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Investments ("Held-to-Maturity") - Schedule of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity debt instruments	$ 16,229	$ 23,689
Federal Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-Maturity debt instruments	$ 16,229	$ 23,689

X

- Definition

Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_DebtSecurityAxis=wetf_FederalAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: