Cohen & Steers (CNS) 10-K 14 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 12, 2014	Jun. 28, 2013
Entity Information	'	'	'
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-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	44,733,986	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$641,000,000

Consolidated_Statements_of_Fin

Consolidated Statements of Financial Condition (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'		'
Cash and cash equivalents	$128,277		$95,412
Securities owned ($26,002) ($7,300 and $849)	15,668	[1],[2]	97,155	[1],[2]
Equity method investments	24,724		8,106
Investments, available-for-sale	10,449		25,322
Accounts receivable	40,888		44,397
Due from broker ($12,358)	2,906	[1]	17,617	[1]
Property and equipment—net	9,824		9,103
Goodwill	20,672		20,122
Intangible assets—net	1,701		1,790
Deferred income tax asset—net	14,144		10,171
Other assets ($103)	5,673	[1]	8,120	[1]
Total assets	274,926		337,315
Liabilities:	'		'
Accrued compensation	25,214		25,845
Securities sold but not yet purchased ($14,685)	0	[1]	14,685	[1]
Income tax payable	7,575		8,836
Other liabilities and accrued expenses ($335)	18,373	[1]	18,181	[1]
Total liabilities	51,162		67,547
Commitments and contingencies	'		'
Redeemable noncontrolling interest	207		53,188
Stockholders’ equity:	'		'
Common stock, $0.01 par value; 500,000,000 shares authorized; 47,735,793 and 47,002,117 shares issued at December 31, 2013 and December 31, 2012, respectively	477		470
Additional paid-in capital	457,138		429,377
Accumulated deficit	-131,366		-117,889
Accumulated other comprehensive income, net of tax	2,989		2,341
Less: Treasury stock, at cost, 3,481,942 and 3,239,093 shares at December 31, 2013 and December 31, 2012, respectively	-105,681		-97,719
Total stockholders’ equity	223,557		216,580
Total liabilities and stockholders’ equity	$274,926		$337,315
[1]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of December 31, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.

Consolidated_Statements_of_Fin1

Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Common stock, par value	$0.01		$0.01
Common stock, shares authorized	500,000,000		500,000,000
Common stock, shares issued	47,735,793		47,002,117
Common stock, shares outstanding	44,253,851		43,763,024
Treasury stock, shares	3,481,942		3,239,093
Securities owned	$15,668	[1],[2]	$97,155	[1],[2]
Due from broker	2,906	[1]	17,617	[1]
Other assets	5,673	[1]	8,120	[1]
Securities sold but not yet purchased	0	[1]	14,685	[1]
Other liabilities	18,373	[1]	18,181	[1]
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
Securities Owned	'		'
Securities owned and pledged as collateral - ACOM & RAP	$7,300		$849
[1]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of December 31, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:	'	'	'
Investment advisory and administration fees	$271,109	$244,529	$221,879
Distribution and service fees	14,359	11,334	9,718
Portfolio consulting and other	12,245	17,690	5,649
Total revenue	297,713	273,553	237,246
Expenses:	'	'	'
Employee compensation and benefits	94,707	88,517	84,371
Distribution and service fees	41,247	41,270	23,867
General and administrative	46,802	39,431	35,204
Depreciation and amortization	5,606	5,562	5,056
Amortization, deferred commissions	3,009	2,341	1,744
Total expenses	191,371	177,121	150,242
Operating income	106,342	96,432	87,004
Non-operating income:	'	'	'
Interest and dividend income—net	2,280	2,530	1,068
(Loss) gain from trading securities—net	-6,612	4,082	39
Gain from available-for-sale securities—net	2,259	1,237	376
Equity in earnings (losses) of affiliates	840	1,050	-3,021
Other (loss) gain	-745	-1,028	1,395
Total non-operating (loss) income	-1,978	7,871	-143
Income before provision for income taxes	104,364	104,303	86,861
Provision for income taxes	41,109	36,407	32,584
Net income	63,255	67,896	54,277
Less: Net loss (income) attributable to redeemable noncontrolling interest	4,864	-1,779	30
Net income attributable to common shareholders	$68,119	$66,117	$54,307
Earnings per share attributable to common shareholders:	'	'	'
Basic	$1.54	$1.51	$1.26
Diluted	$1.51	$1.49	$1.23
Weighted average shares outstanding:	'	'	'
Basic	44,272	43,766	43,190
Diluted	45,083	44,482	43,975

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$63,255	$67,896	$54,277
Less: Net loss (income) attributable to redeemable noncontrolling interest	4,864	-1,779	30
Net income attributable to common shareholders	68,119	66,117	54,307
Foreign currency translation gain (loss), net of tax of zero	1,279	751	-1,037
Net unrealized gain (loss) from available-for-sale securities, net of tax of zero	1,628	3,052	-1,783
Reclassification to statements of operations of gain from available-for-sale securities, net of tax of zero	-2,259	-1,237	-376
Total comprehensive income attributable to common shareholders	$68,767	$68,683	$51,111

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest (USD $)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss), Net of Tax	Treasury Stock	Total Stockholders' Equity	Redeemable Noncontrolling Interest
In Thousands, except Share data
Beginning balance (redeemable noncontrolling Interest at Dec. 31, 2010	'	'	'	'	'	'	'	$0
Beginning balance at Dec. 31, 2010	'	454	378,081	-65,553	2,971	-82,588	233,365	'
Beginning balance (shares of common stock, net) at Dec. 31, 2010	'	42,640,000	'	'	'	'	'	'
Dividends	'	0	0	-71,817	0	0	-71,817	'
Issuance of common stock	'	8	531	0	0	0	539	0
Issuance of common stock, shares	'	760,000	'	'	'	'	'	'
Repurchase of common stock	'	0	0	0	0	-6,647	-6,647	0
Repurchase of common stock, shares	'	-232,000	'	'	'	'	'	'
Tax benefits associated with restricted stock units—net	'	0	1,987	0	0	0	1,987	0
Issuance of restricted stock units	2,699	0	3,382	0	0	0	3,382	0
Amortization of restricted stock units—net	'	0	18,594	0	0	0	18,594	0
Forfeitures of vested restricted stock units	'	0	-2	0	0	0	-2	0
Net income (loss)	54,277	0	0	54,307	0	0	54,307	-30
Other comprehensive income (loss), net of tax	'	0	0	0	-3,196	0	-3,196	0
Distributions to redeemable noncontrolling interest	'	0	0	0	0	0	0	-744
Contributions from redeemable noncontrolling interest	0	0	0	0	0	0	0	744
Redemption of redeemable noncontrolling interest	'	0	0	0	0	0	0	-3,734
Foreign currency translation adjustment on redeemable noncontrolling Interest	'	0	0	0	0	0	0	437
Transfer of redeemable noncontrolling interest in consolidated entity (Consolidation)	'	0	0	0	0	0	0	8,123
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2011	'	'	'	'	'	'	'	4,796
Ending balance at Dec. 31, 2011	'	462	402,573	-83,063	-225	-89,235	230,512	'
Ending balance (shares of common stock, net) at Dec. 31, 2011	'	43,168,000	'	'	'	'	'	'
Dividends	'	0	0	-100,943	0	0	-100,943	'
Issuance of common stock	'	8	498	0	0	0	506	0
Issuance of common stock, shares	'	847,000	'	'	'	'	'	'
Repurchase of common stock	'	0	0	0	0	-8,484	-8,484	0
Repurchase of common stock, shares	'	-252,000	'	'	'	'	'	'
Tax benefits associated with restricted stock units—net	'	0	4,223	0	0	0	4,223	0
Issuance of restricted stock units	3,735	0	4,594	0	0	0	4,594	0
Amortization of restricted stock units—net	'	0	17,490	0	0	0	17,490	0
Forfeitures of vested restricted stock units	'	0	-1	0	0	0	-1	0
Net income (loss)	67,896	0	0	66,117	0	0	66,117	1,779
Other comprehensive income (loss), net of tax	'	0	0	0	2,566	0	2,566	0
Distributions to redeemable noncontrolling interest	'	0	0	0	0	0	0	-8,438
Contributions from redeemable noncontrolling interest	55,132	0	0	0	0	0	0	55,132
Foreign currency translation adjustment on redeemable noncontrolling Interest	'	0	0	0	0	0	0	-81
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2012	'	'	'	'	'	'	'	53,188
Ending balance at Dec. 31, 2012	216,580	470	429,377	-117,889	2,341	-97,719	216,580	'
Ending balance (shares of common stock, net) at Dec. 31, 2012	43,763,024	43,763,000	'	'	'	'	'	'
Dividends	'	0	0	-81,596	0	0	-81,596	'
Issuance of common stock	'	7	473	0	0	0	480	0
Issuance of common stock, shares	'	734,000	'	'	'	'	'	'
Repurchase of common stock	'	0	0	0	0	-7,962	-7,962	0
Repurchase of common stock, shares	'	-243,000	'	'	'	'	'	'
Tax benefits associated with restricted stock units—net	'	0	3,146	0	0	0	3,146	0
Issuance of restricted stock units	1,901	0	2,689	0	0	0	2,689	0
Amortization of restricted stock units—net	'	0	21,463	0	0	0	21,463	0
Forfeitures of vested restricted stock units	'	0	-10	0	0	0	-10	0
Net income (loss)	63,255	0	0	68,119	0	0	68,119	-4,864
Other comprehensive income (loss), net of tax	'	0	0	0	648	0	648	0
Distributions to redeemable noncontrolling interest	'	0	0	'	0	0	0	-14,242
Contributions from redeemable noncontrolling interest	37,711	0	0	0	0	0	0	37,711
Transfer of redeemable noncontrolling interest in consolidated entity (Deconsolidation)	-71,586	0	0	0	0	0	0	-71,586
Ending balance (redeemable noncontrolling interest) at Dec. 31, 2013	'	'	'	'	'	'	'	207
Ending balance at Dec. 31, 2013	$223,557	$477	$457,138	($131,366)	$2,989	($105,681)	$223,557	'
Ending balance (shares of common stock, net) at Dec. 31, 2013	44,253,851	44,254,000	'	'	'	'	'	'

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity and Redeemable Noncontrolling Interest (parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividends declared per share	$1.80	$2.22	$1.60

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income	$63,255	$67,896	$54,277
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Stock compensation expense	21,539	17,562	18,675
Amortization, deferred commissions	3,009	2,341	1,744
Depreciation and amortization	5,606	5,562	5,056
Deferred rent	1,954	711	-530
Loss (gain) from trading securities—net	6,612	-4,082	-39
Equity in (earnings) losses of affiliates	-840	-1,050	3,021
Gain from available-for-sale securities—net	-2,259	-1,237	-376
Deferred income taxes	-3,087	-173	-415
Foreign currency loss (gain)	622	572	-829
Changes in operating assets and liabilities:	'	'	'
Accounts receivable	2,887	-5,379	-5,940
Due from broker	-8,826	-10,562	-3,699
Deferred commissions	-2,399	-2,981	-1,915
Securities owned	-11,573	-65,347	7,393
Other assets	1,542	-1,655	-1,597
Accrued compensation	-152	3,039	3,445
Securities sold but not yet purchased	-14,685	6,251	-599
Income tax payable	-1,026	4,445	-4,388
Other liabilities and accrued expenses	13,693	4,430	-839
Net cash provided by operating activities	75,872	20,343	72,445
Cash flows from investing activities:	'	'	'
Proceeds from redemption of equity method investments	7,741	811	8,800
Purchases of investments, available-for-sale	-10,195	-20,733	-37,611
Proceeds from sales of investments, available-for-sale	26,700	25,736	28,703
Purchases of property and equipment	-6,230	-3,361	-2,927
Net cash provided by (used in) investing activities	18,016	2,453	-3,035
Cash flows from financing activities:	'	'	'
Excess tax benefits associated with restricted stock units	2,025	2,905	1,483
Issuance of common stock	408	439	466
Repurchase of common stock	-7,962	-8,484	-6,647
Dividends to stockholders	-79,695	-97,208	-69,118
Redemptions of redeemable noncontrolling interest	-14,242	-8,438	-3,734
Contributions from redeemable noncontrolling interest	37,711	55,132	0
Net cash used in financing activities	-61,755	-55,654	-77,550
Net increase (decrease) in cash and cash equivalents	32,133	-32,858	-8,140
Effect of foreign exchange rate changes on cash and cash equivalents	732	446	-227
Cash and cash equivalents, beginning of the year	95,412	127,824	136,191
Cash and cash equivalents, end of the year	$128,277	$95,412	$127,824

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	0 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Nov. 14, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 01, 2011	Feb. 23, 2011
Income taxes paid, net	'	($43,483)	($29,298)	($35,724)	'	'
Restricted stock units issued and vested in period	'	789	858	683	'	'
Issuance of restricted stock units	'	1,901	3,735	2,699	'	'
Transfer of redeemable noncontrolling interest in consolidated entity	'	71,586	'	'	'	'
Non-cash increase in equity method investments	'	23,519	'	'	'	'
Stock redeemed during period	3,062	'	'	'	'	'
Non-cash reclassifications from equity method investments	'	'	'	'	$18,444	$5,838

Basis_of_Presentation

Basis of Presentation	12 Months Ended
	Dec. 31, 2013
Organization and Description of Business [Abstract]	'
Organization and Description of Business	'
	Basis of Presentation
	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 consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America. The 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 SPRL (formerly known as Cohen & Steers Europe S.A.) is a wholly-owned subsidiary of Cohen & Steers UK Limited (collectively, the “Company”). Prior to a reorganization in February 2013, Cohen & Steers Europe SPRL was a wholly-owned subsidiary of the Company. 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.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Accounting Estimates—The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Management believes the estimates used in preparing the 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 records 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, represent securities held within the affiliated funds that the Company consolidates and are measured at fair value based on quoted market prices, market prices obtained from independent pricing services engaged by management or as determined by the Company’s valuation committee. Unrealized gains and losses are recorded as gain (loss) from trading securities—net in the Company’s 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 December 31, 2013, the Company's equity method investments consisted of interests in affiliated 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 gains and losses, net of tax, reported in accumulated other comprehensive income. The Company periodically reviews each individual security position that has an unrealized loss, or impairment, to determine if that impairment is other than temporary. If the Company believes an impairment of a security position is other than temporary, the loss will be recognized in the Company’s consolidated statements of operations. An other than temporary impairment is 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 affiliated funds consolidated by the Company enter into derivative contracts to gain exposure to the underlying commodities markets or to hedge market and credit risks of the underlying portfolios utilizing options, total return swaps, credit default swaps and futures contracts. These instruments are measured at fair value with gains and losses recorded as gain (loss) from trading securities—net in the Company's 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 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 gains and losses recorded in other non-operating income in the Company's 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 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 are included in distribution and service fees expense on the accompanying consolidated statements of operations for the years ended December 31, 2013 and December 31, 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 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.
	Currency Translation and Transactions—Assets and liabilities of subsidiaries having non-U.S. dollar functional currencies are translated at exchange rates at the applicable consolidated statement of financial condition date. Revenue and expenses are translated at average exchange rates during the period. The gains or losses resulting from translating non-U.S. dollar functional currency into U.S. dollars is included in the Company's consolidated statements of comprehensive income. Gains or losses resulting from non-U.S. dollar currency transactions are included in other non-operating income in the consolidated statements of operations. The cumulative translation adjustment was $2,264,000, $985,000 and $234,000 as of December 31, 2013, December 31, 2012 and December 31, 2011, respectively.
	Comprehensive Income—The Company reports all changes in comprehensive income in the consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common stockholders, foreign currency translation gain and loss (net of tax), unrealized gain and loss from available-for-sale securities (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 December 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance to provide a single definition of public business entity for use in future financial accounting and reporting guidance. The guidance specifies that an entity that is required by the Securities and Exchange Commission (“SEC”) to file or furnish financial statements with the SEC, or does file or furnish financial statements with the SEC, is considered a public business entity. Additionally, a consolidated subsidiary of a public company is not considered a public business entity for purposes of its standalone financial statements other than those included in an SEC filing by its parent or by other registrants or those that are issuers and are required to file or furnish financial statements with the SEC. This new guidance will be effective for all future accounting updates starting from 2014. The adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.
	In July 2013, the 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 adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.
	In June 2013, the FASB issued new guidance which clarifies the characteristics of an investment company and provides guidance for assessing whether an entity is an investment company. From time to time the Company consolidates certain of its affiliated funds which are considered investment companies. The Company retains the specialized investment company accounting for such funds in consolidation. This new guidance will be effective for the Company’s first quarter of 2014. The adoption of this new guidance will not have a material impact on the Company’s 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 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 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 Measurement (“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 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 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 consolidated financial statements.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill and intangible assets recorded in the Company's consolidated statements of financial condition relate to the acquisition of Cohen & Steers Europe SPRL (formerly known as Cohen & Steers Europe S.A.) during 2006.
	The following summarizes the changes in the Company's goodwill and intangible assets during the years ended December 31, 2013 and 2012 (in thousands):
		Goodwill				Finite Lived Intangible				Indefinite Lived
						Assets				Intangible Assets
	Balance at January 1, 2012	$	19,934			$	629			$	1,250
	Currency revaluation	188				—				—
	Amortization during 2012	—				(89		)		—
	Balance at December 31, 2012	$	20,122			$	540			$	1,250
	Currency revaluation	550				—				—
	Amortization during 2013	—				(89		)		—
	Balance at December 31, 2013	$	20,672			$	451			$	1,250
	The following is a summary of the intangible assets at December 31, 2013 and December 31, 2012 (in thousands):
		Remaining		Gross				Accumulated				Intangible
		Amortization		Carrying				Amortization				Assets, Net
		Period		Amount
		(in months)
	2013
	Amortized intangible assets:
	Client relationships	60		$	1,543			$	(1,092	)		$	451
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250				—				1,250
	Total			$	2,793			$	(1,092	)		$	1,701
	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 expenses related to the intangible assets was approximately $89,000 for each of the years ended December 31, 2013, 2012 and 2011, respectively. Estimated future amortization expense is as follows (in thousands):
	Periods Ending December 31,	Estimated
		Amortization
		Expense
	2014	$	89
	2015	89
	2016	89
	2017	89
	2018	95
	Thereafter	—
	Total	$	451

Investments

Investments	12 Months Ended
	Dec. 31, 2013
Investments [Abstract]	'
Investment Holdings	'
	Investments
	The following is a summary of the Company's investments as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013			December 31, 2012
	Securities owned	$	15,668		$	97,155
	Equity method investments	24,724			8,106
	Investments, available-for-sale	10,449			25,322
	Trading and equity method investments
	The Cohen & Steers MLP & Energy Opportunity Fund, Inc. (“MLO”), which was launched by the Company in December 2013, is an open-end mutual fund for which the Company is the investment manager. As of December 31, 2013, the Company owned all of the voting interest in MLO. Accordingly, the underlying assets and liabilities and results of operations of MLO have been included in the Company's consolidated financial statements.
	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
	December 31, 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 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 the primary beneficiary. As the general partner, the Company has significant influence over the financial decisions of GRP-TE and therefore records its investment using the equity method of accounting. The Company's 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 December 31, 2013, the fair value of the Company's equity interest in GRP-TE was approximately $116,000. 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 13 for further discussion regarding the Company's co-investment commitment. As of December 31, 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 consolidated financial statements.
	During 2008, the Company launched the Onshore Fund which is structured as a partnership. The Company is the general partner and investment manager of the Onshore Fund. As of December 31, 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 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 consolidated statements of financial condition attributable to the consolidated Onshore Fund as of December 31, 2012 when it was considered a VIE. 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):
		December 31, 2012
	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 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 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 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 consolidated financial statements for the year ended December 31, 2012.
	The following is a summary of the fair value of securities owned and equity method investments as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013						December 31, 2012
		Securities Owned			Equity Method Investments			Securities Owned			Equity Method Investments
	ACOM	$	7,300		$	—		$	—		$	—
	GRP-CIP	2,740			—			2,142			—
	GRP-TE	—			116			—			89
	MLO	5,125			—			—			—
	Offshore Fund	—			412			—			8,017
	Onshore Fund	503			—			26,002			—
	RAP	—			24,196			69,011			—
	Total	$	15,668		$	24,724		$	97,155		$	8,106
	Gain (loss) from trading securities—net for the years ended December 31, 2013, 2012 and 2011, which represent realized and unrealized gains and losses recorded by the funds the Company consolidates, are summarized below (in thousands):
		Years Ended December 31,
		2013			2012			2011
	ACOM	$	(484	)	$	—		$	—
	GLIF	—			142			(145		)
	GRP-CIP	356			55			—
	MLO	155			—			—
	Onshore Fund	495			2,994			184
	RAP	(7,134		)	891			—
	Total (loss) gain from trading securities—net	$	(6,612	)	$	4,082		$	39
	Equity in earnings (losses) of affiliates for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Years Ended December 31,
		2013			2012			2011
	GLIF	$	—		$	—		$	76
	GRP-TE	13			—			—
	Offshore Fund	149			1,050			(878		)
	Onshore Fund	—			—			(2,219		)
	RAP	678			—			—
	Total equity in earnings (losses) of affiliates	$	840		$	1,050		$	(3,021	)
	Available-for-sale
	The following is a summary of the cost, gross unrealized gains, gross unrealized losses and fair value of investments, available-for-sale as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
Gains					Losses <
					12 months
Preferred securities	$	4,142		$	183		$	(40	)	$	4,285
Common stocks	5,400			698			(132		)	5,966
Company-sponsored mutual funds	197			1			—			198
Total investments, available-for-sale	$	9,739		$	882		$	(172	)	$	10,449
	December 31, 2012
	Cost			Gross			Gross			Fair
				Unrealized			Unrealized			Value
				Gains			Losses <
							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
The aggregate fair value of available-for-sale securities in an unrealized loss position was approximately $1,785,000 and $5,630,000 at December 31, 2013 and December 31, 2012, respectively.
Unrealized losses on investments, available-for-sale as of December 31, 2013 were 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 December 31, 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 gains and losses from investments, available-for-sale for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
	Years Ended December 31,
	2013			2012			2011
Proceeds from sales	$	26,541		$	25,736		$	28,703
Gross realized gains	2,743			1,918			1,509
Gross realized losses	(484		)	(681		)	(1,133		)

Fair_Value

Fair Value	12 Months Ended
	Dec. 31, 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.
	•	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 December 31, 2013 (in thousands):
		Level 1				Level 2				Level 3				Total
	Cash equivalents (1)	$	61,551			$	—			$	—			$	61,551
	Securities owned
	Common stocks	$	5,125			$	—			$	503			$	5,628
	Fixed income securities	—				7,300				—				7,300
	Limited partnership interests	—				—				2,740				2,740
	Total securities owned	$	5,125			$	7,300			$	3,243			$	15,668
	Equity method investments	$	24,196			$	—			$	528			$	24,724
	Investments, available-for-sale
	Preferred securities	$	960			$	—			$	3,325			$	4,285
	Common stocks	5,966				—				—				5,966
	Company-sponsored mutual funds	198				—				—				198
	Total investments, available-for-sale	$	7,124			$	—			$	3,325			$	10,449
	Derivatives - assets
	Foreign exchange contracts	$	—			$	398			$	—			$	398
	Commodity contracts	305				—				—				305
	Total derivatives - assets	$	305			$	398			$	—			$	703
	Derivatives - liabilities
	Commodity contracts	$	275			$	—			$	—			$	275
	Total derivatives - liabilities	$	275			$	—			$	—			$	275
	_________________________
	(1) Comprised of investments in money market funds.
	Approximately $16,744,000 of securities owned classified as level 2 at December 31, 2012 were transfered to level 1 securities during the year ended December 31, 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 year ended December 31, 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 were 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 year ended December 31, 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 December 31, 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 of a closed-end fund 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 presents fair value measurements as of December 31, 2012 (in thousands):
		Level 1				Level 2				Level 3				Total
	Cash equivalents (1)	$	20,204			$	—			$	—			$	20,204
	Due from broker (1)	$	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	$	14,685			$	—			$	—			$	14,685
	_________________________
(1) 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 represent the Company's investment 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 of a closed-end fund 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 years ended December 31, 2013 and 2012 (in thousands):
	Securities									Equity Method Investments					Investments, available-for-sale
	Owned
	Common Stocks					Limited Partnership Interests				GRP-TE/Offshore Fund					Preferred Securities
Balance at January 1, 2012	$	1,275				$	—			$	—				$	4,150
Purchases / contributions	628					2,080				89					125
Sales / distributions	—					—				—					(1,213		)
Realized gains	—					—				—					100
Unrealized (losses) gains (4)	(107		)			62				—					6
Transfers out of level 3	(628		)	(2	)	—				—					(88		)	(3	)
Balance at December 31, 2012	$	1,168				$	2,142			$	89				$	3,080
Purchases / contributions	—					393				15					—
Sales / distributions	(419		)			(151		)		(7,066		)			—
Realized gains (losses)	(211		)			11				—					—
Unrealized gains (losses) (4)	(35		)			345				54					245
Transfers into level 3	—					—				7,436			(1	)	—
Balance at December 31, 2013	$	503				$	2,740			$	528				$	3,325
_________________________
(1) Transferred from level 2 to level 3 during the year ended December 31, 2013 due to the imposition of redemption restrictions on the Company's investment in connection with the winding down of the operations of the Offshore Fund.
(2) Transferred from level 3 to level 2 because observable market data became available for the securities during the year ended December 31, 2012.
(3) Transferred from level 3 to level 1 because securities started trading actively on an exchange during the year ended December 31, 2012.
(4) Pertains to unrealized gains (losses) from securities held at December 31, 2013 and 2012, respectively.
Realized gains (losses) from investments classified as securities owned, equity method investments and investments, available-for-sale in the above table 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 consolidated statements of operations. Unrealized gains (losses) from investments classified as securities owned and equity method investments in the above table was recorded as gain (loss) from trading securities and equity in earnings (losses) of affiliates, respectively, in the Company's consolidated statements of operations. Unrealized gains (losses) from investments, available-for-sale in the above table was recorded as unrealized gain (loss) from available-for-sale securities in the Company's 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 December 31, 2013 were (in thousands):
	Fair Value				Fair Value		Significant		Input /
	(in thousands)				Methodology		Unobservable Inputs		Range
Common shares of privately-held company	$	503			Market comparable companies		Price / tangible book ratio		1.48x
							Liquidity discount		33.36%
Limited partnership interests - direct investments in real estate	$	2,101			Discounted cash flows		Discount rate		9% - 15%
							Exit capitalization rates		8.5% - 9%
							Market rental rates		$15.00 - 16.25 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		Input /
	(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 cost		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	12 Months Ended
	Dec. 31, 2013
Derivatives [Abstract]	'
Derivatives and Fair Value [Text Block]	'
	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 December 31, 2013 and December 31, 2012 (in thousands):
		31-Dec-13
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total foreign exchange contracts	$	10,853		$	398		$	—		$	—
	Total commodity contracts	8,115			305			5,738			275
	Total derivatives	$	18,968		$	703		$	5,738		$	275
		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 December 31, 2013, cash included in due from broker and securities included in securities owned in the consolidated statement of financial condition of approximately $2,110,000 and $7,300,000, 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 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.
	Gains and losses from derivative financial instruments for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Equity contracts	$	(584	)	$	125		$	(77	)
	Foreign exchange contracts	(218		)	686			—
	Commodity contracts	(3,689		)	(517		)	—
	Credit contracts	(21		)	(38		)	(14		)
	Total derivatives	$	(4,512	)	$	256		$	(91	)

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment	'
	Property and Equipment
	The following is a summary of property and equipment at December 31, 2013 and 2012 (in thousands):
		At December 31,
		2013			2012
	Equipment	$	8,606		$	5,539
	Furniture and fixtures	3,487			3,465
	Software	13,405			10,366
	Leasehold improvements	11,374			11,346
	Subtotal	36,872			30,716
	Less: Accumulated depreciation and amortization	(27,048		)	(21,613		)
	Property and equipment, net	$	9,824		$	9,103
	Depreciation and amortization expense related to property and equipment was $5,517,000, $5,473,000 and $4,967,000 for the years ended December 31, 2013, 2012 and 2011, respectively.
	Depreciation and amortization expense is recorded using the straight-line method over the estimated useful lives of the related assets which range from 3-7 years.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic earnings per share are calculated by dividing net income attributable to common stockholders by the weighted average shares outstanding. Diluted earnings per share are calculated by dividing net income attributable to common stockholders by the total weighted average shares of common stock outstanding and common stock equivalents. Common stock equivalents are comprised of dilutive potential shares from restricted stock unit awards. Common stock equivalents are excluded from the computation if their effect is anti-dilutive. Diluted earnings per share are computed using the treasury stock method.
	No anti-dilutive common stock equivalents were excluded from the computation for the years ended December 31, 2013 and 2012. Anti-dilutive common stock equivalents of approximately 2,000 shares were excluded from the computation for the year ended December 31, 2011.
	The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the years ended December 31, 2013, 2012 and 2011 (in thousands, except per share data):
		Years Ended December 31,
		2013		2012			2011
	Net income	$	63,255	$	67,896		$	54,277
	Less: Net loss (income) attributable to redeemable noncontrolling interest	4,864		(1,779		)	30
	Net income attributable to common stockholders	$	68,119	$	66,117		$	54,307
	Basic weighted average shares outstanding	44,272		43,766			43,190
	Dilutive potential shares from restricted stock units	811		716			785
	Diluted weighted average shares outstanding	45,083		44,482			43,975
	Basic earnings per share attributable to common stockholders	$	1.54	$	1.51		$	1.26
	Diluted earnings per share attributable to common stockholders	$	1.51	$	1.49		$	1.23

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Compensation Related Costs, Share-Based Payments [Text Block]	'
	Stock-Based Compensation
	Amended and Restated Stock Incentive Plan
	The Amended and Restated Cohen & Steers, Inc. Stock Incentive Plan (the “SIP”) provides for the issuance of Restricted Stock Units (“RSUs”), stock options and other stock-based awards for a period of up to ten years to eligible employees and directors. A total of 16.0 million shares of common stock may be granted under the SIP. At December 31, 2013, RSUs with respect to approximately 12.1 million shares of common stock were issued. Total compensation cost related to unvested RSUs not yet recognized was approximately $39,742,000 at December 31, 2013 and is expected to be recognized over approximately the next three years.
	Restricted Stock Units
	Vested Restricted Stock Unit Grants
	The Company has granted awards of vested RSUs to the independent directors of the Company pursuant to the SIP. The directors are entitled to receive delivery of the underlying common stock on the third anniversary of the date of the grant. Dividends declared during the delayed delivery period are paid to the directors in cash. At December 31, 2013, vested RSUs with respect to approximately 29,000 shares of common stock were outstanding pursuant to these grants. In connection with the grant of these vested RSUs, the Company recorded non-cash stock-based compensation expense of approximately $300,000, $326,000 and $300,000 for the years ended December 31, 2013, 2012 and 2011, respectively.
	The following table sets forth activity relating to the Company's granted awards of vested RSUs under the SIP for awards to the independent directors (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	46		$	19.66
	Granted	10		29.12
	Delivered	(11	)	27.63
	Balance at December 31, 2011	45		19.9
	Granted	10		31.77
	Delivered	(21	)	13.79
	Balance at December 31, 2012	34		27.46
	Granted	9		33.83
	Delivered	(14	)	22.79
	Balance at December 31, 2013	29		31.47
	Unvested Restricted Stock Unit Grants
	The Company grants awards of unvested RSUs to certain employees pursuant to the SIP. The fair value at the date of grant is expensed on a straight-line basis over the applicable service periods. Except in circumstances where a dividend is determined to be an extraordinary dividend in the sole discretion of the Company's Compensation Committee (in which case dividend equivalents are accrued on such RSUs in the form of additional unvested RSUs), dividends are not paid to the holders of such unvested RSUs. At December 31, 2013, RSUs with respect to approximately 950,000 shares of common stock were outstanding pursuant to these grants. Amortization expense related to the unearned stock-based compensation, net of forfeitures, was approximately $8,491,000, $7,328,000 and $8,224,000 for the years ended December 31, 2013, 2012 and 2011, respectively.
	The following table sets forth activity relating to the Company's granted awards under the above mentioned plans (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	1,432		$	21.07
	Granted	253		28.98
	Delivered	(369	)	22.47
	Forfeited	(37	)	21.98
	Balance at December 31, 2011	1,279		22.21
	Granted	100		32.34
	Delivered	(346	)	23.57
	Forfeited	(54	)	20.75
	Balance at December 31, 2012	979		22.85
	Granted	305		34.2
	Delivered	(307	)	21.95
	Forfeited	(27	)	25.28
	Balance at December 31, 2013	950		26.72
	Incentive Bonus Plans for Employees of the Company
	The Company has implemented two programs for employees under which (i) based upon compensation levels, it automatically pays a portion of their year-end bonuses in the form of unvested RSUs (“Mandatory Plan”) and (ii) employees can elect to defer, on a pre-tax basis, an additional portion of their year-end bonus in the form of vested RSUs (“Voluntary Plan”). These RSUs are issued pursuant to the SIP. Under both plans, the Company matches a predetermined amount of the employee contribution in the form of unvested RSUs. Dividend equivalents are accrued on the deferred compensation awards and the matches in the form of additional unvested RSUs. The RSUs under the Mandatory Plan, including the Company match, will vest and be delivered pro-rata over four years. The dividend equivalents issued under the Mandatory Plan vest and will be delivered four years after the date of grant. The RSUs granted under the Voluntary Plan vest immediately at the date of grant and will be delivered three years after the date of grant. The Company match and dividend equivalents under the Voluntary Plan vest and will be delivered three years after the date of grant. The fair value at the date of grant of the RSUs under the Mandatory Plan and the matching under both programs is expensed on a straight-line basis. On May 8, 2012, the Company discontinued the company match on amounts deferred under the Mandatory Plan. All historical grants made pursuant to the company match on amounts deferred under the Mandatory Plan will continue to vest and be delivered in accordance with the previous schedule. Further, on May 8, 2012, the Company discontinued the Voluntary Plan, commencing with performance year 2013. All historical grants made pursuant to the Voluntary Plan, as well as the company match on such grants, will continue to vest and/or be delivered in accordance with the previous schedule. All employees that made an election to voluntarily defer a portion of their 2012 year-end bonus were permitted to defer such optional deferred amount, and received a matching contribution from the company on such optional deferred amount.
	As of December 31, 2013, approximately 1,371,000 and 60,000 RSUs under the Mandatory Plan and Voluntary Plan, respectively, including matching and dividend equivalents, were outstanding. In connection with the grant of the vested RSUs issued under the Voluntary Plan, the Company recorded a non-cash stock-based compensation expense, including amortization on the matching component, of approximately $113,000, $577,000, and $602,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Amortization expense, net of forfeitures, related to the unearned stock-based compensation of the Mandatory Plan, including the matching component, was approximately $12,863,000, $10,069,000 and $10,300,000 for the years ended December 31, 2013, 2012 and 2011, respectively.
	The following table sets forth activity relating to the Company's incentive bonus plans, including Company match and dividend equivalents (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	770		$	24.17
	Granted	740		28.59
	Delivered	(362	)	27.79
	Forfeited	(16	)	25.46
	Balance at December 31, 2011	1,132		25.88
	Granted	692		33.38
	Delivered	(464	)	24.72
	Forfeited	(46	)	30.88
	Balance at December 31, 2012	1,314		30.07
	Granted	587		33.55
	Delivered	(400	)	27.79
	Forfeited	(70	)	32.13
	Balance at December 31, 2013	1,431		32.03
	Employee Stock Purchase Plan
	Pursuant to the Amended and Restated Employee Stock Purchase Plan (“ESPP”), the Company allows eligible employees, as defined in the ESPP, to purchase common stock at a 15% discount from market value with a maximum of $25,000 in annual aggregate purchases by any one individual. The number of shares of common stock authorized for purchase by eligible employees was 600,000. For the years ended December 31, 2013, 2012 and 2011, approximately 13,000, 16,000 and 18,000 shares, respectively, had been purchased by eligible employees through the ESPP. For the years ended December 31, 2013, 2012 and 2011, the Company recorded a non-cash stock-based compensation expense of approximately $72,000, $76,000 and $81,000, respectively, which represents the discount on the shares issued pursuant to this plan. The ESPP will terminate upon the earliest to occur of the following: (1) termination of the ESPP by the board of directors, or (2) issuance of all of the shares reserved for issuance under the ESPP.

401k_and_ProfitSharing_Plan

401(k) and Profit-Sharing Plan	12 Months Ended
	Dec. 31, 2013
Compensation Related Costs [Abstract]	'
401 (k) and Profit-Sharing Plan	'
	401(k) and Profit-Sharing Plan
	The Company sponsors a profit-sharing plan (the “Plan”) covering all employees who meet certain age and service requirements. Subject to limitations, the Plan permits participants to defer up to 100% of their compensation pursuant to Section 401(k) of the Internal Revenue Code. Employee contributions are matched by the Company at $0.50 per $1.00 deferred. The Plan also allows the Company to make discretionary contributions, which are integrated with the taxable wage base under the Social Security Act. No discretionary contributions were made for the years ended December 31, 2013, 2012 and 2011.
	Forfeitures occur when participants terminate employment before becoming entitled to their full benefits under the Plan. Forfeited amounts are used to reduce the Company's contributions to the Plan. Forfeitures for the years ended December 31, 2013, 2012 and 2011 totaled approximately $176,000, $72,000 and $52,000, respectively.
	Matching contributions, net of forfeitures, to the Plan totaled approximately $1,462,000, $1,110,000 and $1,088,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 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 years ended December 31, 2013, 2012 and 2011 (in thousands):
		Years Ended December 31,
		2013		2012		2011
	Investment advisory and administration fees	$	190,058	$	155,931	$	132,320
	Distribution and service fees	14,359		11,334		9,718
		$	204,417	$	167,265	$	142,038
	For the years ended December 31, 2012 and 2011, the Company had investment advisory agreements with certain affiliated closed-end mutual funds, pursuant to which the Company contractually waived approximately $299,000 and $1,826,000, respectively, of advisory fees it was otherwise entitled to receive. There were no such fees waived for the year ended December 31, 2013. 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 December 31, 2013, there were no additional scheduled reductions in advisory fee waivers for any fund.
	Sales proceeds, gross realized gains and dividend income from investments, available-for-sale in Company-sponsored mutual funds for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Years Ended December 31,
		2013		2012		2011
	Proceeds from sales	$	10,715	$	103	$	3,333
	Gross realized gains	615		4		317
	Dividend income	9		3		36
	The Company has agreements with certain affiliated open-end and closed-end mutual funds to reimburse certain fund expenses. For the years ended December 31, 2013, 2012 and 2011, expenses of approximately $9,332,000, $6,345,000 and $6,229,000, respectively, were incurred by the Company pursuant to these agreements and are included in general and administrative expenses.
	Included in accounts receivable at December 31, 2013 and 2012 are receivables due from Company-sponsored mutual funds of approximately $18,026,000 and $18,133,000, respectively.

Regulatory_Requirements

Regulatory Requirements	12 Months Ended
	Dec. 31, 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 December 31, 2013, Securities had net capital of approximately $3,084,000, which exceeded its requirements by approximately $2,977,000. 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 December 31, 2013, the Foreign Regulated Entities had aggregate regulatory capital of approximately $51,796,000, which exceeded requirements by approximately $48,366,000. Effective December 31, 2013, Cohen & Steers Europe SPRL requested, and was granted, a withdrawal of its investment services license with the Belgium Financial Services and Markets Authority.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure	'
	Commitments and Contingencies
	The Company leases office space under noncancelable operating leases expiring at various dates through January 2024. On June 29, 2012, the Company extended the lease for its corporate headquarters in New York City for an added 10 year period through January 2024. The Company subleases some of its office space to a third party under a noncancelable operating lease expiring January 30, 2014. The aggregate minimum future payments under the leases and subleases are as follows (in thousands):
	Years Ended December 31,	Gross Rent Obligations		Sublease Income			Net Rent Obligations
	2014	$	7,914	$	(75	)	$	7,839
	2015	9,004		—			9,004
	2016	8,754		—			8,754
	2017	8,447		—			8,447
	2018	8,447		—			8,447
	Thereafter	47,320		—			47,320
		$	89,886	$	(75	)	$	89,811
	Rent expense charged to operations, including escalation charges for real estate taxes and other expenses, totaled approximately $10,067,000, $8,535,000 and $7,109,000 for the years ended December 31, 2013, 2012 and 2011, respectively. Sublease rental income received for the years ended December 31, 2013, 2012 and 2011 was approximately $876,000, $1,025,000 and $1,010,000, respectively.
	From time to time, the Company is involved in legal matters relating to claims arising in the ordinary course of business. There are currently no such matters pending that the Company believes could have a material adverse effect on its consolidated results of operations, cash flows or financial position.
	The Company periodically commits to fund a portion of the equity in certain of its sponsored investment products. The Company has committed to co-invest up to $5.1 million alongside GRP-TE, a portion of which is made through GRP-TE and the reminder of which is made through GRP-CIP for up to 12 years through the life of GRP-TE. As of December 31, 2013, the Company has funded approximately $2.6 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. The unfunded commitment was not recorded on the Company's consolidated statements of financial condition as of December 31, 2013.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure	'
	Income Taxes
	The provision for income taxes for the years ended December 31, 2013, 2012 and 2011 includes U.S. federal, state, local and foreign taxes. The effective tax rate of approximately of 37.6% for the year ended December 31, 2013 included discrete items, which are items that are unusual or infrequently occurring in nature, the most significant of which was attributable to the launch costs for Cohen & Steers MLP Income and Energy Opportunity Fund, Inc., a closed-end mutual fund. Excluding the discrete items, the effective tax rate for the year ended December 31, 2013 was approximately 38%. The effective tax rate of approximately 35.5% for the year ended December 31, 2012 included discrete items, the most significant of which was attributable to the launch costs for Cohen & Steers Limited Duration Preferred and Income Fund, Inc., a closed-end mutual fund. Excluding the discrete items, the effective tax rate for the year ended December 31, 2012 was approximately 36%. The effective tax rate for the year ended December 31, 2011 was approximately 38%.
	The Company does not provide for deferred taxes on the excess of the financial reporting over the tax basis in its investments in foreign subsidiaries that are essentially permanent in duration. That excess totaled approximately $65,761,000 as of December 31, 2013. The determination of the additional deferred taxes that have not been provided is not practicable because of the complexities of the hypothetical calculation.
	The income before provision for income taxes and provision for income taxes for the years ended December 31, 2013, 2012 and 2011 are as follows (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Income before provision for income taxes - U.S.	$	89,963			$	89,828			$	65,739
	Income before provision for income taxes - Non-U.S.	14,401				14,475				21,122
	Total income before provision for income taxes	$	104,364			$	104,303			$	86,861
	Current taxes:
	U.S. federal	$	36,490			$	29,723			$	24,685
	State and local	5,025				3,754				3,357
	Non-U.S.	2,681				3,103				4,957
		44,196				36,580				32,999
	Deferred taxes:
	U.S. federal	(2,754		)		(92		)		(320		)
	State and local	(379		)		(12		)		(43		)
	Non-U.S.	46				(69		)		(52		)
		(3,087		)		(173		)		(415		)
	Provision for income taxes	$	41,109			$	36,407			$	32,584
	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 records a valuation allowance, when necessary, to reduce deferred tax assets to an amount that more likely than not will be realized.
	Significant components of the Company's net deferred income tax asset at December 31, 2013 and 2012 consist of the following (in thousands):
		At December 31,
		2013				2012
	Deferred income tax assets (liabilities):
	Stock-based compensation	$	7,953			$	6,376
	Non-deductible realized loss on sales of securities	6,706				7,109
	Dividend equivalents on unvested restricted stock units	4,504				3,618
	Unrealized gains on investments	(1,296		)		(1,596		)
	Other	1,687				177
	Subtotal	19,554				15,684
	Less: valuation allowance	(5,410		)		(5,513		)
	Deferred income tax asset - net	$	14,144			$	10,171
	At December 31, 2013, the Company had approximately $5,927,000 of total gross unrecognized tax benefits. Of this total, approximately $3,662,000 (net of the federal benefit on state issues) represents the amount of unrecognized tax benefits that, if recognized, would favorably affect the Company's effective tax rate in future periods. The Company expects to reduce its unrecognized tax benefits by $768,000 within the next twelve months due to the lapse of the statute of limitations on certain positions.
	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):
		Liability for Unrecognized Tax Benefits
	Gross unrecognized tax benefits balance at January 1, 2011	$	4,729
	Addition for tax positions of current year	832
	Addition for tax positions of prior years	52
	Reduction of tax positions from prior years	(901		)
	Gross unrecognized tax benefits balance at December 31, 2011	$	4,712
	Addition for tax positions of current year	933
	Addition for tax positions of prior years	74
	Reduction of tax positions from prior years	(820		)
	Gross unrecognized tax benefits balance at December 31, 2012	$	4,899
	Addition for tax positions of current year	1,421
	Addition for tax positions of prior years	1,597
	Reduction of tax positions from prior years	(1,990		)
	Gross unrecognized tax benefits balance at December 31, 2013	$	5,927
	The Company recognizes potential interest and penalties related to uncertain tax positions in the provision for income taxes. At December 31, 2013 and 2012, the Company had accrued approximately $1,170,000 and $710,000, respectively, in potential interest and penalties associated with uncertain tax positions.
	The tax years 2005 through 2013 remain open to examination by various taxing jurisdictions.
	A reconciliation of the Company's statutory federal income tax rate and the effective tax rate for the years ended December 31, 2013, 2012 and 2011 is as follows:
		Years Ended December 31,
		2013			2012			2011
	U.S. statutory tax rate	35	%		35	%		35	%
	State and local income taxes, net of federal income taxes	4.8	%		4.4	%		4.8	%
	Non-deductibility of loss on securities	—	%		—	%		1.6	%
	Reserve adjustments	0.6	%		(0.1	)%		(0.2	)%
	Non-taxable gains on securities	(0.3	)%		(1.2	)%		—	%
	Foreign operations tax differential	(2.5	)%		(2.4	)%		(4.0	)%
	Other	—	%		(0.2	)%		0.3	%
	Effective income tax rate	37.6	%		35.5	%		37.5	%

Concentration_of_Credit_Risk

Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Concentration of Credit Risk	'
	Concentration of Credit Risk
	The Company's cash and cash equivalents are principally on deposit with three major financial institutions. The Company is subject to credit risk should these financial institutions be unable to fulfill their obligations.
	The following affiliated fund and third party institutional separate account relationship provided 10 percent or more of the total revenue of the Company (in thousands):
		Years Ended December 31,
		2013			2012			2011
	Cohen & Steers Realty Shares, Inc. (CSR):
	Investment advisory and administration fees	$	42,618		$	36,853		$	29,731
	Percent of total revenue	14		%	13		%	13		%
	One Institutional Separate Account Relationship:
	Investment advisory and administration fees	$	36,704		$	40,904		$	41,538
	Portfolio consulting and other	5,510			12,000			907
	Total	$	42,214		$	52,904		$	42,445
	Percent of total revenue	14		%	19		%	18		%
	The table below presents revenue by client domicile for the years ended December 31, 2013, 2012 and 2011 (in thousands):
		Years Ended December 31,
		2013			2012			2011
	United States	$	238,591		$	204,872		$	177,002
	Non - U.S.
	Japan	42,603			53,356			42,735
	Other	16,519			15,325			17,509
	Total	$	297,713		$	273,553		$	237,246
	Subsequent to the issuance of the Company's 2012 annual report on Form 10-K, management determined that $12.1 million and $1.1 million of revenue attributable to Japan for the years ended December 31, 2012 and 2011, respectively, was reported as United States revenue. As a result, United States revenue and Japan revenue have been adjusted to properly reflect the client domicile of such revenue.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Information	'
	Selected Quarterly Financial Data (unaudited)
	The table below presents selected quarterly financial data for 2013 and 2012. The data presented should be read in conjunction with the consolidated financial statements of Cohen & Steers, Inc. and “Management's Discussion and Analysis of Financial Condition and Results of Operations” included herein (in thousands, except per share data):
		Quarter
		1st		2nd		3rd		4th		Total
	2013
	Revenue	$	72,459	$	77,796	$	74,026	$	73,432	$	297,713
	Operating income	20,710		28,557		27,719		29,356		106,342
	Net income attributable to common stockholders	15,141		15,282		18,283		19,413		68,119
	Earnings per share attributable to common stockholders:
	Basic	0.34		0.34		0.41		0.44		1.54
	Diluted	0.34		0.34		0.41		0.43		1.51
	Weighted-average shares outstanding:
	Basic	44,137		44,306		44,317		44,325		44,272
	Diluted	44,882		45,002		45,106		45,338		45,083
	2012
	Revenue	$	63,730	$	67,432	$	71,296	$	71,095	$	273,553
	Operating income	25,396		26,064		12,239		32,733		96,432
	Net income attributable to common stockholders	18,054		16,079		10,261		21,723		66,117
	Earnings per share attributable to common stockholders:
	Basic	0.41		0.37		0.23		0.5		1.51
	Diluted	0.41		0.36		0.23		0.49		1.49
	Weighted-average shares outstanding:
	Basic	43,601		43,808		43,822		43,832		43,766
	Diluted	44,386		44,393		44,537		44,609		44,482

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 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 consolidated financial statements were issued. Other than the items described below, the Company determined that there were no additional subsequent events that required disclosure and/or adjustment.
	On March 14, 2014, CNS declared a quarterly dividend on its common stock in the amount of $0.22 per share. This dividend will be payable on April 11, 2014 to stockholders of record at the close of business on March 28, 2014.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Accounting Estimates	'
	Accounting Estimates—The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the dates of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting periods. Management believes the estimates used in preparing the 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 records 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, represent securities held within the affiliated funds that the Company consolidates and are measured at fair value based on quoted market prices, market prices obtained from independent pricing services engaged by management or as determined by the Company’s valuation committee. Unrealized gains and losses are recorded as gain (loss) from trading securities—net in the Company’s 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 December 31, 2013, the Company's equity method investments consisted of interests in affiliated 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 gains and losses, net of tax, reported in accumulated other comprehensive income. The Company periodically reviews each individual security position that has an unrealized loss, or impairment, to determine if that impairment is other than temporary. If the Company believes an impairment of a security position is other than temporary, the loss will be recognized in the Company’s consolidated statements of operations. An other than temporary impairment is 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 affiliated funds consolidated by the Company enter into derivative contracts to gain exposure to the underlying commodities markets or to hedge market and credit risks of the underlying portfolios utilizing options, total return swaps, credit default swaps and futures contracts. These instruments are measured at fair value with gains and losses recorded as gain (loss) from trading securities—net in the Company's 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 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 gains and losses recorded in other non-operating income in the Company's 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 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.
Redeemable Noncontrolling Interest	'
	Redeemable Noncontrolling Interest—Redeemable noncontrolling interest represents third-party interests in the Company's consolidated entities. This interest is redeemable at the option of the investors and therefore is not treated as permanent equity. Redeemable noncontrolling interest is remeasured at redemption value which approximates the fair value at each reporting period.
Investment Advisory and Administration Fees	'
	Investment Advisory and Administration Fees—The Company earns revenue by providing asset management services to institutional accounts and to Company-sponsored open-end and closed-end 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 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.
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 consolidated statement of financial condition date. Revenue and expenses are translated at average exchange rates during the period. The gains or losses resulting from translating non-U.S. dollar functional currency into U.S. dollars is included in the Company's consolidated statements of comprehensive income. Gains or losses resulting from non-U.S. dollar currency transactions are included in other non-operating income in the consolidated statements of operations.
Comprehensive Income	'
	Comprehensive Income—The Company reports all changes in comprehensive income in the consolidated statements of comprehensive income. Comprehensive income includes net income or loss attributable to common stockholders, foreign currency translation gain and loss (net of tax), unrealized gain and loss from available-for-sale securities (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 December 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance to provide a single definition of public business entity for use in future financial accounting and reporting guidance. The guidance specifies that an entity that is required by the Securities and Exchange Commission (“SEC”) to file or furnish financial statements with the SEC, or does file or furnish financial statements with the SEC, is considered a public business entity. Additionally, a consolidated subsidiary of a public company is not considered a public business entity for purposes of its standalone financial statements other than those included in an SEC filing by its parent or by other registrants or those that are issuers and are required to file or furnish financial statements with the SEC. This new guidance will be effective for all future accounting updates starting from 2014. The adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.
	In July 2013, the 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 adoption of this new guidance will not have a material impact on the Company's consolidated financial statements.
	In June 2013, the FASB issued new guidance which clarifies the characteristics of an investment company and provides guidance for assessing whether an entity is an investment company. From time to time the Company consolidates certain of its affiliated funds which are considered investment companies. The Company retains the specialized investment company accounting for such funds in consolidation. This new guidance will be effective for the Company’s first quarter of 2014. The adoption of this new guidance will not have a material impact on the Company’s 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 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 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 Measurement (“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 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 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 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.

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets [Abstract]	'
Schedule of Changes in Intangible Assets and Goodwill	'
	The following summarizes the changes in the Company's goodwill and intangible assets during the years ended December 31, 2013 and 2012 (in thousands):
		Goodwill				Finite Lived Intangible				Indefinite Lived
						Assets				Intangible Assets
	Balance at January 1, 2012	$	19,934			$	629			$	1,250
	Currency revaluation	188				—				—
	Amortization during 2012	—				(89		)		—
	Balance at December 31, 2012	$	20,122			$	540			$	1,250
	Currency revaluation	550				—				—
	Amortization during 2013	—				(89		)		—
	Balance at December 31, 2013	$	20,672			$	451			$	1,250
Schedule of Intangible Assets	'
	The following is a summary of the intangible assets at December 31, 2013 and December 31, 2012 (in thousands):
		Remaining		Gross				Accumulated				Intangible
		Amortization		Carrying				Amortization				Assets, Net
		Period		Amount
		(in months)
	2013
	Amortized intangible assets:
	Client relationships	60		$	1,543			$	(1,092	)		$	451
	Non-amortized intangible assets:
	Mutual fund management contracts	—		1,250				—				1,250
	Total			$	2,793			$	(1,092	)		$	1,701
	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
	2014	$	89
	2015	89
	2016	89
	2017	89
	2018	95
	Thereafter	—
	Total	$	451

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments [Abstract]	'
Summary of Investment Holdings	'
	The following is a summary of the Company's investments as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013			December 31, 2012
	Securities owned	$	15,668		$	97,155
	Equity method investments	24,724			8,106
	Investments, available-for-sale	10,449			25,322
Schedule of Variable Interest Entity	'
	The following represents the portion of the consolidated statements of financial condition attributable to the consolidated Onshore Fund as of December 31, 2012 when it was considered a VIE. 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):
		December 31, 2012
	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
Summary of Fair Value of Securities Owned and Equity Method Investments	'
	The following is a summary of the fair value of securities owned and equity method investments as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013						December 31, 2012
		Securities Owned			Equity Method Investments			Securities Owned			Equity Method Investments
	ACOM	$	7,300		$	—		$	—		$	—
	GRP-CIP	2,740			—			2,142			—
	GRP-TE	—			116			—			89
	MLO	5,125			—			—			—
	Offshore Fund	—			412			—			8,017
	Onshore Fund	503			—			26,002			—
	RAP	—			24,196			69,011			—
	Total	$	15,668		$	24,724		$	97,155		$	8,106
Gain (Loss) from Trading Securities	'
	Gain (loss) from trading securities—net for the years ended December 31, 2013, 2012 and 2011, which represent realized and unrealized gains and losses recorded by the funds the Company consolidates, are summarized below (in thousands):
		Years Ended December 31,
		2013			2012			2011
	ACOM	$	(484	)	$	—		$	—
	GLIF	—			142			(145		)
	GRP-CIP	356			55			—
	MLO	155			—			—
	Onshore Fund	495			2,994			184
	RAP	(7,134		)	891			—
	Total (loss) gain from trading securities—net	$	(6,612	)	$	4,082		$	39
Schedule of Equity in Earnings (Losses) of Affiliates	'
	Equity in earnings (losses) of affiliates for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Years Ended December 31,
		2013			2012			2011
	GLIF	$	—		$	—		$	76
	GRP-TE	13			—			—
	Offshore Fund	149			1,050			(878		)
	Onshore Fund	—			—			(2,219		)
	RAP	678			—			—
	Total equity in earnings (losses) of affiliates	$	840		$	1,050		$	(3,021	)
Schedule of Available-for-Sale Securities Reconciliation	'
	The following is a summary of the cost, gross unrealized gains, gross unrealized losses and fair value of investments, available-for-sale as of December 31, 2013 and December 31, 2012 (in thousands):
		December 31, 2013
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
					Gains			Losses <
								12 months
	Preferred securities	$	4,142		$	183		$	(40	)	$	4,285
	Common stocks	5,400			698			(132		)	5,966
	Company-sponsored mutual funds	197			1			—			198
	Total investments, available-for-sale	$	9,739		$	882		$	(172	)	$	10,449
		December 31, 2012
		Cost			Gross			Gross			Fair
					Unrealized			Unrealized			Value
					Gains			Losses <
								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
Schedule of Realized Gain (Loss) on Investments, available-for-sale	'
	Sales proceeds, gross realized gains and losses from investments, available-for-sale for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Years Ended December 31,
		2013			2012			2011
	Proceeds from sales	$	26,541		$	25,736		$	28,703
	Gross realized gains	2,743			1,918			1,509
	Gross realized losses	(484		)	(681		)	(1,133		)

Fair_Value_Tables

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value [Abstract]	'
Fair Value Measurements, Recurring and Nonrecurring	'
	The following table presents fair value measurements as of December 31, 2012 (in thousands):
		Level 1				Level 2				Level 3				Total
	Cash equivalents (1)	$	20,204			$	—			$	—			$	20,204
	Due from broker (1)	$	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	$	14,685			$	—			$	—			$	14,685
	_________________________
	(1) Comprised of investments in money market funds.
	Transfers among levels, if any, are recorded at the beginning of the reporting period.
	The following table presents fair value measurements as of December 31, 2013 (in thousands):
		Level 1				Level 2				Level 3				Total
	Cash equivalents (1)	$	61,551			$	—			$	—			$	61,551
	Securities owned
	Common stocks	$	5,125			$	—			$	503			$	5,628
	Fixed income securities	—				7,300				—				7,300
	Limited partnership interests	—				—				2,740				2,740
	Total securities owned	$	5,125			$	7,300			$	3,243			$	15,668
	Equity method investments	$	24,196			$	—			$	528			$	24,724
	Investments, available-for-sale
	Preferred securities	$	960			$	—			$	3,325			$	4,285
	Common stocks	5,966				—				—				5,966
	Company-sponsored mutual funds	198				—				—				198
	Total investments, available-for-sale	$	7,124			$	—			$	3,325			$	10,449
	Derivatives - assets
	Foreign exchange contracts	$	—			$	398			$	—			$	398
	Commodity contracts	305				—				—				305
	Total derivatives - assets	$	305			$	398			$	—			$	703
	Derivatives - liabilities
	Commodity contracts	$	275			$	—			$	—			$	275
	Total derivatives - liabilities	$	275			$	—			$	—			$	275
	_________________________
	(1) Comprised of investments in money market funds.
Fair Value, Valuation Technique, Unobservable Inputs	'
	The following table summarizes the changes in level 3 investments measured at fair value on a recurring basis for the years ended December 31, 2013 and 2012 (in thousands):
		Securities									Equity Method Investments					Investments, available-for-sale
		Owned
		Common Stocks					Limited Partnership Interests				GRP-TE/Offshore Fund					Preferred Securities
	Balance at January 1, 2012	$	1,275				$	—			$	—				$	4,150
	Purchases / contributions	628					2,080				89					125
	Sales / distributions	—					—				—					(1,213		)
	Realized gains	—					—				—					100
	Unrealized (losses) gains (4)	(107		)			62				—					6
	Transfers out of level 3	(628		)	(2	)	—				—					(88		)	(3	)
	Balance at December 31, 2012	$	1,168				$	2,142			$	89				$	3,080
	Purchases / contributions	—					393				15					—
	Sales / distributions	(419		)			(151		)		(7,066		)			—
	Realized gains (losses)	(211		)			11				—					—
	Unrealized gains (losses) (4)	(35		)			345				54					245
	Transfers into level 3	—					—				7,436			(1	)	—
	Balance at December 31, 2013	$	503				$	2,740			$	528				$	3,325
	_________________________
	(1) Transferred from level 2 to level 3 during the year ended December 31, 2013 due to the imposition of redemption restrictions on the Company's investment in connection with the winding down of the operations of the Offshore Fund.
	(2) Transferred from level 3 to level 2 because observable market data became available for the securities during the year ended December 31, 2012.
	(3) Transferred from level 3 to level 1 because securities started trading actively on an exchange during the year ended December 31, 2012.
	(4) Pertains to unrealized gains (losses) from securities held at December 31, 2013 and 2012, respectively.
	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		Input /
		(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 cost		Recent transaction price
	The valuation techniques and significant unobservable inputs used in the fair value measurement of the following level 3 investments as of December 31, 2013 were (in thousands):
		Fair Value				Fair Value		Significant		Input /
		(in thousands)				Methodology		Unobservable Inputs		Range
	Common shares of privately-held company	$	503			Market comparable companies		Price / tangible book ratio		1.48x
								Liquidity discount		33.36%
	Limited partnership interests - direct investments in real estate	$	2,101			Discounted cash flows		Discount rate		9% - 15%
								Exit capitalization rates		8.5% - 9%
								Market rental rates		$15.00 - 16.25 psf

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2013
Derivatives [Abstract]	'
Schedule of Derivative Instruments	'
		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 December 31, 2013 and December 31, 2012 (in thousands):
		31-Dec-13
		Assets						Liabilities
		Notional			Fair Value			Notional			Fair Value
	Total foreign exchange contracts	$	10,853		$	398		$	—		$	—
	Total commodity contracts	8,115			305			5,738			275
	Total derivatives	$	18,968		$	703		$	5,738		$	275
Gain (loss) on Derivatives	'
	Gains and losses from derivative financial instruments for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Year Ended December 31,
		2013			2012			2011
	Equity contracts	$	(584	)	$	125		$	(77	)
	Foreign exchange contracts	(218		)	686			—
	Commodity contracts	(3,689		)	(517		)	—
	Credit contracts	(21		)	(38		)	(14		)
	Total derivatives	$	(4,512	)	$	256		$	(91	)

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	The following is a summary of property and equipment at December 31, 2013 and 2012 (in thousands):
		At December 31,
		2013			2012
	Equipment	$	8,606		$	5,539
	Furniture and fixtures	3,487			3,465
	Software	13,405			10,366
	Leasehold improvements	11,374			11,346
	Subtotal	36,872			30,716
	Less: Accumulated depreciation and amortization	(27,048		)	(21,613		)
	Property and equipment, net	$	9,824		$	9,103

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 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 years ended December 31, 2013, 2012 and 2011 (in thousands, except per share data):
		Years Ended December 31,
		2013		2012			2011
	Net income	$	63,255	$	67,896		$	54,277
	Less: Net loss (income) attributable to redeemable noncontrolling interest	4,864		(1,779		)	30
	Net income attributable to common stockholders	$	68,119	$	66,117		$	54,307
	Basic weighted average shares outstanding	44,272		43,766			43,190
	Dilutive potential shares from restricted stock units	811		716			785
	Diluted weighted average shares outstanding	45,083		44,482			43,975
	Basic earnings per share attributable to common stockholders	$	1.54	$	1.51		$	1.26
	Diluted earnings per share attributable to common stockholders	$	1.51	$	1.49		$	1.23

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award	'
	The following table sets forth activity relating to the Company's incentive bonus plans, including Company match and dividend equivalents (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	770		$	24.17
	Granted	740		28.59
	Delivered	(362	)	27.79
	Forfeited	(16	)	25.46
	Balance at December 31, 2011	1,132		25.88
	Granted	692		33.38
	Delivered	(464	)	24.72
	Forfeited	(46	)	30.88
	Balance at December 31, 2012	1,314		30.07
	Granted	587		33.55
	Delivered	(400	)	27.79
	Forfeited	(70	)	32.13
	Balance at December 31, 2013	1,431		32.03
	The following table sets forth activity relating to the Company's granted awards under the above mentioned plans (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	1,432		$	21.07
	Granted	253		28.98
	Delivered	(369	)	22.47
	Forfeited	(37	)	21.98
	Balance at December 31, 2011	1,279		22.21
	Granted	100		32.34
	Delivered	(346	)	23.57
	Forfeited	(54	)	20.75
	Balance at December 31, 2012	979		22.85
	Granted	305		34.2
	Delivered	(307	)	21.95
	Forfeited	(27	)	25.28
	Balance at December 31, 2013	950		26.72
	The following table sets forth activity relating to the Company's granted awards of vested RSUs under the SIP for awards to the independent directors (share data in thousands):
		Number of Shares		Weighted Average
				Grant Date Fair Value
	Balance at January 1, 2011	46		$	19.66
	Granted	10		29.12
	Delivered	(11	)	27.63
	Balance at December 31, 2011	45		19.9
	Granted	10		31.77
	Delivered	(21	)	13.79
	Balance at December 31, 2012	34		27.46
	Granted	9		33.83
	Delivered	(14	)	22.79
	Balance at December 31, 2013	29		31.47

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 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 years ended December 31, 2013, 2012 and 2011 (in thousands):
		Years Ended December 31,
		2013		2012		2011
	Investment advisory and administration fees	$	190,058	$	155,931	$	132,320
	Distribution and service fees	14,359		11,334		9,718
		$	204,417	$	167,265	$	142,038
	Sales proceeds, gross realized gains and dividend income from investments, available-for-sale in Company-sponsored mutual funds for the years ended December 31, 2013, 2012 and 2011 are summarized below (in thousands):
		Years Ended December 31,
		2013		2012		2011
	Proceeds from sales	$	10,715	$	103	$	3,333
	Gross realized gains	615		4		317
	Dividend income	9		3		36

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases	'
	The Company subleases some of its office space to a third party under a noncancelable operating lease expiring January 30, 2014. The aggregate minimum future payments under the leases and subleases are as follows (in thousands):
	Years Ended December 31,	Gross Rent Obligations		Sublease Income			Net Rent Obligations
	2014	$	7,914	$	(75	)	$	7,839
	2015	9,004		—			9,004
	2016	8,754		—			8,754
	2017	8,447		—			8,447
	2018	8,447		—			8,447
	Thereafter	47,320		—			47,320
		$	89,886	$	(75	)	$	89,811

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Income before Taxes	'
	The income before provision for income taxes and provision for income taxes for the years ended December 31, 2013, 2012 and 2011 are as follows (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Income before provision for income taxes - U.S.	$	89,963			$	89,828			$	65,739
	Income before provision for income taxes - Non-U.S.	14,401				14,475				21,122
	Total income before provision for income taxes	$	104,364			$	104,303			$	86,861
	Current taxes:
	U.S. federal	$	36,490			$	29,723			$	24,685
	State and local	5,025				3,754				3,357
	Non-U.S.	2,681				3,103				4,957
		44,196				36,580				32,999
	Deferred taxes:
	U.S. federal	(2,754		)		(92		)		(320		)
	State and local	(379		)		(12		)		(43		)
	Non-U.S.	46				(69		)		(52		)
		(3,087		)		(173		)		(415		)
	Provision for income taxes	$	41,109			$	36,407			$	32,584
Components of Deferred Tax Assets and Liabilities	'
	Significant components of the Company's net deferred income tax asset at December 31, 2013 and 2012 consist of the following (in thousands):
		At December 31,
		2013				2012
	Deferred income tax assets (liabilities):
	Stock-based compensation	$	7,953			$	6,376
	Non-deductible realized loss on sales of securities	6,706				7,109
	Dividend equivalents on unvested restricted stock units	4,504				3,618
	Unrealized gains on investments	(1,296		)		(1,596		)
	Other	1,687				177
	Subtotal	19,554				15,684
	Less: valuation allowance	(5,410		)		(5,513		)
	Deferred income tax asset - net	$	14,144			$	10,171
Reconciliation of Gross Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands):
		Liability for Unrecognized Tax Benefits
	Gross unrecognized tax benefits balance at January 1, 2011	$	4,729
	Addition for tax positions of current year	832
	Addition for tax positions of prior years	52
	Reduction of tax positions from prior years	(901		)
	Gross unrecognized tax benefits balance at December 31, 2011	$	4,712
	Addition for tax positions of current year	933
	Addition for tax positions of prior years	74
	Reduction of tax positions from prior years	(820		)
	Gross unrecognized tax benefits balance at December 31, 2012	$	4,899
	Addition for tax positions of current year	1,421
	Addition for tax positions of prior years	1,597
	Reduction of tax positions from prior years	(1,990		)
	Gross unrecognized tax benefits balance at December 31, 2013	$	5,927
Reconciliation of Federal Statutory Income Tax Rate to Effective Rate	'
	A reconciliation of the Company's statutory federal income tax rate and the effective tax rate for the years ended December 31, 2013, 2012 and 2011 is as follows:
		Years Ended December 31,
		2013			2012			2011
	U.S. statutory tax rate	35	%		35	%		35	%
	State and local income taxes, net of federal income taxes	4.8	%		4.4	%		4.8	%
	Non-deductibility of loss on securities	—	%		—	%		1.6	%
	Reserve adjustments	0.6	%		(0.1	)%		(0.2	)%
	Non-taxable gains on securities	(0.3	)%		(1.2	)%		—	%
	Foreign operations tax differential	(2.5	)%		(2.4	)%		(4.0	)%
	Other	—	%		(0.2	)%		0.3	%
	Effective income tax rate	37.6	%		35.5	%		37.5	%

Concentration_of_Credit_Risk_T

Concentration of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Schedules of Concentration of Risk, by Risk Factor	'
	The table below presents revenue by client domicile for the years ended December 31, 2013, 2012 and 2011 (in thousands):
		Years Ended December 31,
		2013			2012			2011
	United States	$	238,591		$	204,872		$	177,002
	Non - U.S.
	Japan	42,603			53,356			42,735
	Other	16,519			15,325			17,509
	Total	$	297,713		$	273,553		$	237,246
	The following affiliated fund and third party institutional separate account relationship provided 10 percent or more of the total revenue of the Company (in thousands):
		Years Ended December 31,
		2013			2012			2011
	Cohen & Steers Realty Shares, Inc. (CSR):
	Investment advisory and administration fees	$	42,618		$	36,853		$	29,731
	Percent of total revenue	14		%	13		%	13		%
	One Institutional Separate Account Relationship:
	Investment advisory and administration fees	$	36,704		$	40,904		$	41,538
	Portfolio consulting and other	5,510			12,000			907
	Total	$	42,214		$	52,904		$	42,445
	Percent of total revenue	14		%	19		%	18		%

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
	The data presented should be read in conjunction with the consolidated financial statements of Cohen & Steers, Inc. and “Management's Discussion and Analysis of Financial Condition and Results of Operations” included herein (in thousands, except per share data):
		Quarter
		1st		2nd		3rd		4th		Total
	2013
	Revenue	$	72,459	$	77,796	$	74,026	$	73,432	$	297,713
	Operating income	20,710		28,557		27,719		29,356		106,342
	Net income attributable to common stockholders	15,141		15,282		18,283		19,413		68,119
	Earnings per share attributable to common stockholders:
	Basic	0.34		0.34		0.41		0.44		1.54
	Diluted	0.34		0.34		0.41		0.43		1.51
	Weighted-average shares outstanding:
	Basic	44,137		44,306		44,317		44,325		44,272
	Diluted	44,882		45,002		45,106		45,338		45,083
	2012
	Revenue	$	63,730	$	67,432	$	71,296	$	71,095	$	273,553
	Operating income	25,396		26,064		12,239		32,733		96,432
	Net income attributable to common stockholders	18,054		16,079		10,261		21,723		66,117
	Earnings per share attributable to common stockholders:
	Basic	0.41		0.37		0.23		0.5		1.51
	Diluted	0.41		0.36		0.23		0.49		1.49
	Weighted-average shares outstanding:
	Basic	43,601		43,808		43,822		43,832		43,766
	Diluted	44,386		44,393		44,537		44,609		44,482

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Distribution and service fees - Non-GAAP	'	'
Closed-end mutual funds	2	'
Distribution rights	'	'
Distribution and service fees - Non-GAAP	'	'
Distribution and service fees	$7.20	$14.40
Minimum	'	'
Schedule of Equity Method Investments	'	'
Ownership range	20.00%	'
Maximum	'	'
Schedule of Equity Method Investments	'	'
Ownership range	50.00%	'

Summary_of_Significant_Account3

Summary of Significant Accounting Policies Cumulative Translation Adjustments balance (Details) (Accumulated Translation Adjustment [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accumulated Translation Adjustment [Member]	'	'	'
Cumulative Translation Adjustments balance [Line Items]	'	'	'
Cumulative Foreign Currency Translation Adjustment, Net of Tax	$2,264	$985	$234

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill	'	'	'
Beginning balance	$20,122	$19,934	'
Currency revaluation	550	188	'
Ending balance	20,672	20,122	19,934
Finite Lived Intangible Assets	'	'	'
Finite lived intangible assets, gross	'	'	629
Amortization	-89	-89	-89
Finite lived intangible assets, net	451	540	'
Indefinite Lived Intangible Assets	'	'	'
Indefinite Lived Intangible Assets	$1,250	$1,250	$1,250

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets by Major Class	'	'	'
Mutual fund management contracts	$1,250	$1,250	$1,250
Client relationships, gross carrying amount	'	'	629
Total	2,793	2,793	'
Accumulated amortization	-1,092	-1,003	'
Finite lived intangible assets total	451	540	'
Intangible assets total	1,701	1,790	'
Remaining amortization period	'60 months	'72 months	'
Amortization	89	89	89
Customer Relationships [Member]	'	'	'
Intangible Assets by Major Class	'	'	'
Client relationships, gross carrying amount	1,543	1,543	'
Accumulated amortization	-1,092	-1,003	'
Finite lived intangible assets total	451	540	'
Fund Management Contracts Member [Member]	'	'	'
Intangible Assets by Major Class	'	'	'
Mutual fund management contracts	$1,250	$1,250	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Fiscal Year Maturity (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite Lived Intangible Assets, Future Amortization Expense	'	'
2014	$89	'
2015	89	'
2016	89	'
2017	89	'
2018	95	'
Thereafter	0	'
Finite lived intangible assets total	$451	$540

Investments_Trading_Equity_Met

Investments - Trading, Equity Method Investments and Investments, Available for Sale (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2012

Preferred securities

Preferred securities

Common stock

Common stock

Company-sponsored mutual funds

Company-sponsored mutual funds

ACOM

ACOM

ACOM

GLIF

GLIF

GLIF

GRP-CIP

GRP-CIP

GRP-CIP

GRP-TE

GRP-TE

GRP-TE

Offshore Fund

Offshore Fund

Offshore Fund

Onshore Fund

Onshore Fund

Onshore Fund

RAP

RAP

RAP

MLO

MLO

MLO

MLO

Onshore Fund

Schedule of Trading Securities and Other Trading Assets [Line Items]

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale securities in an unrealized loss position

$1,785

$5,630

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities owned

15,668

[1],[2]

97,155

[1],[2]

'

'

'

'

'

'

'

7,300

0

'

'

'

'

2,740

2,142

'

0

0

'

0

0

'

503

26,002

'

0

69,011

'

'

5,125

'

0

26,002

Due from broker

2,906

[1]

17,617

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,358

Other assets

5,673

[1]

8,120

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

103

Total assets

274,926

337,315

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

38,463

Liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities sold but not yet purchased

0

[1]

14,685

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14,685

Other liabilities

18,373

[1]

18,181

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

335

Total liabilities

51,162

67,547

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,020

Securities Owned and Equity Method Investments [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities owned

15,668

[1],[2]

97,155

[1],[2]

'

'

'

'

'

'

'

7,300

0

'

'

'

'

2,740

2,142

'

0

0

'

0

0

'

503

26,002

'

0

69,011

'

'

5,125

'

0

26,002

Equity method investments

24,724

8,106

'

'

'

'

'

'

'

0

0

'

'

'

'

0

0

'

116

89

'

412

8,017

'

0

0

'

24,196

0

'

'

'

'

'

'

Trading Securities, Realized Gain (Loss) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain (loss) from trading securities - net

-6,612

4,082

39

'

'

'

'

'

'

-484

0

0

0

142

-145

356

55

0

'

'

'

'

'

'

495

2,994

184

-7,134

891

0

0

155

0

'

'

Equity in Earnings (Losses) of Affiliates [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity in Earnings (Losses) of Affiliates

840

1,050

-3,021

'

'

'

'

'

'

'

'

'

0

0

76

'

'

'

13

0

0

149

1,050

-878

0

0

-2,219

678

0

0

'

'

'

'

'

Available-for-sale securities [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cost

9,739

23,941

'

4,142

4,351

5,400

9,490

197

10,100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross Unrealized Gain

882

1,712

'

183

70

698

1,147

1

495

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross Unrealized Loss less than 12 months

-172

-331

'

-40

-82

-132

-249

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value

10,449

25,322

'

