3.5.0.2 html 92 12 1 false 103 0 false 2 false false R1.htm 00010 - Document - Document and Entity Information {Elements} Sheet http://www.mainstayinvestments.com/role/DocumentAndEntityInformationElements Document and Entity Information 1 false false R2.htm 00020 - Document - Risk/Return Summary (MainStay Common Stock Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayCommonStockFundUnlabeled Risk/Return Summary (MainStay Common Stock Fund) 2 false false R3.htm 00030 - Disclosure - Risk/Return Detail Data (MainStay Common Stock Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayCommonStockFund Risk/Return Detail Data (MainStay Common Stock Fund) 3 false false R4.htm 00040 - Document - Risk/Return Summary (MainStay Large Cap Growth Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayLargeCapGrowthFundUnlabeled Risk/Return Summary (MainStay Large Cap Growth Fund) 4 false false R5.htm 00050 - Disclosure - Risk/Return Detail Data (MainStay Large Cap Growth Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayLargeCapGrowthFund Risk/Return Detail Data (MainStay Large Cap Growth Fund) 5 false false R6.htm 00060 - Document - Risk/Return Summary (MainStay MAP Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayMAPFundUnlabeled Risk/Return Summary (MainStay MAP Fund) 6 false false R7.htm 00070 - Disclosure - Risk/Return Detail Data (MainStay MAP Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayMAPFund Risk/Return Detail Data (MainStay MAP Fund) 7 false false R8.htm 00080 - Document - Risk/Return Summary (MainStay International Equity Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayInternationalEquityFundUnlabeled Risk/Return Summary (MainStay International Equity Fund) 8 false false R9.htm 00090 - Disclosure - Risk/Return Detail Data (MainStay International Equity Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayInternationalEquityFund Risk/Return Detail Data (MainStay International Equity Fund) 9 false false R10.htm 00100 - Document - Risk/Return Summary (MainStay Global High Income Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayGlobalHighIncomeFundUnlabeled Risk/Return Summary (MainStay Global High Income Fund) 10 false false R11.htm 00110 - Disclosure - Risk/Return Detail Data (MainStay Global High Income Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayGlobalHighIncomeFund Risk/Return Detail Data (MainStay Global High Income Fund) 11 false false R12.htm 00120 - Document - Risk/Return Summary (MainStay Government Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayGovernmentFundUnlabeled Risk/Return Summary (MainStay Government Fund) 12 false false R13.htm 00130 - Disclosure - Risk/Return Detail Data (MainStay Government Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayGovernmentFund Risk/Return Detail Data (MainStay Government Fund) 13 false false R14.htm 00140 - Document - Risk/Return Summary (MainStay High Yield Corporate Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayHighYieldCorporateBondFundUnlabeled Risk/Return Summary (MainStay High Yield Corporate Bond Fund) 14 false false R15.htm 00150 - Disclosure - Risk/Return Detail Data (MainStay High Yield Corporate Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayHighYieldCorporateBondFund Risk/Return Detail Data (MainStay High Yield Corporate Bond Fund) 15 false false R16.htm 00160 - Document - Risk/Return Summary (MainStay Unconstrained Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayUnconstrainedBondFundUnlabeled Risk/Return Summary (MainStay Unconstrained Bond Fund) 16 false false R17.htm 00170 - Disclosure - Risk/Return Detail Data (MainStay Unconstrained Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayUnconstrainedBondFund Risk/Return Detail Data (MainStay Unconstrained Bond Fund) 17 false false R18.htm 00180 - Document - Risk/Return Summary (MainStay Tax Free Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayTaxFreeBondFundUnlabeled Risk/Return Summary (MainStay Tax Free Bond Fund) 18 false false R19.htm 00190 - Disclosure - Risk/Return Detail Data (MainStay Tax Free Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayTaxFreeBondFund Risk/Return Detail Data (MainStay Tax Free Bond Fund) 19 false false R20.htm 00200 - Document - Risk/Return Summary (MainStay Money Market Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayMoneyMarketFundUnlabeled Risk/Return Summary (MainStay Money Market Fund) 20 false false R21.htm 00210 - Disclosure - Risk/Return Detail Data (MainStay Money Market Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayMoneyMarketFund Risk/Return Detail Data (MainStay Money Market Fund) 21 false false R22.htm 00220 - Document - Risk/Return Summary (MainStay Convertible Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayConvertibleFundUnlabeled Risk/Return Summary (MainStay Convertible Fund) 22 false false R23.htm 00230 - Disclosure - Risk/Return Detail Data (MainStay Convertible Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayConvertibleFund Risk/Return Detail Data (MainStay Convertible Fund) 23 false false R24.htm 00240 - Document - Risk/Return Summary (MainStay Income Builder Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/role/DocumentRiskReturnSummaryMainStayIncomeBuilderFundUnlabeled Risk/Return Summary (MainStay Income Builder Fund) 24 false false R25.htm 00250 - Disclosure - Risk/Return Detail Data (MainStay Income Builder Fund) {Elements} Sheet http://www.mainstayinvestments.com/role/RiskReturnDetailDataMainStayIncomeBuilderFund Risk/Return Detail Data (MainStay Income Builder Fund) 25 false false R26.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 26 false false All Reports Book All Reports ck0000787441-20160909.xml ck0000787441-20160909.xsd ck0000787441-20160909_def.xml ck0000787441-20160909_lab.xml ck0000787441-20160909_pre.xml true false