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Earnings Per Share, Anti Dilution Table (Details)
3 Months Ended
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 840,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 35,000us-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 16,645us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kalu_OptionstopurchasecommonsharesMember
20,791us-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 187,152us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kalu_NonvestedcommonsharesrestrictedstockunitsandperformancesharesMember
14,496us-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 635,708us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kalu_WarrantsMember
0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= kalu_WarrantsMember