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Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Income tax, Uncertain tax position description	The tax benefits recognized in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement.

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- Definition

Uncertain Income Tax Position Description

+ References

No definition available.

+ Details

Name:	iosp_UncertainIncomeTaxPositionDescription
Namespace Prefix:	iosp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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