XML 60 R56.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounting Policies [Line Items] |  |  |  |
Non-cash pension expense, net of tax |  | $ 1.4 | $ 1.8 | $ 16.1
Impairment of goodwill | 1.3 | 1.2 | 2.0 |
Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Short-term investments maturity period | 3 months |  |  |
Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Cash equivalents maturity period | 3 months |  |  |
Short-term investments maturity period | 12 months |  |  |
Fuel Specialties [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Impairment of goodwill | 0 | 0 |  |
Performance Chemicals [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Impairment of goodwill | $ 0 | $ 0 |  |

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

X
- Definition Cash And Cash Equivalents Maturity Period + References No definition available. + Details
Name: | iosp_CashAndCashEquivalentsMaturityPeriod
Namespace Prefix: | iosp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Noncash Pension Expense Net Of Tax + References No definition available. + Details
Name: | iosp_NoncashPensionExpenseNetOfTax
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Short Term Investment Maturity Period + References No definition available. + Details
Name: | iosp_ShortTermInvestmentMaturityPeriod
Namespace Prefix: | iosp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration