Class A - C000102856 Class A Class C - C000102857 Class C Class I - C000102859 Class I Class A - C000102863 Class A Class C - C000102860 Class C Class I - C000102862 Class I Class I - C000230715 Class I Class A - C000227186 Class A Class I - C000227187 Class I Broad Based Index:1C000102856-MSCI World Index_ MSCI World Index [Member] Additional Index:2C000102856-FTSE Global Core Infrastructure 50/50 Index [Member] FTSE Global Core Infrastructure 50/50 Index [Member] Additional Index:3C000102856-Dow Jones Brookfield Global Infrastructure Composite Index [Member] Dow Jones Brookfield Global Infrastructure Composite Index [Member] Largest Holding:5C000102856-NextEra Energy, Inc. NextEra Energy, Inc. [Member] Largest Holding:6C000102856-Union Pacific Corp. Union Pacific Corp. [Member] Largest Holding:7C000102856-Williams Cos., Inc. Williams Cos., Inc. [Member] Largest Holding:8C000102856-Aena SME SA Aena SME SA [Member] Largest Holding:9C000102856-TC Energy Corp. TC Energy Corp. [Member] Largest Holding:10C000102856-Grupo Aeroportuario del Pacifico SAB de CV - Class B Grupo Aeroportuario del Pacifico SAB de CV - Class B [Member] Largest Holding:11C000102856-Sempra Sempra [Member] Largest Holding:12C000102856-National Grid PLC National Grid PLC [Member] Largest Holding:13C000102856-CSX Corp. CSX Corp. [Member] Largest Holding:14C000102856-International Container Terminal Services, Inc. International Container Terminal Services, Inc. [Member] C000102856-United States United States C000102856-Spain Spain C000102856-United Kingdom United Kingdom C000102856-Canada Canada C000102856-Mexico Mexico C000102856-Brazil Brazil C000102856-Philippines Philippines C000102856-France France C000102856-Hong Kong Hong Kong Other Category:24C000102856-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:25C000102856-Integrated Utilities/Renewables Integrated Utilities/Renewables [Member] Industry Sector:26C000102856-Electricity Transmission & Distribution Electricity Transmission & Distribution [Member] Industry Sector:27C000102856-Midstream Midstream [Member] Industry Sector:28C000102856-Rail Rail [Member] Industry Sector:29C000102856-Airports Airports [Member] Industry Sector:30C000102856-Gas Utilities Gas Utilities [Member] Industry Sector:31C000102856-Towers Towers [Member] Industry Sector:32C000102856-Ports Ports [Member] Industry Sector:33C000102856-Data Centers Data Centers [Member] Industry Sector:34C000102856-Cash & Other Cash & Other [Member] Broad Based Index:35C000102857-MSCI World Index_ MSCI World Index [Member] Additional Index:36C000102857-FTSE Global Core Infrastructure 50/50 Index [Member] FTSE Global Core Infrastructure 50/50 Index [Member] Additional Index:37C000102857-Dow Jones Brookfield Global Infrastructure Composite Index [Member] Dow Jones Brookfield Global Infrastructure Composite Index [Member] Largest Holding:39C000102857-NextEra Energy, Inc. NextEra Energy, Inc. [Member] Largest Holding:40C000102857-Union Pacific Corp. Union Pacific Corp. [Member] Largest Holding:41C000102857-Williams Cos., Inc. Williams Cos., Inc. [Member] Largest Holding:42C000102857-Aena SME SA Aena SME SA [Member] Largest Holding:43C000102857-TC Energy Corp. TC Energy Corp. [Member] Largest Holding:44C000102857-Grupo Aeroportuario del Pacifico SAB de CV - Class B Grupo Aeroportuario del Pacifico SAB de CV - Class B [Member] Largest Holding:45C000102857-Sempra Sempra [Member] Largest Holding:46C000102857-National Grid PLC National Grid PLC [Member] Largest Holding:47C000102857-CSX Corp. CSX Corp. [Member] Largest Holding:48C000102857-International Container Terminal Services, Inc. International Container Terminal Services, Inc. [Member] Other Category:58C000102857-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:59C000102857-Integrated Utilities/Renewables Integrated Utilities/Renewables [Member] Industry Sector:60C000102857-Electricity Transmission & Distribution Electricity Transmission & Distribution [Member] Industry Sector:61C000102857-Midstream Midstream [Member] Industry Sector:62C000102857-Rail Rail [Member] Industry Sector:63C000102857-Airports Airports [Member] Industry Sector:64C000102857-Gas Utilities Gas Utilities [Member] Industry Sector:65C000102857-Towers Towers [Member] Industry Sector:66C000102857-Ports Ports [Member] Industry Sector:67C000102857-Data Centers Data Centers [Member] Industry Sector:68C000102857-Cash & Other Cash & Other [Member] Broad Based Index:69C000102859-MSCI World Index_ MSCI World Index [Member] Additional