Cohen & Steers (CNS) 10-Q 8 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2013	Nov. 04, 2013
Entity Information [Line Items]	'	'
Entity Registrant Name	'COHEN & STEERS INC	'
Entity Central Index Key	'0001284812	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	44,251,756

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Financial Condition (Unaudited) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'		'
Cash and cash equivalents	$143,845		$95,412
Securities owned ($26,002) ($8,499 and $849)	11,507	[1],[2]	97,155	[1],[2]
Equity method investments	24,301		8,106
Investments, available-for-sale	13,539		25,322
Accounts receivable	52,726		44,397
Due from broker ($12,358)	1,838	[2]	17,617	[2]
Property and equipment—net	9,387		9,103
Goodwill	20,448		20,122
Intangible assets—net	1,724		1,790
Deferred income tax asset—net	11,279		10,171
Other assets ($103)	6,517	[2]	8,120	[2]
Total assets	297,111		337,315
Liabilities:	'		'
Accrued compensation	19,501		25,845
Securities sold but not yet purchased ($14,685)	0	[2]	14,685	[2]
Income tax payable	8,846		8,836
Other liabilities and accrued expenses ($335)	17,564	[2]	18,181	[2]
Total liabilities	45,911		67,547
Commitments and contingencies	'		'
Redeemable noncontrolling interest	192		53,188
Stockholders’ equity:	'		'
Common stock, $0.01 par value; 500,000,000 shares authorized; 47,729,715 and 47,002,117 shares issued at September 30, 2013 and December 31, 2012, respectively	477		470
Additional paid-in capital	449,568		429,377
Accumulated deficit	-96,483		-117,889
Accumulated other comprehensive income, net of tax	3,119		2,341
Less: Treasury stock, at cost, 3,481,712 and 3,239,093 shares at September 30, 2013 and December 31, 2012, respectively	-105,673		-97,719
Total stockholders’ equity	251,008		216,580
Total liabilities and stockholders’ equity	$297,111		$337,315
[1]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of September 30, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.
[2]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to the Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Financial Condition (Unaudited) Condensed Consolidated Statements of Financial Position (Parenthetical) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Common Stock, Par or Stated Value Per Share	$0.01		$0.01
Common Stock, Shares Authorized	500,000,000		500,000,000
Common Stock, Shares, Issued	47,729,715		47,002,117
Common Stock, Shares, Outstanding	44,248,003		43,763,024
Treasury Stock, Shares	3,481,712		3,239,093
Securities owned	$11,507	[1],[2]	$97,155	[1],[2]
Due from broker	1,838	[2]	17,617	[2]
Other assets	6,517	[2]	8,120	[2]
Securities sold but not yet purchased	0	[2]	14,685	[2]
Other liabilities	17,564	[2]	18,181	[2]
Onshore Fund	'		'
Securities owned	'		26,002
Due from broker	'		12,358
Other assets	'		103
Securities sold but not yet purchased	'		14,685
Other liabilities	'		335
Securitites Owned	'		'
Securities owned and held as collateral	$8,499		$849
[1]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of September 30, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.
[2]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to the Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue:	'	'	'	'
Investment advisory and administration fees	$67,704	$63,224	$203,451	$181,066
Distribution and service fees	3,627	2,881	10,802	8,129
Portfolio consulting and other	2,695	5,191	10,028	13,263
Total revenue	74,026	71,296	224,281	202,458
Expenses:	'	'	'	'
Employee compensation and benefits	24,058	25,101	72,330	69,696
Distribution and service fees	8,362	21,376	33,120	34,148
General and administrative	11,688	10,601	35,384	29,061
Depreciation and amortization	1,423	1,384	4,110	4,218
Amortization, deferred commissions	776	595	2,351	1,636
Total expenses	46,307	59,057	147,295	138,759
Operating income	27,719	12,239	76,986	63,699
Non-operating income:	'	'	'	'
Interest and dividend income—net	218	478	1,507	1,768
Gain (loss) from trading securities—net	2,383	3,999	-6,956	3,251
Gain from available-for-sale securities—net	180	437	1,508	1,040
Equity in earnings of affiliates	313	71	422	714
Other gain (loss)	209	330	-430	-433
Total non-operating income (loss)	3,303	5,315	-3,949	6,340
Income before provision for income taxes	31,022	17,554	73,037	70,039
Provision for income taxes	11,205	4,987	29,210	24,187
Net income	19,817	12,567	43,827	45,852
Less: Net (income) loss attributable to redeemable noncontrolling interest	-1,534	-2,306	4,879	-1,458
Net income attributable to common shareholders	$18,283	$10,261	$48,706	$44,394
Earnings per share attributable to common shareholders:	'	'	'	'
Basic	$0.41	$0.23	$1.10	$1.01
Diluted	$0.41	$0.23	$1.08	$1
Dividends declared per share	$0.20	$0.18	$0.60	$0.54
Weighted average shares outstanding:	'	'	'	'
Basic	44,317	43,822	44,254	43,744
Diluted	45,106	44,537	44,997	44,439

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income attributable to common shareholders	$18,283	$10,261	$48,706	$44,394
Foreign currency translation gain (loss), net of tax of zero	1,233	630	890	-184
Net unrealized gain from available-for-sale securities, net of tax of zero	463	344	1,396	2,336
Reclassification to statements of operations of gain from available-for-sale securities, net of tax of zero	-180	-437	-1,508	-1,040
Total comprehensive income attributable to common shareholders	$19,799	$10,798	$49,484	$45,506

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of changes in Stockholders' Equity and Redeemable Noncontrolling Interest (Unaudited) (USD $)	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
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2011	'	'	'	'	'	'	'	$4,796,000
Beginning balance at Dec. 31, 2011	'	462,000	402,573,000	-83,063,000	-225,000	-89,235,000	230,512,000	'
Shares of common stock, net, beginning total at Dec. 31, 2011	'	43,168,279	'	'	'	'	'	'
Dividends	'	0	0	-24,238,000	0	0	-24,238,000	0
Issuance of common stock	'	8,000	402,000	0	0	0	410,000	0
Issuance of common stock, Shares	839,929	'	'	'	'	'	'	'
Repurchase of common stock	'	0	0	0	0	-8,477,000	-8,477,000	0
Repurchase of common stock, Shares	-251,946	'	'	'	'	'	'	'
Tax benefits associated with restricted stock units - net	'	0	2,947,000	0	0	0	2,947,000	0
Issuance of restricted stock units	616,000	0	1,399,000	0	0	0	1,399,000	0
Amortization of restricted stock units - net	'	0	13,053,000	0	0	0	13,053,000	0
Forfeitures of vested restricted stock units	'	0	-1,000	0	0	0	-1,000	'
Net Income (loss)	45,852,000	0	0	44,394,000	0	0	44,394,000	1,458,000
Other comprehensive income, net of tax	'	0	0	0	1,112,000	0	1,112,000	0
Distributions to redeemable noncontrolling interest	'	0	0	0	0	0	0	3,647,000
Contributions from redeemable noncontrolling interest	'	0	0	0	0	0	'	44,118,000
Foreign currency translation adjustment on reeemable noncontrolling Interest	'	0	0	0	0	0	0	44,000
Redeemable noncontrolling interest, ending balance at Sep. 30, 2012	'	'	'	'	'	'	'	46,769,000
Ending balance at Sep. 30, 2012	'	470,000	420,373,000	-62,907,000	887,000	-97,712,000	261,111,000	'
Shares of common stock, net, ending total at Sep. 30, 2012	'	43,756,000	'	'	'	'	'	'
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2012	'	'	'	'	'	'	'	53,188,000
Beginning balance at Dec. 31, 2012	216,580,000	470,000	429,377,000	-117,889,000	2,341,000	-97,719,000	216,580,000	'
Shares of common stock, net, beginning total at Dec. 31, 2012	43,763,024	43,763,024	'	'	'	'	'	'
Dividends	'	0	0	-27,300,000	0	0	-27,300,000	0
Issuance of common stock	'	7,000	388,000	0	0	0	395,000	0
Issuance of common stock, Shares	727,598	'	'	'	'	'	'	'
Repurchase of common stock	'	0	0	0	0	-7,954,000	-7,954,000	0
Repurchase of common stock, Shares	-242,619	'	'	'	'	'	'	'
Tax benefits associated with restricted stock units - net	'	0	2,231,000	0	0	0	2,231,000	0
Issuance of restricted stock units	742,000	0	1,456,000	0	0	0	1,456,000	0
Amortization of restricted stock units - net	'	0	16,126,000	0	0	0	16,126,000	0
Forfeitures of vested restricted stock units	'	0	10,000	0	0	0	10,000	0
Net Income (loss)	43,827,000	0	0	48,706,000	0	0	48,706,000	-4,879,000
Other comprehensive income, net of tax	'	0	0	0	778,000	0	778,000	0
Distributions to redeemable noncontrolling interest	'	0	0	0	0	0	0	-14,242,000
Contributions from redeemable noncontrolling interest	'	0	0	0	0	0	'	37,711,000
Transfer of redeemable noncontrolling interest in consolidated entity	-71,586,000	0	0	0	0	0	0	71,586,000
Redeemable noncontrolling interest, ending balance at Sep. 30, 2013	'	'	'	'	'	'	'	192,000
Ending balance at Sep. 30, 2013	$251,008,000	$477,000	$449,568,000	($96,483,000)	$3,119,000	($105,673,000)	$251,008,000	'
Shares of common stock, net, ending total at Sep. 30, 2013	44,248,003	44,248,003	'	'	'	'	'	'

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows - (Continued) (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$43,827	$45,852
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'	'
Stock compensation expense	16,186	13,101
Amortization, deferred commissions	2,351	1,636
Depreciation and amortization	4,110	4,218
Deferred rent	1,465	226
Loss (gain) from trading securities—net	6,956	-3,251
Equity in earnings of affiliates	-422	-714
Gain from available-for-sale securities, net	-1,508	-1,040
Deferred income taxes	-1,110	1,954
Foreign currency loss (gain)	313	-1,398
Changes in operating assets and liabilities:	'	'
Accounts receivable	-8,642	-20,181
Due from broker	-7,758	-6,349
Deferred commissions	-2,096	-2,328
Securities owned	-7,756	-58,948
Other assets	2,294	-1,295
Accrued compensation	-5,865	-295
Securities sold but not yet purchased	-14,685	2,273
Income tax payable	245	-1,790
Other liabilities and accrued expenses	13,177	6,589
Net cash provided by (used in) operating activities	41,082	-21,740
Cash flows from investing activities:	'	'
Proceeds from redemptions of equity method investments	7,746	811
Purchases of investments, available-for-sale	-8,179	-18,535
Proceeds from sales of investments, available-for-sale	20,244	23,720
Purchases of property and equipment	-4,327	-2,357
Net cash provided by investing activities	15,484	3,639
Cash flows from financing activities:	'	'
Excess tax benefits associated with restricted stock units	1,994	2,843
Issuance of common stock	336	357
Repurchase of common stock	-7,954	-8,477
Dividends to stockholders	26,558	23,622
Redemptions of redeemable noncontrolling interest	-14,242	-3,647
Contributions from redeemable noncontrolling interest	37,711	44,118
Net cash (used in) provided by financing activities	-8,713	11,572
Net increase (decrease) in cash and cash equivalents	47,853	-6,529
Effect of foreign exchange rate changes	580	-55
Cash and cash equivalents, beginning of the period	95,412	127,824
Cash and cash equivalents, end of the period	$143,845	$121,240

Condensed_Consolidated_Stateme6

Condensed Consolidated Statements of Cash Flows - (Continued) (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Taxes Paid, Net	$28,288,000	$21,301,000
Fully Vested Restricted Stock Units Issued	714,000	783,000
Dividend Equivalents Declared	742,000	616,000
Transfer of redeemable noncontrolling interest in consolidated entity	71,586,000	'
Non cash increase in equity method investments	$23,519,000	'

Organization_and_Description_o

Organization and Description of Business	9 Months Ended
	Sep. 30, 2013
Organization and Description of Business [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 was formed to be the holding company for Cohen & Steers Capital Management, Inc. (“CSCM”), a New York corporation, and to allow for the issuance of common stock to the public.
	The condensed consolidated financial statements set forth herein include the accounts of CNS and its direct and indirect subsidiaries. CNS’s wholly-owned subsidiaries are CSCM, Cohen & Steers Securities, LLC (“Securities”), Cohen & Steers Asia Limited and Cohen & Steers UK Limited; Cohen & Steers Europe S.P.R.L. is a wholly-owned subsidiary of Cohen & Steers UK Limited (collectively, the “Company”). All material intercompany balances and transactions have been eliminated in consolidation.
	Through CSCM, a registered investment adviser under the Investment Advisers Act of 1940 (the “Advisers Act”), the Company serves institutional and individual investors around the world. Founded in 1986, the Company is a leading global investment manager with a long history of innovation and a focus on real assets, including real estate, infrastructure and commodities. Its clients include Company-sponsored open-end and closed-end mutual funds, U.S. and non-U.S. pension plans, endowment funds, foundations and subadvised funds for other financial institutions. Through Securities, its registered broker/dealer, the Company provides distribution services for certain of its funds.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Basis of Presentation and Significant Accounting Policies [Abstract]	'
Basis of Presentation and Significant Accounting Policies	'
	Basis of Presentation and Significant Accounting Policies
	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, 2012.
	Accounting Estimates—The preparation of the condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and 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.
	Reclassifications—Certain prior year amounts have been reclassified to conform to the current year presentation.
	Consolidation—The Company consolidates operating entities deemed to be voting interest entities if the Company owns a majority of the voting interest. The equity method of accounting is used for investments in non-controlled affiliates in which the Company’s ownership ranges from 20 to 50 percent, or in instances in which the Company is able to exercise significant influence but not control. The Company also consolidates any variable interest entities (“VIEs”) in which the Company is the primary beneficiary. The Company provides for noncontrolling interests in consolidated subsidiaries for which the Company’s ownership is less than 100 percent.
	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 the obligation to absorb a majority of the expected losses or the right to receive the majority of the residual returns. 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 entities in which it has an interest are VIEs upon initial involvement and at each reporting date. 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. See Note 4 for further discussion about the Company’s 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 Broker—The Company conducts business, primarily through 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 agreements with prime brokers. The due from broker balance represents cash and cash equivalents balances at brokers and net receivables and payables for unsettled security 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.
	Securities owned and securities sold but not yet purchased are classified as trading securities 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 the Company’s valuation committee. Unrealized gain and loss are recorded as gain (loss) from trading securities—net reported in the Company’s condensed consolidated statements of operations.
	Investments classified as equity method investments are accounted for using the equity method, under which the Company recognizes its respective share of the investee’s net income or loss for the period. As of September 30, 2013, the Company's equity method investments consisted of interests in funds which measure their underlying investments at fair value 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, investment-grade preferred instruments and investments in Company-sponsored open-end and closed-end mutual funds. 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 gain and loss, 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, the loss will be recognized in the Company’s condensed consolidated statements of operations. An other than temporary impairment is generally presumed to have occurred if the available-for-sale investment has an unrealized loss continuously for 12 or more months.
	From time to time, the 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 with gain and loss recorded as gain (loss) from trading securities—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 in the Company's condensed consolidated statements of financial condition.
	Additionally, from time to time, the Company enters into foreign exchange contracts to hedge its currency exposure related to client receivables. These instruments are measured at fair value with gain and loss recorded in other non-operating income 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 in 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 mutual funds. This revenue is earned pursuant to the terms of the underlying advisory contract, and is based on a contractual investment advisory fee applied to the assets in the client’s portfolio, net of applicable waivers. The Company also earns revenue from administration fees paid by certain Company-sponsored open-end and closed-end mutual funds, based on the average assets under management of such funds. This revenue is recognized as such fees are earned.
	Distribution and Service Fees—Distribution and service fee revenue is earned as the services are performed, based on contractually-predetermined percentages of the average assets under management of the Company-sponsored open-end load mutual funds. Distribution and service fee revenue is recorded gross of any third-party distribution and service fee expense arrangements. The expenses associated with these third-party distribution and service fee arrangements are recorded as incurred. During the first quarter of 2013 and the third quarter of 2012, the Company made payments of approximately $7.2 million and $14.4 million, respectively, associated with additional compensation agreements entered into in connection with the offering of two closed-end mutual funds. These payments were reflected as expenses in distribution and service fees on the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2013 and September 30, 2012.
	Portfolio Consulting and Other—The Company earns portfolio consulting and other fees by: i) providing portfolio consulting services in connection with model-based strategies accounts; ii) earning a licensing fee for the use of the Company's proprietary indices; 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 granted to employees. This expense is recognized over the period during which employees are required to provide service. The Company also estimates forfeitures.
	Income Taxes—The Company records the current and deferred tax consequences of all transactions that have been recognized in the 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. Deferred tax liabilities are recognized for temporary differences that will result in taxable income in future 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.
	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 are translated at average exchange rates during the period. The gain or loss resulting from translating non-U.S. dollar functional currency into U.S. dollars is included in the Company's condensed consolidated statements of comprehensive income. Gain or loss resulting from non-U.S. dollar currency transactions is included in other non-operating income in the condensed consolidated statements of operations.
	Comprehensive Income—The Company reports all changes in comprehensive income in the condensed consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common shareholders, unrealized gain and loss from available-for-sale securities (net of tax), foreign currency translation gain and loss (net of tax) and reclassification to statements of operations of gain and loss from available-for-sale securities (net of tax).
	Recently Issued Accounting Pronouncements—In July 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance on the presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryfoward exists. An entity is required to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward unless a net operating loss carryforward, a similar tax loss or a tax credit carryforward is not available as of the reporting date or the entity does not intend to use the deferred tax asset for this purpose (provided that the tax law permits a choice). This new guidance will be effective for the Company's first quarter of 2014. The Company does not anticipate that the adoption of this new guidance will have a material impact on the Company's condensed consolidated financial statements.
	In February 2013, the FASB issued new guidance requiring an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. An entity is also required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In January 2013, the FASB issued new guidance to clarify the scope of the offsetting disclosures associated with derivative and hedging transactions, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In October 2012, the FASB issued new guidance to make certain technical corrections to the FASB Accounting Standards Codification ("Codification"), which identifies when the use of fair value should be linked to the definition of fair value in Codification Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). The amendments affect various Codification topics and include source literature amendments, guidance clarification and reference corrections and relocated guidance. The amendments that will not have transition guidance were effective upon issuance and the amendments that are subject to the transition guidance were effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In July 2012, the FASB issued new guidance to simplify how entities test indefinite-lived intangible assets for impairment. The new guidance permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount as a basis for determining whether it is necessary to perform the second step to measure the amount of the impairment loss, if any. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In December 2011, the FASB issued new guidance to create new disclosure requirements about the nature of an entity's rights of offset and related arrangements associated with its financial instruments and derivative instruments. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets [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 September 30, 2013 and December 31, 2012, goodwill was approximately $20,448,000 and $20,122,000, respectively. The Company’s goodwill increased by $326,000 in the nine months ended September 30, 2013 as a result of foreign currency revaluation.
	Intangible Assets
	The following table details the gross carrying amounts and accumulated amortization for the intangible assets at September 30, 2013 and December 31, 2012 (in thousands):
		Remaining		Gross		Accumulated			Intangible
		Amortization		Carrying		Amortization			Assets, Net
		Period		Amount
		(in months)
	September 30, 2013:
	Amortized intangible assets:
	Client relationships	63		$	1,543	$	(1,069	)	$	474
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250		—			1,250
	Total			$	2,793	$	(1,069	)	$	1,724
	December 31, 2012:
	Amortized intangible assets:
	Client relationships	72		$	1,543	$	(1,003	)	$	540
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250		—			1,250
	Total			$	2,793	$	(1,003	)	$	1,790
	Amortization expense related to the intangible assets was approximately $22,000 for both the three months ended September 30, 2013 and 2012, respectively, and approximately $66,000 for both the nine months ended September 30, 2013 and 2012, respectively. Estimated future amortization expense is as follows (in thousands):
	Periods Ending December 31,	Estimated
		Amortization
		Expense
	2013	$	23
	2014	89
	2015	89
	2016	89
	2017	89
	Thereafter	95
	Total	$	474

