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v3.20.4

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other Commitments [Line Items] |  |
Guarantees | $ 9.9 | $ 4.7
Minimum [Member] |  |
Other Commitments [Line Items] |  |
Fixed maturity guarantee remaining term | 1 month |
Maximum [Member] |  |
Other Commitments [Line Items] |  |
Fixed maturity guarantee remaining term | 3 years |
Additional Cost To Complete Wip [Member] |  |
Other Commitments [Line Items] |  |
Capital commitments | $ 14.7 | $ 4.0

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- Definition Guarantor obligations, fixed maturity remaining term. + References No definition available. + Details
Name: | iosp_GuarantorObligationsFixedMaturityRemainingTerm
Namespace Prefix: | iosp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_OtherCommitmentsAxis=iosp_AdditionalCostToCompleteWipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |