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Cash and Cash Equivalents - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Cash equivalents	$ 336	$ 930
Total cash and cash equivalents	119,099	132,101
Two Financial Institutions [Member]
Cash and cash equivalents	118,306	131,104
European Business Segment [Member]
Minimum level of regulatory net capital	$ 28,726	$ 25,988

X

- Definition

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

No definition available.

+ Details

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X

- Definition

Cash and cash equivalents held at two financial institutions

+ References

No definition available.

+ Details

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X

- Definition

Minimum regulatory net liquid asset requirement for certain of the Company's international subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	wt_
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X

- Details

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Namespace Prefix:
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X

- Details

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