

Basis of Presentation and Significant Accounting Policies Schedule of less than wholly owned subsidiaries (Details)	6 Months Ended
	Jun. 30, 2017
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	50.00%
Maximum
Noncontrolling Interest, Ownership Percentage by Parent	100.00%

Basis of Presentation and Sig32

Basis of Presentation and Significant Accounting Policies New Accountings Pronouncements (Details)	6 Months Ended
	Jun. 30, 2017USD ($)
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefits	$ 54,000
Additional Paid-in Capital | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	285,000
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	930,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ 606,000

Goodwill and Intangible Asset33

Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Goodwill	$ 18,476		$ 18,476		$ 17,684
Goodwill, Translation Adjustments			792
Finite-Lived Intangible Assets, Accumulated Amortization	(1,403)		(1,403)		(1,359)
Intangible Assets, Net	140		140
Intangible Assets, Gross	2,793		2,793		2,793
Intangible Assets, Net	1,390		1,390		$ 1,434
Amortization of Intangible Assets	22	$ 22	$ 44	$ 44
Remaining Amortization Period			18		24
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,017	45		$ 45
2,018	95		95
Total	140		140
Client Relationships
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	1,543		1,543		$ 1,543
Finite-Lived Intangible Assets, Accumulated Amortization	(1,403)		(1,403)		(1,359)
Intangible Assets, Net	140		140		184
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Total	140		140		184
Mutual Fund Management Contracts
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	$ 1,250		$ 1,250		$ 1,250

Investments Trading and Equity

Investments Trading and Equity Investments (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017USD ($)new_funds_seeded	Jun. 30, 2016USD ($)new_funds_seeded	Jun. 30, 2017USD ($)new_funds_seeded	Jun. 30, 2016USD ($)new_funds_seeded	Dec. 31, 2016USD ($)
Trading Securities and Other Trading Assets [Line Items]
Trading investments	[1],[2]	$ 73,556		$ 73,556		$ 12,689
Equity method investments		5,892		5,892		6,459
Available-for-sale investments		28,257		28,257		35,396
Gain (loss) from trading investments—net	[3]	2	$ 1,017	275	$ 810
Equity in earnings (losses) of affiliates		(279)	2,640	(568)	3,067
(Loss) gain from available-for-sale investments—net		83	158	118	128
Total (loss) gain on seed investments		$ (194)	$ 3,815	$ (175)	$ 4,005
Number of new funds seeded | new_funds_seeded		1	0	2	0
SICAV Preferred
Trading Securities and Other Trading Assets [Line Items]
Trading investments		$ 58,499		$ 58,499		0
Equity method investments		0		0		0
Gain (loss) from trading investments—net		358	$ 0	358	$ 0
ACOM
Trading Securities and Other Trading Assets [Line Items]
Trading investments		0		0		0
Equity method investments		5,795		5,795		6,371
Equity in earnings (losses) of affiliates		$ (274)	791	$ (576)	867
Ownership percentage range		10.00%		10.00%
CDF
Trading Securities and Other Trading Assets [Line Items]
Trading investments		$ 7,139		$ 7,139		5,702
Equity method investments		0		0		0
Gain (loss) from trading investments—net		(420)	879	(845)	979
GLI SICAV
Trading Securities and Other Trading Assets [Line Items]
Trading investments		5,684		5,684		5,069
Equity method investments		0		0		0
Gain (loss) from trading investments—net		173	183	574	575
GRP-CIP
Trading Securities and Other Trading Assets [Line Items]
Trading investments		2,234		2,234		1,918
Equity method investments		0		0		0
Gain (loss) from trading investments—net		(109)	(45)	188	25
LPX
Trading Securities and Other Trading Assets [Line Items]
Gain (loss) from trading investments—net		0	0	0	(769)
Equity in earnings (losses) of affiliates		0	228	0	474
MLO
Trading Securities and Other Trading Assets [Line Items]
Equity in earnings (losses) of affiliates		0	1,618	0	1,737
GRP-TE
Trading Securities and Other Trading Assets [Line Items]
Trading investments		0		0		0
Equity method investments		97		97		$ 88
Equity in earnings (losses) of affiliates		$ (5)	$ 3	$ 8	$ (11)
Ownership percentage range		0.20%		0.20%
[1]	Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2017 and December 31, 2016 attributable to Cohen & Steers SICAV Global Listed Infrastructure Fund, Cohen & Steers SICAV Global Preferred Securities Fund and Cohen & Steers Co-Investment Partnership, L.P., which were variable interest entities as of June 30, 2017 and December 31, 2016, respectively.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.
[3]	Includes net income (loss) attributable to redeemable noncontrolling interest for the periods presented.

Investments Variable Interest E

Investments Variable Interest Entity (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Trading investments	[1],[2]	$ 73,556	$ 12,689
Due from broker	[1]	14,452	1,579
Other Assets	[1]	6,890	7,382
Total assets		397,883	333,728
Due to broker	[1]	11,835	0
Other liabilities and accrued expenses	[1]	9,753	9,672
Total liabilities		62,411	67,061
GLI SICAV, GRP-CIP and SICAV Preferred [Member]
Variable Interest Entity [Line Items]
Trading investments		66,417	6,987
Due from broker		12,989	475
Other Assets		832	43
Total assets		80,238
Due to broker		11,835	0
Other liabilities and accrued expenses		121	75
Total liabilities		11,956
SICAV Preferred
Variable Interest Entity [Line Items]
Trading investments		58,499
Due from broker		12,582
Other Assets		788
Total assets		71,869
Due to broker		11,776
Other liabilities and accrued expenses		70
Total liabilities		11,846
GRP-CIP
Variable Interest Entity [Line Items]
Trading investments		2,234	1,918
Due from broker		198	294
Other Assets		0	0
Total assets		2,432	2,212
Due to broker		0	0
Other liabilities and accrued expenses		5	5
Total liabilities		5	5
GLI SICAV and GRP-CIP [Member]
Variable Interest Entity [Line Items]
Trading investments			6,987
Due from broker			475
Other Assets			43
Total assets			7,505
Due to broker			0
Other liabilities and accrued expenses			75
Total liabilities			75
GLI SICAV
Variable Interest Entity [Line Items]
Trading investments		5,684	5,069
Due from broker		209	181
Other Assets		44	43
Total assets		5,937	5,293
Due to broker		59	0
Other liabilities and accrued expenses		46	70
Total liabilities		$ 105	70
SICAV Preferred
Variable Interest Entity [Line Items]
Trading Security, Ownership Percentage		26.00%
Trading investments		$ 58,499	$ 0
[1]	Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2017 and December 31, 2016 attributable to Cohen & Steers SICAV Global Listed Infrastructure Fund, Cohen & Steers SICAV Global Preferred Securities Fund and Cohen & Steers Co-Investment Partnership, L.P., which were variable interest entities as of June 30, 2017 and December 31, 2016, respectively.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.

Investments Available-for-Sale

Investments Available-for-Sale Invsetments (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
Available-for-sale Investments [Abstract]
Cost		$ 26,750			$ 26,750			$ 33,891
Gross Unrealized Gains		1,831			1,831			1,962
Gross Unrealized Losses		(324)	[1]		(324)	[1]		(457)	[2]
Fair Value		28,257			28,257			35,396
Available-for-sale investments in an unrealized loss position		5,545			5,545			18,521
Proceeds from Investing Activities [Abstract]
Proceeds from sales		13,024		$ 3,464	19,910		$ 5,419
Gross realized gains		216		321	314		471
Gross realized losses		(133)		$ (163)	(196)		$ (343)
Preferred securities
Available-for-sale Investments [Abstract]
Cost		993			993			1,020
Gross Unrealized Gains		47			47			13
Gross Unrealized Losses		0	[1]		0	[1]		(22)	[2]
Fair Value		1,040			1,040			1,011
Common stocks
Available-for-sale Investments [Abstract]
Cost		8,654			8,654			4,639
Gross Unrealized Gains		489			489			194
Gross Unrealized Losses		(276)	[1]		(276)	[1]		(325)	[2]
Fair Value		8,867			8,867			4,508
Company-sponsored funds
Available-for-sale Investments [Abstract]
Cost		13,376			13,376			28,232
Gross Unrealized Gains		1,265			1,265			1,755
Gross Unrealized Losses		(24)	[1]		(24)	[1]		(110)	[2]
Fair Value		14,617			14,617			$ 29,877
Fixed income securities
Available-for-sale Investments [Abstract]
Cost		3,627			3,627
Gross Unrealized Gains		17			17
Gross Unrealized Losses	[1]	(24)			(24)
Fair Value		3,620			3,620
Other Investments
Available-for-sale Investments [Abstract]
Cost		100			100
Gross Unrealized Gains		13			13
Gross Unrealized Losses	[1]	0			0
Fair Value		$ 113			$ 113
[1]	At June 30, 2017, there were no securities with material unrealized losses continuously for a period of more than 12 months.
[2]	At December 31, 2016, there were no securities with unrealized losses continuously for a period of more than 12 months.

Fair Value (Details)

Fair Value (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment redemption, notice period		5 days	5 days
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments	[1],[2]	$ 73,556	$ 12,689		$ 73,556		$ 12,689
Equity method investments		5,892	6,459		5,892		6,459
Available-for-sale investments		28,257	35,396		28,257		35,396
Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		113			113
Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		8,867	4,508		8,867		4,508
Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		3,620			3,620
Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		1,040	1,011		1,040		1,011
Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		14,617	29,877		$ 14,617		$ 29,877
Level 3 | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Inputs, Discount rates					10.00%		11.00%
Fair Value Inputs, Exit capitalization rates					7.50%		8.00%
Fair Value Inputs, Market rental rates					14.50		14
Level 3 | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value Inputs, Discount rates					11.00%		12.50%
Fair Value Inputs, Exit capitalization rates					8.00%		8.50%
Fair Value Inputs, Market rental rates					16.8		17
Level 3 | Limited partnership interests
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3 Fair Value		1,462	1,196		$ 1,462		$ 1,196
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[3]		140,872				140,872
Trading investments			12,689				12,689
Equity method investments			6,459				6,459
Available-for-sale investments			35,396				35,396
Derivative - assets			1,760				1,760
Derivative - liabilities			266				266
Fair Value, Measurements, Recurring | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			343				343
Derivative - liabilities			266				266
Fair Value, Measurements, Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			1,417				1,417
Fair Value, Measurements, Recurring | Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		113			113
Fair Value, Measurements, Recurring | Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		5,684	5,069		5,684		5,069
Available-for-sale investments		8,867	4,508		8,867		4,508
Fair Value, Measurements, Recurring | Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		7,139	5,702		7,139		5,702
Available-for-sale investments		3,620			3,620
Fair Value, Measurements, Recurring | Limited partnership interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		2,234	1,918		2,234		1,918
Fair Value, Measurements, Recurring | Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		58,499			58,499
Available-for-sale investments		1,040	1,011		1,040		1,011
Fair Value, Measurements, Recurring | Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		14,617	29,877		14,617		29,877
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[4]		140,872				140,872
Trading investments			5,069				5,069
Equity method investments			0				0
Available-for-sale investments			35,386				35,386
Derivative - assets			343				343
Derivative - liabilities			266				266
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			343				343
Derivative - liabilities			266				266
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			0				0
Fair Value, Measurements, Recurring | Level 1 | Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0			0
Fair Value, Measurements, Recurring | Level 1 | Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		5,684	5,069		5,684		5,069
Available-for-sale investments		8,867	4,508		8,867		4,508
Fair Value, Measurements, Recurring | Level 1 | Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Available-for-sale investments		0			0
Fair Value, Measurements, Recurring | Level 1 | Limited partnership interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 1 | Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		11,715			11,715
Available-for-sale investments		1,022	1,001		1,022		1,001
Fair Value, Measurements, Recurring | Level 1 | Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		14,617	29,877		14,617		29,877
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[4]		0				0
Trading investments			5,702				5,702
Equity method investments			0				0
Available-for-sale investments			10				10
Derivative - assets			1,417				1,417
Derivative - liabilities			0				0
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			0				0
Derivative - liabilities			0				0
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			1,417				1,417
Fair Value, Measurements, Recurring | Level 2 | Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0			0
Fair Value, Measurements, Recurring | Level 2 | Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Available-for-sale investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 2 | Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		7,139	5,702		7,139		5,702
Available-for-sale investments		3,620			3,620
Fair Value, Measurements, Recurring | Level 2 | Limited partnership interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 2 | Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		46,784			46,784
Available-for-sale investments		18	10		18		10
Fair Value, Measurements, Recurring | Level 2 | Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[4]		0				0
Trading investments			1,196				1,196
Equity method investments			0				0
Available-for-sale investments			0				0
Derivative - assets			0				0
Derivative - liabilities			0				0
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			0				0
Derivative - liabilities			0				0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets			0				0
Fair Value, Measurements, Recurring | Level 3 | Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0			0
Fair Value, Measurements, Recurring | Level 3 | Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Available-for-sale investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 3 | Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0	0		0		0
Available-for-sale investments		0			0
Fair Value, Measurements, Recurring | Level 3 | Limited partnership interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		1,462	1,196		1,462		1,196
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		1,476		$ 1,338	1,196	$ 1,312	1,312
Purchases / contributions		114		21	138	21
Sales / distributions		0		(53)	0	(53)
Realized losses		0		0	0	0
Unrealized (losses) gains	[5]	(128)		(2)	128	24
Transfers into (out of) level 3		0		0	0	0
Balance at end of period		1,462	1,196	$ 1,304	1,462	$ 1,304	1,196
Fair Value, Measurements, Recurring | Level 3 | Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		0			0
Available-for-sale investments		0	0		0		0
Fair Value, Measurements, Recurring | Level 3 | Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0	0		0		0
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[4],[6]	0	0		0		0
Cash equivalents | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[7]	148,846			148,846
Cash equivalents | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[7]	148,846			148,846
Cash equivalents | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[7]	0			0
Cash equivalents | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Cash equivalents	[7]	0			0
Trading investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	772	722		772		722
Trading investments | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		73,556			73,556
Trading investments | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		17,399			17,399
Trading investments | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		53,923			53,923
Trading investments | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Trading investments		1,462			1,462
Fixed income securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Limited partnership interests
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	772	722		772		722
Equity method investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	5,892	6,459		5,892		6,459
Equity method investments | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity method investments		5,892			5,892
Equity method investments | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity method investments		0			0
Equity method investments | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity method investments		0			0
Equity method investments | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity method investments		0			0
Available-for-sale investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	113	0		113		0
Available-for-sale investments | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		28,257			28,257
Available-for-sale investments | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		24,506			24,506
Available-for-sale investments | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		3,638			3,638
Available-for-sale investments | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Available-for-sale investments		0			0
Common stocks
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Preferred securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Other Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	113			113
Company-sponsored funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Derivative - assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Derivative - assets | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Derivative - assets | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Derivative - assets | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		427			427
Derivative - assets | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		344			344
Derivative - assets | Fair Value, Measurements, Recurring | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		83			83
Derivative - assets | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		344			344
Derivative - assets | Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		344			344
Derivative - assets | Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		0			0
Derivative - assets | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		83			83
Derivative - assets | Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		0			0
Derivative - assets | Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		83			83
Derivative - assets | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		0			0
Derivative - assets | Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		0			0
Derivative - assets | Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - assets		0			0
Derivative - liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	0		0		0
Derivative - liabilities | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Investments Measured at NAV	[3]	0	$ 0		0		$ 0
Derivative - liabilities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		287			287
Derivative - liabilities | Fair Value, Measurements, Recurring | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		287			287
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		287			287
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		287			287
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		0			0
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		0			0
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		0			0
Derivative - liabilities | Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Derivative - liabilities		$ 0			$ 0
[1]	Asset and liability amounts in parentheses represent the aggregated balances at June 30, 2017 and December 31, 2016 attributable to Cohen & Steers SICAV Global Listed Infrastructure Fund, Cohen & Steers SICAV Global Preferred Securities Fund and Cohen & Steers Co-Investment Partnership, L.P., which were variable interest entities as of June 30, 2017 and December 31, 2016, respectively.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.
[3]	Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position.
[4]	Comprised of certain investments measured at fair value using NAV (or its equivalent) as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented on the condensed consolidated statement of financial position.
[5]	Pertains to unrealized gains (losses) from securities held at June 30, 2017 and 2016.
[6]	Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV.
[7]	Comprised of investments in actively traded U.S. Treasury money market funds measured at NAV.

