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Commitments and Contingencies - Schedule of Expected Settlement Payment (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Payment Of Commitment And Contingencies [Line Items] |
Fines, penalties and disgorgements | $ 40.2
Fees and associated expenses | 3.9
Less discounting to fair value | 0
Government investigations and other matters Expenses, Total | 44.1
Amounts paid | (39.5)
Exchange effect | 0
Expected total amounts paid | 4.6
Due within one year | (4.6)
Total long term amount | 0
Government Authorities [Member] |
Payment Of Commitment And Contingencies [Line Items] |
Fines, penalties and disgorgements | 40.2
Fees and associated expenses | 0
Less discounting to fair value | 0
Government investigations and other matters Expenses, Total | 40.2
Amounts paid | (36.5)
Exchange effect | 0
Expected total amounts paid | 3.7
Due within one year | (3.7)
Total long term amount | 0
Compliance Monitor [Member] |
Payment Of Commitment And Contingencies [Line Items] |
Fines, penalties and disgorgements | 0
Fees and associated expenses | 3.9
Less discounting to fair value | 0
Government investigations and other matters Expenses, Total | 3.9
Amounts paid | (3.0)
Exchange effect | 0
Expected total amounts paid | 0.9
Due within one year | (0.9)
Total long term amount | $ 0

X
- Definition Discounting to fair value. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fees and associated expenses. + References No definition available. + Details
Name: | iosp_FeesAndAssociatedExpenses
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fines penalties and disgorgements undiscounted. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fixed settlement and other expenses amounts paid. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Settlement and other expenses, total. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement and other expenses, amounts outstanding. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement and other expenses, current. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Settlement and other expenses, exchange effect. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement and other expenses, noncurrent. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration