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Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) - Acquisition of ETFS Business [Member]	Apr. 11, 2018
Business Acquisition [Line Items]
Weighted average cost of capital percentage	11.60%
Minimum [Member]
Business Acquisition [Line Items]
Revenue growth multiple	3.00%
Maximum [Member]
Business Acquisition [Line Items]
Revenue growth multiple	4.00%

X

- 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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X

- Definition

Estimated weighted average cost of capital.

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Of Revenue Growth

+ References

No definition available.

+ Details

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Namespace Prefix:	wetf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type:

X

- Details

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