Investments_Investments

Investments Investments	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Investment Holdings	'
	Investments
	The following is a summary of the Company's investments as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30,			December 31, 2012
		2013
	Securities owned	$	11,507		$	97,155
	Equity method investments	24,301			8,106
	Investments, available-for-sale	13,539			25,322
	Trading and equity method investments
	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 manager of ACOM for which it receives a management fee. As of September 30, 2013, the Company owned all of the voting interest in ACOM. Accordingly, the underlying assets and liabilities and results of operations of ACOM 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 manager 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 deemed the primary beneficiary. As the general partner, the Company has significant influence over the financial decisions of GRP-TE and therefore records its investment in this fund using the equity method of accounting. The Company's equity interest in GRP-TE represents a seed investment to launch the fund which was made during the first quarter of 2012, adjusted for the Company’s proportionate share of the fund’s earnings. As of September 30, 2013, the fair value of the Company's equity interest in GRP-TE was approximately $105,000. 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. As of September 30, 2013, the Company owned 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.
	During 2008, the Company launched the Cohen & Steers Global Real Estate Long-Short Fund, L.P. (the “Onshore Fund”) which is structured as a partnership. The Company is the general partner and investment manager of the Onshore Fund. As of September 30, 2013, the Company owned the majority of the voting interest in the Onshore Fund. Accordingly, the underlying assets and liabilities and results of operations of the Onshore Fund have been included in the Company's condensed consolidated financial statements with the third party interests classified as redeemable noncontrolling interest. The Onshore Fund had been identified as a VIE and the Company was the primary beneficiary until March 31, 2013. During April 2013, the unaffiliated limited partner redeemed all of its partnership interest from the Onshore Fund, which left the Company, with affiliated employees, owning 100% of the voting interests. As a result, the Onshore Fund is no longer a VIE because the interest holders' voting rights are proportionate with their rights to receive returns or obligation to absorb losses. The Onshore Fund continues to be consolidated.
	The following represents the portion of the condensed consolidated statements of financial condition attributable to the consolidated Onshore Fund as of December 31, 2012. As of December 31, 2012, the following assets were available only to settle obligations of the Onshore Fund and these liabilities were only the obligations of the Onshore Fund for which the creditors did not have recourse to the general credit of the Company (in thousands):
		31-Dec-12
	Assets:
	Securities owned	$	26,002
	Due from broker	12,358
	Other assets	103
	Total assets	$	38,463
	Liabilities:
	Securities sold but not yet purchased	$	14,685
	Other liabilities	335
	Total liabilities	$	15,020
	The Cohen & Steers Global Real Estate Long-Short Offshore Fund, L.P. (the “Offshore Fund”), launched by the Company in 2008, is structured as a partnership. The Company is the general partner and investment manager of the Offshore Fund for which it receives a management fee and is entitled to receive a performance fee, if earned. The Company determined that the Offshore Fund was not a VIE. The limited partners, unaffiliated with the Company, have the ability to dissolve the fund with a majority vote. As a result, the Company does not have financial control and the Offshore Fund is not consolidated into the Company's condensed consolidated financial statements. As the general partner, the Company has significant influence over the financial decisions of the Offshore Fund and therefore records its investment in this fund using the equity method of accounting. The Company’s equity interest in the Offshore Fund represents a seed investment to launch the fund, adjusted for the Company’s proportionate share of the fund’s earnings.
	RAP, which was launched by the Company on January 31, 2012, is an open-end mutual fund for which the Company is the investment manager. The Company had a controlling financial interest in RAP through July 31, 2013 and therefore, the underlying assets and liabilities and results of operations of RAP had been included in the Company's condensed 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 August 1, 2013, the Company no longer held a controlling financial interest in RAP, however it was determined that the Company had significant influence over RAP. Accordingly, effective August 1, 2013, the Company records its investment in RAP using the equity method of accounting. The Company did not record any gain or loss as a result of deconsolidation.
	Prior to the sale of the Company's remaining interest in Cohen & Steers Global Listed Infrastructure Fund (“GLIF”) during June 2012, the Company owned the majority of the voting interest in GLIF. Accordingly, the results of operations of GLIF had been included in the Company's condensed consolidated financial statements for the nine months ended September 30, 2012.
	The following is a summary of the fair value of securities owned and equity method investments as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013						December 31, 2012
		Securities Owned			Equity Method Investments			Securities Owned			Equity Method Investments
	ACOM	$	8,500		$	—		$	—		$	—
	GRP-CIP	2,583			—			2,142			—
	GRP-TE	—			105			—			89
	Offshore Fund	—			376			—			8,017
	Onshore Fund	424			—			26,002			—
	RAP	—			23,820			69,011			—
	Total	$	11,507		$	24,301		$	97,155		$	8,106
	Gain (loss) from trading securities—net for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	ACOM	$	123		$	—		$	(503	)	$	—
	GLIF	—			—			—			142
	GRP-CIP	287			—			264			9
	Onshore Fund	(104		)	67			417			1,921
	RAP	2,077			3,932			(7,134		)	1,179
	Total gain (loss) from trading securities—net	$	2,383		$	3,999		$	(6,956	)	$	3,251
	Equity in earnings (losses) of affiliates for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	GRP-TE	$	7		$	—		$	7		$	—
	Offshore Fund	5			71			114			714
	RAP	301			—			301			—
	Total equity in earnings of affiliates	$	313		$	71		$	422		$	714
	Available-for-sale
	The following is a summary of the cost, gross unrealized gain, gross unrealized loss and fair value of investments, available-for-sale as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
					Gain			Loss <
								12 months
	Preferred securities	$	4,135		$	211		$	(41	)	$	4,305
	Common stocks	7,977			1,241			(176		)	9,042
	Company-sponsored mutual funds	199			—			(7		)	192
Total investments, available-for-sale	$	12,311		$	1,452		$	(224	)	$	13,539
	December 31, 2012
	Cost			Gross			Gross			Fair
				Unrealized			Unrealized			Value
				Gain			Loss <
							12 months
Preferred securities	$	4,351		$	70		$	(82	)	$	4,339
Common stocks	9,490			1,147			(249		)	10,388
Company-sponsored mutual funds	10,100			495			—			10,595
Total investments, available-for-sale	$	23,941		$	1,712		$	(331	)	$	25,322
Unrealized loss on investments, available-for-sale as of September 30, 2013 was generally caused by market conditions. When evaluating whether an unrealized loss on an investment, available-for-sale is other than temporary, the Company reviews such factors as extent and duration of the loss, deterioration in the issuer’s credit quality, reduction or cessation of dividend payments and overall financial strength of the issuer. As of September 30, 2013, the Company determined that it had the ability and intent to hold the remaining 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 gain and gross realized loss from investments, available-for-sale for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Proceeds from sales	$	3,570		$	7,005		$	21,326		$	24,166
Gross realized gain	283			562			1,846			1,704
Gross realized loss	(103		)	(125		)	(338		)	(664		)

Fair_Value

Fair Value	9 Months Ended
	Sep. 30, 2013
Fair Value [Abstract]	'
Fair Value	'
	Fair Value
	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 in active markets.
	•	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 at the beginning of the reporting period.
	The following table presents fair value measurements as of September 30, 2013 (in thousands):
		Level 1			Level 2			Level 3			Total
	Cash equivalents*	$	59,422		$	—		$	—		$	59,422
	Securities owned
	Common stocks	$	—		$	—		$	424		$	424
	Fixed income securities	—			8,500			—			8,500
	Limited partnership interests	—			—			2,583			2,583
	Total securities owned	$	—		$	8,500		$	3,007		$	11,507
	Equity method investments	$	23,820		$	—		$	481		$	24,301
	Investments, available-for-sale
	Preferred securities	$	951		$	—		$	3,354		$	4,305
	Common stocks	9,042			—			—			9,042
	Company-sponsored mutual funds	192			—			—			192
	Total investments, available-for-sale	$	10,185		$	—		$	3,354		$	13,539
	Derivatives - assets
	Foreign exchange contracts	$	—		$	109		$	—		$	109
	Commodity contracts	230			—			—			230
	Total derivatives - assets	$	230		$	109		$	—		$	339
	Derivatives - liabilities
	Foreign exchange contracts	$	—		$	187		$	—		$	187
	Commodity contracts	263			—			—			263
	Total derivatives - liabilities	$	263		$	187		$	—		$	450
	_________________________
	*    Comprised of investments in money market funds.
	Approximately $16,744,000 of securities owned classified as level 2 at December 31, 2012 were transferred to level 1 securities during the nine months ended September 30, 2013. These securities were primarily comprised of investments in foreign common stocks valued at foreign exchange closing prices with no adjustments required for subsequent events or market movements.
	Approximately $7,436,000 of equity method investments classified as level 2 at June 30, 2013 were transferred to level 3 securities during the three months ended September 30, 2013 due to the imposition of redemption restrictions on the Company's investment in connection with the winding down of operations of the Offshore Fund.
	Securities owned classified as level 2 in the above table was primarily comprised of investments in United States Treasury Bills carried at amortized cost, which approximates fair value.
	Securities owned classified as level 3 in the above table were comprised of investments in the common stock of a privately held bank holding company and limited partnership interests. The investments in the common stock of a privately held bank holding company were valued by the Company's valuation committee using a market approach which utilized market multiples derived from a set of comparable public companies. The limited partnership interests represent the Company's co-investments through GRP-CIP, which along with the Company's interest in GRP-TE, represent the Company's collective ownership interests in limited partnership vehicles that invest in private real estate funds which are valued based on the net asset values of the underlying funds and direct investments in real estate which are generally valued using a discounted cash flow model. The methodology used to value the investments held by GRP-CIP was changed during the nine months ended September 30, 2013 as the transaction cost was no longer a reasonable approximation of value due to the passage of time.
	Equity method investments classified as level 3 in the above table represent the carrying amount of partnership interests in the Offshore Fund and GRP-TE, which approximate their fair value based on each fund's net asset value. The Offshore Fund made long and short investments in listed real estate equity securities to maximize absolute and risk-adjusted returns with modest volatility. GRP-TE invests in non-registered real estate funds and in private equity vehicles that invest directly in real estate. As of September 30, 2013, the Company does not have the ability to redeem its investment in either fund.
	Investments, available-for-sale classified as level 3 in the above table were comprised of an auction rate preferred security. The auction rate preferred security was measured at fair value using a third party pricing service which utilizes a combination of a market approach based on the quoted prices for identical or similar instruments in markets that are not active and an income approach in which the expected cash flows of the securities were discounted back to the measurement date. The Company reviews the fair value provided by the pricing service and confirms its understanding of the methodology utilized.
	The following table presents fair value measurements as of December 31, 2012 (in thousands):
		Level 1			Level 2			Level 3			Total
	Cash equivalents*	$	20,204		$	—		$	—		$	20,204
	Due from broker*	$	3,950		$	—		$	—		$	3,950
	Securities owned
	Preferred securities	$	1,418		$	1,505		$	—		$	2,923
	Common stocks	51,354			16,744			1,168			69,266
	Fixed income securities	—			22,824			—			22,824
	Limited partnership interests	—			—			2,142			2,142
	Total securities owned	$	52,772		$	41,073		$	3,310		$	97,155
	Equity method investments	$	—		$	8,017		$	89		$	8,106
	Investments, available-for-sale
	Preferred securities	$	1,254		$	5		$	3,080		$	4,339
	Common stocks	10,388			—			—			10,388
	Company-sponsored mutual funds	10,595			—			—			10,595
	Total investments, available-for-sale	$	22,237		$	5		$	3,080		$	25,322
	Derivatives - assets
	Equity contracts	$	51		$	52		$	—		$	103
	Foreign exchange contracts	—			616			—			616
	Commodity contracts	336			—			—			336
	Total derivatives - assets	$	387		$	668		$	—		$	1,055
	Derivatives - liabilities
	Equity contracts	$	4		$	111		$	—		$	115
	Commodity contracts	492			—			—			492
	Credit contracts	—			20			—			20
	Total derivatives - liabilities	$	496		$	131		$	—		$	627
	Securities sold but not yet purchased - common stocks	$	14,685		$	—		$	—		$	14,685
_________________________
*    Comprised of investments in money market funds.
Securities owned classified as level 2 in the above table were primarily comprised of investments in United States Treasury Bills carried at amortized cost, which approximates fair value, and foreign common stocks valued at foreign exchange closing prices, adjusted for subsequent significant events or market movements.
Securities owned classified as level 3 in the above table were comprised of investments in the common stock of a privately held bank holding company and limited partnership interests. The investments in the common stock of a privately held bank holding company were valued by the Company's valuation committee using a market approach which utilized market multiples derived from a set of comparable public companies. The limited partnership interests represent the Company's co-investments through GRP-CIP, which along with the Company's interests in GRP-TE, represent the Company's collective ownership interests in private equity vehicles that invest directly in U.S. commercial real estate and were valued primarily based on the recent transaction value of the underlying investments.
Equity method investments classified as level 2 in the above table primarily represent the carrying amount of partnership interests in the Offshore Fund, which approximates its fair value based on the fund's net asset value. The fund made long and short investments in listed real estate equity securities to maximize absolute and risk-adjusted returns with modest volatility. The Company had the ability to redeem its investment in the fund monthly at net asset value per share with prior written notice of 30 days and there were no significant restrictions to redemption.
Investments, available-for-sale classified as level 3 in the above table were comprised of an auction rate preferred security which was measured at fair value using a third party pricing service which utilizes a combination of a market approach based on the quoted prices for identical or similar instruments in markets that are not active and an income approach in which the expected cash flows of the securities were discounted back to the measurement date. The Company reviews the fair value provided by the pricing service and confirms its understanding of the methodology utilized.
The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and nine months ended September 30, 2013 (in thousands):
	Three Months Ended													Nine Months Ended
	30-Sep-13													30-Sep-13
	Securities						Equity Method Investments			Investments, available-for-sale				Securities							Equity Method Investments			Investments, available-for-sale
	Owned													Owned
	Common Stocks			Limited Partnership Interests			GRP-TE/Offshore Fund			Preferred Securities				Common Stocks				Limited Partnership Interests			GRP-TE/Offshore Fund			Preferred Securities
Balance at beginning of period	$	413		$	2,210		$	96		$	3,092			$	1,168			$	2,142		$	89		$	3,080
Purchases / contributions	—			115			3			—				—				318			10			—
Sales / distributions	—			(28		)	(7,066		)	—				(419		)		(141		)	(7,066		)	—
Realized gain (loss)	—			11			—			—				(211		)		11			—			—
Unrealized gain (loss) *	11			275			12			262				(114		)		253			12			274
Transfers into level 3	—			—			7,436			—				—				—			7,436			—
Balance at end of period	$	424		$	2,583		$	481		$	3,354			$	424			$	2,583		$	481		$	3,354
_________________________
*    Pertains to unrealized gain (loss) from securities held at September 30, 2013.
The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and nine months ended September 30, 2012 (in thousands):
	Three Months Ended													Nine Months Ended
	30-Sep-12													30-Sep-12
	Securities						Equity Method Investments			Investments, available-for-sale				Securities							Equity Method Investments			Investments, available-for-sale
	Owned													Owned
	Common Stocks			Limited Partnership Interests			GRP-TE			Preferred Securities				Common Stocks				Limited Partnership Interests			GRP-TE			Preferred Securities
Balance at beginning of period	$	1,343		$	994		$	43		$	3,753			$	1,275			$	—		$	—		$	4,150
Purchases / contributions	—			1,047			46			13				628				2,025			89			125
Sales / distributions	—			—			—			—				—				—			—			(1,213		)
Realized gain	—			—			—			—				—				—			—			100
Unrealized (loss) gain **	(150		)	—			—			(649		)		(82		)		16			—			8
Transfers out of level 3	—			—			—			(22		)	^	(628		)	*	—			—			(75		)	^
Balance at end of period	$	1,193		$	2,041		$	89		$	3,095			$	1,193			$	2,041		$	89		$	3,095
_________________________
*    Transferred from level 3 to level 2 because observable market data became available for the securities at September 30, 2012.
^	Transferred from level 3 to level 1 because securities started trading actively on an exchange during the nine months ended September 30, 2012.
**    Pertains to unrealized (loss) gain from securities held at September 30, 2012.
Realized gain (loss) from investments classified as securities owned, equity method investments and investments, available-for-sale in the above tables was recorded as gain (loss) from trading securities, equity in earnings (losses) of affiliates and gain (loss) from available-for-sale securities, respectively, in the Company's condensed consolidated statements of operations. Unrealized gain (loss) from investments classified as securities owned and equity method investments in the above tables was recorded as gain (loss) from trading securities and equity in earnings (losses) of affiliates, respectively, in the Company's condensed consolidated statements of operations. Unrealized gain (loss) from investments, available-for-sale in the above tables was recorded as net unrealized gain (loss) from available-for-sale securities in the Company's condensed consolidated statements of comprehensive income.
Valuation Techniques
In certain instances, debt and equity securities are valued on the basis of prices from an orderly transaction between market participants provided by reputable brokers/dealers or pricing services. In determining the value of a particular investment, 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 selectively performs detailed reviews of valuations provided by broker/dealers or pricing services.
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 interest 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 primarily 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 September 30, 2013 were:
	Fair Value			Fair Value		Significant	Input /
	(in thousands)			Methodology		Unobservable Inputs	Range
Common shares of privately-held company	$	424		Market comparable companies		Price / tangible book ratio	1.24x
						Liquidity discount	37.80%
Limited partnership interests - direct investments in real estate	$	1,985		Discounted cash flows		Discount rate	9% - 15%
						Exit capitalization rates	8% - 9%
						Market rental rates	$15.00 - 21.00 psf
The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of December 31, 2012 were:
	Fair Value			Fair Value		Significant
	(in thousands)			Methodology		Unobservable Inputs	Range
Common shares of privately-held company	$	1,168		Market comparable companies		Price / tangible book ratio	1.02x - 1.1x
Limited partnership interests	$	2,142		Transaction value		Recent transaction price
Changes in the significant unobservable inputs in the tables above may result in a materially higher or lower fair value measurement. The disclosure in the above tables excludes auction rate preferred securities for which fair value is based on unobservable but non-quantitative inputs. Such items include financial instruments for which the determination of fair value is based on unadjusted quotations provided by a third party pricing service. The disclosure in the above tables also excludes the Company's ownership interests in limited partnership vehicles which are valued based on the net asset values of the underlying funds.

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2013
Derivatives [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 September 30, 2013 (in thousands):
		30-Sep-13
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total foreign exchange contracts	$	13,348		$	109		$	6,433		$	187
	Total commodity contracts	8,121			230			6,671			263
	Total derivatives	$	21,469		$	339		$	13,104		$	450
	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, 2012 (in thousands):
		31-Dec-12
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total equity contracts	$	9,608		$	103		$	4,942		$	115
	Total foreign exchange contracts	13,584			616			—			—
	Total commodity contracts	17,817			336			10,954			492
	Total credit contracts	—			—			1,500			20
	Total derivatives	$	41,009		$	1,055		$	17,396		$	627
	As of September 30, 2013, cash included in due from broker and securities included in securities owned in the condensed consolidated statement of financial condition of approximately $956,000 and $8,499,000, respectively, were held as collateral for futures. As of December 31, 2012, cash included in due from broker and securities included in securities owned in the condensed consolidated statement of financial condition of approximately $2,161,000 and $849,000, respectively, were held as collateral for futures, total return and credit default swaps.
	Gain and loss from derivative financial instruments for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity contracts	$	—		$	14		$	(584	)	$	94
	Foreign exchange contracts	(105		)	(520		)	1,224			71
	Commodity contracts	1,087			1,585			(2,753		)	465
	Credit contracts	—			(15		)	(21		)	(22		)
	Total derivatives	$	982		$	1,064		$	(2,134	)	$	608
	Gain and loss from derivative financial instruments for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity contracts	$	—		$	14		$	(584	)	$	94
	Foreign exchange contracts	(105		)	(520		)	1,224			71
	Commodity contracts	1,087			1,585			(2,753		)	465
	Credit contracts	—			(15		)	(21		)	(22		)
	Total derivatives	$	982		$	1,064		$	(2,134	)	$	608

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic earnings per share are calculated by dividing net income attributable to common shareholders by the weighted average shares outstanding. Diluted earnings per share are calculated by dividing net income attributable to common shareholders 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 are computed using the treasury stock method.
	No anti-dilutive common stock equivalents were excluded from the computation for the three and nine months ended September 30, 2013 and 2012.
	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 nine months ended September 30, 2013 and 2012 (in thousands, except per share data):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Net income	$	19,817		$	12,567		$	43,827	$	45,852
	Less: Net (income) loss attributable to redeemable noncontrolling interest	(1,534		)	(2,306		)	4,879		(1,458		)
	Net income attributable to common shareholders	$	18,283		$	10,261		$	48,706	$	44,394
	Basic weighted average shares outstanding	44,317			43,822			44,254		43,744
	Dilutive potential shares from restricted stock units	789			715			743		695
	Diluted weighted average shares outstanding	45,106			44,537			44,997		44,439
	Basic earnings per share attributable to common shareholders	$	0.41		$	0.23		$	1.1	$	1.01
	Diluted earnings per share attributable to common shareholders	$	0.41		$	0.23		$	1.08	$	1

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure	'
	Income Taxes
	The provision for income taxes for the nine months ended September 30, 2013 includes U.S. federal, state, local and foreign taxes at an approximate effective tax rate of 37.5%, which included discrete items, the most significant of which was attributable to the launch costs of Cohen & Steers MLP Income and Energy Opportunity Fund, Inc., a closed-end mutual fund. Excluding the discrete items, the effective tax rate for the nine months ended September 30, 2013 was approximately 38%. The effective tax rate for the three months ended September 30, 2013 was approximately 38%. The effective tax rate for each of the three and nine months ended September 30, 2012 was approximately 33% and 35%, respectively, which included discrete items, the most significant of which was attributable to the launch costs of Cohen & Steers Limited Duration Preferred and Income Fund, Inc., a closed-end mutual fund. Excluding the discrete items, the effective tax rate for the three and nine months ended September 30, 2012 was approximately 36%. The Company expects the tax rate for the full year 2013 to approximate 38%, excluding discrete items.
	Deferred income taxes represent the tax effects of the temporary differences between book and tax bases 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	9 Months Ended
	Sep. 30, 2013
Regulatory Requirements [Abstract]	'
Regulatory Requirements	'
	Regulatory Requirements
	Securities, 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 defined. As of September 30, 2013, Securities had net capital of approximately $2,616,000, which exceeded its requirements by approximately $2,528,000. 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.
	Securities does not carry customer accounts and is exempt from the SEC’s Rule 15c3-3 pursuant to provisions (k)(1) of such rule.
	The non-U.S. subsidiaries of the Company (collectively, the “Foreign Regulated Entities”) are regulated outside the U.S. by the Hong Kong Securities and Futures Commission, the United Kingdom Financial Conduct Authority, and the Belgium Financial Services and Markets Authority. As of September 30, 2013, the Foreign Regulated Entities had aggregate regulatory capital of approximately $47,863,000, which exceeded requirements by approximately $44,797,000. In February 2013, the Company completed a reorganization of Cohen & Steers Europe S.P.R.L. which resulted in funds moving to the U.S.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	The Company is an investment adviser to, and has administrative 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 nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Investment advisory and administration fees	$	48,264	$	41,001	$	141,792	$	113,847
	Distribution and service fees	3,627		2,881		10,802		8,129
		$	51,891	$	43,882	$	152,594	$	121,976
	For the nine months ended September 30, 2012, the Company had investment advisory agreements with certain affiliated closed-end mutual funds, pursuant to which the Company contractually waived approximately $299,000 of advisory fees it was otherwise entitled to receive. There were no such fees waived for the three and nine months ended September 30, 2013 or for the three months ended September 30, 2012. These investment advisory agreements contractually required the Company to waive a portion of the advisory fees the Company otherwise would charge for up to 10 years from the respective fund's inception date. The board of directors of these mutual funds must approve the renewal of the advisory agreements each year, including any reduction in advisory fee waivers scheduled to take effect during that year. As of September 30, 2013, there were no additional scheduled reductions in advisory fee waivers for any fund.
	Sales proceeds, gross realized gain and dividend income from investments, available-for-sale in Company-sponsored mutual funds for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Proceeds from sales	$	102	$	—	$	10,715	$	103
	Gross realized gain	2		—		615		4
	Dividend income	—		—		—		2
	The Company has agreements with certain affiliated open-end and closed-end mutual funds to reimburse certain fund expenses. For the three months ended September 30, 2013 and 2012, expenses of approximately $2,629,000 and $1,214,000, respectively, were incurred by the Company pursuant to these agreements and are included in general and administrative expenses. For the nine months ended September 30, 2013 and 2012, expenses of approximately $7,353,000 and $4,735,000, respectively, were incurred.
	Included in accounts receivable at September 30, 2013 and December 31, 2012 are receivables due from affiliated funds of approximately $17,814,000 and $18,133,000, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	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 business or financial condition.
	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 September 30, 2013, the Company has funded approximately $2.5 million with respect to this commitment. The actual timing of the funding of this commitment is currently unknown, as the drawdown of the Company's commitment is contingent on the timing of drawdowns by the underlying funds and co-investments in which GRP-TE invests. This unfunded commitment was not recorded on the Company's condensed consolidated statement of financial condition as of September 30, 2013.

Concentration_of_Credit_Risk

Concentration of Credit Risk	9 Months Ended
	Sep. 30, 2013
Concentration of Credit Risk [Abstract]	'
Concentration of Credit Risk	'
	Concentration of Credit Risk
	The Company's cash is 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	9 Months Ended
	Sep. 30, 2013
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 necessitated disclosures and/or adjustments.
	On November 6, 2013, CNS declared quarterly and special cash dividends on its common stock in the amount of $0.20 and $1.00 per share, respectively. These dividends will be payable on December 20, 2013 to stockholders of record at the close of business on December 2, 2013.

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Basis of Presentation and Significant Accounting Policies [Abstract]	'
Accounting Estimates	'
	Accounting Estimates—The preparation of the condensed consolidated financial statements requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and 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.
Reclassifications	'
	Reclassifications—Certain prior year amounts have been reclassified to conform to the current year presentation.
Consolidation	'
	Consolidation—The Company consolidates operating entities deemed to be voting interest entities if the Company owns a majority of the voting interest. The equity method of accounting is used for investments in non-controlled affiliates in which the Company’s ownership ranges from 20 to 50 percent, or in instances in which the Company is able to exercise significant influence but not control. The Company also consolidates any variable interest entities (“VIEs”) in which the Company is the primary beneficiary. The Company provides for noncontrolling interests in consolidated subsidiaries for which the Company’s ownership is less than 100 percent.
VIE	'
	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 the obligation to absorb a majority of the expected losses or the right to receive the majority of the residual returns. 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 entities in which it has an interest are VIEs upon initial involvement and at each reporting date. 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.
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 Broker	'
	Due from Broker—The Company conducts business, primarily through 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 agreements with prime brokers. The due from broker balance represents cash and cash equivalents balances at brokers and net receivables and payables for unsettled security 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.
	Securities owned and securities sold but not yet purchased are classified as trading securities 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 the Company’s valuation committee. Unrealized gain and loss are recorded as gain (loss) from trading securities—net reported in the Company’s condensed consolidated statements of operations.
	Investments classified as equity method investments are accounted for using the equity method, under which the Company recognizes its respective share of the investee’s net income or loss for the period. As of September 30, 2013, the Company's equity method investments consisted of interests in funds which measure their underlying investments at fair value 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, investment-grade preferred instruments and investments in Company-sponsored open-end and closed-end mutual funds. 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 gain and loss, 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, the loss will be recognized in the Company’s condensed consolidated statements of operations. An other than temporary impairment is generally presumed to have occurred if the available-for-sale investment has an unrealized loss continuously for 12 or more months.
	From time to time, the 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 with gain and loss recorded as gain (loss) from trading securities—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 in the Company's condensed consolidated statements of financial condition.
	Additionally, from time to time, the Company enters into foreign exchange contracts to hedge its currency exposure related to client receivables. These instruments are measured at fair value with gain and loss recorded in other non-operating income 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 in 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 Administrative 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 mutual funds. This revenue is earned pursuant to the terms of the underlying advisory contract, and is based on a contractual investment advisory fee applied to the assets in the client’s portfolio, net of applicable waivers. The Company also earns revenue from administration fees paid by certain Company-sponsored open-end and closed-end mutual funds, based on the average assets under management of such funds. This revenue is recognized as such fees are earned.
Distribution and Service Fees	'
	Distribution and Service Fees—Distribution and service fee revenue is earned as the services are performed, based on contractually-predetermined percentages of the average assets under management of the Company-sponsored open-end load mutual funds. Distribution and service fee revenue is recorded gross of any third-party distribution and service fee expense arrangements. The expenses associated with these third-party distribution and service fee arrangements are recorded as incurred.
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 strategies accounts; ii) earning a licensing fee for the use of the Company's proprietary indices; 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 granted to employees. This expense is recognized over the period during which employees are required to provide service. The Company also estimates forfeitures.
Income Taxes	'
	Income Taxes—The Company records the current and deferred tax consequences of all transactions that have been recognized in the 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. Deferred tax liabilities are recognized for temporary differences that will result in taxable income in future 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.
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 are translated at average exchange rates during the period. The gain or loss resulting from translating non-U.S. dollar functional currency into U.S. dollars is included in the Company's condensed consolidated statements of comprehensive income. Gain or loss resulting from non-U.S. dollar currency transactions is included in other non-operating income in the condensed consolidated statements of operations.
Comprehensive Income	'
	Comprehensive Income—The Company reports all changes in comprehensive income in the condensed consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common shareholders, unrealized gain and loss from available-for-sale securities (net of tax), foreign currency translation gain and loss (net of tax) and reclassification to statements of operations of gain and loss from available-for-sale securities (net of tax).
Recently Issued Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements—In July 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance on the presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryfoward exists. An entity is required to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward unless a net operating loss carryforward, a similar tax loss or a tax credit carryforward is not available as of the reporting date or the entity does not intend to use the deferred tax asset for this purpose (provided that the tax law permits a choice). This new guidance will be effective for the Company's first quarter of 2014. The Company does not anticipate that the adoption of this new guidance will have a material impact on the Company's condensed consolidated financial statements.
	In February 2013, the FASB issued new guidance requiring an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. An entity is also required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In January 2013, the FASB issued new guidance to clarify the scope of the offsetting disclosures associated with derivative and hedging transactions, including bifurcated embedded derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In October 2012, the FASB issued new guidance to make certain technical corrections to the FASB Accounting Standards Codification ("Codification"), which identifies when the use of fair value should be linked to the definition of fair value in Codification Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). The amendments affect various Codification topics and include source literature amendments, guidance clarification and reference corrections and relocated guidance. The amendments that will not have transition guidance were effective upon issuance and the amendments that are subject to the transition guidance were effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In July 2012, the FASB issued new guidance to simplify how entities test indefinite-lived intangible assets for impairment. The new guidance permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount as a basis for determining whether it is necessary to perform the second step to measure the amount of the impairment loss, if any. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
	In December 2011, the FASB issued new guidance to create new disclosure requirements about the nature of an entity's rights of offset and related arrangements associated with its financial instruments and derivative instruments. This new guidance was effective for the Company's first quarter of 2013. The adoption of this new guidance did not have a material impact on the Company's condensed consolidated financial statements.
Fair Value of Financial Instruments	'
	Valuation Techniques
	In certain instances, debt and equity securities are valued on the basis of prices from an orderly transaction between market participants provided by reputable brokers/dealers or pricing services. In determining the value of a particular investment, 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 selectively performs detailed reviews of valuations provided by broker/dealers or pricing services.
	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 interest 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 primarily 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.

Fair_Value_Valuation_Technique

Fair Value Valuation Technique (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Fair Value of Financial Instruments	'
	Valuation Techniques
	In certain instances, debt and equity securities are valued on the basis of prices from an orderly transaction between market participants provided by reputable brokers/dealers or pricing services. In determining the value of a particular investment, 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 selectively performs detailed reviews of valuations provided by broker/dealers or pricing services.
	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 interest 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 primarily 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_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill and Intangible Assets [Abstract]	'
Schedule of Intangible Assets	'
	The following table details the gross carrying amounts and accumulated amortization for the intangible assets at September 30, 2013 and December 31, 2012 (in thousands):
		Remaining		Gross		Accumulated			Intangible
		Amortization		Carrying		Amortization			Assets, Net
		Period		Amount
		(in months)
	September 30, 2013:
	Amortized intangible assets:
	Client relationships	63		$	1,543	$	(1,069	)	$	474
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250		—			1,250
	Total			$	2,793	$	(1,069	)	$	1,724
	December 31, 2012:
	Amortized intangible assets:
	Client relationships	72		$	1,543	$	(1,003	)	$	540
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250		—			1,250
	Total			$	2,793	$	(1,003	)	$	1,790
Schedule Future Amortization Expense	'
	Estimated future amortization expense is as follows (in thousands):
	Periods Ending December 31,	Estimated
		Amortization
		Expense
	2013	$	23
	2014	89
	2015	89
	2016	89
	2017	89
	Thereafter	95
	Total	$	474

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Summary Investment Holdings	'
	The following is a summary of the Company's investments as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30,			December 31, 2012
		2013
	Securities owned	$	11,507		$	97,155
	Equity method investments	24,301			8,106
	Investments, available-for-sale	13,539			25,322
Schedule of Variable Interest Entities	'
	The following represents the portion of the condensed consolidated statements of financial condition attributable to the consolidated Onshore Fund as of December 31, 2012. As of December 31, 2012, the following assets were available only to settle obligations of the Onshore Fund and these liabilities were only the obligations of the Onshore Fund for which the creditors did not have recourse to the general credit of the Company (in thousands):
		31-Dec-12
	Assets:
	Securities owned	$	26,002
	Due from broker	12,358
	Other assets	103
	Total assets	$	38,463
	Liabilities:
	Securities sold but not yet purchased	$	14,685
	Other liabilities	335
	Total liabilities	$	15,020
Schedule of Fair Value of Securities Owned and Equity Investments	'
	The following is a summary of the fair value of securities owned and equity method investments as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013						December 31, 2012
		Securities Owned			Equity Method Investments			Securities Owned			Equity Method Investments
	ACOM	$	8,500		$	—		$	—		$	—
	GRP-CIP	2,583			—			2,142			—
	GRP-TE	—			105			—			89
	Offshore Fund	—			376			—			8,017
	Onshore Fund	424			—			26,002			—
	RAP	—			23,820			69,011			—
	Total	$	11,507		$	24,301		$	97,155		$	8,106
Trading Securities	'
	Gain (loss) from trading securities—net for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	ACOM	$	123		$	—		$	(503	)	$	—
	GLIF	—			—			—			142
	GRP-CIP	287			—			264			9
	Onshore Fund	(104		)	67			417			1,921
	RAP	2,077			3,932			(7,134		)	1,179
	Total gain (loss) from trading securities—net	$	2,383		$	3,999		$	(6,956	)	$	3,251
Schedule of Equity in Earnings (Losses) of Affiliates	'
	Equity in earnings (losses) of affiliates for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	GRP-TE	$	7		$	—		$	7		$	—
	Offshore Fund	5			71			114			714
	RAP	301			—			301			—
	Total equity in earnings of affiliates	$	313		$	71		$	422		$	714
Schedule of Available-for-sale Securities Reconciliation	'
	The following is a summary of the cost, gross unrealized gain, gross unrealized loss and fair value of investments, available-for-sale as of September 30, 2013 and December 31, 2012 (in thousands):
		September 30, 2013
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
					Gain			Loss <
								12 months
	Preferred securities	$	4,135		$	211		$	(41	)	$	4,305
	Common stocks	7,977			1,241			(176		)	9,042
	Company-sponsored mutual funds	199			—			(7		)	192
	Total investments, available-for-sale	$	12,311		$	1,452		$	(224	)	$	13,539
		December 31, 2012
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
					Gain			Loss <
								12 months
	Preferred securities	$	4,351		$	70		$	(82	)	$	4,339
	Common stocks	9,490			1,147			(249		)	10,388
	Company-sponsored mutual funds	10,100			495			—			10,595
	Total investments, available-for-sale	$	23,941		$	1,712		$	(331	)	$	25,322
Realized Gain (Loss) on Investments	'
	Sales proceeds, gross realized gain and gross realized loss from investments, available-for-sale for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Proceeds from sales	$	3,570		$	7,005		$	21,326		$	24,166
	Gross realized gain	283			562			1,846			1,704
	Gross realized loss	(103		)	(125		)	(338		)	(664		)

Fair_Value_Tables

Fair Value (Tables)	9 Months Ended
	Sep. 30, 2013										Sep. 30, 2012
Fair Value [Abstract]	'										'
Fair Value Measurements, Recurring and Nonrecurring	'										'
	Transfers among levels, if any, are recorded at the beginning of the reporting period.
	The following table presents fair value measurements as of September 30, 2013 (in thousands):
		Level 1		Level 2			Level 3		Total
	Cash equivalents*	$	59,422	$	—		$	—	$	59,422
	Securities owned
	Common stocks	$	—	$	—		$	424	$	424
	Fixed income securities	—		8,500			—		8,500
	Limited partnership interests	—		—			2,583		2,583
	Total securities owned	$	—	$	8,500		$	3,007	$	11,507
	Equity method investments	$	23,820	$	—		$	481	$	24,301
	Investments, available-for-sale
	Preferred securities	$	951	$	—		$	3,354	$	4,305
	Common stocks	9,042		—			—		9,042
	Company-sponsored mutual funds	192		—			—		192
	Total investments, available-for-sale	$	10,185	$	—		$	3,354	$	13,539
	Derivatives - assets
	Foreign exchange contracts	$	—	$	109		$	—	$	109
	Commodity contracts	230		—			—		230
	Total derivatives - assets	$	230	$	109		$	—	$	339
	Derivatives - liabilities
	Foreign exchange contracts	$	—	$	187		$	—	$	187
	Commodity contracts	263		—			—		263
	Total derivatives - liabilities	$	263	$	187		$	—	$	450
	_________________________
	*    Comprised of investments in money market funds.
	The following table presents fair value measurements as of December 31, 2012 (in thousands):
		Level 1		Level 2			Level 3		Total
	Cash equivalents*	$	20,204	$	—		$	—	$	20,204
	Due from broker*	$	3,950	$	—		$	—	$	3,950
	Securities owned
	Preferred securities	$	1,418	$	1,505		$	—	$	2,923
	Common stocks	51,354		16,744			1,168		69,266
	Fixed income securities	—		22,824			—		22,824
	Limited partnership interests	—		—			2,142		2,142
	Total securities owned	$	52,772	$	41,073		$	3,310	$	97,155
	Equity method investments	$	—	$	8,017		$	89	$	8,106
	Investments, available-for-sale
	Preferred securities	$	1,254	$	5		$	3,080	$	4,339
	Common stocks	10,388		—			—		10,388
	Company-sponsored mutual funds	10,595		—			—		10,595
	Total investments, available-for-sale	$	22,237	$	5		$	3,080	$	25,322
	Derivatives - assets
	Equity contracts	$	51	$	52		$	—	$	103
	Foreign exchange contracts	—		616			—		616
	Commodity contracts	336		—			—		336
	Total derivatives - assets	$	387	$	668		$	—	$	1,055
	Derivatives - liabilities
	Equity contracts	$	4	$	111		$	—	$	115
	Commodity contracts	492		—			—		492
	Credit contracts	—		20			—		20
	Total derivatives - liabilities	$	496	$	131		$	—	$	627
	Securities sold but not yet purchased - common stocks	$	14,685	$	—		$	—	$	14,685
	_________________________
	*    Comprised of investments in money market funds.
Fair Value, Valuation Technique, Unobservable Inputs	'										'
	The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of September 30, 2013 were:										The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and nine months ended September 30, 2013 (in thousands):
		Fair Value		Fair Value		Significant	Input /					Three Months Ended													Nine Months Ended
		(in thousands)		Methodology		Unobservable Inputs	Range					30-Sep-13													30-Sep-13
	Common shares of privately-held company	$	424	Market comparable companies		Price / tangible book ratio	1.24x					Securities						Equity Method Investments			Investments, available-for-sale				Securities							Equity Method Investments			Investments, available-for-sale
						Liquidity discount	37.80%					Owned													Owned
	Limited partnership interests - direct investments in real estate	$	1,985	Discounted cash flows		Discount rate	9% - 15%					Common Stocks			Limited Partnership Interests			GRP-TE/Offshore Fund			Preferred Securities				Common Stocks				Limited Partnership Interests			GRP-TE/Offshore Fund			Preferred Securities
						Exit capitalization rates	8% - 9%				Balance at beginning of period	$	413		$	2,210		$	96		$	3,092			$	1,168			$	2,142		$	89		$	3,080
						Market rental rates	$15.00 - 21.00 psf
											Purchases / contributions	—			115			3			—				—				318			10			—
											Sales / distributions	—			(28		)	(7,066		)	—				(419		)		(141		)	(7,066		)	—
											Realized gain (loss)	—			11			—			—				(211		)		11			—			—
											Unrealized gain (loss) *	11			275			12			262				(114		)		253			12			274
											Transfers into level 3	—			—			7,436			—				—				—			7,436			—
											Balance at end of period	$	424		$	2,583		$	481		$	3,354			$	424			$	2,583		$	481		$	3,354
											_________________________
											*    Pertains to unrealized gain (loss) from securities held at September 30, 2013.
											The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the three and nine months ended September 30, 2012 (in thousands):
												Three Months Ended													Nine Months Ended
												30-Sep-12													30-Sep-12
												Securities						Equity Method Investments			Investments, available-for-sale				Securities							Equity Method Investments			Investments, available-for-sale
												Owned													Owned
												Common Stocks			Limited Partnership Interests			GRP-TE			Preferred Securities				Common Stocks				Limited Partnership Interests			GRP-TE			Preferred Securities
											Balance at beginning of period	$	1,343		$	994		$	43		$	3,753			$	1,275			$	—		$	—		$	4,150
											Purchases / contributions	—			1,047			46			13				628				2,025			89			125
											Sales / distributions	—			—			—			—				—				—			—			(1,213		)
											Realized gain	—			—			—			—				—				—			—			100
											Unrealized (loss) gain **	(150		)	—			—			(649		)		(82		)		16			—			8
											Transfers out of level 3	—			—			—			(22		)	^	(628		)	*	—			—			(75		)	^
											Balance at end of period	$	1,193		$	2,041		$	89		$	3,095			$	1,193			$	2,041		$	89		$	3,095

Derivatives_Tables

Derivatives (Tables)	9 Months Ended
	Sep. 30, 2013
Derivatives [Abstract]	'
Schedule of Notional Amounts of Outstanding Derivative Positions	'
	The notional amount represents the absolute value amount of all outstanding derivative contracts at December 31, 2012 (in thousands):
		31-Dec-12
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total equity contracts	$	9,608		$	103		$	4,942		$	115
	Total foreign exchange contracts	13,584			616			—			—
	Total commodity contracts	17,817			336			10,954			492
	Total credit contracts	—			—			1,500			20
	Total derivatives	$	41,009		$	1,055		$	17,396		$	627
	The notional amount represents the absolute value amount of all outstanding derivative contracts at September 30, 2013 (in thousands):
		30-Sep-13
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total foreign exchange contracts	$	13,348		$	109		$	6,433		$	187
	Total commodity contracts	8,121			230			6,671			263
	Total derivatives	$	21,469		$	339		$	13,104		$	450
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 September 30, 2013 (in thousands):
		30-Sep-13
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total foreign exchange contracts	$	13,348		$	109		$	6,433		$	187
	Total commodity contracts	8,121			230			6,671			263
	Total derivatives	$	21,469		$	339		$	13,104		$	450
	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, 2012 (in thousands):
		31-Dec-12
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total equity contracts	$	9,608		$	103		$	4,942		$	115
	Total foreign exchange contracts	13,584			616			—			—
	Total commodity contracts	17,817			336			10,954			492
	Total credit contracts	—			—			1,500			20
	Total derivatives	$	41,009		$	1,055		$	17,396		$	627
	As of September 30, 2013, cash included in due from broker and securities included in securities owned in the condensed consolidated statement of financial condition of approximately $956,000 and $8,499,000, respectively, were held as collateral for futures. As of December 31, 2012, cash included in due from broker and securities included in securities owned in the condensed consolidated statement of financial condition of approximately $2,161,000 and $849,000, respectively, were held as collateral for futures, total return and credit default swaps.
	Gain and loss from derivative financial instruments for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity contracts	$	—		$	14		$	(584	)	$	94
	Foreign exchange contracts	(105		)	(520		)	1,224			71
	Commodity contracts	1,087			1,585			(2,753		)	465
	Credit contracts	—			(15		)	(21		)	(22		)
	Total derivatives	$	982		$	1,064		$	(2,134	)	$	608
	Gain and loss from derivative financial instruments for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013			2012
	Equity contracts	$	—		$	14		$	(584	)	$	94
	Foreign exchange contracts	(105		)	(520		)	1,224			71
	Commodity contracts	1,087			1,585			(2,753		)	465
	Credit contracts	—			(15		)	(21		)	(22		)
	Total derivatives	$	982		$	1,064		$	(2,134	)	$	608