4,285

4,339

5,966

10,388

198

10,595

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from investing activities [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from sales

26,541

25,736

28,703

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross realized gain

2,743

1,918

1,509

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross realized loss

($484)

($681)

($1,133)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

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

[2]

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

Fair_Value_Details

Fair Value (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	15,668	[1],[2]	97,155	[1],[2]
Equity method investments	24,724		8,106
Investments, available-for-sale	10,449		25,322
Securities sold but not yet purchased	0	[1]	14,685	[1]
Level 3 [Member] | Minimum	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Level 3 Ratio Ranges	1.48		1.02
Fair Value Inputs, Discount for Lack of Marketability	33.36%		'
Fair Value Inputs, Discount Rate	0.00%		'
Fair Value Inputs, Exit Capitalization	8.50%		'
Fair Value Inputs, Price Per Square Foot	15		'
Level 3 [Member] | Maximum	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Level 3 Ratio Ranges	'		1.1
Fair Value Inputs, Discount Rate	15.00%		'
Fair Value Inputs, Exit Capitalization	9.00%		'
Fair Value Inputs, Price Per Square Foot	16.25		'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Cash equivalents	61,551	[3]	20,204	[3]
Due from broker	'		3,950	[3]
Securities owned	5,125		52,772
Equity method investments	24,196		0
Investments, available-for-sale	7,124		22,237
Derivative - assets	305		387
Derivative - liabilities	275		496
Securities sold but not yet purchased	'		14,685
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	'		51
Derivative - liabilities	'		4
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign exchange contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	0		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commodity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	305		336
Derivative - liabilities	275		492
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Credit contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - liabilities	'		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Cash equivalents	0	[3]	0	[3]
Due from broker	'		0	[3]
Securities owned	7,300		41,073
Equity method investments	0		8,017
Investments, available-for-sale	0		5
Derivative - assets	398		668
Derivative - liabilities	0		131
Securities sold but not yet purchased	'		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	'		52
Derivative - liabilities	'		111
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign exchange contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	398		616
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commodity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	0		0
Derivative - liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Credit contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - liabilities	'		20
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Cash equivalents	0	[3]	0	[3]
Due from broker	'		0	[3]
Securities owned	3,243		3,310
Equity method investments	528		89
Investments, available-for-sale	3,325		3,080
Derivative - assets	0		0
Derivative - liabilities	0		0
Securities sold but not yet purchased	'		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	'		0
Derivative - liabilities	'		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign exchange contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commodity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	0		0
Derivative - liabilities	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Credit contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - liabilities	'		0
Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Cash equivalents	61,551	[3]	20,204	[3]
Due from broker	'		3,950	[3]
Securities owned	15,668		97,155
Equity method investments	24,724		8,106
Investments, available-for-sale	10,449		25,322
Derivative - assets	703		1,055
Derivative - liabilities	275		627
Securities sold but not yet purchased	'		14,685
Fair Value, Measurements, Recurring [Member] | Total [Member] | Equity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	'		103
Derivative - liabilities	'		115
Fair Value, Measurements, Recurring [Member] | Total [Member] | Foreign exchange contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	398		616
Fair Value, Measurements, Recurring [Member] | Total [Member] | Commodity contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - assets	305		336
Derivative - liabilities	275		492
Fair Value, Measurements, Recurring [Member] | Total [Member] | Credit contracts	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Derivative - liabilities	'		20
Preferred securities	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	4,285		4,339
Preferred securities | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	'		1,418
Investments, available-for-sale	960		1,254
Preferred securities | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	'		1,505
Investments, available-for-sale	0		5
Preferred securities | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	'		0
Investments, available-for-sale	3,325		3,080
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	3,080		4,150
Purchases / contributions	0		125
Sales / distributions	0		-1,213
Realized gain (loss)	0		100
Unrealized gain (loss)	245	[4]	6	[4]
Transfers into (out) of level 3	0		-88	[5]
Ending Balance	3,325		3,080
Preferred securities | Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	'		2,923
Investments, available-for-sale	4,285		4,339
Common stock	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	5,966		10,388
Common stock | Level 3 [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Level 3 Fair Value	503		1,168
Common stock | Fair Value, Measurements, Recurring [Member]	'		'
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
Common stock | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	5,125		51,354
Investments, available-for-sale	5,966		10,388
Common stock | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		'
Investments, available-for-sale	0		0
Common stock | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	503		1,168
Investments, available-for-sale	0		0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	1,168		1,275
Purchases / contributions	0		628
Sales / distributions	-419		0
Realized gain (loss)	-211		0
Unrealized gain (loss)	-35	[4]	-107	[4]
Transfers into (out) of level 3	0		-628	[6]
Ending Balance	503		1,168
Common stock | Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	5,628		69,266
Investments, available-for-sale	5,966		10,388
Fixed income [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		0
Fixed income [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	7,300		22,824
Fixed income [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		0
Fixed income [Member] | Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	7,300		22,824
Limited partnership interest [Member] | Level 3 [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Level 3 Fair Value	2,101		2,142
Limited partnership interest [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		0
Limited partnership interest [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		0
Limited partnership interest [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	2,740		2,142
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	2,142		0
Purchases / contributions	393		2,080
Sales / distributions	-151		0
Realized gain (loss)	11		0
Unrealized gain (loss)	345	[4]	62	[4]
Transfers into (out) of level 3	0		0
Ending Balance	2,740		2,142
Limited partnership interest [Member] | Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	2,740		2,142
Company-sponsored mutual funds	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	198		10,595
Company-sponsored mutual funds | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	198		10,595
Company-sponsored mutual funds | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	0		0
Company-sponsored mutual funds | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	0		0
Company-sponsored mutual funds | Fair Value, Measurements, Recurring [Member] | Total [Member]	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Investments, available-for-sale	198		10,595
GRP-TE	'		'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]	'		'
Securities owned	0		0
Equity method investments	116		89
GRP-TE | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'
Beginning Balance	89		0
Purchases / contributions	15		89
Sales / distributions	-7,066		0
Realized gain (loss)	0		0
Unrealized gain (loss)	54	[4]	0	[4]
Transfers into (out) of level 3	7,436	[7]	0
Ending Balance	528		89
[1]	Asset and liability amounts in parentheses represent the consolidated balances at December 31, 2012 attributable to Cohen & Steers Global Real Estate Long-Short Fund, L.P., which was a variable interest entity as of December 31, 2012.
[2]	Pledged as collateral attributable to the consolidated balances of Cohen & Steers Active Commodities Fund, LP as of December 31, 2013 and Cohen & Steers Real Assets Fund, Inc. as of December 31, 2012.
[3]	Comprised of investments in money market funds.
[4]	Pertains to unrealized gains (losses) from securities held at December 31, 2013 and 2012, respectively.
[5]	Transferred from level 3 to level 1 because securities started trading actively on an exchange during the year ended December 31, 2012.
[6]	Transferred from level 3 to level 2 because observable market data became available for the securities during the year ended December 31, 2012.
[7]	Transferred from level 2 to level 3 during the year ended December 31, 2013 due to the imposition of redemption restrictions on the Company's investment in connection with the winding down of the operations of the Offshore Fund.

Derivatives_Details

Derivatives (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]	'	'	'
Derivative, Gain (Loss) on Derivative, Net	($4,512)	$256	($91)
Derivative Assets, Notional Amount	18,968	41,009	'
Derivative Assets, Fair Value	703	1,055	'
Derivative Liabilities, Notional Amount	5,738	17,396	'
Derivative Liabilities, Fair Value	275	627	'
Securities Owned	'	'	'
Derivative [Line Items]	'	'	'
Securities owned and held as collateral	7,300	849	'
Due From Broker [Member]	'	'	'
Derivative [Line Items]	'	'	'
Cash Collateral for Borrowed Securities	2,110	2,161	'
Equity contracts	'	'	'
Derivative [Line Items]	'	'	'
Derivative, Gain (Loss) on Derivative, Net	-584	125	-77
Derivative Assets, Notional Amount	'	9,608	'
Derivative Assets, Fair Value	'	103	'
Derivative Liabilities, Notional Amount	'	4,942	'
Derivative Liabilities, Fair Value	'	115	'
Foreign exchange contracts	'	'	'
Derivative [Line Items]	'	'	'
Derivative, Gain (Loss) on Derivative, Net	-218	686	0
Derivative Assets, Notional Amount	10,853	13,584	'
Derivative Assets, Fair Value	398	616	'
Derivative Liabilities, Notional Amount	0	0	'
Derivative Liabilities, Fair Value	0	0	'
Commodity contracts	'	'	'
Derivative [Line Items]	'	'	'
Derivative, Gain (Loss) on Derivative, Net	-3,689	-517	0
Derivative Assets, Notional Amount	8,115	17,817	'
Derivative Assets, Fair Value	305	336	'
Derivative Liabilities, Notional Amount	5,738	10,954	'
Derivative Liabilities, Fair Value	275	492	'
Credit contracts	'	'	'
Derivative [Line Items]	'	'	'
Derivative, Gain (Loss) on Derivative, Net	-21	-38	-14
Derivative Assets, Notional Amount	'	0	'
Derivative Assets, Fair Value	'	0	'
Derivative Liabilities, Notional Amount	'	1,500	'
Derivative Liabilities, Fair Value	'	$20	'

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property and Equipment [Line Items]	'	'	'
Depreciation and amortization	$5,517	$5,473	$4,967
Property and equipment, gross	36,872	30,716	'
Accumulated depreciation and amortization	-27,048	-21,613	'
Property and equipment, net	9,824	9,103	'
Minimum	'	'	'
Property and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Useful Life	'3 years	'	'
Maximum	'	'	'
Property and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Useful Life	'7 years	'	'
Equipment [Member]	'	'	'
Property and Equipment [Line Items]	'	'	'
Property and equipment, gross	8,606	5,539	'
Furniture and Fixtures [Member]	'	'	'
Property and Equipment [Line Items]	'	'	'
Property and equipment, gross	3,487	3,465	'
Software [Member]	'	'	'
Property and Equipment [Line Items]	'	'	'
Property and equipment, gross	13,405	10,366	'
Leasehold Improvements [Member]	'	'	'
Property and Equipment [Line Items]	'	'	'
Property and equipment, gross	$11,374	$11,346	'

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Anti-dilutive common stock equivalents excluded from computation (in shares)	'	'	'	'	'	'	'	'	0	'	2,000
Net income	'	'	'	'	'	'	'	'	$63,255	$67,896	$54,277
Less: Net loss (income) attributable to redeemable noncontrolling interest	'	'	'	'	'	'	'	'	4,864	-1,779	30
Net income attributable to common shareholders	$19,413	$18,283	$15,282	$15,141	$21,723	$10,261	$16,079	$18,054	$68,119	$66,117	$54,307
Basic weighted average shares outstanding (in shares)	44,325,000	44,317,000	44,306,000	44,137,000	43,832,000	43,822,000	43,808,000	43,601,000	44,272,000	43,766,000	43,190,000
Dilutive potential shares from restricted stock units (in shares)	'	'	'	'	'	'	'	'	811,000	716,000	785,000
Diluted weighted average shares outstanding (in shares)	45,338,000	45,106,000	45,002,000	44,882,000	44,609,000	44,537,000	44,393,000	44,386,000	45,083,000	44,482,000	43,975,000
Basic earnings per share attributable to common shareholders (in dollars per share)	$0.44	$0.41	$0.34	$0.34	$0.50	$0.23	$0.37	$0.41	$1.54	$1.51	$1.26
Diluted earnings per share attributable to common shareholders (in dollars per share)	$0.43	$0.41	$0.34	$0.34	$0.49	$0.23	$0.36	$0.41	$1.51	$1.49	$1.23

StockBased_Compensation_Vested

Stock-Based Compensation - Vested RSUs (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	'10 years	'	'
Common stock, shares issued	47,735,793	47,002,117	'
Stock Incentive Plan [Member] | Common stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Shares Authorized	16,000,000	'	'
Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Common stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Common stock, shares issued	12,100,000	'	'
Allocated Share-based Compensation Expense	$8,491	$7,328	$8,224
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number of Shares [Roll Forward] [Roll Forward]	'	'	'
Balance at Beginning of Period (shares)	34,000	45,000	46,000
Granted (shares)	9,000	10,000	10,000
Delivered (shares)	-14,000	-21,000	-11,000
Balance at End of Period (shares)	29,000	34,000	45,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Weighted Average Grant Date Fair Value [Abstract] [Abstract]	'	'	'
Balance at beginning of period, Weighted Average Grant Date Fair Value (usd per share)	$27.46	$19.90	$19.66
Granted, Weighted Average Grant Date Fair Value (usd per share)	$33.83	$31.77	$29.12
Delivered, Weighted Average Grant Date Fair Value (usd per share)	$22.79	$13.79	$27.63
Balance at end of period, Weighted Average Grant Date Fair Value (usd per share)	$31.47	$27.46	$19.90
Stock Incentive Plan [Member] | Vested Restricted Stock Units (RSUs) [Member] | Common stock	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Allocated Share-based Compensation Expense	$300	$326	$300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number of Shares [Roll Forward] [Roll Forward]	'	'	'
Balance at End of Period (shares)	29,000	'	'

