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Earnings Per Share, Anti Dilution Table (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 840,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 35,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Options to purchase common shares |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 16,645 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_OptionstopurchasecommonsharesMember | 20,791 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_OptionstopurchasecommonsharesMember
Non-vested common shares, restricted stock units and performance shares |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 187,152 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_NonvestedcommonsharesrestrictedstockunitsandperformancesharesMember | 14,496 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_NonvestedcommonsharesrestrictedstockunitsandperformancesharesMember
Warrants |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 635,708 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_WarrantsMember | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kalu_WarrantsMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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