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Long-Term Debt - Additional Information (Detail) - USD ($) $ in Millions	Sep. 16, 2020	Sep. 30, 2020
Debt Instrument [Line Items]
Deferred finance costs, net		$ 1.4
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Due date of revolving credit	Sep. 25, 2024
Deferred finance costs capitalized	$ 0.3

X

- Definition

Deferred​ finance costs ​asset net.

+ References

No definition available.

+ Details

Name:	iosp_DeferredFinanceCostsAssetNet
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deferred finance costs capitalized.

+ References

No definition available.

+ Details

Name:	iosp_DeferredFinanceCostsCapitalized
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

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

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: