WisdomTree (WT) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'WETF	'
Entity Registrant Name	'WisdomTree Investments, Inc.	'
Entity Central Index Key	'0000880631	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	133,492,949

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$151,287	$104,316
Accounts receivable	16,268	18,100
Other current assets	2,208	1,320
Total current assets	169,763	123,736
Fixed assets, net	10,263	6,252
Investments	12,224	11,748
Deferred tax asset, net	8,253	'
Goodwill	1,676	'
Other noncurrent assets	56	55
Total assets	202,235	141,791
Current liabilities:	'	'
Fund management and administration payable	8,833	10,394
Compensation and benefits payable	7,062	14,278
Accounts payable and other liabilities	4,956	4,384
Total current liabilities	20,851	29,056
Acquisition payable	1,757	'
Deferred rent payable	5,326	3,706
Total liabilities	27,934	32,762
Stockholders' equity:	'	'
Preferred stock, par value $0.01; 2,000 shares authorized	0	0
Common stock, par value $0.01; 250,000 shares authorized; issued: 133,516 and 132,247; outstanding: 131,947 and 130,350	1,335	1,322
Additional paid-in capital	198,040	184,201
Accumulated other comprehensive loss	-9	'
Accumulated deficit	-25,065	-76,494
Total stockholders' equity	174,301	109,029
Total liabilities and stockholders' equity	$202,235	$141,791

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	2,000	2,000
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	250,000	250,000
Common stock, shares issued	133,516	132,247
Common stock, shares outstanding	131,947	130,350

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:	'	'	'	'
Advisory fees	$46,942	$39,437	$133,489	$105,691
Other income	172	193	673	611
Total revenues	47,114	39,630	134,162	106,302
Expenses:	'	'	'	'
Compensation and benefits	9,990	9,648	26,896	26,577
Fund management and administration	8,465	8,794	25,451	26,123
Marketing and advertising	3,341	2,031	8,645	6,164
Sales and business development	1,279	1,305	4,307	4,626
Professional and consulting fees	1,383	542	5,018	1,812
Occupancy, communications, and equipment	882	723	2,635	1,691
Depreciation and amortization	207	84	600	249
Third-party sharing arrangements	187	374	312	913
Other	1,123	1,164	3,429	3,086
Total expenses	26,857	24,665	77,293	71,241
Income before taxes	20,257	14,965	56,869	35,061
Income tax	9,634	'	5,440	'
Net income	10,623	14,965	51,429	35,061
Net income per share-basic	$0.08	$0.12	$0.39	$0.28
Net income per share-diluted	$0.08	$0.11	$0.37	$0.25
Weighted-average common shares-basic	131,778	126,509	131,418	125,909
Weighted-average common shares-diluted	138,346	140,097	138,476	139,805
Other comprehensive income	'	'	'	'
Net income	10,623	14,965	51,429	35,061
Foreign currency translation adjustment	-9	'	-9	'
Comprehensive income	$10,614	$14,965	$51,420	$35,061

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net income	$51,429	$35,061
Non-cash items included in net income:	'	'
Income tax	5,396	'
Depreciation and amortization	600	249
Stock-based compensation	6,122	5,186
Deferred rent	1,620	111
Accretion to interest income and other	-76	108
Changes in operating assets and liabilities:	'	'
Accounts receivable	2,049	-3,683
Other assets	-811	-720
Fund management and administration payable	-1,579	3,697
Compensation and benefits payable	-7,510	7,235
Accounts payable and other liabilities	-590	471
Net cash provided by operating activities	56,650	47,715
Cash flows from investing activities:	'	'
Purchase of fixed assets	-4,580	-1,118
Purchase of investments	-1,384	-3,358
Cash acquired on acquisition	1,349	'
Proceeds from the redemption of investments	868	2,693
Net cash used in investing activities	-3,747	-1,783
Cash flows from financing activities:	'	'
Shares repurchased	-6,259	-1,413
Proceeds from exercise of stock options	341	1,349
Net cash used in financing activities	-5,918	-64
Decrease in cash flows due to changes in foreign exchange rate	-14	'
Net increase in cash and cash equivalents	46,971	45,868
Cash and cash equivalents-beginning of period	104,316	41,246
Cash and cash equivalents-end of period	151,287	87,114
Supplemental disclosure of cash flow information:	'	'
Cash paid for taxes	$66	$33

Organization_and_Description_o

Organization and Description of Business	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Organization and Description of Business	'
	1	Organization and Description of Business
	WisdomTree Investments, Inc., through its subsidiaries in the U.S., U.K., Jersey and Ireland (collectively, “WisdomTree” or the “Company”), is an ETP sponsor and asset manager headquartered in New York. WisdomTree offers ETPs covering equity, fixed income, currency, alternative and commodity asset classes. The Company has the following operating subsidiaries:
		•	WisdomTree Asset Management, Inc. (“WTAM”) is a New York based investment adviser registered with the SEC providing investment advisory and other management services to WisdomTree Trust (“WTT”) and WisdomTree exchange traded funds (“ETFs”).
		•	Boost Management Limited (“BML” or “Boost”) is a Jersey based investment manager providing investment and other management services to Boost Issuer PLC (“BI”) and Boost ETPs.
		•	WisdomTree Europe Limited (“WisdomTree Europe”) is a U.K. based company registered with the Financial Conduct Authority providing management and other services to BML and WTML.
		•	WisdomTree Management Limited (“WTML”) is an Ireland based investment manager providing investment and other management services to WisdomTree Issuer PLC (“WTI”) and WisdomTree UCITS ETFs.
	The WisdomTree ETFs are issued in the U.S. by WTT. WTT, a non-consolidated third party, is a Delaware statutory trust registered with the SEC as an open-end management investment company. The Company has licensed the use of certain of its own indexes on an exclusive basis in the U.S. to WTT for the WisdomTree ETFs. The Boost ETPs are issued by BI. BI, a non-consolidated third party, is a public limited company organized in Ireland. The WisdomTree UCITS ETFs are issued by WTI. WTI, a non-consolidated third party, is a public limited company organized in Ireland.
	The Board of Trustees and Board of Directors of WTT, BI and WTI, respectively, are separate from the Board of Directors of the Company. The Trustees and Directors of WTT, BI and WTI respectively, are primarily responsible for overseeing the management and affairs of the WisdomTree ETFs, Boost ETPs and the WisdomTree UCITS ETFs for the benefit of the WisdomTree ETF, Boost ETP and the WisdomTree UCITS ETF shareholders, respectively, and have contracted with the Company to provide for general management and administration services. The Company, in turn, has contracted with third parties to provide the majority of these administration services. In addition, certain officers of the Company provide general management services for WTT, BI and WTI.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2	Significant Accounting Policies
	Basis of Presentation
	These consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and in the opinion of management reflect all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of financial condition, results of operations, and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company’s wholly owned subsidiaries.
	All intercompany accounts and transactions have been eliminated in consolidation. Certain accounts in the prior years’ consolidated financial statements have been reclassified to conform to the current year’s consolidated financial statements presentation. These reclassifications had no effect on the previously reported operating results.
	Foreign Currency Translation
	Assets and liabilities of subsidiaries whose functional currency is not the U.S. dollar are translated based on the end of period exchange rates from local currency to U.S. dollars. Results of operations are translated at the average exchange rates in effect during the period.
	Use of Estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Actual results could differ materially from those estimates.
	Revenue Recognition
	The Company earns investment advisory fees as well as licensing fees from third parties. Advisory fees are based on a percentage of the ETPs average daily net assets and recognized over the period the related service is provided. Licensing fees are based on a percentage of the average monthly net assets and recognized over the period the related service is provided.
	Depreciation and Amortization
	Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows:
	Equipment		5 years
	Furniture and fixtures		15 years
	Leasehold improvements are amortized over the term of their respective leases or service lives of the improvements, whichever is shorter. Fixed assets are stated at cost less accumulated depreciation and amortization.
	Marketing and Advertising
	Advertising costs, including media advertising and production costs are expensed when incurred.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be classified as cash equivalents. Cash and cash equivalents are held primarily with one large financial institution.
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are customer and other obligations due under normal trade terms. An allowance for doubtful accounts is not provided since, in the opinion of management, all accounts receivable recorded are deemed collectible.
	Impairment of Long-Lived Assets
	On a periodic basis, the Company performs a review for the impairment of long-lived assets when events or changes in circumstances indicate that the estimated undiscounted future cash flows expected to be generated by the assets are less than their carrying amounts or when other events occur which may indicate that the carrying amount of an asset may not be recoverable.
	Earnings per Share
	Basic earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the reduction in earnings per share assuming options or other contracts to issue common stock were exercised or converted into common stock.
	Investments
	The Company accounts for all of its investments as held-to-maturity, which are recorded at amortized cost. For held-to-maturity investments, the Company has the intent and ability to hold investments to maturity and it is not more-likely-than-not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity.
	On a periodic basis, the Company reviews its portfolio of investments for impairment. If a decline in fair value is deemed to be other-than-temporary, the security is written down to its fair value through earnings.
	Goodwill
	Goodwill is the excess of the fair value of the purchase price over the fair values of the identifiable net assets at the acquisition date. The Company tests its goodwill for impairment at least annually. An impairment loss is triggered if the estimated fair value of the operating reporting unit is less than the estimated net book value. Such loss is calculated as the difference between the estimated fair value of goodwill and its carrying value.
	Stock-Based Awards
	Accounting for stock-based compensation requires the measurement and recognition of compensation expense for all equity awards based on estimated fair values. The Company accounts for stock-based compensation for its employees based on the cost of employee services received in exchange for a stock-based award. Stock-based compensation is measured based on the grant-date fair value of the award and are amortized over the relevant service period.
	Stock-based awards granted to non-employees for goods or services are valued at the fair value of the equity instruments issued or the fair value of consideration received, whichever is a more reliable measure of the fair value of the transaction, and recognized when performance obligations are complete.
	Income Taxes
	The Company accounts for income taxes using the liability method, which requires the determination of deferred tax assets and liabilities based on the differences between the financial and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which differences are expected to reverse. Deferred tax assets are adjusted by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized.
	In order to recognize and measure any unrecognized tax benefits, management evaluates and determines whether any of its tax positions are more-likely-than-not to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Once it is determined that a position meets this recognition threshold, the position is measured to determine the amount of benefit to be recognized in the consolidated financial statements.
	The Company records interest expense and penalties related to tax expenses as income tax expense.
	Related Party Transactions
	The Company’s primary revenues and the majority of its expenses are associated with providing investment advisory services to WTT and WisdomTree ETFs. The Trustees of WTT are primarily responsible for overseeing the management and affairs of the WisdomTree ETFs and WTT for the benefit of the WisdomTree ETF shareholders and WTT has contracted with the Company to provide for general management and administration of WTT and the WisdomTree ETFs. Certain officers of the Company also provide general management oversight of WTT; however, these officers have no material decision making responsibilities and primarily implement the decisions of the Trustees of WTT. The Company has granted WTT an exclusive license to certain of its indexes for operation of the WisdomTree ETFs and is also responsible for certain expenses of WTT, including the cost of transfer agency, custody, fund administration and accounting, legal, audit, and other non-distribution services, excluding extraordinary expenses, taxes and certain other expenses. In exchange, the Company receives fees based on a percentage of the ETF average daily net assets. The advisory agreements may be terminated by WTT upon notice. At September 30, 2014 and December 31, 2013, the balance of accounts receivable from WTT was approximately $15,471 and $14,791, respectively, which are included as a component of accounts receivable on the Company’s Consolidated Balance Sheet. Revenue from advisory services provided to WTT for the three months ended September 30, 2014 and 2013 was approximately $46,660 and $39,437, respectively, and for the nine months ended September 30, 2014 and 2013 was approximately $133,022 and $105,691, respectively.
	Revenue from advisory fee services provided to BI for three months ended September 30, 2014 was approximately $282 and for the period from April 15, 2014 to September 30, 2014 was approximately $467.
	Third Party Sharing Arrangements
	Third party sharing arrangements expense consists of payments for marketing agreements with third parties.
	Segment, Geographic and Customer Information
	The Company operates as a single business segment as an ETP sponsor and asset manager providing investment advisory services. As of and for the three and nine months ended September 30, 2014, substantially all of the Company’s revenues, pretax income and assets are derived or located in the U.S. The Company maintains operations in Europe through its acquisition of Boost, now known as WisdomTree Europe (Note 10).
	Recently Issued Accounting Pronouncements
	In May 2014, the FASB issued Accounting Standards Update 2014-09 (ASU 2014-09) Revenue from Contracts with Customers, which is a new comprehensive revenue recognition standard on the financial reporting requirements for revenue from contracts entered into with customers. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the potential impact of the adoption of this guidance on its consolidated financial statements.
	Business Combinations
	The Company includes the results of operations of the businesses that it acquires from the respective dates of acquisition. The fair values of the purchase price of the acquisitions are allocated to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill.
	Subsequent Events
	The Company has evaluated subsequent events after the date of the consolidated financial statements to consider whether or not the impact of such events needed to be reflected or disclosed in the consolidated financial statements. Such evaluation was performed through the issuance date of the consolidated financial statements.

Investments_and_Fair_Value_Mea

Investments and Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Investments and Fair Value Measurements	'
	3	Investments and Fair Value Measurements
	The following table summarizes the Company’s held-to-maturity investments:
			September 30, 2014			December 31, 2013
	Federal agency debt instruments		$	12,224		$	11,748
	The following table summarizes unrealized gains, losses, and fair value of held-to-maturity investments:
			September 30, 2014			December 31, 2013
	Cost/amortized cost		$	12,224		$	11,748
	Gross unrealized gains			80			20
	Gross unrealized losses			(650	)		(1,459	)
	Fair value		$	11,654		$	10,309
	The following table sets forth the maturity profile of held-to-maturity investments; however, these investments may be called prior to their stated maturity date:
			September 30, 2014			December 31, 2013
	Due within one year		$	—		$	—
	Due one year through five years			—			—
	Due five years through ten years			665			686
	Due over ten years			11,559			11,062
	Total		$	12,224		$	11,748
	Fair Value Measurement
	Under the accounting for fair value measurements and disclosures, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability, or the exit price, in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a hierarchy of valuation techniques based on whether the inputs to those valuation techniques are observable or unobservable. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions.
	These three types of inputs create the following fair value hierarchy:
	Level 1—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 whose inputs are observable or whose significant value drivers are observable.
	Level 3—Instruments whose significant value drivers are unobservable.
	This hierarchy requires the use of observable market data when available. The Company’s held-to-maturity securities are categorized as Level 1. The Company does not intend to sell its held-to-maturity investments before the recovery of their amortized cost bases which may be at maturity. Some of our financial instruments are not measured at fair value on a recurring basis but are recorded at amounts that approximate fair value due to their liquid or short-term nature. Such financial assets and financial liabilities are categorized as Level 3.

Fixed_Assets

Fixed Assets	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Fixed Assets	'
	4	Fixed Assets
	The following table summarizes fixed assets:
			September 30, 2014			December 31, 2013
	Equipment		$	850		$	518
	Furniture and fixtures			1,618			1,005
	Leasehold improvements			8,546			4,880
	Less accumulated depreciation and amortization			(751	)		(151	)
	Total		$	10,263		$	6,252

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	5	Commitments and Contingencies
	Contractual Obligations
	The Company has entered into obligations under operating leases with initial non-cancelable terms in excess of one year for office space, telephone, and data services. Expenses recorded under these agreements for the three months ended September 30, 2014 and 2013 were approximately $778, and $582, respectively, and for the nine months ended September 30, 2014 and 2013 were approximately $2,372 and $1,312, respectively.
	Future minimum lease payments with respect to non-cancelable operating leases at September 30, 2014 are approximately as follows:
	Remainder of 2014		$	809
	2015			3,054
	2016			2,840
	2017 and thereafter			35,126
	Total		$	41,829
	The Company’s prior office lease expired in January 2014. In August 2013, the Company entered into a new 16 year lease agreement. Pursuant to the new lease agreement, the Company received lease incentives which include a deferred rent period and a leasehold improvement allowance equal to $3,223. The Company recorded a receivable of $3,223 due from the lessor of its new office space related to its leasehold improvement allowance, which was included in accounts receivable on the Company’s Consolidated Balance Sheet at December 31, 2013. The balance at September 30, 2014 was $509.
	Letter of Credit
	The Company collateralized its office lease through a standby letter of credit. At September 30, 2014 and December 31, 2013, the Company provided letters of credit totaling $1,384 and $1,803, respectively, which are included in investments on the Company’s Consolidated Balance Sheet.
	Contingencies
	The Company is subject to various routine reviews and inspections by regulatory authorities as well as legal proceedings arising in the ordinary course of business. The Company is not currently party to any litigation or other legal proceedings that are expected to have a material impact on its business, financial position or results of operations.

StockBased_Awards

Stock-Based Awards	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Awards	'
	6	Stock-Based Awards
	The Company grants equity awards to employees and directors. Options are issued generally for terms of ten years and vest between two to four years. Options are issued with an exercise price equal to the fair value of the Company on the date of grant. The Company estimated the fair value for options using the Black-Scholes option pricing model. All restricted stock and option awards require future service as a condition of vesting with certain awards subject to acceleration under certain conditions. Restricted stock awards generally vest over three years.
	A summary of options and restricted stock activity is as follows:
			Options				Weighted				Restricted
							Average				Stock
							Exercise Price				Awards
							of Options
	Balance at January 1, 2014			7,844,691			$	1.29				1,896,877
	Granted			—			$	—				623,088
	Exercised/vested			(1,042,422	)		$	0.33				(946,385	)
	Forfeitures			—			$	—				(3,662	)
	Balance at September 30, 2014			6,802,269			$	1.44				1,569,918
	A summary of stock-based compensation expense is as follows:
	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2014				2013				2014				2013
	$	2,077			$	1,781			$	6,122			$	5,186

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	7	Employee Benefit Plans
	The Company has a 401(k) savings plan covering all eligible employees in which the Company can make discretionary contributions from its profits.
	A summary of the Company made discretionary contributions is as follows:
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
	$	113	$	128	$	506	$	391

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	8	Earnings Per Share
	The following is a reconciliation of the basic and diluted earnings per share computation:
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
			(shares in thousands)				(shares in thousands)
	Net income		$	10,623	$	14,965	$	51,429	$	35,061
	Shares of common stock and common stock equivalents:
	Weighted averages shares used in basic computation			131,778		126,509		131,418		125,909
	Dilutive effect of stock options and unvested restricted stock			6,568		13,588		7,058		13,896
	Weighted averages shares used in dilutive computation			138,346		140,097		138,476		139,805
	Basic earnings per share		$	0.08	$	0.12	$	0.39	$	0.28
	Dilutive earnings per share		$	0.08	$	0.11	$	0.37	$	0.25
	Diluted earnings per share reflects the reduction in earnings per share assuming options or other contracts to issue common stock were exercised or converted into common stock under the treasury stock method. The dilutive effect of options to purchase shares of common stock and restricted shares were included in the diluted earnings per share in the three and nine months ended September 30, 2014 and 2013, respectively. 624,478 and 1,196,888 restricted shares were determined to be anti-dilutive and were not included in the calculation of diluted earnings per share for the three and nine months ended September 30, 2014, respectively. There were no anti-dilutive shares included in the calculation of diluted earnings per share for the three and nine months ended September 30, 2013.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	9	Income Taxes
	Net operating losses – U.S.
	The Company generated net operating losses in the U.S. (“NOLs”) during periods prior to September 30, 2014. The following table summarizes the activity for NOLs for the nine months ended September 30, 2014:
	December 31, 2013		$	(140,959	)
	U.S. GAAP pretax income			59,142
	Income tax differences:
	Temporary			627
	Permanent			(20,507	)
	September 30, 2014		$	(101,697	)
	During the first quarter of 2014, management determined that although realization is not assured, it believed that it is more likely than not that its gross deferred tax asset would be realized. Therefore, it released the valuation allowance previously recorded resulting in an income tax benefit of $13,725 on the Company’s Consolidated Statements of Operations and Comprehensive Income in the three months ended March 31, 2014 and a corresponding deferred tax asset on the Company’s Consolidated Balance Sheet at March 31, 2014.
	At September 30, 2014 and December 31, 2013, $98,210 and $111,635 of the NOLs were generated from stock-based compensation amounts recognized for tax purposes at the time options are exercised (at the intrinsic value) or restricted stock is vested (at fair value of the share price) in excess of amounts previously expensed at the date of grant for U.S. GAAP purposes. These amounts cannot be recognized as a deferred tax asset under U.S. GAAP. In addition, $3,487 of the NOLs are deemed worthless. Therefore, at September 30, 2014, the Company has no recognized deferred tax assets related to these NOLs.
	During the three and nine months ended September 30, 2014, the Company recognized tax expense of $9,634 and $5,440. During the nine months ended September 30, 2014, the Company utilized $5,472 of its deferred tax asset and the Company recorded a credit to additional paid-in capital of $13,649 for the amount of NOLs from stock-based compensation utilized to reduce taxes payable during the period.
	The Company completed a state tax study which resulted in a reduction of its current baseline operating tax rate in the U.S. from 45% to approximately 38%. The Company reduced the carrying value of its deferred tax asset which had previously been recorded using the higher rate.
	A summary of the components of the gross and tax affected deferred tax asset as of September 30, 2014 is as follows:
	Stock-based compensation		$	15,689
	Deferred rent liability			5,703
	Other			111
	Total gross deferred tax asset			21,503
	Income tax rate			38.38	%
	Tax affected		$	8,253
	Net operating losses – Non-U.S.
	During the nine months ended September 30, 2014, the Company’s foreign subsidiaries generated $2,318 of NOLs. At September 30, 2014, a deferred tax asset related to these NOLs has been fully offset by a valuation allowance of $487.

Acquisition_and_Goodwill

Acquisition and Goodwill	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisition and Goodwill	'
	10	Acquisition and Goodwill
	On April 15, 2014, the Company completed its acquisition of Boost, a U.K. and Jersey based ETP sponsor, now known as WisdomTree Europe, as part of the Company’s strategy to expand internationally. Under the terms of the agreement, the Company owns 75% of WisdomTree Europe and the former Boost shareholders own 25%. The Company will acquire the remaining 25% ownership interest at the end of four years using a predefined formula based on European assets under management at the end of the four year period and will be tied to the Company’s enterprise value over global AUM at the time of payout, and affected by profitability of the European business. No consideration was transferred on the acquisition date. The ultimate payout will be made in cash over two years.
	Two shareholders of Boost, who owned 88% of Boost prior to the acquisition, became co-CEOs of WisdomTree Europe and are guaranteed a minimum payment of $1,757 for their interest if they terminate their employment without good reason or they are terminated for cause. The Company determined that this minimum payment represents consideration transferred and was recognized and measured at acquisition-date fair value to determine the purchase price. Any future payments made to the co-CEOs in excess of the minimum payments is accounted for separately from the business combination as compensation expense for post-acquisition services.
	Because the Company is required to redeem the shares from the former Boost shareholders at the end of four years under a predefined formula, under U.S. GAAP, the Company does not reflect the 25% interest held by the former Boost shareholders in WisdomTree Europe as non-controlling interest (“NCI”). The obligation to mandatorily redeem the NCI for cash was measured at fair value on the acquisition date and is re-measured at the amount of cash that would be paid under the conditions specified in the contract as if settlement occurred at the reporting date. Any change in the carrying amount of the liability will be recognized as an expense.
	The Company recorded goodwill of $1,676 in connection with this acquisition. Goodwill represents the excess value of the purchase price over the $81 fair value of the net assets acquired, consisting primarily of accounts receivable, accounts payable and fixed assets. While the Company paid no consideration up front to the former Boost shareholders, under the terms of the acquisition agreement, $1,757 was deemed to represent the purchase price. Goodwill is not expected to be tax deductible.
	The following table summarizes the goodwill activity for the nine months ended September 30, 2014:
	Balance at January 1, 2014		$	—
	Goodwill acquired during the period			1,676
	Balance at September 30, 2014		$	1,676
	Transaction costs of $1,607 were incurred during the nine months ended September 30, 2014 in connection with this acquisition. Such expenses are recorded in professional and consulting fees, other and sales and business development in the Company’s Consolidated Statements of Operations and Comprehensive Income.

Shares_Repurchased

Shares Repurchased	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Shares Repurchased	'
	11	Shares Repurchased
	During the nine months ended September 30, 2014 and 2013, the Company repurchased 392,346 and 118,156 shares of its common stock for an aggregate cost of $6,259 and $1,413, respectively, which were withheld pursuant to the terms of awards granted to employees to cover income tax withholding obligations.

Subsequent_Event

Subsequent Event	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Event	'
	12	Subsequent Event
	On October 29, 2014, the Company’s Board of Directors declared a quarterly cash dividend of $0.08 per share of common stock. The first dividend will be paid on November 26, 2014 to stockholders of record as of the close of business on November 12, 2014. The Board also authorized the purchase of up to $100 million of the Company’s common stock over three years, including purchases to offset future equity grants made under the Company’s equity plans. Purchases under this program will be made in open market or privately negotiated transactions. This authority may be exercised from time to time and in such amounts as market conditions warrant, and subject to regulatory considerations. The timing and actual number of shares repurchased will depend on a variety of factors including price, corporate and regulatory requirements, market conditions, and other corporate liquidity requirements and priorities. The repurchase program may be suspended or terminated at any time without prior notice.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	These consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and in the opinion of management reflect all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of financial condition, results of operations, and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company’s wholly owned subsidiaries.
	All intercompany accounts and transactions have been eliminated in consolidation. Certain accounts in the prior years’ consolidated financial statements have been reclassified to conform to the current year’s consolidated financial statements presentation. These reclassifications had no effect on the previously reported operating results.
Foreign Currency Translation	'
	Foreign Currency Translation
	Assets and liabilities of subsidiaries whose functional currency is not the U.S. dollar are translated based on the end of period exchange rates from local currency to U.S. dollars. Results of operations are translated at the average exchange rates in effect during the period.
Use of Estimates	'
	Use of Estimates
	The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Actual results could differ materially from those estimates.
Revenue Recognition	'
	Revenue Recognition
	The Company earns investment advisory fees as well as licensing fees from third parties. Advisory fees are based on a percentage of the ETPs average daily net assets and recognized over the period the related service is provided. Licensing fees are based on a percentage of the average monthly net assets and recognized over the period the related service is provided.
Depreciation and Amortization	'
	Depreciation and Amortization
	Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows:
	Equipment	5 years
	Furniture and fixtures	15 years
	Leasehold improvements are amortized over the term of their respective leases or service lives of the improvements, whichever is shorter. Fixed assets are stated at cost less accumulated depreciation and amortization.
Marketing and Advertising	'
	Marketing and Advertising
	Advertising costs, including media advertising and production costs are expensed when incurred.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be classified as cash equivalents. Cash and cash equivalents are held primarily with one large financial institution.
Accounts Receivable and Allowance for Doubtful Accounts	'
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are customer and other obligations due under normal trade terms. An allowance for doubtful accounts is not provided since, in the opinion of management, all accounts receivable recorded are deemed collectible.
Impairment of Long-Lived Assets	'
	Impairment of Long-Lived Assets
	On a periodic basis, the Company performs a review for the impairment of long-lived assets when events or changes in circumstances indicate that the estimated undiscounted future cash flows expected to be generated by the assets are less than their carrying amounts or when other events occur which may indicate that the carrying amount of an asset may not be recoverable.
Earnings per Share	'
	Earnings per Share
	Basic earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted earnings per share reflects the reduction in earnings per share assuming options or other contracts to issue common stock were exercised or converted into common stock.
Investments	'
	Investments
	The Company accounts for all of its investments as held-to-maturity, which are recorded at amortized cost. For held-to-maturity investments, the Company has the intent and ability to hold investments to maturity and it is not more-likely-than-not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity.
	On a periodic basis, the Company reviews its portfolio of investments for impairment. If a decline in fair value is deemed to be other-than-temporary, the security is written down to its fair value through earnings.
Goodwill	'
	Goodwill
	Goodwill is the excess of the fair value of the purchase price over the fair values of the identifiable net assets at the acquisition date. The Company tests its goodwill for impairment at least annually. An impairment loss is triggered if the estimated fair value of the operating reporting unit is less than the estimated net book value. Such loss is calculated as the difference between the estimated fair value of goodwill and its carrying value.
Stock-Based Awards	'
	Stock-Based Awards
	Accounting for stock-based compensation requires the measurement and recognition of compensation expense for all equity awards based on estimated fair values. The Company accounts for stock-based compensation for its employees based on the cost of employee services received in exchange for a stock-based award. Stock-based compensation is measured based on the grant-date fair value of the award and are amortized over the relevant service period.
	Stock-based awards granted to non-employees for goods or services are valued at the fair value of the equity instruments issued or the fair value of consideration received, whichever is a more reliable measure of the fair value of the transaction, and recognized when performance obligations are complete.
Income Taxes	'
	Income Taxes
	The Company accounts for income taxes using the liability method, which requires the determination of deferred tax assets and liabilities based on the differences between the financial and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which differences are expected to reverse. Deferred tax assets are adjusted by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not that some portion or all of the deferred tax assets will not be realized.
	In order to recognize and measure any unrecognized tax benefits, management evaluates and determines whether any of its tax positions are more-likely-than-not to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. Once it is determined that a position meets this recognition threshold, the position is measured to determine the amount of benefit to be recognized in the consolidated financial statements.
	The Company records interest expense and penalties related to tax expenses as income tax expense.
Related Party Transactions	'
	Related Party Transactions
	The Company’s primary revenues and the majority of its expenses are associated with providing investment advisory services to WTT and WisdomTree ETFs. The Trustees of WTT are primarily responsible for overseeing the management and affairs of the WisdomTree ETFs and WTT for the benefit of the WisdomTree ETF shareholders and WTT has contracted with the Company to provide for general management and administration of WTT and the WisdomTree ETFs. Certain officers of the Company also provide general management oversight of WTT; however, these officers have no material decision making responsibilities and primarily implement the decisions of the Trustees of WTT. The Company has granted WTT an exclusive license to certain of its indexes for operation of the WisdomTree ETFs and is also responsible for certain expenses of WTT, including the cost of transfer agency, custody, fund administration and accounting, legal, audit, and other non-distribution services, excluding extraordinary expenses, taxes and certain other expenses. In exchange, the Company receives fees based on a percentage of the ETF average daily net assets. The advisory agreements may be terminated by WTT upon notice. At September 30, 2014 and December 31, 2013, the balance of accounts receivable from WTT was approximately $15,471 and $14,791, respectively, which are included as a component of accounts receivable on the Company’s Consolidated Balance Sheet. Revenue from advisory services provided to WTT for the three months ended September 30, 2014 and 2013 was approximately $46,660 and $39,437, respectively, and for the nine months ended September 30, 2014 and 2013 was approximately $133,022 and $105,691, respectively.
	Revenue from advisory fee services provided to BI for three months ended September 30, 2014 was approximately $282 and for the period from April 15, 2014 to September 30, 2014 was approximately $467.
Third Party Sharing Arrangements	'
	Third Party Sharing Arrangements
	Third party sharing arrangements expense consists of payments for marketing agreements with third parties.
Segment, Geographic and Customer Information	'
	Segment, Geographic and Customer Information
	The Company operates as a single business segment as an ETP sponsor and asset manager providing investment advisory services. As of and for the three and nine months ended September 30, 2014, substantially all of the Company’s revenues, pretax income and assets are derived or located in the U.S. The Company maintains operations in Europe through its acquisition of Boost, now known as WisdomTree Europe (Note 10).
Recently Issued Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements
	In May 2014, the FASB issued Accounting Standards Update 2014-09 (ASU 2014-09) Revenue from Contracts with Customers, which is a new comprehensive revenue recognition standard on the financial reporting requirements for revenue from contracts entered into with customers. ASU 2014-09 is effective for interim and annual periods beginning after December 15, 2016. The Company is currently assessing the potential impact of the adoption of this guidance on its consolidated financial statements.
Business Combinations	'
	Business Combinations
	The Company includes the results of operations of the businesses that it acquires from the respective dates of acquisition. The fair values of the purchase price of the acquisitions are allocated to the assets acquired and liabilities assumed based on their estimated fair values. The excess of the fair value of purchase price over the fair values of these identifiable assets and liabilities is recorded as goodwill.
Subsequent Events	'
	Subsequent Events
	The Company has evaluated subsequent events after the date of the consolidated financial statements to consider whether or not the impact of such events needed to be reflected or disclosed in the consolidated financial statements. Such evaluation was performed through the issuance date of the consolidated financial statements.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Schedule of Estimated Useful Lives of Related Assets	'
	Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows:
	Equipment	5 years
	Furniture and fixtures	15 years

Investments_and_Fair_Value_Mea1

Investments and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Schedule of Held-to-maturity Investments	'
	The following table summarizes the Company’s held-to-maturity investments:
		September 30, 2014			December 31, 2013
	Federal agency debt instruments	$	12,224		$	11,748
Schedule of Unrealized Gains, Losses, and Fair Value of Held-to-maturity Investments	'
	The following table summarizes unrealized gains, losses, and fair value of held-to-maturity investments:
		September 30, 2014			December 31, 2013
	Cost/amortized cost	$	12,224		$	11,748
	Gross unrealized gains		80			20
	Gross unrealized losses		(650	)		(1,459	)
	Fair value	$	11,654		$	10,309
Schedule of Maturity Profile of Held-to-maturity Investments	'
	The following table sets forth the maturity profile of held-to-maturity investments; however, these investments may be called prior to their stated maturity date:
		September 30, 2014			December 31, 2013
	Due within one year	$	—		$	—
	Due one year through five years		—			—
	Due five years through ten years		665			686
	Due over ten years		11,559			11,062
	Total	$	12,224		$	11,748

Fixed_Assets_Tables

Fixed Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of Fixed Assets	'
	The following table summarizes fixed assets:
		September 30, 2014			December 31, 2013
	Equipment	$	850		$	518
	Furniture and fixtures		1,618			1,005
	Leasehold improvements		8,546			4,880
	Less accumulated depreciation and amortization		(751	)		(151	)
	Total	$	10,263		$	6,252

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Future Minimum Lease Payments	'
	Future minimum lease payments with respect to non-cancelable operating leases at September 30, 2014 are approximately as follows:
	Remainder of 2014	$	809
	2015		3,054
	2016		2,840
	2017 and thereafter		35,126
	Total	$	41,829

StockBased_Awards_Tables

Stock-Based Awards (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Options and Restricted Stock Activity	'
	A summary of options and restricted stock activity is as follows:
			Options				Weighted				Restricted
							Average				Stock
							Exercise Price				Awards
							of Options
	Balance at January 1, 2014			7,844,691			$	1.29				1,896,877
	Granted			—			$	—				623,088
	Exercised/vested			(1,042,422	)		$	0.33				(946,385	)
	Forfeitures			—			$	—				(3,662	)
	Balance at September 30, 2014			6,802,269			$	1.44				1,569,918
Summary of Stock-Based Compensation Expense	'
	A summary of stock-based compensation expense is as follows:
	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2014				2013				2014				2013
	$	2,077			$	1,781			$	6,122			$	5,186

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Summary of Discretionary Contributions	'
	A summary of the Company made discretionary contributions is as follows:
	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2014		2013		2014		2013
	$	113	$	128	$	506	$	391

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Reconciliation of Basic and Diluted Earnings Per Share	'
	The following is a reconciliation of the basic and diluted earnings per share computation:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(shares in thousands)				(shares in thousands)
	Net income	$	10,623	$	14,965	$	51,429	$	35,061
	Shares of common stock and common stock equivalents:
	Weighted averages shares used in basic computation		131,778		126,509		131,418		125,909
	Dilutive effect of stock options and unvested restricted stock		6,568		13,588		7,058		13,896
	Weighted averages shares used in dilutive computation		138,346		140,097		138,476		139,805
	Basic earnings per share	$	0.08	$	0.12	$	0.39	$	0.28
	Dilutive earnings per share	$	0.08	$	0.11	$	0.37	$	0.25

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Schedule of Net Operating Losses for Tax Purposes	'
	The Company generated net operating losses in the U.S. (“NOLs”) during periods prior to September 30, 2014. The following table summarizes the activity for NOLs for the nine months ended September 30, 2014:
	December 31, 2013	$	(140,959	)
	U.S. GAAP pretax income		59,142
	Income tax differences:
	Temporary		627
	Permanent		(20,507	)
	September 30, 2014	$	(101,697	)
Summary of Gross and Tax Affected Deferred Tax Asset Recorded	'
	A summary of the components of the gross and tax affected deferred tax asset as of September 30, 2014 is as follows:
	Stock-based compensation	$	15,689
	Deferred rent liability		5,703
	Other		111
	Total gross deferred tax asset		21,503
	Income tax rate		38.38	%
	Tax affected	$	8,253

Acquisition_and_Goodwill_Table

Acquisition and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Summary of Goodwill Activity	'
	The following table summarizes the goodwill activity for the nine months ended September 30, 2014:
	Balance at January 1, 2014	$	—
	Goodwill acquired during the period		1,676
	Balance at September 30, 2014	$	1,676

Significant_Accounting_Policie3

Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail)	9 Months Ended
	Sep. 30, 2014
Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'5 years
Furniture and Fixtures [Member]	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'15 years

Significant_Accounting_Policie4

Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Financial_Institution		Segment			Boost Issuer PLC [Member]	Boost Issuer PLC [Member]	WisdomTree Trust [Member]	WisdomTree Trust [Member]	WisdomTree Trust [Member]	WisdomTree Trust [Member]
			Financial_Institution
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Cash and cash equivalents maturity period, maximum	'	'	'90 days	'	'	'	'	'	'	'	'
Number of financial institutions	1	'	1	'	'	'	'	'	'	'	'
Accounts receivable related-party	$15,471	'	$15,471	'	$14,791	'	'	'	'	'	'
ETF advisory fee revenue	$46,942	$39,437	$133,489	$105,691	'	$282	$467	$46,660	$39,437	$133,022	$105,691
Number of operating segments	'	'	1	'	'	'	'	'	'	'	'

Investments_and_Fair_Value_Mea2

Investments and Fair Value Measurements - Schedule of Held-to-maturity Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity debt instruments	$12,224	$11,748
Federal Agency [Member]	'	'
Schedule of Held-to-maturity Securities [Line Items]	'	'
Held-to-Maturity debt instruments	$12,224	$11,748

Investments_and_Fair_Value_Mea3

Investments and Fair Value Measurements - Schedule of Unrealized Gains, Losses, and Fair Value of Held-to-maturity Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Held-to-maturity cost or amortized cost	$12,224	$11,748
Held-to-maturity gross unrealized gains	80	20
Held-to-maturity gross unrealized losses	-650	-1,459
Held-to-maturity fair value	$11,654	$10,309

Investments_and_Fair_Value_Mea4

Investments and Fair Value Measurements - Schedule of Maturity Profile of Held-to-maturity Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Held-to-maturity due within one year	'	'
Held-to-maturity due one year through five years	'	'
Held-to-maturity due five years through ten years	665	686
Held-to-maturity due over ten years	11,559	11,062
Held-to-maturity total	$12,224	$11,748

Fixed_Assets_Schedule_of_Fixed

Fixed Assets - Schedule of Fixed Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Less accumulated depreciation and amortization	($751)	($151)
Total	10,263	6,252
Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, Gross	850	518
Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, Gross	1,618	1,005
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, Gross	$8,546	$4,880

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'	'	'	'
Operating leases expenses	$778	$582	$2,372	$1,312	'
Period in which office lease expires	'	'	1-Jan-14	'	'
New lease agreement term	'	'	'16 years	'	'
New lease agreement date	'	'	'2013-08	'	'
Lease incentives received including a deferred rent period and a leasehold improvement allowance	3,223	'	3,223	'	'
Leasehold improvement allowance	509	'	509	'	3,223
Stand by letter of credit decreased	'	'	$1,384	'	$1,803

Commitments_and_Contingencies_2

Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
Remainder of 2014	$809
2015	3,054
2016	2,840
2017 and thereafter	35,126
Total	$41,829

