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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Effect of tax rate portion in state tax	50.00%	50.00%	50.00%

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- Definition

Effect of tax rate portion in state tax.

+ References

No definition available.

+ Details

Name:	iosp_EffectOfTaxRatePortionInStateTax
Namespace Prefix:	iosp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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