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Stockholders' Equity - Stockholders' Equity (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |
Common Stock, Beginning balance | 29,554,500 us-gaap_CommonStockSharesIssued | 29,555,000 us-gaap_CommonStockSharesIssued | 29,555,000 us-gaap_CommonStockSharesIssued
Treasury Stock, Beginning balance | 5,208,000 us-gaap_TreasuryStockNumberOfSharesHeld | 6,222,000 us-gaap_TreasuryStockNumberOfSharesHeld | 6,507,000 us-gaap_TreasuryStockNumberOfSharesHeld
Exercise of options, Common Stock | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
Exercise of options, Treasury Stock | (105,000)iosp_TreasuryStockIssuedDuringPeriodSharesShareBasedCompensationGross | (632,000)iosp_TreasuryStockIssuedDuringPeriodSharesShareBasedCompensationGross | (333,000)iosp_TreasuryStockIssuedDuringPeriodSharesShareBasedCompensationGross
Acquisition-related stock issued, Common Stock | 0 us-gaap_StockIssuedDuringPeriodSharesAcquisitions | 0 us-gaap_StockIssuedDuringPeriodSharesAcquisitions | 0 us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Acquisition-related stock issued, Treasury Stock | 0 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | (471,000)us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued | 0 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Stock purchases, Common Stock | 0 us-gaap_StockRepurchasedDuringPeriodShares | 0 us-gaap_StockRepurchasedDuringPeriodShares | 0 us-gaap_StockRepurchasedDuringPeriodShares
Stock purchases, Treasury Stock | 160,000 us-gaap_TreasuryStockSharesAcquired | 89,000 us-gaap_TreasuryStockSharesAcquired | 48,000 us-gaap_TreasuryStockSharesAcquired
Common Stock, Ending balance | 29,554,500 us-gaap_CommonStockSharesIssued | 29,554,500 us-gaap_CommonStockSharesIssued | 29,555,000 us-gaap_CommonStockSharesIssued
Ending balance, Treasury Stock | 5,263,000 us-gaap_TreasuryStockNumberOfSharesHeld | 5,208,000 us-gaap_TreasuryStockNumberOfSharesHeld | 6,222,000 us-gaap_TreasuryStockNumberOfSharesHeld

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- Definition Treasury Stock Issued During Period Shares Share Based Compensation Gross + References No definition available. + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Details
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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