StockBased_Awards_Additional_I

Stock-Based Awards - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Stock option issuance period	'10 years
Option issued period	'Options are issued generally for terms of ten years
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Option vested period	'3 years
Minimum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Option vested period	'2 years
Maximum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Option vested period	'4 years

StockBased_Awards_Summary_of_O

Stock-Based Awards - Summary of Options and Restricted Stock Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Options, beginning balance	7,844,691
Options, granted	'
Options, exercised/vested	-1,042,422
Options, forfeitures	'
Options, ending balance	6,802,269
Weighted average exercise price of options, beginning balance	$1.29
Weighted average exercise price of options, granted	'
Weighted average exercise price of options, exercised/vested	$0.33
Weighted average exercise price of options, forfeitures	'
Weighted average exercise price of options, ending balance	$1.44
Restricted Stock Awards [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock awards, beginning balance	1,896,877
Restricted stock awards, granted	623,088
Restricted stock awards, exercised/vested	-946,385
Restricted stock awards, forfeitures	-3,662
Restricted stock awards, ending balance	1,569,918

StockBased_Awards_Summary_of_S

Stock-Based Awards - Summary of Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]	'	'	'	'
Stock-based compensation expense	$2,077	$1,781	$6,122	$5,186

Employee_Benefit_Plans_Summary

Employee Benefit Plans - Summary of Discretionary Contributions (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'	'	'	'
Discretionary contributions	$113	$128	$506	$391

Earnings_Per_Share_Reconciliat

Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income	$10,623	$14,965	$51,429	$35,061
Shares of common stock and common stock equivalents:	'	'	'	'
Weighted averages shares used in basic computation	131,778	126,509	131,418	125,909
Dilutive effect of stock options and unvested restricted stock	6,568	13,588	7,058	13,896
Weighted averages shares used in dilutive computation	138,346	140,097	138,476	139,805
Basic earnings per share	$0.08	$0.12	$0.39	$0.28
Dilutive earnings per share	$0.08	$0.11	$0.37	$0.25

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Anti-dilutive excluded from calculation of diluted earnings per share	624,478	0	1,196,888	0

Income_Taxes_Schedule_of_Net_O

Income Taxes - Schedule of Net Operating Losses for Tax Purposes (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
31-Dec-13	($140,959)
U.S. GAAP pretax income	59,142
Income tax differences:	'
Temporary	627
Permanent	-20,507
30-Sep-14	($101,697)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Income Tax [Line Items]	'	'	'	'
Valuation allowance resulting in income tax benefit	$8,253,000	$8,253,000	$13,725,000	'
Unrecognized stock-based compensation	98,210,000	98,210,000	'	111,635,000
NOLs deemed worthless	'	3,487,000	'	'
Deferred tax asset related to NOLs	0	0	'	'
Income tax expense/(benefit)	9,634,000	5,440,000	'	'
Gross deferred tax asset	5,472,000	5,472,000	'	'
Credit to additional paid-in capital for the amount of NOLs from stock-based compensation	13,649,000	13,649,000	'	'
Income tax rate	'	38.38%	'	'
NOLs available for deferred tax asset	21,503,000	21,503,000	'	'
Foreign Subsidiaries [Member]	'	'	'	'
Schedule Of Income Tax [Line Items]	'	'	'	'
NOLs available for deferred tax asset	2,318,000	2,318,000	'	'
Deferred tax asset related to NOLs, valuation allowance	$487,000	$487,000	'	'
Previously Reported [Member]	'	'	'	'
Schedule Of Income Tax [Line Items]	'	'	'	'
Income tax rate	'	45.00%	'	'

Income_Taxes_Summary_of_Gross_

Income Taxes - Summary of Gross and Tax Affected Deferred Tax Asset Recorded (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'	'
Stock-based compensation	$15,689	'
Deferred rent liability	5,703	'
Other	111	'
Total gross deferred tax asset	21,503	'
Income tax rate	38.38%	'
Tax affected	$8,253	$13,725

Acquisition_and_Goodwill_Addit

Acquisition and Goodwill - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended
	Apr. 15, 2014	Sep. 30, 2014	Dec. 31, 2013
Business Acquisition [Line Items]	'	'	'
Time period over percentage change of ownership occur	'4 years	'	'
Business acquisition consideration transferred	$0	'	'
Payout description	'	'The ultimate payout will be made in cash over two years.	'
Payout period	'4 years	'	'
Acquisition transaction cost	'	1,607,000	'
Goodwill	'	1,676,000	'
WisdomTree Europe [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition ownership percentage	75.00%	'	'
Boost Shareholders [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition ownership percentage	25.00%	88.00%	'
Number of shareholders	'	2	'
Redeemable noncontrolling interest, ownership percentage by noncontrolling owners	'	25.00%	'
Goodwill	'	1,676,000	'
Purchase price	'	1,757,000	'
Boost Shareholders [Member] | Fair Value[Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Fair value of net assets acquired	'	81,000	'
Boost Shareholders [Member] | Minimum [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition transaction cost	'	$1,757,000	'

Acquisition_and_Goodwill_Summa

Acquisition and Goodwill - Summary of Goodwill Activity (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Business Combination, Goodwill [Abstract]	'
Beginning balance	'
Goodwill acquired during the period	1,676
Ending balance	$1,676

Shares_Repurchased_Additional_

Shares Repurchased - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'
Repurchased common stock, shares	392,346	118,156
Repurchased shares, value	$6,259	$1,413

Subsequent_Event_Additional_In

Subsequent Event - Additional Information (Detail) (Subsequent Events [Member], USD $)	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Oct. 29, 2014
Subsequent Event [Line Items]	'
Cash dividends declared	$0.08
Dividend payable, date to be paid	26-Nov-14
Dividend payable, record date	12-Nov-14
Dividend declaration date	29-Oct-14
Stock repurchase period	'3 years
Maximum [Member]	'
Subsequent Event [Line Items]	'
Common stock purchase authorized amount	100