Virtus Investment Partners (VRTS) 10-Q 4 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 30, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'VRTS	'
Entity Registrant Name	'VIRTUS INVESTMENT PARTNERS, INC.	'
Entity Central Index Key	'0000883237	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	9,101,026

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$244,683	$63,432
Cash and cash equivalents of consolidated sponsored investment products	44	14
Trading securities, at fair value	18,917	12,392
Available-for-sale securities, at fair value	2,684	2,656
Investments of consolidated sponsored investment products	95,998	43,227
Accounts receivable, net	46,655	37,328
Deferred taxes, net	4,843	1,143
Prepaid expenses and other current assets	4,312	3,951
Other current assets of consolidated sponsored investment products	43,002	683
Total current assets	461,138	164,826
Furniture, equipment, and leasehold improvements, net	7,335	7,788
Intangible assets, net	45,907	48,711
Goodwill	5,260	5,260
Deferred taxes, net	63,274	95,780
Long-term investments ($3,783 and $2,970 at fair value, respectively) and other assets	18,720	10,384
Total assets	601,634	332,749
Current Liabilities	'	'
Accrued compensation and benefits	39,410	41,252
Accounts payable	10,842	7,582
Investment securities purchased of consolidated sponsored investment products	42,503	260
Other accrued liabilities	8,499	7,048
Other accrued liabilities of consolidated sponsored investment products	295	117
Broker-dealer payable	7,354	6,152
Total current liabilities	108,903	62,411
Long-term debt	'	15,000
Lease obligations and other long-term liabilities	8,072	7,704
Total liabilities	116,975	85,115
Commitments and Contingencies (Note 13)	'	'
Redeemable noncontrolling interests	18,855	3,163
Equity attributable to stockholders:	'	'
Common stock, $0.01 par value, 1,000,000,000 shares authorized; 9,450,798 shares issued and 9,100,798 shares outstanding at September 30, 2013 and 8,071,674 shares issued and 7,826,674 shares outstanding at December 31, 2012	95	81
Additional paid-in capital	1,133,350	942,825
Accumulated deficit	-629,977	-680,411
Accumulated other comprehensive loss	-177	-287
Treasury stock, at cost, 350,000 and 245,000 shares at September 30, 2013 and December 31, 2012, respectively	-37,438	-17,734
Total equity attributable to stockholders	465,853	244,474
Noncontrolling interest	-49	-3
Total equity	465,804	244,471
Total liabilities and equity	$601,634	$332,749

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Long-term investments and other assets, fair value	$3,783	$2,970
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	9,450,798	8,071,674
Common stock, shares outstanding	9,100,798	7,826,674
Treasury stock, shares	350,000	245,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues	'	'	'	'
Investment management fees	$67,119	$47,985	$189,371	$134,710
Distribution and service fees	20,322	14,661	57,007	40,969
Administration and transfer agent fees	12,492	8,774	35,248	24,199
Other income and fees	476	531	1,091	1,289
Total revenues	100,409	71,951	282,717	201,167
Operating Expenses	'	'	'	'
Employment expenses	33,022	25,899	98,311	77,724
Distribution and administration expenses	25,253	17,764	71,133	52,483
Other operating expenses	8,538	8,346	27,778	25,274
Other operating expenses of consolidated sponsored investment products	231	154	547	154
Restructuring and severance	'	555	203	1,349
Depreciation expense	610	435	1,782	1,194
Amortization expense	1,125	1,031	3,351	3,016
Total operating expenses	68,779	54,184	203,105	161,194
Operating Income	31,630	17,767	79,612	39,973
Other Income (Expense)	'	'	'	'
Realized and unrealized gain on trading securities, net	1,285	629	1,887	1,639
Realized and unrealized gain (loss) on investments of consolidated sponsored investment products, net	324	541	-2,460	541
Other income (expense), net	111	-16	82	-16
Total other income (expense), net	1,720	1,154	-491	2,164
Interest Income (Expense)	'	'	'	'
Interest expense	-207	-196	-634	-671
Interest and dividend income	126	98	426	375
Interest and dividend income of investments of consolidated sponsored investment products	600	98	1,692	98
Total interest income (expense), net	519	0	1,484	-198
Income Before Income Taxes	33,869	18,921	80,605	41,939
Income tax expense	12,567	7,279	30,335	16,480
Net Income	21,302	11,642	50,270	25,459
Noncontrolling interests	-213	'	164	'
Allocation of earnings to preferred stockholders	'	'	'	-64
Net Income Attributable to Common Stockholders	$21,089	$11,642	$50,434	$25,395
Earnings per share - Basic	$2.64	$1.48	$6.40	$3.30
Earnings per share - Diluted	$2.56	$1.43	$6.21	$3.15
Weighted Average Shares Outstanding - Basic (in thousands)	7,995	7,843	7,879	7,692
Weighted Average Shares Outstanding - Diluted (in thousands)	8,227	8,117	8,125	8,055

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net Income	$21,302	$11,642	$50,270	$25,459
Other comprehensive income (loss), net of tax:	'	'	'	'
Foreign currency translation adjustment, net of tax of ($23) and ($12) for the three and nine months ended September 30, 2013, respectively	37	'	19	'
Unrealized (loss) gain on available-for-sale securities, net of tax of $29 and $58 for the three months ended September 30, 2013 and 2012, respectively and $207 and $35 for the nine months ended September 30, 2013 and 2012, respectively	-48	-89	91	-54
Other comprehensive (loss) income	-11	-89	110	-54
Comprehensive income	21,291	11,553	50,380	25,405
Allocation of comprehensive income to preferred stockholders	'	'	'	-64
Comprehensive (income) loss attributable to noncontrolling interests	-213	'	164	'
Comprehensive income attributable to common stockholders	$21,078	$11,553	$50,544	$25,341

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Foreign currency translation adjustment, tax	($23)	'	($12)	'
Unrealized (loss) gain on available-for-sale securities, tax	$29	$58	$207	$35

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:	'	'
Net Income	$50,270	$25,459
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation expense	1,782	1,194
Intangible asset and other amortization	3,509	3,016
Stock-based compensation	5,983	5,366
Amortization of deferred commissions	10,032	8,089
Payments of deferred commissions	-13,993	-7,744
Realized and unrealized gains on trading securities	-1,887	-1,639
Realized and unrealized losses (gains) on investments of consolidated sponsored investment products	2,460	-541
(Purchases) and sales of trading securities, net	-1,163	691
Purchase of investments by consolidated sponsored investment products, net	-53,531	-35,024
Loss on disposal of fixed assets	29	17
Equity in earnings of affiliates	-98	'
Deferred income taxes	29,001	15,952
Changes in operating assets and liabilities:	'	'
Accounts receivable	-9,327	-5,747
Prepaid expenses and other assets	-781	-1,518
Other current assets of consolidated sponsored investment products	-40,944	'
Accounts payable and accrued liabilities	2,820	1,288
Other liabilities	966	3,511
Investment securities purchased of consolidated sponsored investment products	40,824	2,054
Other accrued liabilities of consolidated sponsored investment products	127	128
Net cash provided by operating activities	26,079	14,552
Cash Flows from Investing Activities:	'	'
Capital expenditures	-1,654	-2,612
Purchase of investment management contracts	'	-350
Change in cash and cash equivalents of consolidated sponsored investment products due to deconsolidation	-666	'
Acquisition of equity method investee	-3,364	'
Purchase of available-for-sale securities	-145	-232
Net cash used in investing activities	-5,829	-3,194
Cash Flows from Financing Activities:	'	'
Contingent consideration paid for acquired investment management contracts	-420	-510
Repurchase of common shares	-19,704	-3,059
Proceeds from exercise of stock options	478	1,787
Payment of deferred financing costs	-26	-563
Taxes paid related to net share settlement of restricted stock units	-7,493	-11,280
Proceeds from issuance of common stock, net of issuance costs	191,800	'
Repayment of debt	-15,000	'
Contributions of noncontrolling interests, net	11,396	235
Net cash provided by (used in) financing activities	161,031	-13,390
Net increase (decrease) in cash and cash equivalents	181,281	-2,032
Cash and cash equivalents, beginning of period	63,446	45,267
Cash and Cash Equivalents, end of period	244,727	43,235
Non-Cash Financing Activities:	'	'
Increase to noncontrolling interests due to net consolidation (deconsolidation) of sponsored investment products	4,414	'
Preferred stock conversion	'	$35,217

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Attributed To Shareholders [Member]	Non-controlling Interest [Member]	Redeemable Non-controlling Interest [Member]
In Thousands, except Share data
Beginning Balance at Dec. 31, 2011	$183,155	$63	$909,983	($718,083)	($14)	($8,794)	$183,155	'	'
Beginning Balance, shares at Dec. 31, 2011	'	6,188,295	'	'	'	155,000	'	'	'
Net income (loss)	25,459	'	'	25,459	'	'	25,459	'	'
Net unrealized gain (loss) on securities available-for-sale	-54	'	'	'	-54	'	-54	'	'
Activity of noncontrolling interests, net	'	'	'	'	'	'	'	'	235
Preferred stock conversion	35,217	14	35,203	'	'	'	35,217	'	'
Preferred stock conversion, shares	'	1,349,300	'	'	'	'	'	'	'
Repurchase of common shares	-3,060	'	'	'	'	-3,060	-3,060	'	'
Repurchase of common shares, shares	'	-35,000	'	'	'	35,000	'	'	'
Issuance of common stock related to employee stock transactions	2,339	3	2,336	'	'	'	2,339	'	'
Issuance of common stock related to employee stock transactions, shares	'	334,817	'	'	'	'	'	'	'
Taxes paid on stock-based compensation	-11,280	'	-11,280	'	'	'	-11,280	'	'
Stock-based compensation	4,921	'	4,921	'	'	'	4,921	'	'
Ending Balance at Sep. 30, 2012	236,697	80	941,163	-692,624	-68	-11,854	236,697	'	235
Ending Balance, shares at Sep. 30, 2012	'	7,837,412	'	'	'	190,000	'	'	'
Beginning Balance at Dec. 31, 2012	244,474	81	942,825	-680,411	-287	-17,734	244,474	-3	3,163
Beginning Balance, shares at Dec. 31, 2012	'	7,826,674	'	'	'	245,000	'	'	'
Net income (loss)	50,270	'	'	50,434	'	'	50,434	-46	-118
Net unrealized gain (loss) on securities available-for-sale	91	'	'	'	91	'	91	'	'
Foreign currency translation adjustment	19	'	'	'	19	'	19	'	'
Activity of noncontrolling interests, net	'	'	'	'	'	'	'	'	15,810
Issuance of common stock, net	191,581	13	191,568	'	'	'	191,581	'	'
Issuance of common stock, net, shares	'	1,298,386	'	'	'	'	'	'	'
Repurchase of common shares	-19,704	'	'	'	'	-19,704	-19,704	'	'
Repurchase of common shares, shares	'	-105,000	'	'	'	105,000	'	'	'
Issuance of common stock related to employee stock transactions	983	1	982	'	'	'	983	'	'
Issuance of common stock related to employee stock transactions, shares	'	80,738	'	'	'	'	'	'	'
Taxes paid on stock-based compensation	-7,493	'	-7,493	'	'	'	-7,493	'	'
Stock-based compensation	5,468	'	5,468	'	'	'	5,468	'	'
Ending Balance at Sep. 30, 2013	$465,804	$95	$1,133,350	($629,977)	($177)	($37,438)	$465,853	($49)	$18,855
Ending Balance, shares at Sep. 30, 2013	'	9,100,798	'	'	'	350,000	'	'	'

Organization_and_Business

Organization and Business	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Organization and Business	'
	1. Organization and Business
	Virtus Investment Partners, Inc. (the “Company,” “we,” “us,” “our” or “Virtus”), a Delaware corporation, operates in the investment management industry through its wholly-owned subsidiaries.
	The Company provides investment management and related services to individuals and institutions throughout the United States of America. The Company’s retail investment management services are provided to individuals through products consisting of open-end mutual funds, closed-end funds, variable insurance funds and separately managed accounts. Separately managed accounts are offered through intermediary programs that are sponsored and distributed by unaffiliated broker-dealers, and individual direct managed account investment services that are provided by the Company. Institutional investment management services are provided primarily to corporations, multi-employer retirement funds, public employee retirement systems, foundations and endowments and special purpose funds.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation and Significant Accounting Policies	'
	2. Basis of Presentation and Significant Accounting Policies
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, these financial statements contain all adjustments, consisting only of normal recurring adjustments, necessary for fair presentation of the Company’s financial condition and results of operations. The condensed consolidated financial statements include the accounts of the Company, its wholly-owned subsidiaries and sponsored investment products in which it has a controlling interest. Material intercompany accounts and transactions have been eliminated. Operating results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013.
	These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 filed with the Securities and Exchange Commission (“SEC”). The Company’s significant accounting policies, which have been consistently applied, are summarized in the Company’s 2012 Annual Report on Form 10-K.
	Certain amounts in the prior years’ financial statements have been reclassified to conform to the current year’s presentation.

Intangible_Assets_Net

Intangible Assets, Net	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Intangible Assets, Net	'
	3. Intangible Assets, Net
	Intangible assets, net are summarized as follows:
		September 30,			December 31,
		2013			2012
	($ in thousands)
	Definite-lived intangible assets:
	Investment contracts	$	162,358		$	197,704
	Accumulated amortization		(148,867	)		(181,409	)
	Definite-lived intangible assets, net		13,491			16,295
	Indefinite-lived intangible assets		32,416			32,416
	Total intangible assets, net	$	45,907		$	48,711
	Activity in intangible assets, net is as follows:
		Nine Months Ended
		September 30,
		2013			2012
	($ in thousands)
	Intangible assets, net
	Balance, beginning of period	$	48,711		$	52,096
	Purchases		356			350
	Amortization		(3,160	)		(2,893	)
	Balance, end of period	$	45,907		$	49,553

Equity_Method_Investment_in_Af

Equity Method Investment in Affiliate	9 Months Ended
	Sep. 30, 2013
Equity Method Investments And Joint Ventures [Abstract]	'
Equity Method Investment in Affiliate	'
	4. Equity Method Investment in Affiliate
	On April 9, 2013, the Company acquired a 24% noncontrolling equity interest in Kleinwort Benson Investors International, Ltd. (“KBII”), a subsidiary of Kleinwort Benson Investors (Dublin) (“KBID”) for €2.6 million or $3.4 million. KBII is a U.S. registered investment adviser that provides specialized equity strategies to institutional clients. As of the date of acquisition, the Company allocated $2.5 million of this investment to goodwill, $0.6 million to definite-lived intangible assets that are being amortized over 7 years and $0.3 million allocated to the remaining assets and liabilities of KBII. In conjunction with this investment, the Company entered into a put and call option with KBID.
	The Company’s investment is a Euro-denominated noncontrolled affiliate that is accounted for under the equity method of accounting in accordance with Accounting Standard Codification (“ASC”) 323, Investments-Equity Method and Joint Ventures. The entire investment in KBII, including goodwill and definite-lived intangible assets, is recorded on the Condensed Consolidated Balance Sheet within long-term investments and other assets. Under the equity method of accounting, the Company’s share of the noncontrolled affiliate’s net income or loss is recorded in other income (expense), net in the accompanying Condensed Consolidated Statement of Operations. Distributions received reduce the Company’s investment balance. The investment is evaluated for impairment as events or changes indicate that the carrying amount exceeds its fair value. If the carrying amount of this investment does exceed fair value and the decline in fair value is deemed to be other than temporary, an impairment charge will be recorded. If the carrying amounts of the assets exceed their respective fair values, additional impairment tests are performed to measure the amount of the impairment loss, if any.
	This investment is translated into U.S. dollars at current exchange rates as of the end of each accounting period. Net income or loss of the noncontrolled affiliate is translated at average exchange rates in effect during the accounting period. Net translation exchange gains and losses are excluded from income and recorded in accumulated other comprehensive income.

Marketable_Securities

Marketable Securities	9 Months Ended
	Sep. 30, 2013
Cash And Cash Equivalents [Abstract]	'
Marketable Securities	'
	5. Marketable Securities
	The Company’s marketable securities consist of trading securities, investments of consolidated sponsored investment products, and available-for-sale securities. The composition of the Company’s marketable securities as of September 30, 2013 and December 31, 2012 is summarized as follows:
	September 30, 2013
		Cost		Unrealized			Unrealized		Fair
				Loss			Gain		Value
	($ in thousands)
	Trading:
	Sponsored mutual funds and variable insurance funds	$	11,845	$	(685	)	$	2,653	$	13,813
	Equity securities		3,898		—			1,206		5,104
	Investments of consolidated sponsored investment products:
	Debt securities		29,598		(2,154	)		165		27,609
	Equity securities		66,679		(415	)		2,125		68,389
	Available-for-sale:
	Sponsored closed-end funds		2,764		(125	)		45		2,684
	Total marketable securities	$	114,784	$	(3,379	)	$	6,194	$	117,599
	December 31, 2012
		Cost		Unrealized			Unrealized		Fair
				Loss			Gain		Value
	($ in thousands)
	Trading:
	Sponsored mutual funds and variable insurance funds	$	7,312	$	(689	)	$	1,390	$	8,013
	Equity securities		3,739		—			640		4,379
	Investments of consolidated sponsored investment products:
	Debt securities		24,830		(21	)		1,003		25,812
	Equity securities		16,537		(144	)		1,022		17,415
	Available-for-sale:
	Sponsored closed-end funds		2,619		(37	)		74		2,656
	Total marketable securities	$	55,037	$	(891	)	$	4,129	$	58,275

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	6. Fair Value Measurements
	The Company’s assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 by fair value hierarchy level were as follows:
	September 30, 2013
		Level 1		Level 2		Level 3		Total
	($ in thousands)
	Assets
	Marketable securities trading:
	Sponsored mutual funds and variable insurance funds	$	13,813	$	—	$	—	$	13,813
	Equity securities		5,104		—		—		5,104
	Investments of consolidated sponsored investment products:
	Debt securities		—		27,609		—		27,609
	Equity securities		67,449		940		—		68,389
	Marketable securities available for sale:
	Sponsored closed-end funds		2,684		—		—		2,684
	Other assets
	Nonqualified retirement plan assets		3,783		—		—		3,783
	Total assets measured at fair value	$	92,833	$	28,549	$	—	$	121,382
	December 31, 2012
		Level 1		Level 2		Level 3		Total
	($ in thousands)
	Assets
	Marketable securities trading:
	Sponsored mutual funds and variable insurance funds	$	8,013	$	—	$	—	$	8,013
	Equity securities		4,379		—		—		4,379
	Investments of consolidated sponsored investment products:
	Debt securities		—		25,812		—		25,812
	Equity securities		10,092		7,323		—		17,415
	Marketable securities available for sale:
	Sponsored closed-end funds		2,656		—		—		2,656
	Other assets
	Nonqualified retirement plan assets		2,970		—		—		2,970
	Total assets measured at fair value	$	28,110	$	33,135	$	—	$	61,245
	The following is a discussion of the valuation methodologies used for assets measured at fair value.
	Sponsored mutual funds and variable insurance funds represent investments in open-end mutual funds and variable insurance funds for which the Company acts as advisor and distributor. The fair value of these securities is determined based on their published net asset values and are categorized as Level 1.
	Investments of consolidated sponsored investment products represent the underlying debt and equity securities held in sponsored mutual funds in which the Company has an investment and are consolidated by the Company. Equity securities are valued at the official closing price on the exchange on which the securities are traded and are categorized within Level 1. Level 2 investments include certain non-U.S. securities for which closing prices are not readily available or are deemed to not reflect readily available market prices and are valued using an independent pricing service as well as most debt securities which are valued based on quotations received from independent pricing services or from dealers who make markets in such securities. Pricing services do not provide pricing for all securities and therefore indicative bids from dealers are utilized, which are based on pricing models used by market makers in the security and are also included within Level 2.
	Equity securities include securities traded on active markets and are valued at the official closing price (typically last sale or bid) on the exchange on which the securities are primarily traded and are classified within Level 1.
	Sponsored closed-end funds represent investments for which the Company acts as advisor and are actively traded on the New York Stock Exchange. The fair value of these securities is determined based on the official closing price and are categorized as Level 1.
	Nonqualified retirement plan assets represent mutual funds within a nonqualified retirement plan whose fair value is determined based on their published net asset value and are classified as Level 1.
	Cash and cash equivalents, accounts receivable, accounts payable and accrued liabilities equal or approximate fair value based on the short-term nature of these instruments. The estimated fair value of long-term debt at December 31, 2012, which has a variable interest rate, approximates its carrying value and is classified as Level 2. Marketable securities are reflected in the financial statements at fair value based upon publicly quoted market prices.
	Transfers into and out of levels are reflected when significant inputs, including market inputs or performance attributes, used for the fair value measurement become observable or unobservable or when the Company determines it has the ability, or no longer has the ability, to redeem, in the near term, certain investments that the Company values using a net asset value, or if the book value of certain equity method investments no longer represents fair value. Securities held by the consolidated sponsored investment products, with an end-of-period value of $5.2 million were transferred from Level 2 to Level 1 during the nine months ended September 30, 2013 due to the availability of unadjusted quoted market prices in active markets. There were no transfers from Level 1 to Level 2 during the nine months ended September 30, 2013. There were no transfers between Level 1 and Level 2 during the nine months ended September 30, 2012.

Equity_Transactions

Equity Transactions	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Equity Transactions	'
	7. Equity Transactions
	During September 2013, the Company issued 1.3 million shares of common stock in a public offering for net proceeds of $191.6 million after underwriting discounts, commissions and other offering expenses, pursuant to an already effective shelf registration statement.
	During the nine months ended September 30, 2013, pursuant to the Company’s initial share repurchase program implemented in the fourth quarter of 2010, the Company repurchased 105,000 common shares at a weighted average price of $187.61 per share plus transaction costs for a total cost of approximately $19.7 million. During the nine months ended September 30, 2012, the Company repurchased 35,000 common shares at a weighted average price of $87.41 per share for a total cost of approximately $3.1 million under the initial share repurchase program. As of September 30, 2013, the Company has repurchased a total of 350,000 shares of common stock at a weighted average price of $106.92 per share plus transaction costs for a total cost of $37.4 million completing the initial share repurchase program.
	In May 2013, the Company’s board of directors authorized an extension of its share repurchase program to permit the purchase of an additional 350,000 shares of common stock prior to May 21, 2016. At September 30, 2013, there were 350,000 shares of common stock remaining authorized for repurchase under the extended share repurchase program.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Accumulated Other Comprehensive Income	'
	8. Accumulated Other Comprehensive Income
	The changes in accumulated other comprehensive income by component for the nine months ended September 30, 2013 and 2012 are as follows:
	($ in thousands)	Unrealized Gains			Foreign Currency
		and (Losses)			Translation Adjustments
		on Securities
		Available-for-
		Sale
	Balance December 31, 2012	$	(287	)	$	—
	Unrealized net gains on investments, net of tax of $207		91			—
	Foreign currency translation adjustments, net of tax of ($12)		—			19
	Amounts reclassified from accumulated other comprehensive income		—			—
	Net current-period other comprehensive income		91			19
	Balance September 30, 2013	$	(196	)	$	19
	($ in thousands)	Unrealized
		Losses
		on Securities
		Available-for-
		Sale
	Balance December 31, 2011	$	(14	)
	Unrealized net losses on investments, net of tax of $35		(54	)
	Amounts reclassified from accumulated other comprehensive income		—
	Net current-period other comprehensive income		(54	)
	Balance September 30, 2012	$	(68	)

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	9. Related Party Transactions
	In May 2006, the Company acquired the rights to advise, distribute and administer the Insight Funds from BMO Asset Management Corp. (“BMO”), a subsidiary of BMO Financial Corp. BMO and BMO Financial Corp., a significant stockholder of the Company, are related parties of the Company.
	Sub-advisory investment management fees and distribution and administration fee expenses paid or payable to BMO were $0.1 million and $0.4 million for the three months ended September 30, 2013 and 2012, respectively and $0.5 million and $1.8 million for the nine months ended September 30, 2013 and 2012, respectively. At both September 30, 2013 and December 31, 2012, less than $0.1 million was payable to BMO and its affiliates related to sub-advisory investment management fees and distribution fees.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	10. Stock-Based Compensation
	The Company has an Omnibus Incentive and Equity Plan (the “Plan”) under which employees, directors and consultants may be granted equity-based awards, including restricted stock units (“RSUs”), stock options and unrestricted shares of common stock. At September 30, 2013, 496,694 shares of common stock remain available for issuance of the 1,800,000 shares that were reserved for issuance under the Plan. Each RSU entitles the holder to one share of Virtus common stock when the restriction expires. RSUs generally have a term of three years and may be time-vested or performance-contingent. Stock options generally vest over three years and have a contractual life of ten years. Stock options are granted with an exercise price equal to the fair market value of the shares at the date of grant. The fair value of each RSU is estimated using the intrinsic value method, which is based on the fair market value price on the date of grant. Shares that are issued upon exercise of employee stock options and vesting of RSUs are newly issued shares and not issued from treasury stock.
	Restricted Stock Units
	RSU activity for the nine months ended September 30, 2013 is summarized as follows:
		Number			Weighted
		of Shares			Average
					Grant Date
					Fair Value
	Outstanding at December 31, 2012		292,057		$	57.89
	Granted		46,000		$	188.36
	Forfeited		(11,942	)	$	88
	Settled		(91,269	)	$	38.23
	Outstanding at September 30, 2013		234,846		$	88.26
	For the nine months ended September 30, 2013, a total of 38,128 RSUs were withheld by the Company as a result of net share settlements to satisfy employee tax withholding obligations. During the nine months ended September 30, 2013, the Company paid $7.5 million in employee tax withholding obligations related to the RSUs withheld. These net share settlements had the effect of share repurchases by the Company as they reduced the number of shares that would have been otherwise issued as a result of the vesting.
	Stock Options
	Stock option activity for the nine months ended September 30, 2013 is summarized as follows:
		Number			Weighted
		of Shares			Average
					Exercise Price
	Outstanding at December 31, 2012		220,349		$	20.03
	Exercised		(25,512	)	$	18.76
	Forfeited		(363	)	$	55.18
	Outstanding at September 30, 2013		194,474		$	20.13
	During the three months ended September 30, 2013 and 2012, the Company recognized $2.0 million and $1.6 million, respectively, in total stock-based compensation expense. During the nine months ended September 30, 2013 and 2012, the Company recognized $6.0 million and $5.4 million, respectively, in total stock-based compensation expense. As of September 30, 2013, unamortized stock-based compensation expense for unvested RSUs and stock options was $11.2 million and $0.1 million, respectively, with weighted-average remaining amortization periods of 1.2 years and 0.5 years, respectively.

Earnings_per_Share

Earnings per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings per Share	'
	11. Earnings per Share
	Basic earnings per share (“EPS”) excludes dilution for potential common stock issuances and is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. For the calculation of diluted EPS, the basic weighted-average number of shares is increased by the dilutive effect of RSUs and stock options using the treasury stock method.
	The computation of basic and diluted EPS is as follows:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013		2012
	($ in thousands, except per share amounts)
	Net Income	$	21,302		$	11,642	$	50,270	$	25,459
	Noncontrolling interests		(213	)		—		164		—
	Allocation of earnings to preferred stockholders		—			—		—		(64	)
	Net Income Attributable to Common Stockholders	$	21,089		$	11,642		50,434	$	25,395
	Shares (in thousands):
	Basic: Weighted-average number of shares outstanding		7,995			7,843		7,879		7,692
	Plus: Incremental shares from assumed conversion of dilutive instruments		232			274		246		363
	Diluted: Weighted-average number of shares outstanding		8,227			8,117		8,125		8,055
	Earnings per share - basic	$	2.64		$	1.48	$	6.4	$	3.3
	Earnings per share - diluted	$	2.56		$	1.43	$	6.21	$	3.15
	For the three and nine months ended September 30, 2013, respectively, there were 3,115 instruments excluded from the above computation of weighted-average shares for diluted EPS because the effect would be anti-dilutive. For the three and nine months ended September 30, 2012, respectively, there were no instruments excluded from the above computation of weighted-average shares for diluted EPS because the effect would be anti-dilutive.

Long_Term_Debt

Long Term Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Long Term Debt	'
	12. Long Term Debt
	During the third quarter of 2013, the Company repaid the $15.0 million outstanding balance under its senior secured revolving credit facility (“Credit Facility”). As of September 30, 2013, no amount remains outstanding and the Company had the capacity to draw on the full $75.0 million available under the Credit Facility.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	13. Commitments and Contingencies
	The Company can be involved in litigation and arbitration as well as examinations and investigations by various regulatory bodies, including the SEC, involving its compliance with, among other things, securities laws, client investment guidelines, laws governing the activities of broker-dealers and other laws and regulations affecting its products, subadvisors and other activities. Legal and regulatory matters of this nature may involve activities of the Company as an employer, issuer of securities, investor, investment advisor, broker-dealer or taxpayer. The Company cannot predict the ultimate outcome of such legal claims or matters or in certain instances provide reasonable ranges of potential losses. As of the date of this report, the Company believes that the outcomes of its legal or regulatory matters are not likely, either individually or in the aggregate, to have a material adverse effect on its consolidated financial statements. However, in the event of unexpected subsequent developments and given the inherent unpredictability of these legal and regulatory matters, there can be no assurance that the Company’s assessment of any claim, dispute, regulatory examination or investigation or other legal matter will reflect the ultimate outcome and an adverse outcome in certain matters could, from time to time, have a material adverse effect on the Company’s results of operations or cash flows in particular quarterly or annual periods.

Consolidation_of_Sponsored_Inv

Consolidation of Sponsored Investment Products	9 Months Ended
	Sep. 30, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Consolidation of Sponsored Investment Products	'
	14. Consolidation of Sponsored Investment Products
	In the normal course of its business, the Company sponsors and is the manager of various types of investment products. During the nine months ended September 30, 2013 and the year ended December 31, 2012, the Company sponsored and consolidated several mutual funds in which it had a majority voting interest. The consolidation of these investment products has no impact on net income attributable to stockholders. The Company’s risk with respect to these investments is limited to its investment in these products. The Company has no right to the benefits from, nor does it bear the risks associated with, these investment products, beyond the Company’s investments in, and fees generated from these products. If the Company were to liquidate, these investments would not be available to the general creditors of the Company. The Company does not consider cash and cash equivalents and investments held by consolidated sponsored investment products to be assets of the Company other than its direct investment in these products.
	During the nine months ended September 30, 2013, the Company consolidated three additional mutual funds and deconsolidated three mutual funds because it no longer had a majority voting interest. As of September 30, 2013, the Company consolidated a total of eight mutual funds.
	The following tables reflect the impact of the consolidated sponsored investment products in the Condensed Consolidated Balance Sheets as of September 30, 2013 and December 31, 2012 respectively:
	As of September 30, 2013
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment Products			Products			Adjustments (a)			Condensed
												Consolidated
												Balance Sheet
	($ in thousands)
	Current assets		$	399,485		$	139,044	(1)	$	(77,391	)	$	461,138
	Non-current assets			140,496			—			—			140,496
	Total assets		$	539,981		$	139,044		$	(77,391	)	$	601,634
	Current liabilities		$	66,105		$	42,824		$	(26	)	$	108,903
	Non-current liabilities			8,072			—			—			8,072
	Total liabilities			74,177			42,824			(26	)		116,975
	Redeemable noncontrolling interest			—			—			18,855			18,855
	Equity attributable to stockholders of the Company			465,853			96,220			(96,220	)		465,853
	Non-redeemable noncontrolling interest			(49	)		—			—			(49	)
	Total liabilities and equity		$	539,981		$	139,044		$	(77,391	)	$	601,634
	As of December 31, 2012
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment Products			Products			Adjustments (a)			Consolidated
												Balance Sheet
	($ in thousands)
	Current assets		$	161,286		$	43,924		$	(40,384	)	$	164,826
	Non-current assets			167,923			—			—			167,923
	Total assets		$	329,209		$	43,924		$	(40,384	)	$	332,749
	Current liabilities		$	62,034		$	364		$	13		$	62,411
	Other non-current liabilities			22,704			—			—			22,704
	Total liabilities			84,738			364			13			85,115
	Redeemable noncontrolling interest			—			—			3,163			3,163
	Equity attributable to stockholders of the Company			244,474			43,560			(43,560	)		244,474
	Non-redeemable noncontrolling interest			(3	)		—			—			(3	)
	Total liabilities and equity		$	329,209		$	43,924		$	(40,384	)	$	332,749
	-1	Includes other current assets of $41.0 million related to unsettled fund share receivables of consolidated sponsored investment products at September 30, 2013.
	The following table reflects the impact of the consolidated sponsored investment products in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2013 and 2012:
	For the Three Months Ended September 30, 2013
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
	($ in thousands)
	Total operating revenues		$	100,319		$	—		$	90		$	100,409
	Total operating expenses			68,547			142			90			68,779
	Operating income (loss)			31,772			(142	)		—			31,630
	Total other non-operating income (expense)			1,870			923			(554	)		2,239
	Income (loss) before income tax expense			33,642			781			(554	)		33,869
	Income tax expense			12,567			—			—			12,567
	Net income (loss)			21,075			781			(554	)		21,302
	Noncontrolling interests			14			—			(227	)		(213	)
	Net income (loss) attributable to the Company		$	21,089		$	781		$	(781	)	$	21,089
	For the Three Months Ended September 30, 2012
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
($ in thousands)
Total operating revenues		$	71,825		$	—		$	126		$	71,951
Total operating expenses			54,030			28			126			54,184
Operating income (loss)			17,795			(28	)		—			17,767
Total other non-operating income (expense)			1,126			639			(611	)		1,154
Income (loss) before income tax expense			18,921			611			(611	)		18,921
Income tax expense			7,279			—			—			7,279
Net income (loss)			11,642			611			(611	)		11,642
Noncontrolling interests			—			—			—			—
Net income (loss) attributable to the Company		$	11,642		$	611		$	(611	)	$	11,642
For the Nine Months Ended September 30, 2013
		Balance Before			Consolidated			Eliminations			Balances as
		Consolidation of			Investment			and			Reported in
		Investment			Products			Adjustments (a)			Condensed
		Products									Consolidated
											Statement of
											Operations
($ in thousands)
Total operating revenues		$	282,575		$	—		$	142		$	282,717
Total operating expenses			202,557			406			142			203,105
Operating income (loss)			80,018			(406	)		—			79,612
Total other non-operating income (expense)			705			(768	)		1,056			993
Income (loss) before income tax expense			80,723			(1,174	)		1,056			80,605
Income tax expense			30,335			—			—			30,335
Net income (loss)			50,388			(1,174	)		1,056			50,270
Noncontrolling interests			46			—			118			164
Net income (loss) attributable to the Company		$	50,434		$	(1,174	)	$	1,174		$	50,434
For the Nine Months Ended September 30, 2012
		Balance Before			Consolidated			Eliminations			Balances as
		Consolidation of			Investment			and			Reported in
		Investment			Products			Adjustments (a)			Condensed
		Products									Consolidated
											Statement of
											Operations
Total operating revenues		$	201,041		$	—		$	126		$	201,167
Total operating expenses			161,040			28			126			161,194
Operating income (loss)			40,001			(28	)		—			39,973
Total other non-operating income (expense)			1,938			639			(611	)		1,966
Income (loss) before income tax expense			41,939			611			(611	)		41,939
Income tax expense			16,480			—			—			16,480
Net income (loss)			25,459			611			(611	)		25,459
Allocation of earnings to preferred stockholders			(64	)		—			—			(64	)
Net income (loss) attributable to the Company		$	25,395		$	611		$	(611	)	$	25,395
(a)	Adjustments include the elimination of intercompany transactions between the Company and its consolidated sponsored investment products, primarily the elimination of the investments and equity and recording of any noncontrolling interest.

New_Accounting_Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2013
Accounting Changes And Error Corrections [Abstract]	'
New Accounting Standards	'
	14. New Accounting Standards
	In October 2012, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2012-04, Technical Corrections and Improvements. This update amends source literature, clarifies guidance and reference corrections and relocates some guidance within the ASC. The Company adopted this standard as of January 2013.
	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified out of Accumulated Other Comprehensive Income. Under ASU 2013-02, an entity is required to provide information about the amounts reclassified out of Accumulated Other Comprehensive Income (“AOCI”) by component. In addition, an entity is required to present, either on the face of the financial statements or in the notes thereto, significant amounts reclassified out of AOCI by the respective line items of net income, but only if the amount reclassified is required to be reclassified in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, an entity is required to cross-reference to other disclosures that provide additional details about those amounts. ASU 2013-02 does not change the current requirements for reporting net income or other comprehensive income in the financial statements. The Company has adopted this standard as of January 2013.

Equity_Method_Investment_in_Af1

Equity Method Investment in Affiliate (Policies)	9 Months Ended
	Sep. 30, 2013
Equity Method Investments And Joint Ventures [Abstract]	'
Investments-Equity Method and Joint Ventures	'
	The Company’s investment is a Euro-denominated noncontrolled affiliate that is accounted for under the equity method of accounting in accordance with Accounting Standard Codification (“ASC”) 323, Investments-Equity Method and Joint Ventures. The entire investment in KBII, including goodwill and definite-lived intangible assets, is recorded on the Condensed Consolidated Balance Sheet within long-term investments and other assets. Under the equity method of accounting, the Company’s share of the noncontrolled affiliate’s net income or loss is recorded in other income (expense), net in the accompanying Condensed Consolidated Statement of Operations. Distributions received reduce the Company’s investment balance. The investment is evaluated for impairment as events or changes indicate that the carrying amount exceeds its fair value. If the carrying amount of this investment does exceed fair value and the decline in fair value is deemed to be other than temporary, an impairment charge will be recorded. If the carrying amounts of the assets exceed their respective fair values, additional impairment tests are performed to measure the amount of the impairment loss, if any.

Intangible_Assets_Net_Tables

Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Summary of Intangible Assets	'
	Intangible assets, net are summarized as follows:
		September 30,			December 31,
		2013			2012
	($ in thousands)
	Definite-lived intangible assets:
	Investment contracts	$	162,358		$	197,704
	Accumulated amortization		(148,867	)		(181,409	)
	Definite-lived intangible assets, net		13,491			16,295
	Indefinite-lived intangible assets		32,416			32,416
	Total intangible assets, net	$	45,907		$	48,711
Schedule of Activity in Intangible Assets	'
	Activity in intangible assets, net is as follows:
		Nine Months Ended
		September 30,
		2013			2012
	($ in thousands)
	Intangible assets, net
	Balance, beginning of period	$	48,711		$	52,096
	Purchases		356			350
	Amortization		(3,160	)		(2,893	)
	Balance, end of period	$	45,907		$	49,553

Marketable_Securities_Tables

Marketable Securities (Tables)	9 Months Ended
	Sep. 30, 2013
Cash And Cash Equivalents [Abstract]	'
Schedule of Marketable Securities	'
	The Company’s marketable securities consist of trading securities, investments of consolidated sponsored investment products, and available-for-sale securities. The composition of the Company’s marketable securities as of September 30, 2013 and December 31, 2012 is summarized as follows:
	September 30, 2013
		Cost		Unrealized			Unrealized		Fair
				Loss			Gain		Value
	($ in thousands)
	Trading:
	Sponsored mutual funds and variable insurance funds	$	11,845	$	(685	)	$	2,653	$	13,813
	Equity securities		3,898		—			1,206		5,104
	Investments of consolidated sponsored investment products:
	Debt securities		29,598		(2,154	)		165		27,609
	Equity securities		66,679		(415	)		2,125		68,389
	Available-for-sale:
	Sponsored closed-end funds		2,764		(125	)		45		2,684
	Total marketable securities	$	114,784	$	(3,379	)	$	6,194	$	117,599
	December 31, 2012
		Cost		Unrealized			Unrealized		Fair
				Loss			Gain		Value
	($ in thousands)
	Trading:
	Sponsored mutual funds and variable insurance funds	$	7,312	$	(689	)	$	1,390	$	8,013
	Equity securities		3,739		—			640		4,379
	Investments of consolidated sponsored investment products:
	Debt securities		24,830		(21	)		1,003		25,812
	Equity securities		16,537		(144	)		1,022		17,415
	Available-for-sale:
	Sponsored closed-end funds		2,619		(37	)		74		2,656
	Total marketable securities	$	55,037	$	(891	)	$	4,129	$	58,275

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The Company’s assets measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 by fair value hierarchy level were as follows:
	September 30, 2013
		Level 1		Level 2		Level 3		Total
	($ in thousands)
	Assets
	Marketable securities trading:
	Sponsored mutual funds and variable insurance funds	$	13,813	$	—	$	—	$	13,813
	Equity securities		5,104		—		—		5,104
	Investments of consolidated sponsored investment products:
	Debt securities		—		27,609		—		27,609
	Equity securities		67,449		940		—		68,389
	Marketable securities available for sale:
	Sponsored closed-end funds		2,684		—		—		2,684
	Other assets
	Nonqualified retirement plan assets		3,783		—		—		3,783
	Total assets measured at fair value	$	92,833	$	28,549	$	—	$	121,382
	December 31, 2012
		Level 1		Level 2		Level 3		Total
	($ in thousands)
	Assets
	Marketable securities trading:
	Sponsored mutual funds and variable insurance funds	$	8,013	$	—	$	—	$	8,013
	Equity securities		4,379		—		—		4,379
	Investments of consolidated sponsored investment products:
	Debt securities		—		25,812		—		25,812
	Equity securities		10,092		7,323		—		17,415
	Marketable securities available for sale:
	Sponsored closed-end funds		2,656		—		—		2,656
	Other assets
	Nonqualified retirement plan assets		2,970		—		—		2,970
	Total assets measured at fair value	$	28,110	$	33,135	$	—	$	61,245

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Changes in Accumulated Other Comprehensive Income	'
	The changes in accumulated other comprehensive income by component for the nine months ended September 30, 2013 and 2012 are as follows:
	($ in thousands)	Unrealized Gains			Foreign Currency
		and (Losses)			Translation Adjustments
		on Securities
		Available-for-
		Sale
	Balance December 31, 2012	$	(287	)	$	—
	Unrealized net gains on investments, net of tax of $207		91			—
	Foreign currency translation adjustments, net of tax of ($12)		—			19
	Amounts reclassified from accumulated other comprehensive income		—			—
	Net current-period other comprehensive income		91			19
	Balance September 30, 2013	$	(196	)	$	19
	($ in thousands)	Unrealized
		Losses
		on Securities
		Available-for-
		Sale
	Balance December 31, 2011	$	(14	)
	Unrealized net losses on investments, net of tax of $35		(54	)
	Amounts reclassified from accumulated other comprehensive income		—
	Net current-period other comprehensive income		(54	)
	Balance September 30, 2012	$	(68	)

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Restricted Stock Units Activity	'
	RSU activity for the nine months ended September 30, 2013 is summarized as follows:
		Number			Weighted
		of Shares			Average
					Grant Date
					Fair Value
	Outstanding at December 31, 2012		292,057		$	57.89
	Granted		46,000		$	188.36
	Forfeited		(11,942	)	$	88
	Settled		(91,269	)	$	38.23
	Outstanding at September 30, 2013		234,846		$	88.26
Summary of Stock Option Activity	'
	Stock option activity for the nine months ended September 30, 2013 is summarized as follows:
		Number			Weighted
		of Shares			Average
					Exercise Price
	Outstanding at December 31, 2012		220,349		$	20.03
	Exercised		(25,512	)	$	18.76
	Forfeited		(363	)	$	55.18
	Outstanding at September 30, 2013		194,474		$	20.13

Earnings_per_Share_Tables

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of Computation of Basic and Diluted EPS	'
	The computation of basic and diluted EPS is as follows:
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013			2012		2013		2012
	($ in thousands, except per share amounts)
	Net Income	$	21,302		$	11,642	$	50,270	$	25,459
	Noncontrolling interests		(213	)		—		164		—
	Allocation of earnings to preferred stockholders		—			—		—		(64	)
	Net Income Attributable to Common Stockholders	$	21,089		$	11,642		50,434	$	25,395
	Shares (in thousands):
	Basic: Weighted-average number of shares outstanding		7,995			7,843		7,879		7,692
	Plus: Incremental shares from assumed conversion of dilutive instruments		232			274		246		363
	Diluted: Weighted-average number of shares outstanding		8,227			8,117		8,125		8,055
	Earnings per share - basic	$	2.64		$	1.48	$	6.4	$	3.3
	Earnings per share - diluted	$	2.56		$	1.43	$	6.21	$	3.15

Consolidation_of_Sponsored_Inv1

Consolidation of Sponsored Investment Products (Tables)	9 Months Ended
	Sep. 30, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Consolidated Statement of Balance Sheets	'
	The following tables reflect the impact of the consolidated sponsored investment products in the Condensed Consolidated Balance Sheets as of September 30, 2013 and December 31, 2012 respectively:
	As of September 30, 2013
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment Products			Products			Adjustments (a)			Condensed
												Consolidated
												Balance Sheet
	($ in thousands)
	Current assets		$	399,485		$	139,044	(1)	$	(77,391	)	$	461,138
	Non-current assets			140,496			—			—			140,496
	Total assets		$	539,981		$	139,044		$	(77,391	)	$	601,634
	Current liabilities		$	66,105		$	42,824		$	(26	)	$	108,903
	Non-current liabilities			8,072			—			—			8,072
	Total liabilities			74,177			42,824			(26	)		116,975
	Redeemable noncontrolling interest			—			—			18,855			18,855
	Equity attributable to stockholders of the Company			465,853			96,220			(96,220	)		465,853
	Non-redeemable noncontrolling interest			(49	)		—			—			(49	)
	Total liabilities and equity		$	539,981		$	139,044		$	(77,391	)	$	601,634
	As of December 31, 2012
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment Products			Products			Adjustments (a)			Consolidated
												Balance Sheet
	($ in thousands)
	Current assets		$	161,286		$	43,924		$	(40,384	)	$	164,826
	Non-current assets			167,923			—			—			167,923
	Total assets		$	329,209		$	43,924		$	(40,384	)	$	332,749
	Current liabilities		$	62,034		$	364		$	13		$	62,411
	Other non-current liabilities			22,704			—			—			22,704
	Total liabilities			84,738			364			13			85,115
	Redeemable noncontrolling interest			—			—			3,163			3,163
	Equity attributable to stockholders of the Company			244,474			43,560			(43,560	)		244,474
	Non-redeemable noncontrolling interest			(3	)		—			—			(3	)
	Total liabilities and equity		$	329,209		$	43,924		$	(40,384	)	$	332,749
	-1	Includes other current assets of $41.0 million related to unsettled fund share receivables of consolidated sponsored investment products at September 30, 2013.
Consolidated Statement of Operations	'
	The following table reflects the impact of the consolidated sponsored investment products in the Condensed Consolidated Statement of Operations for the three and nine months ended September 30, 2013 and 2012:
	For the Three Months Ended September 30, 2013
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
	($ in thousands)
	Total operating revenues		$	100,319		$	—		$	90		$	100,409
	Total operating expenses			68,547			142			90			68,779
	Operating income (loss)			31,772			(142	)		—			31,630
	Total other non-operating income (expense)			1,870			923			(554	)		2,239
	Income (loss) before income tax expense			33,642			781			(554	)		33,869
	Income tax expense			12,567			—			—			12,567
	Net income (loss)			21,075			781			(554	)		21,302
	Noncontrolling interests			14			—			(227	)		(213	)
	Net income (loss) attributable to the Company		$	21,089		$	781		$	(781	)	$	21,089
	For the Three Months Ended September 30, 2012
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
	($ in thousands)
	Total operating revenues		$	71,825		$	—		$	126		$	71,951
	Total operating expenses			54,030			28			126			54,184
	Operating income (loss)			17,795			(28	)		—			17,767
	Total other non-operating income (expense)			1,126			639			(611	)		1,154
	Income (loss) before income tax expense			18,921			611			(611	)		18,921
	Income tax expense			7,279			—			—			7,279
	Net income (loss)			11,642			611			(611	)		11,642
	Noncontrolling interests			—			—			—			—
	Net income (loss) attributable to the Company		$	11,642		$	611		$	(611	)	$	11,642
	For the Nine Months Ended September 30, 2013
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
	($ in thousands)
	Total operating revenues		$	282,575		$	—		$	142		$	282,717
	Total operating expenses			202,557			406			142			203,105
	Operating income (loss)			80,018			(406	)		—			79,612
	Total other non-operating income (expense)			705			(768	)		1,056			993
	Income (loss) before income tax expense			80,723			(1,174	)		1,056			80,605
	Income tax expense			30,335			—			—			30,335
	Net income (loss)			50,388			(1,174	)		1,056			50,270
	Noncontrolling interests			46			—			118			164
	Net income (loss) attributable to the Company		$	50,434		$	(1,174	)	$	1,174		$	50,434
	For the Nine Months Ended September 30, 2012
			Balance Before			Consolidated			Eliminations			Balances as
			Consolidation of			Investment			and			Reported in
			Investment			Products			Adjustments (a)			Condensed
			Products									Consolidated
												Statement of
												Operations
	Total operating revenues		$	201,041		$	—		$	126		$	201,167
	Total operating expenses			161,040			28			126			161,194
	Operating income (loss)			40,001			(28	)		—			39,973
	Total other non-operating income (expense)			1,938			639			(611	)		1,966
Income (loss) before income tax expense			41,939			611			(611	)		41,939
Income tax expense			16,480			—			—			16,480
Net income (loss)			25,459			611			(611	)		25,459
Allocation of earnings to preferred stockholders			(64	)		—			—			(64	)
Net income (loss) attributable to the Company		$	25,395		$	611		$	(611	)	$	25,395
(a)	Adjustments include the elimination of intercompany transactions between the Company and its consolidated sponsored investment products, primarily the elimination of the investments and equity and recording of any noncontrolling interest.