StockBased_Compensation_Unvest

Stock-Based Compensation - Unvested RSUs and Incentive Bonus Plans (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Number of Plans	2	'	'
Common stock, shares issued	47,735,793	47,002,117	'
Share-based Compensation Arrangement by Share-based Payment Award, Incentive Bonus Plans, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]	'	'	'
Employee stock purchase plans	13,000	16,000	18,000
Unearned compensation	$39,742	'	'
Vesting period of unvested employee stock compensation, number of years	'3 years	'	'
Common stock | Incentive Bonus Plans for Employees [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Incentive Bonus Plans, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Annual Aggregate Purchases Per Employee	25	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee	600,000	'	'
Restricted Stock Units (RSUs) [Member] | Common stock | Stock Incentive Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]	'	'	'
Balance at beginning of period (shares)	979,000	1,279,000	1,432,000
Granted (shares)	305,000	100,000	253,000
Delivered (shares)	-307,000	-346,000	-369,000
Forfeited (shares)	-27,000	-54,000	-37,000
Balance at end of period (shares)	950,000	979,000	1,279,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Balance at beginning of period, Weighted Average Grant Date Fair Value (usd per share)	$22.85	22.21	21.07
Granted, Weighted Average Grant Date Fair Value (usd per share)	$34.20	32.34	28.98
Delivered, Weighted Average Grant Date Fair Value (usd per share)	$21.95	23.57	22.47
Forfeited, Weighted Average Grant Date Fair Value (usd per share)	$25.28	20.75	21.98
Balance at end of period, Weighted Average Grant Date Fair Value (usd per share)	$26.72	22.85	22.21
Common stock, shares issued	12,100,000	'	'
Allocated Share-based Compensation Expense	8,491	7,328	8,224
Share-based Compensation Arrangement by Share-based Payment Award, Incentive Bonus Plans, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]	'	'	'
Delivered, Weighted Average Grant Date Fair Value (usd per share)	$21.95	23.57	22.47
Restricted Stock Units (RSUs) [Member] | Common stock | Incentive Bonus Plans for Employees [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Delivered, Weighted Average Grant Date Fair Value (usd per share)	$27.79	24.72	27.79
Share-based Compensation Arrangement by Share-based Payment Award, Incentive Bonus Plans [Roll Forward]	'	'	'
Balance at beginning of period (shares)	1,314,000	1,132,000	770,000
Granted (shares)	587,000	692,000	740,000
Delivered (shares)	400,000	464,000	-362,000
Forfeited (shares)	-70,000	-46,000	-16,000
Balance at end of period (shares)	1,431,000	1,314,000	1,132,000
Share-based Compensation Arrangement by Share-based Payment Award, Incentive Bonus Plans, Weighted Average Grant Date Fair Value [Roll Forward] [Roll Forward]	'	'	'
Balance at beginning of period, Weighted Average Grant Date Fair Value (usd per share)	$30.07	25.88	24.17
Granted, Weighted Average Grant Date Fair Value (usd per share)	$33.55	33.38	28.59
Delivered, Weighted Average Grant Date Fair Value (usd per share)	$27.79	24.72	27.79
Forfeited, Weighted Average Grant Date Fair Value (usd per share)	$32.13	30.88	25.46
Balance at end of period, Weighted Average Grant Date Fair Value (usd per share)	$32.03	30.07	25.88
Discount from market price, purchase date	15.00%	'	'
Restricted Stock Units (RSUs) [Member] | Common stock | Mandatory Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Common stock, shares issued	1,371,000	'	'
Allocated Share-based Compensation Expense	12,863	10,069	10,300
Restricted Stock Units (RSUs) [Member] | Common stock | Voluntary Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Common stock, shares issued	60,000	'	'
Restricted Stock Units (RSUs) [Member] | Common stock | Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Allocated Share-based Compensation Expense	72	76	81
Vested Restricted Stock Units (RSUs) [Member] | Common stock | Stock Incentive Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Allocated Share-based Compensation Expense	300	326	300
Vested Restricted Stock Units (RSUs) [Member] | Common stock | Voluntary Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]	'	'	'
Allocated Share-based Compensation Expense	$113	577	602

401k_and_ProfitSharing_Plan_De

401(k) and Profit-Sharing Plan (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Maximum	'	'	'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%	'	'
Defined Contribution Pension [Member]	'	'	'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'
Forfeitures during period	$176	$72	$52
Employer matching contributions	$1,462	$1,110	$1,088
Defined Contribution Pension [Member] | Maximum	'	'	'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate	100.00%	'	'

Related_Party_Transactions_Det

Related Party Transactions (Details) (Affiliated Entity, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions Revenue [Abstract]	'	'	'
Investment advisory and administrative fees	$190,058	$155,931	$132,320
Distribution and service fees	14,359	11,334	9,718
Total	204,417	167,265	142,038
Related Party Transactions Summary [Abstract]	'	'	'
Proceeds from sales	10,715	103	3,333
Gross realized gains	615	4	317
Dividend income	9	3	36
Advisory fees waived	'	299	1,826
Fund expenses, included in general and administrative expenses	9,332	6,345	6,229
Receivables, company sponsored mutual funds	$18,026	$18,133	'
Maximum	'	'	'
Related Party Transactions Summary [Abstract]	'	'	'
Investment advisory agreement term	'10 years	'	'

Regulatory_Requirements_Detail

Regulatory Requirements (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities Registered Domestically	'
Financial Instruments Owned and Pledged as Collateral	'
Net Capital	$3,084
Excess Capital	2,977
Foreign Country	'
Financial Instruments Owned and Pledged as Collateral	'
Net Capital	51,796
Excess Capital	$48,366

Commitments_and_Contingencies_1

Commitments and Contingencies - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Loss Contingencies [Line Items]	'
Other Commitment	89,811,000
Commitments [Member]	'
Loss Contingencies [Line Items]	'
Long-term Purchase Commitments, Time Period	'12 years
Commitment to invest [Member]	'
Loss Contingencies [Line Items]	'
Other Commitment	5,100,000
Long-term committment, funded amount	2,600,000

Commitments_and_Contingencies_2

Commitments and Contingencies - Other Obligations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Aggregate Minimum Future Payments [Line Items]	'	'	'
2014	$7,839	'	'
2015	9,004	'	'
2016	8,754	'	'
2017	8,447	'	'
2018	8,447	'	'
Thereafter	47,320	'	'
Other Commitment	89,811	'	'
Sublease rental income	876	1,025	1,010
Rent expense	10,067	8,535	7,109
Gross Rent Obligations [Member]	'	'	'
Aggregate Minimum Future Payments [Line Items]	'	'	'
2014	7,914	'	'
2015	9,004	'	'
2016	8,754	'	'
2017	8,447	'	'
2018	8,447	'	'
Thereafter	47,320	'	'
Other Commitment	89,886	'	'
Sublease Income [Member]	'	'	'
Aggregate Minimum Future Payments [Line Items]	'	'	'
2014	-75	'	'
2015	0	'	'
2016	0	'	'
2017	0	'	'
2018	0	'	'
Thereafter	0	'	'
Other Commitment	($75)	'	'

Income_Taxes_Narrative_Details

Income Taxes - Narrative (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]	'	'	'	'
Effective tax rate	37.60%	35.50%	37.50%	'
Effective tax rate, excluding discrete items	38.00%	36.00%	'	'
Unrecognized deferred tax in investments of foreign subsidiaries	$65,761	'	'	'
Gross unrecognized tax benefits	5,927	4,899	4,712	4,729
Unrecognized tax benefits that impact effective tax rate in future periods	3,662	'	'	'
Reduction in unrecognized tax benefits due to lapse of applicable statute of limitations	768	'	'	'
Uncertain tax positions, accrued interest and penalties	$1,170	$710	'	'

Income_Taxes_Schedule_of_Incom

Income Taxes - Schedule of Income before Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income before provision for income taxes	'	'	'
U.S. income before provision for income taxes	$89,963	$89,828	$65,739
Foreign income before provision for income taxes	14,401	14,475	21,122
Income before provision for income taxes	104,364	104,303	86,861
Current taxes:	'	'	'
U.S. federal	36,490	29,723	24,685
State and local	5,025	3,754	3,357
Non-U.S.	2,681	3,103	4,957
Total	44,196	36,580	32,999
Deferred taxes:	'	'	'
U.S. federal	-2,754	-92	-320
State and local	-379	-12	-43
Non-U.S.	46	-69	-52
Deferred income taxes	-3,087	-173	-415
Provision for income taxes	$41,109	$36,407	$32,584

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Stock-based compensation	$7,953	$6,376
Non-deductible realized loss on sales of securities	6,706	7,109
Dividend equivalents on unvested restricted stock units	4,504	3,618
Unrealized gains on investments	-1,296	-1,596
Other	1,687	177
Subtotal	19,554	15,684
Less: valuation allowance	-5,410	-5,513
Deferred income tax asset - net	$14,144	$10,171

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Gross Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits [Roll Forward]	'	'	'
Gross unrecognized tax benefits balance	$4,899	$4,712	$4,729
Addition for tax positions of current year	1,421	933	832
Addition for tax positions of prior years	1,597	74	52
Reduction of tax positions from prior years	-1,990	-820	-901
Gross unrecognized tax benefits balance	$5,927	$4,899	$4,712

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Federal Statutory Income Tax Rate to Effective Rate (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
U.S. statutory tax rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal income taxes	4.80%	4.40%	4.80%
Non-deductibility of loss on securities	0.00%	0.00%	1.60%
Reserve adjustments	0.60%	-0.10%	-0.20%
Non-taxable gains on securities	-0.30%	-1.20%	0.00%
Foreign operations tax differential	-2.50%	-2.40%	-4.00%
Other	0.00%	-0.20%	0.30%
Effective income tax rate	37.60%	35.50%	37.50%

Concentration_of_Credit_Risk_D

Concentration of Credit Risk (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
									financial_institution
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Prior period adjustment to Japan revenue	'	'	'	'	'	'	'	'	'	$12,100,000	$1,100,000
Revenues	73,432,000	74,026,000	77,796,000	72,459,000	71,095,000	71,296,000	67,432,000	63,730,000	297,713,000	273,553,000	237,246,000
Number of financial institutions	'	'	'	'	'	'	'	'	3	'	'
Sales Revenue, Segment | Geographic Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	297,713,000	273,553,000	237,246,000
Sales Revenue, Segment | United States | Geographic Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	238,591,000	204,872,000	177,002,000
Sales Revenue, Segment | Japan | Geographic Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	42,603,000	53,356,000	42,735,000
Sales Revenue, Segment | Other | Geographic Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	16,519,000	15,325,000	17,509,000
Cohen & Steers Realty Shares, Inc. | Sales Revenue, Services | Customer Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Percent of total revenue	'	'	'	'	'	'	'	'	14.00%	13.00%	13.00%
Cohen & Steers Realty Shares, Inc. | Sales Revenue, Services | Investment advisory and administration fees | Customer Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	42,618,000	36,853,000	29,731,000
One Institutional Separate Account Relationship | Sales Revenue, Services | Customer Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	42,214,000	52,904,000	42,445,000
Percent of total revenue	'	'	'	'	'	'	'	'	14.00%	19.00%	18.00%
One Institutional Separate Account Relationship | Sales Revenue, Services | Investment advisory and administration fees | Customer Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	36,704,000	40,904,000	41,538,000
One Institutional Separate Account Relationship | Sales Revenue, Services | Portfolio consulting and other revenue | Customer Concentration Risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk (Line Items)	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	$5,510,000	$12,000,000	$907,000

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$73,432	$74,026	$77,796	$72,459	$71,095	$71,296	$67,432	$63,730	$297,713	$273,553	$237,246
Operating income	29,356	27,719	28,557	20,710	32,733	12,239	26,064	25,396	106,342	96,432	87,004
Net income attributable to common shareholders	$19,413	$18,283	$15,282	$15,141	$21,723	$10,261	$16,079	$18,054	$68,119	$66,117	$54,307
Earnings per share attributable to common shareholders:	'	'	'	'	'	'	'	'	'	'	'
Basic	$0.44	$0.41	$0.34	$0.34	$0.50	$0.23	$0.37	$0.41	$1.54	$1.51	$1.26
Diluted	$0.43	$0.41	$0.34	$0.34	$0.49	$0.23	$0.36	$0.41	$1.51	$1.49	$1.23
Weighted-average shares outstanding:	'	'	'	'	'	'	'	'	'	'	'
Basic	44,325	44,317	44,306	44,137	43,832	43,822	43,808	43,601	44,272	43,766	43,190
Diluted	45,338	45,106	45,002	44,882	44,609	44,537	44,393	44,386	45,083	44,482	43,975

Subsequent_Events_Details

Subsequent Events (Details) (Dividend Declared [Member], Subsequent Event [Member], USD $)	0 Months Ended
	Mar. 13, 2013
Dividend Declared [Member] | Subsequent Event [Member]	'
Subsequent Event [Line Items]	'
Dividends, Common Stock, Cash	$0.22