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SHAREHOLDER'S EQUITY SHAREHOLDERS' EQUITY, STOCK CHANGES (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Stock Split [Line Items]    
Common stock, shares authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
prestocksplit [Domain]    
Stock Split [Line Items]    
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= alk_PrestocksplitDomain		  
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= alk_PrestocksplitDomain