Intangible_Assets_Net_Summary_

Intangible Assets, Net - Summary of Intangible Assets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Definite-lived intangible assets:	'	'	'	'
Investment contracts	$162,358	$197,704	'	'
Accumulated amortization	-148,867	-181,409	'	'
Definite-lived intangible assets, net	13,491	16,295	'	'
Indefinite-lived intangible assets	32,416	32,416	'	'
Total intangible assets, net	$45,907	$48,711	$49,553	$52,096

Intangible_Assets_Net_Schedule

Intangible Assets, Net - Schedule of Activity in Intangible Assets (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Intangible assets, net	'	'
Intangible assets, net Balance, beginning of period	$48,711	$52,096
Purchases	356	350
Amortization	-3,160	-2,893
Intangible assets, net, ending balance	$45,907	$49,553

Equity_Method_Investment_in_Af2

Equity Method Investment in Affiliate - Additional Information (Detail)	Sep. 30, 2013	Dec. 31, 2012	Apr. 09, 2013	Apr. 09, 2013
	USD ($)	USD ($)	Kleinwort Benson Investors International, Ltd. [Member]	Kleinwort Benson Investors International, Ltd. [Member]
			USD ($)	EUR (€)
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Acquisition date	'	'	9-Apr-13	9-Apr-13
Percentage of noncontrolling equity interest acquired	'	'	24.00%	24.00%
Noncontrolling equity interest acquired, amount	'	'	$3,400,000	€ 2,600,000
Investment to goodwill	5,260,000	5,260,000	2,500,000	'
Definite-lived intangible assets,	'	'	600,000	'
Period of amortization of definite-lived intangible assets	'	'	'7 years	'7 years
Remaining assets and liabilities	'	'	$300,000	'

Marketable_Securities_Schedule

Marketable Securities - Schedule of Marketable Securities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule Of Available For Sale And Trading Securities [Line Items]	'	'
Fair Value	$95,998	$43,227
Cost	114,784	55,037
Unrealized Loss	-3,379	-891
Unrealized Gain	6,194	4,129
Fair Value	117,599	58,275
Sponsored mutual funds and variable insurance funds [Member]	'	'
Schedule Of Available For Sale And Trading Securities [Line Items]	'	'
Cost	11,845	7,312
Unrealized Loss	-685	-689
Unrealized Gain	2,653	1,390
Fair Value	13,813	8,013
Debt securities [Member]	'	'
Schedule Of Available For Sale And Trading Securities [Line Items]	'	'
Cost	29,598	24,830
Unrealized Loss	-2,154	-21
Unrealized Gain	165	1,003
Fair Value	27,609	25,812
Equity securities [Member]	'	'
Schedule Of Available For Sale And Trading Securities [Line Items]	'	'
Cost	3,898	3,739
Unrealized Gain	1,206	640
Fair Value	5,104	4,379
Cost	66,679	16,537
Unrealized Loss	-415	-144
Unrealized Gain	2,125	1,022
Fair Value	68,389	17,415
Sponsored closed-end funds [Member]	'	'
Schedule Of Available For Sale And Trading Securities [Line Items]	'	'
Cost	2,764	2,619
Unrealized Loss	-125	-37
Unrealized Gain	45	74
Fair Value	$2,684	$2,656

Fair_Value_Measurements_Change

Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Investments of consolidated sponsored investment products	$95,998	$43,227
Total assets measured at fair value	121,382	61,245
Sponsored mutual funds and variable insurance funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	13,813	8,013
Debt securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Investments of consolidated sponsored investment products	27,609	25,812
Equity securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	5,104	4,379
Investments of consolidated sponsored investment products	68,389	17,415
Sponsored closed-end funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities available for sale	2,684	2,656
Nonqualified retirement plan assets [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Other assets, nonqualified retirement plan assets	3,783	2,970
Level 1 [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Total assets measured at fair value	92,833	28,110
Level 1 [Member] | Sponsored mutual funds and variable insurance funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	13,813	8,013
Level 1 [Member] | Debt securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Investments of consolidated sponsored investment products	'	'
Level 1 [Member] | Equity securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	5,104	4,379
Investments of consolidated sponsored investment products	67,449	10,092
Level 1 [Member] | Sponsored closed-end funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities available for sale	2,684	2,656
Level 1 [Member] | Nonqualified retirement plan assets [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Other assets, nonqualified retirement plan assets	3,783	2,970
Level 2 [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Total assets measured at fair value	28,549	33,135
Level 2 [Member] | Sponsored mutual funds and variable insurance funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	'	'
Level 2 [Member] | Debt securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Investments of consolidated sponsored investment products	27,609	25,812
Level 2 [Member] | Equity securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	'	'
Investments of consolidated sponsored investment products	940	7,323
Level 2 [Member] | Sponsored closed-end funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities available for sale	'	'
Level 2 [Member] | Nonqualified retirement plan assets [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Other assets, nonqualified retirement plan assets	'	'
Level 3 [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Sponsored mutual funds and variable insurance funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	'	'
Level 3 [Member] | Debt securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Investments of consolidated sponsored investment products	'	'
Level 3 [Member] | Equity securities [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities trading	'	'
Investments of consolidated sponsored investment products	'	'
Level 3 [Member] | Sponsored closed-end funds [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Marketable securities available for sale	'	'
Level 3 [Member] | Nonqualified retirement plan assets [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Other assets, nonqualified retirement plan assets	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'
Fair Value, Equity, Level 2 to Level 1 Transfers, Amount	$5.20

Equity_Transactions_Additional

Equity Transactions - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	31-May-13	Dec. 31, 2012
Equity, Class of Treasury Stock [Line Items]	'	'	'	'
Common stock value	$191,581,000	'	'	'
Treasury stock, shares acquired	105,000	35,000	'	'
Weighted average purchase price per share	$187.61	$87.41	'	'
Total cost of treasury shares acquired	19,700,000	3,100,000	'	'
Treasury stock, shares	350,000	'	'	245,000
Treasury stock, at cost	37,438,000	'	'	17,734,000
Repurchased additional shares of common stock, shares	'	'	350,000	'
Common stock remaining authorized for repurchase	350,000	'	'	'
Repurchase program expiration date	21-May-16	'	'	'
Public Offering [Member]	'	'	'	'
Equity, Class of Treasury Stock [Line Items]	'	'	'	'
Common stock, shares issued	1,300,000	'	'	'
Common stock value	$191,600,000	'	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	($287)	'
Other comprehensive income (loss) before reclassifications, net of tax	-48	-89	91	-54
Other comprehensive income (loss) before reclassifications, foreign currency translation adjustments, net of tax	37	'	19	'
Other comprehensive (loss) income	-11	-89	110	-54
Ending Balance	-177	'	-177	'
Unrealized Gains and (Losses) on Securities Available-for-Sale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	-287	-14
Other comprehensive income (loss) before reclassifications, net of tax	'	'	91	-54
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Other comprehensive (loss) income	'	'	91	-54
Ending Balance	-196	-68	-196	-68
Foreign Currency Translation Adjustments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	'	'
Other comprehensive income (loss) before reclassifications, net of tax	'	'	'	'
Other comprehensive income (loss) before reclassifications, foreign currency translation adjustments, net of tax	'	'	19	'
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Other comprehensive (loss) income	'	'	19	'
Ending Balance	$19	'	$19	'

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income - Changes in Accumulated Other Comprehensive Income (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Other comprehensive income (loss) before reclassifications, tax	$29	$58	$207	$35
Other comprehensive income (loss) before reclassifications, tax	-23	'	-12	'
Unrealized Gains and (Losses) on Securities Available-for-Sale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Other comprehensive income (loss) before reclassifications, tax	'	'	207	35
Other comprehensive income (loss) before reclassifications, tax	'	'	'	'
Foreign Currency Translation Adjustments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Other comprehensive income (loss) before reclassifications, tax	'	'	($12)	'

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Dec. 31, 2012
					Maximum [Member]	Maximum [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'
Accounts payable, related parties	'	'	'	'	$0.10	$0.10
Distribution and administration expenses	$0.10	$0.40	$0.50	$1.80	'	'

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Shares of common stock available for issuance	496,694	'	496,694	'
Shares of common stock reserved for issuance	1,800,000	'	1,800,000	'
Vesting period of stock options in years	'	'	'3 years	'
Taxes paid related to net share settlement of restricted stock units	'	'	$7,493,000	$11,280,000
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Contractual life in years	'	'	'10 years	'
Recognized stock-based compensation expense	2,000,000	1,600,000	6,000,000	5,400,000
Unamortized stock-based compensation expense	100,000	'	100,000	'
Weighted-average remaining amortization period	'	'	'5 months	'
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Contractual life in years	'	'	'3 years	'
RSUs paid to settle tax withholding obligations	'	'	38,128	'
Taxes paid related to net share settlement of restricted stock units	'	'	7,500,000	'
Unamortized stock-based compensation expense	$11,200,000	'	$11,200,000	'
Weighted-average remaining amortization period	'	'	'1 year 2 months 12 days	'

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail) (Restricted Stock Units [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Restricted Stock Units [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares, Beginning Balance	292,057
Number of Shares, Granted	46,000
Number of Shares, Forfeited	-11,942
Number of Shares, Settled	-91,269
Number of Shares, Ending Balance	234,846
Weighted Average Grant Date Fair Value, Beginning Balance	$57.89
Weighted Average Grant Date Fair Value, Granted	$188.36
Weighted Average Grant Date Fair Value, Forfeited	$88
Weighted Average Grant Date Fair Value, Settled	$38.23
Weighted Average Grant Date Fair Value, Ending Balance	$88.26

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of Shares, Beginning Balance	220,349
Number of Shares, Exercised	-25,512
Number of Shares, Forfeited	-363
Number of Shares, Ending Balance	194,474
Weighted Average Exercise Price, Beginning Balance	$20.03
Weighted Average Exercise Price, Exercised	$18.76
Weighted Average Exercise Price, Forfeited	$55.18
Weighted Average Exercise Price, Ending Balance	$20.13

Earnings_per_Share_Schedule_of

Earnings per Share - Schedule of Computation of Basic and Diluted EPS (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Net Income	$21,302	$11,642	$50,270	$25,459
Noncontrolling interests	-213	'	164	'
Allocation of earnings to preferred stockholders	'	'	'	-64
Net Income Attributable to Common Stockholders	$21,089	$11,642	$50,434	$25,395
Shares (in thousands):	'	'	'	'
Basic: Weighted-average number of shares outstanding	7,995	7,843	7,879	7,692
Plus: Incremental shares from assumed conversion of dilutive instruments	232	274	246	363
Diluted: Weighted-average number of shares outstanding	8,227	8,117	8,125	8,055
Earnings per share - Basic	$2.64	$1.48	$6.40	$3.30
Earnings per share - Diluted	$2.56	$1.43	$6.21	$3.15

Earnings_per_Share_Additional_

Earnings per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]	'	'	'	'
Number of anti-dilutive instruments excluded from computation of weighted average shares for diluted EPS	3,115	0	3,115	0

Long_Term_Debt_Additional_Info

Long Term Debt - Additional Information (Detail) (USD $)	9 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
		Revolving Credit Facility [Member]
Debt Instrument [Line Items]	'	'
Repayment of debt	$15,000	$15,000
Available borrowing capacity	'	$75,000

Consolidation_of_Sponsored_Inv2

Consolidation of Sponsored Investment Products - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013
	Funds
Stockholders Equity Excluding Portion Attributable To Subsidiaries Noncontrolling Interest [Abstract]	'
Number of deconsolidated mutual funds	3
Number of additional consolidated mutual funds	3
Number of consolidated mutual funds	8

Consolidation_of_Sponsored_Inv3

Consolidation of Sponsored Investment Products - Consolidated Statement of Balance Sheets (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]	'	'	'
Current assets	$461,138	$164,826	'
Non-current assets	140,496	167,923	'
Total assets	601,634	332,749	'
Current liabilities	108,903	62,411	'
Non-current liabilities	8,072	22,704	'
Total liabilities	116,975	85,115	'
Redeemable noncontrolling interest	18,855	3,163	'
Equity attributable to stockholders of the Company	465,853	244,474	183,155
Non-redeemable noncontrolling interest	-49	-3	'
Total liabilities and equity	601,634	332,749	'
Reportable Legal Entities [Member] | Balance Before Consolidation of Investment Products [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Current assets	399,485	161,286	'
Non-current assets	140,496	167,923	'
Total assets	539,981	329,209	'
Current liabilities	66,105	62,034	'
Non-current liabilities	8,072	22,704	'
Total liabilities	74,177	84,738	'
Redeemable noncontrolling interest	'	'	'
Equity attributable to stockholders of the Company	465,853	244,474	'
Non-redeemable noncontrolling interest	-49	-3	'
Total liabilities and equity	539,981	329,209	'
Reportable Legal Entities [Member] | Consolidated Investment Products [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Current assets	139,044	43,924	'
Non-current assets	'	'	'
Total assets	139,044	43,924	'
Current liabilities	42,824	364	'
Non-current liabilities	'	'	'
Total liabilities	42,824	364	'
Redeemable noncontrolling interest	'	'	'
Equity attributable to stockholders of the Company	96,220	43,560	'
Non-redeemable noncontrolling interest	'	'	'
Total liabilities and equity	139,044	43,924	'
Consolidation, Eliminations [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Current assets	-77,391	-40,384	'
Non-current assets	'	'	'
Total assets	-77,391	-40,384	'
Current liabilities	-26	13	'
Non-current liabilities	'	'	'
Total liabilities	-26	13	'
Redeemable noncontrolling interest	18,855	3,163	'
Equity attributable to stockholders of the Company	-96,220	-43,560	'
Non-redeemable noncontrolling interest	'	'	'
Total liabilities and equity	($77,391)	($40,384)	'

Consolidation_of_Sponsored_Inv4

Consolidation of Sponsored Investment Products - Consolidated Statement of Balance Sheets (Parenthetical) (Detail) (Consolidated Investment Products [Member], Reportable Legal Entities [Member], USD $)	Sep. 30, 2013
In Millions, unless otherwise specified
Consolidated Investment Products [Member] | Reportable Legal Entities [Member]	'
Condensed Financial Statements, Captions [Line Items]	'
Other current assets of consolidated sponsored investment products	$41

Consolidation_of_Sponsored_Inv5

Consolidation of Sponsored Investment Products - Consolidated Statement of Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidating Financial Information [Line Items]	'	'	'	'
Total operating revenues	$100,409	$71,951	$282,717	$201,167
Total operating expenses	68,779	54,184	203,105	161,194
Operating income (loss)	31,630	17,767	79,612	39,973
Total other non-operating income (expense)	2,239	1,154	993	1,966
Income Before Income Taxes	33,869	18,921	80,605	41,939
Income tax expense	12,567	7,279	30,335	16,480
Net income (loss)	21,302	11,642	50,270	25,459
Noncontrolling interests	-213	'	164	'
Allocation of earnings to preferred stockholders	'	'	'	-64
Net Income Attributable to Common Stockholders	21,089	11,642	50,434	25,395
Reportable Legal Entities [Member] | Balance Before Consolidation of Investment Products [Member]	'	'	'	'
Condensed Consolidating Financial Information [Line Items]	'	'	'	'
Total operating revenues	100,319	71,825	282,575	201,041
Total operating expenses	68,547	54,030	202,557	161,040
Operating income (loss)	31,772	17,795	80,018	40,001
Total other non-operating income (expense)	1,870	1,126	705	1,938
Income Before Income Taxes	33,642	18,921	80,723	41,939
Income tax expense	12,567	7,279	30,335	16,480
Net income (loss)	21,075	11,642	50,388	25,459
Noncontrolling interests	14	'	46	'
Allocation of earnings to preferred stockholders	'	'	'	-64
Net Income Attributable to Common Stockholders	21,089	11,642	50,434	25,395
Reportable Legal Entities [Member] | Consolidated Investment Products [Member]	'	'	'	'
Condensed Consolidating Financial Information [Line Items]	'	'	'	'
Total operating revenues	'	'	'	'
Total operating expenses	142	28	406	28
Operating income (loss)	-142	-28	-406	-28
Total other non-operating income (expense)	923	639	-768	639
Income Before Income Taxes	781	611	-1,174	611
Income tax expense	'	'	'	'
Net income (loss)	781	611	-1,174	611
Noncontrolling interests	'	'	'	'
Allocation of earnings to preferred stockholders	'	'	'	'
Net Income Attributable to Common Stockholders	781	611	-1,174	611
Consolidation, Eliminations [Member]	'	'	'	'
Condensed Consolidating Financial Information [Line Items]	'	'	'	'
Total operating revenues	90	126	142	126
Total operating expenses	90	126	142	126
Operating income (loss)	'	'	'	'
Total other non-operating income (expense)	-554	-611	1,056	-611
Income Before Income Taxes	-554	-611	1,056	-611
Income tax expense	'	'	'	'
Net income (loss)	-554	-611	1,056	-611
Noncontrolling interests	-227	'	118	'
Allocation of earnings to preferred stockholders	'	'	'	'
Net Income Attributable to Common Stockholders	($781)	($611)	$1,174	($611)