XML 30 R28.htm IDEA: XBRL DOCUMENT v2.4.1.9

Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Segment Financial_Institution	Mar. 31, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Cash and cash equivalents maturity period, maximum	90 days
Number of financial institutions	1wetf_NumberOfFinancialInstitutions
Accounts receivable related-party	$ 23,540us-gaap_AccountsReceivableRelatedParties		$ 17,288us-gaap_AccountsReceivableRelatedParties
ETF advisory fee revenue	59,869us-gaap_InvestmentAdvisoryFees	42,609us-gaap_InvestmentAdvisoryFees
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Boost Issuer PLC [Member]
Related Party Transaction [Line Items]
ETF advisory fee revenue	523us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = wetf_BoostIssuerPlcMember
Wisdom Tree Issuer Plc [Member]
Related Party Transaction [Line Items]
ETF advisory fee revenue	523us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = wetf_WisdomTreeIssuerPlcMember
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
ETF advisory fee revenue	$ 59,346us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_WisdomtreeTrustMember	$ 42,609us-gaap_InvestmentAdvisoryFees / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wetf_WisdomtreeTrustMember

X

- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),3)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_AccountsReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of fees earned from providing investment advice and research to customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(a),(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash and cash equivalents criteria maturity period.

+ References

No definition available.

+ Details

Name:	wetf_CashAndCashEquivalentsCriteriaMaturityPeriod
Namespace Prefix:	wetf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of financial institutions.

+ References

No definition available.

+ Details

Name:	wetf_NumberOfFinancialInstitutions
Namespace Prefix:	wetf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=wetf_BoostIssuerPlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=wetf_WisdomTreeIssuerPlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=wetf_WisdomtreeTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: