01 - Document - Document And Entity Information {Elements} link:presentationLink link:definitionLink link:calculationLink 02 - Document - Risk/Return Summary (MainStay S&P 500 Index Fund (Prospectus Summary):) {Unlabeled} link:presentationLink link:definitionLink link:calculationLink 03 - Disclosure - Risk/Return Detail Data {Elements} link:presentationLink link:definitionLink link:calculationLink 05 - Document - Risk/Return Summary (MainStay 130/30 Core Fund (Prospectus Summary):) {Unlabeled} link:presentationLink link:definitionLink link:calculationLink 06 - Disclosure - Risk/Return Detail Data (MainStay 130/30 Core Fund):) {Elements} link:presentationLink link:definitionLink link:calculationLink 07 - Document - Risk/Return Summary (MainStay 130/30 International Fund (Prospectus Summary):) {Unlabeled} link:presentationLink link:definitionLink link:calculationLink 08 - Disclosure - Risk/Return Detail Data (MainStay 130/30 International Fund):) {Elements} link:presentationLink link:definitionLink link:calculationLink 09 - Document - Risk/Return Summary (MainStay Balanced Fund (Prospectus Summary):) {Unlabeled} link:presentationLink link:definitionLink link:calculationLink 10 - Disclosure - Risk/Return Detail Data (MainStay Balanced Fund):) {Elements} link:presentationLink link:definitionLink link:calculationLink