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Basis of Presentation - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2015
Equity Method Investments [Member]  
Accounting Policies [Line Items]  
Economic interest in unconsolidated investments in voting rights entities, minimum 20.00%key_EconomicInterestInUnconsolidatedInvestmentsInVotingRightsEntitiesMinimum
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_EquityMethodInvestmentsMember
Economic interest in unconsolidated investments in voting rights entities, maximum 50.00%key_EconomicInterestInUnconsolidatedInvestmentsInVotingRightsEntitiesMaximum
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_EquityMethodInvestmentsMember
Cost Method Investments [Member]  
Accounting Policies [Line Items]  
Economic interest in unconsolidated investments in voting rights entities, Ownership less than 20.00%key_EconomicInterestInUnconsolidatedInvestmentsInVotingRightsEntitiesOwnershipLessThan
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_CostmethodInvestmentsMember