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Employee Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity and Employee Benefit Plans Disclosure [Abstract]
Employee contribution benefit plan expense	$ 4.4	$ 3.4

X

- Definition

Stockholders' Equity and Employee Benefit Plans Disclosure [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	fet_
Data Type:	xbrli:stringItemType
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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

+ Details

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Period Type:	duration