Derivatives (Details)

Derivatives (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]
Derivative Assets, Notional		$ 21,777,000		$ 21,777,000		$ 20,377,000
Derivative Assets, Fair Value		427,000		427,000		1,760,000
Derivative Liabilities, Notional		7,441,000		7,441,000		4,825,000
Derivative Liabilities, Fair Value		287,000		287,000		266,000
Derivative, Gains (Losses) on derivative, net		(888,000)	$ 3,538,000	(2,190,000)	$ 2,382,000
Trading investments
Derivative [Line Items]
Cash included in due from broker pledged as collateral	[1]	88,000		88,000
Trading investments and pledged as collateral	[1]	598,000		598,000		487,000
Foreign exchange contracts
Derivative [Line Items]
Derivative Assets, Notional		13,708,000		13,708,000		13,839,000
Derivative Assets, Fair Value		83,000		83,000		1,417,000
Derivative Liabilities, Notional		0		0		0
Derivative Liabilities, Fair Value		0		0		0
Derivative, Gains (Losses) on derivative, net		(479,000)	715,000	(1,334,000)	(541,000)
Commodity contracts
Derivative [Line Items]
Derivative Assets, Notional		8,069,000		8,069,000		6,538,000
Derivative Assets, Fair Value		344,000		344,000		343,000
Derivative Liabilities, Notional		7,441,000		7,441,000		4,825,000
Derivative Liabilities, Fair Value		287,000		287,000		$ 266,000
Derivative, Gains (Losses) on derivative, net		$ (409,000)	$ 2,823,000	$ (856,000)	$ 2,923,000
[1]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Strategy Fund, Inc. as of June 30, 2017 and December 31, 2016, respectively.

Earnings Per Share (Details)

Earnings Per Share (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 Share [Abstract]
Anti-dilutive common stock equivalents excluded from computation (in shares)	0	0	9,000	28,000
Net income	$ 22,998	$ 24,921	$ 45,942	$ 42,788
Less: Net (income) loss attributable to redeemable noncontrolling interest	476	(113)	517	103
Net income attributable to common stockholders	$ 23,474	$ 24,808	$ 46,459	$ 42,891
Basic weighted average shares outstanding (shares)	46,373,000	45,984,000	46,308,000	45,896,000
Dilutive potential shares from restricted stock units (shares)	529,000	394,000	445,000	391,000
Diluted weighted average shares outstanding (shares)	46,902,000	46,378,000	46,753,000	46,287,000
Basic earnings per share attributable to common stockholders (in dollars per share)	$ 0.51	$ 0.54	$ 1	$ 0.93
Diluted earnings per share attributable to common stockholders (in dollars per share)	$ 0.50	$ 0.53	$ 0.99	$ 0.93

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
U.S. Federal, State, Local and Foreign Taxes
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, percent	38.40%	35.50%	37.10%	36.60%

Regulatory Requirements (Detail

Regulatory Requirements (Details) $ in Thousands	Jun. 30, 2017USD ($)
Securities Registered Domestically
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net Capital	$ 3,859
Excess Capital	3,662
Securities Regulated By Foreign Entities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Net Capital	76,290
Excess Capital	$ 72,376

Related Party Transactions (Det

Related Party Transactions (Details) - Affiliated Funds - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transactions, Revenue [Abstract]
Investment advisory and administration fees	$ 60,099	$ 55,817	$ 117,499	$ 107,728
Distribution and service fees	5,104	4,671	10,150	8,904
Total	65,203	60,488	127,649	116,632
Related Party Transactions Summary [Abstract]
Proceeds from sales	10,070	0	15,105	0
Gross realized gains	60	0	80	0
Gross realized losses	0	0	0	0
Dividend income	133	270	388	270
Fund expenses, included in general and administrative expenses	2,731	$ 1,789	5,104	$ 3,823
Receivables due from company-sponsored funds	$ 21,419		$ 21,419		$ 20,221

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loss Contingencies [Line Items]
Operating Leases, Rent Expense	$ 2.8	$ 3	$ 5.6	$ 5.8
Commitments
Loss Contingencies [Line Items]
Long-term purchase commitment, time period			12 years
Commitment to invest
Loss Contingencies [Line Items]
Long-term purchase commitment	5.1		$ 5.1
Long-term committment, funded amount	$ 3.5		$ 3.5

Concentration of Credit Risk (D

Concentration of Credit Risk (Details)	Jun. 30, 2017financial_institution
Risks and Uncertainties [Abstract]
Number of financial institutions	3

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Aug. 03, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Dividends, Common Stock, Cash		$ 0.28	$ 0.26	$ 0.56	$ 0.52
Dividend Declared | Subsequent Event
Subsequent Event [Line Items]
Dividends, Common Stock, Cash	$ 0.28