Earnings_Per_Share_Earnings_Pe

Earnings Per Share Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
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 nine months ended September 30, 2013 and 2012 (in thousands, except per share data):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2013			2012			2013		2012
	Net income	$	19,817		$	12,567		$	43,827	$	45,852
	Less: Net (income) loss attributable to redeemable noncontrolling interest	(1,534		)	(2,306		)	4,879		(1,458		)
	Net income attributable to common shareholders	$	18,283		$	10,261		$	48,706	$	44,394
	Basic weighted average shares outstanding	44,317			43,822			44,254		43,744
	Dilutive potential shares from restricted stock units	789			715			743		695
	Diluted weighted average shares outstanding	45,106			44,537			44,997		44,439
	Basic earnings per share attributable to common shareholders	$	0.41		$	0.23		$	1.1	$	1.01
	Diluted earnings per share attributable to common shareholders	$	0.41		$	0.23		$	1.08	$	1

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2013
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 nine months ended September 30, 2013 and 2012 (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Investment advisory and administration fees	$	48,264	$	41,001	$	141,792	$	113,847
	Distribution and service fees	3,627		2,881		10,802		8,129
		$	51,891	$	43,882	$	152,594	$	121,976
Schedule of Realized Gain (Loss)	'
	Sales proceeds, gross realized gain and dividend income from investments, available-for-sale in Company-sponsored mutual funds for the three and nine months ended September 30, 2013 and 2012 are summarized below (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2013		2012		2013		2012
	Proceeds from sales	$	102	$	—	$	10,715	$	103
	Gross realized gain	2		—		615		4
	Dividend income	—		—		—		2

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies (Details)	Sep. 30, 2012
Minimum	'
Schedule of Equity Method Investments [Line Items]	'
Ownership range	20.00%
Maximum	'
Schedule of Equity Method Investments [Line Items]	'
Ownership range	50.00%

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies Schedule of Distribution and Service Fees - Non-GAAP (Details) (USD $)	9 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012
	mutual_funds	Distribution rights	Distribution rights
Distribution and service fees - Non-GAAP	'	'	'
Distribution and service fees - Non GAAP	'	$7.20	$14.40
Closed-end mutual funds	2	'	'

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Goodwill	'	$20,448	'	$20,122
Goodwill, Translation Adjustments	'	326	'	'
Finite-Lived Intangible Assets, Accumulated Amortization	'	-1,069	'	-1,003
Intangible Assets, Net	'	474	'	'
Intangible Assets Gross Excluding Goodwill	'	2,793	'	2,793
Intangible assets—net	'	1,724	'	1,790
Amortization of Intangible Assets	22	'	66	'
Remaining Amortization Period	'	'63 months	'	'72 months
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'	'	'	'
2013	'	23	'	'
2014	'	89	'	'
2015	'	89	'	'
2016	'	89	'	'
2017	'	89	'	'
Thereafter	'	95	'	'
Total	'	474	'	'
Customer Relationships	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Finite-Lived Intangible Assets, Gross	'	1,543	'	1,543
Finite-Lived Intangible Assets, Accumulated Amortization	'	-1,069	'	-1,003
Intangible Assets, Net	'	474	'	540
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'	'	'	'
Total	'	474	'	540
Mutual Fund Management Contracts	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'
Indefinite-lived Intangible Assets	'	$1,250	'	$1,250

Investments_Trading_and_equity

Investments Trading and equity investments (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Assets:	'		'	'		'	'
Securities owned	$11,507,000	[1],[2]	'	$11,507,000	[1],[2]	'	$97,155,000	[1],[2]
Due from broker	1,838,000	[2]	'	1,838,000	[2]	'	17,617,000	[2]
Other assets	6,517,000	[2]	'	6,517,000	[2]	'	8,120,000	[2]
Total assets	297,111,000		'	297,111,000		'	337,315,000
Liabilities:	'		'	'		'	'
Other liabilities	17,564,000	[2]	'	17,564,000	[2]	'	18,181,000	[2]
Total liabilities	45,911,000		'	45,911,000		'	67,547,000
Equity Method Investments	24,301,000		'	24,301,000		'	8,106,000
Total gain (loss) from trading securities—net	2,383,000		3,999,000	-6,956,000		3,251,000	'
Total equity in earnings of affiliates	313,000		71,000	422,000		714,000	'
Equity method investments	24,301,000		'	24,301,000		'	8,106,000
Investments, available-for-sale	13,539,000		'	13,539,000		'	25,322,000
ACOM	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	8,500,000		'	8,500,000		'	0
Liabilities:	'		'	'		'	'
Equity Method Investments	0		'	0		'	0
Total gain (loss) from trading securities—net	123,000		0	-503,000		0	'
GLIF	'		'	'		'	'
Liabilities:	'		'	'		'	'
Total gain (loss) from trading securities—net	0		0	0		142,000	'
GRP-CIP	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	2,583,000		'	2,583,000		'	2,142,000
Liabilities:	'		'	'		'	'
Equity Method Investments	0		'	0		'	0
Total gain (loss) from trading securities—net	287,000		0	264,000		9,000	'
GRP-TE	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	0		'	0		'	0
Liabilities:	'		'	'		'	'
Equity Method Investments	105,000		'	105,000		'	89,000
Total equity in earnings of affiliates	7,000		0	7,000		0	'
Offshore Fund	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	0		'	0		'	0
Liabilities:	'		'	'		'	'
Equity Method Investments	376,000		'	376,000		'	8,017,000
Total equity in earnings of affiliates	5,000		71,000	114,000		714,000	'
Onshore Fund	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	424,000		'	424,000		'	26,002,000
Liabilities:	'		'	'		'	'
Equity Method Investments	0		'	0		'	0
Total gain (loss) from trading securities—net	-104,000		67,000	417,000		1,921,000	'
RAP	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	0		'	0		'	69,011,000
Liabilities:	'		'	'		'	'
Equity Method Investments	23,820,000		'	23,820,000		'	0
Total gain (loss) from trading securities—net	2,077,000		3,932,000	-7,134,000		1,179,000	'
Total equity in earnings of affiliates	301,000		0	301,000		0	'
Onshore Fund	'		'	'		'	'
Assets:	'		'	'		'	'
Securities owned	'		'	'		'	26,002,000
Due from broker	'		'	'		'	12,358,000
Other assets	'		'	'		'	103,000
Total assets	'		'	'		'	38,463,000
Liabilities:	'		'	'		'	'
Securities sold but not yet purchased	'		'	'		'	14,685,000
Other liabilities	'		'	'		'	335,000
Total liabilities	'		'	'		'	$15,020,000
[1]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of September 30, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.
[2]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to the Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.

Investments_Available_for_Sale

Investments Available for Sale Securities (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Available-for-sale Securities [Abstract]	'	'	'	'	'
Cost	$12,311	'	$12,311	'	$23,941
Gross Unrealized Gain	'	'	1,452	'	1,712
Gross Unrealized Loss less than 12 months	'	'	-224	'	-331
Fair Value	13,539	'	13,539	'	25,322
Proceeds from Investing Activities [Abstract]	'	'	'	'	'
Proceeds from sales	3,570	7,005	21,326	24,166	'
Gross realized gain	283	562	1,846	1,704	'
Gross realized loss	-103	-125	-338	-664	'
Preferred securities	'	'	'	'	'
Available-for-sale Securities [Abstract]	'	'	'	'	'
Cost	4,135	'	4,135	'	4,351
Gross Unrealized Gain	'	'	211	'	70
Gross Unrealized Loss less than 12 months	'	'	-41	'	-82
Fair Value	4,305	'	4,305	'	4,339
Common stocks	'	'	'	'	'
Available-for-sale Securities [Abstract]	'	'	'	'	'
Cost	7,977	'	7,977	'	9,490
Gross Unrealized Gain	'	'	1,241	'	1,147
Gross Unrealized Loss less than 12 months	'	'	-176	'	-249
Fair Value	9,042	'	9,042	'	10,388
Company-sponsored mutual funds	'	'	'	'	'
Available-for-sale Securities [Abstract]	'	'	'	'	'
Cost	199	'	199	'	10,100
Gross Unrealized Gain	'	'	0	'	495
Gross Unrealized Loss less than 12 months	'	'	-7	'	0
Fair Value	$192	'	$192	'	$10,595

Fair_Value_Details

Fair Value (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Level 3

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Preferred securities

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Common Stocks

Fixed income securities

Fixed income securities

Fixed income securities

Fixed income securities

Fixed income securities

Fixed income securities

Fixed income securities

Fixed income securities

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

Limited partnership interests

GRP-TE

GRP-TE

GRP-TE

GRP-TE

GRP-TE

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

Company-sponsored mutual funds

GRP-TE/Offshore Fund

GRP-TE/Offshore Fund

Equity Contracts

Equity Contracts

Equity Contracts

Equity Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Foreign Exchange Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Commodity Contracts

Credit Contracts

Credit Contracts

Credit Contracts

Credit Contracts

Minimum

Minimum

Maximum

Maximum

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Level 3

Level 3

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Level 3

Level 3

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Level 3

Level 3

Level 3

Level 3

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Level 3

Total

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Level 3

Total

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Level 3

Level 3

Level 3

Total

Total

Level 3

Level 3

Level 3

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Level 3

Level 3

Level 1

Level 2

Level 3

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Level 1

Level 1

Level 2

Level 2

Level 3

Level 3

Total

Total

Level 1

Level 2

Level 3

Total

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Assets, Level 2 to Level 1 Transfers, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$16,744,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash equivalents

'

'

'

59,422,000

[1]

20,204,000

[1]

0

[1]

0

[1]

0

[1]

0

[1]

59,422,000

[1]

20,204,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Due from broker

'

'

'

'

3,950,000

[1]

'

0

[1]

'

0

[1]

'

3,950,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities owned

11,507,000

[2],[3]

97,155,000

[2],[3]

'

0

52,772,000

8,500,000

41,073,000

3,007,000

3,310,000

11,507,000

97,155,000

'

'

'

1,418,000

'

1,505,000

'

'

'

'

0

'

2,923,000

'

'

'

'

'

0

51,354,000

0

16,744,000

424,000

'

424,000

'

1,168,000

424,000

69,266,000

0

0

8,500,000

22,824,000

0

0

8,500,000

22,824,000

'

'

0

0

0

0

2,583,000

'

2,583,000

'

2,142,000

2,583,000

2,142,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investments

24,301,000

8,106,000

'

23,820,000

0

0

8,017,000

481,000

89,000

24,301,000

8,106,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

105,000

89,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investments, available-for-sale

13,539,000

25,322,000

'

10,185,000

22,237,000

0

5,000

3,354,000

3,080,000

13,539,000

25,322,000

4,305,000

4,339,000

951,000

1,254,000

0

5,000

3,354,000

'

3,354,000

'

3,080,000

4,305,000

4,339,000

9,042,000

10,388,000

'

'

'

9,042,000

10,388,000

0

0

0

'

0

'

0

9,042,000

10,388,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

192,000

10,595,000

192,000

10,595,000

0

0

0

0

192,000

10,595,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative - assets

'

'

'

230,000

387,000

109,000

668,000

0

0

339,000

1,055,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

51,000

52,000

0

103,000

0

0

109,000

616,000

0

0

109,000

616,000

230,000

336,000

0

0

0

0

230,000

336,000

'

'

'

'

'

'

'

'

Derivative - liabilities

'

'

'

263,000

496,000

187,000

131,000

0

0

450,000

627,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,000

111,000

0

115,000

0

'

187,000

'

0

'

187,000

'

263,000

492,000

0

0

0

0

263,000

492,000

0

20,000

0

20,000

'

'

'

'

Securities sold not yet purchased

'

'

'

'

14,685,000

'

0

'

0

'

14,685,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning Balance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,092,000

3,753,000

3,080,000

4,150,000

'

'

'

'

'

'

'

'

'

'

'

'

413,000

1,343,000

1,168,000

1,275,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,210,000

994,000

2,142,000

0

'

'

'

'

'

'

43,000

0

'

'

'

'

'

'

'

'

'

'

96,000

89,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchases / contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

13,000

0

125,000

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

628,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

115,000

1,047,000

318,000

2,025,000

'

'

'

'

'

'

46,000

89,000

'

'

'

'

'

'

'

'

'

'

3,000

10,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales / distributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

-1,213,000

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-419,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-28,000

0

-141,000

0

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

-7,066,000

-7,066,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Realized gain (loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

100,000

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-211,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11,000

0

11,000

0

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized gain (loss)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

262,000

[4]

-649,000

[5]

274,000

[4]

8,000

[5]

'

'

'

'

'

'

'

'

'

'

'

'

11,000

[4]

-150,000

[5]

-114,000

[4]

-82,000

[5]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

275,000

[4]

0

[5]

253,000

[4]

16,000

[5]

'

'

'

'

'

'

0

[5]

0

[5]

'

'

'

'

'

'

'

'

'

'

12,000

[4]

12,000

[4]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfers Into Level 3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

-22,000

[6]

0

-75,000

[6]

'

'

'

'

'

'

'

'

'

'

'

'

0

0

[7]

0

-628,000

[7]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

0

'

'

'

'

'

7,436,000

0

0

'

'

'

'

'

'

'

'

'

'

7,436,000

7,436,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ending Balance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,354,000

3,095,000

3,354,000

3,095,000

'

'

'

'

'

'

'

'

'

'

'

'

424,000

1,193,000

424,000

1,193,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,583,000

2,041,000

2,583,000

2,041,000

'

'

'

'

'

'

89,000

89,000

'

'

'

'

'

'

'

'

'

'

481,000

481,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Level 3 Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$424,000

$1,168,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,985,000

$2,142,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Level 3 Ratio Ranges

'

'

1.24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.02

'

1.1

Fair Value Inputs, Liquidity Discount

'

'

37.80%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Inputs, Discount Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

'

0.00%

'

fair value inputs, exit capitalization

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

'

0.00%

'

Fair Value Inputs, Price Per Square Foot

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15

'

0

'

[1]

Comprised of investments in money market funds.

[2]

Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of September 30, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.

[3]

Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to the Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.

[4]

Pertains to unrealized gain (loss) from securities held at September 30, 2013.

[5]

Pertains to unrealized (loss) gain from securities held at September 30, 2012.

[6]

Transferred from level 3 to level 1 because securities started trading actively on an exchange during the nine months ended September 30, 2012.

[7]

Transferred from level 3 to level 2 because observable market data became available for the securities at September 30, 2012.

Derivatives_Details

Derivatives (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Derivative [Line Items]	'	'	'	'	'
Derivative Assets, Notional Amount	$21,469	'	$21,469	'	$41,009
Derivative Assets, Fair Value	339	'	339	'	1,055
Derivative Liabilities, Notional Amount	13,104	'	13,104	'	17,396
Derivative Liabilities, Fair Value	450	'	450	'	627
Derivative, Gain (Loss) on Derivative, Net	982	1,064	-2,134	608	'
Due From Broker	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Cash included in due from broker pledged as collateral	956	'	956	'	2,161
Securitites Owned	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Securities owned and held as collateral	8,499	'	8,499	'	849
Equity Contracts	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Derivative Assets, Notional Amount	'	'	'	'	9,608
Derivative Assets, Fair Value	'	'	'	'	103
Derivative Liabilities, Notional Amount	'	'	'	'	4,942
Derivative Liabilities, Fair Value	'	'	'	'	115
Derivative, Gain (Loss) on Derivative, Net	0	14	-584	94	'
Foreign Exchange Contracts	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Derivative Assets, Notional Amount	13,348	'	13,348	'	13,584
Derivative Assets, Fair Value	109	'	109	'	616
Derivative Liabilities, Notional Amount	6,433	'	6,433	'	0
Derivative Liabilities, Fair Value	187	'	187	'	0
Derivative, Gain (Loss) on Derivative, Net	-105	-520	1,224	71	'
Commodity Contracts	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Derivative Assets, Notional Amount	8,121	'	8,121	'	17,817
Derivative Assets, Fair Value	230	'	230	'	336
Derivative Liabilities, Notional Amount	6,671	'	6,671	'	10,954
Derivative Liabilities, Fair Value	263	'	263	'	492
Derivative, Gain (Loss) on Derivative, Net	1,087	1,585	-2,753	465	'
Credit Contracts	'	'	'	'	'
Derivative [Line Items]	'	'	'	'	'
Derivative Assets, Notional Amount	'	'	'	'	0
Derivative Assets, Fair Value	'	'	'	'	0
Derivative Liabilities, Notional Amount	'	'	'	'	1,500
Derivative Liabilities, Fair Value	'	'	'	'	20
Derivative, Gain (Loss) on Derivative, Net	$0	($15)	($21)	($22)	'

Earnings_Per_Share_Earnings_Pe1

Earnings Per Share Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Anti-dilutive common stock equivalents excluded from computation (in shares)	0	0	0	0
Net income	$19,817	$12,567	$43,827	$45,852
Less: Net (income) loss attributable to redeemable noncontrolling interest	-1,534	-2,306	4,879	-1,458
Net income attributable to common shareholders	$18,283	$10,261	$48,706	$44,394
Basic weighted average shares outstanding (in shares)	44,317,000	43,822,000	44,254,000	43,744,000
Dilutive potential shares from restricted stock units (in shares)	789,000	715,000	743,000	695,000
Diluted weighted average shares outstanding (in shares)	45,106,000	44,537,000	44,997,000	44,439,000
Basic earnings per share attributable to common shareholders (in dollars per share)	$0.41	$0.23	$1.10	$1.01
Diluted earnings per share attributable to common shareholders (in dollars per share)	$0.41	$0.23	$1.08	$1

Income_Taxes_Details

Income Taxes (Details) (U.S. Federal, State, local and foreign taxes)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
U.S. Federal, State, local and foreign taxes	'	'	'	'
Income Taxes [Line Items]	'	'	'	'
Effective Income Tax Rate, Adjusted	'	36.00%	38.00%	36.00%
Effective Income Tax Rate Reconciliation, Percent	38.00%	33.00%	37.50%	35.00%
Effective income tax rate, expected for fiscal year	'	'	38.00%	'

Regulatory_Requirements_Detail

Regulatory Requirements (Details) (USD $)	Sep. 30, 2013
Securities Registered Domestically	'
Financial Instruments Owned and Pledged as Collateral [Line Items]	'
Net Capital	$2,616,000
Excess Capital	2,528,000
Foreign Country	'
Financial Instruments Owned and Pledged as Collateral [Line Items]	'
Net Capital	47,863,000
Excess Capital	$44,797,000

Related_Party_Transactions_Det

Related Party Transactions (Details) (Affiliated Funds, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Affiliated Funds	'	'	'	'
Related Party Transactions, Revenue [Abstract]	'	'	'	'
Investment advisory and administrative fees	$48,264	$41,001	$141,792	$113,847
Distribution and service fees	3,627	2,881	10,802	8,129
Total	$51,891	$43,882	$152,594	$121,976

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (Affiliated Funds, USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Related Party Transaction [Line Items]	'	'	'	'	'
Advisory fees waived	'	$0	'	$299,000	'
Fund expenses, included in general and administrative expenses	2,629,000	1,214,000	7,353,000	4,735,000	'
Receivables, company sponsored mutual funds	$17,814,000	'	$17,814,000	'	$18,133,000
Maximum	'	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'	'
Investment advisory agreement term	'	'	'10 years	'	'

Sales_Proceeds_and_Realized_Ga

(Sales Proceeds and Realized Gain (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain (Loss) on Investments [Line Items]	'	'	'	'
Proceeds from sales	'	'	$20,244	$23,720
Gross realized gain	283	562	1,846	1,704
Company-sponsored mutual funds	'	'	'	'
Gain (Loss) on Investments [Line Items]	'	'	'	'
Proceeds from sales	102	0	10,715	103
Gross realized gain	2	0	615	4
Dividend income	$0	$0	$0	$2

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Commitments	'
Loss Contingencies [Line Items]	'
Long-term Purchase Commitments, Time Period	'12 years
commitment to invest	'
Loss Contingencies [Line Items]	'
Long-term purchase commitment	5.1
Long-term committment, funded amount	2.5

Concentration_of_Credit_Risk_C

Concentration of Credit Risk Concentration of Credit Risk (Details)	Sep. 30, 2013
	financial_institution
Concentration of Credit Risk [Abstract]	'
Number Of Financial Institutions	3

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Nov. 06, 2013
					Dividend Declared
					Subsequent Event
Subsequent Event [Line Items]	'	'	'	'	'
Quarterly cash dividends declared	'	'	'	'	$0.20
Special cash dividends declared per share	$0.20	$0.18	$0.60	$0.54	$1