Index:70C000102859-FTSE Global Core Infrastructure 50/50 Index [Member] FTSE Global Core Infrastructure 50/50 Index [Member] Additional Index:71C000102859-Dow Jones Brookfield Global Infrastructure Composite Index [Member] Dow Jones Brookfield Global Infrastructure Composite Index [Member] Largest Holding:72C000102859-NextEra Energy, Inc. NextEra Energy, Inc. [Member] Largest Holding:73C000102859-Union Pacific Corp. Union Pacific Corp. [Member] Largest Holding:74C000102859-Williams Cos., Inc. Williams Cos., Inc. [Member] Largest Holding:75C000102859-Aena SME SA Aena SME SA [Member] Largest Holding:76C000102859-TC Energy Corp. TC Energy Corp. [Member] Largest Holding:77C000102859-Grupo Aeroportuario del Pacifico SAB de CV - Class B Grupo Aeroportuario del Pacifico SAB de CV - Class B [Member] Largest Holding:78C000102859-Sempra Sempra [Member] Largest Holding:79C000102859-National Grid PLC National Grid PLC [Member] Largest Holding:80C000102859-CSX Corp. CSX Corp. [Member] Largest Holding:81C000102859-International Container Terminal Services, Inc. International Container Terminal Services, Inc. [Member] Other Category:91C000102859-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:92C000102859-Integrated Utilities/Renewables Integrated Utilities/Renewables [Member] Industry Sector:93C000102859-Electricity Transmission & Distribution Electricity Transmission & Distribution [Member] Industry Sector:94C000102859-Midstream Midstream [Member] Industry Sector:95C000102859-Rail Rail [Member] Industry Sector:96C000102859-Airports Airports [Member] Industry Sector:97C000102859-Gas Utilities Gas Utilities [Member] Industry Sector:98C000102859-Towers Towers [Member] Industry Sector:99C000102859-Ports Ports [Member] Industry Sector:100C000102859-Data Centers Data Centers [Member] Industry Sector:101C000102859-Cash & Other Cash & Other [Member] Other Category:102C000102863-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:103C000102863-Cash & Other Cash & Other [Member] Other Category:104C000102860-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:105C000102860-Cash & Other Cash & Other [Member] Other Category:106C000102862-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:107C000102862-Cash & Other Cash & Other [Member] Other Category:108C000230715-Cash & Other_1 [Member] Cash & Other [Member] Industry Sector:109C000230715-Cash & Other Cash & Other [Member] Broad Based Index:110C000227186-MSCI Emerging Markets Net Total Return (USD) Index_ MSCI Emerging Markets Net Total Return (USD) Index [Member] Largest Holding:112C000227186-Samsung Electronics Co. Ltd. Samsung Electronics Co. Ltd. [Member] Largest Holding:113C000227186-Taiwan Semiconductor Manufacturing Co. Ltd. Taiwan Semiconductor Manufacturing Co. Ltd. [Member] Largest Holding:114C000227186-SK Hynix, Inc. SK Hynix, Inc. [Member] Largest Holding:115C000227186-Anglogold Ashanti PLC Anglogold Ashanti PLC [Member] Largest Holding:116C000227186-Alibaba Group Holding Ltd. Alibaba Group Holding Ltd. [Member] Largest Holding:117C000227186-Contemporary Amperex Technology Co. Ltd. - Class H Contemporary Amperex Technology Co. Ltd. - Class H [Member] Largest Holding:118C000227186-SK Square Co. Ltd. SK Square Co. Ltd. [Member] Largest Holding:119C000227186-Barrick Mining Corp. Barrick Mining Corp. [Member] Largest Holding:120C000227186-WuXi AppTec Company Ltd. WuXi AppTec Company Ltd. [Member] Largest Holding:121C000227186-ASE Technology Holding Co. Ltd. ASE Technology Holding Co. Ltd. [Member] C000227186-South Korea South Korea C000227186-China China C000227186-Taiwan Taiwan C000227186-India India C000227186-South Africa South Africa C000227186-Chile Chile C000227186-Indonesia Indonesia Other Category:131C000227186-Cash & Other_1 [Member] Cash & Other [Member] Broad Based Index:132C000227187-MSCI Emerging Markets Net Total Return (USD) Index_ MSCI Emerging Markets Net Total Return (USD) Index [Member] Largest Holding:133C000227187-Samsung Electronics Co. Ltd. Samsung Electronics Co. Ltd. [Member] Largest Holding:134C000227187-Taiwan Semiconductor Manufacturing Co. Ltd. Taiwan Semiconductor Manufacturing Co. Ltd. [Member] Largest Holding:135C000227187-SK Hynix, Inc. SK Hynix, Inc. [Member] Largest Holding:136C000227187-Anglogold Ashanti PLC Anglogold Ashanti PLC [Member] Largest Holding:137C000227187-Alibaba Group Holding Ltd. Alibaba Group Holding Ltd. [Member] Largest Holding:138C000227187-Contemporary Amperex Technology Co. Ltd. - Class H Contemporary Amperex Technology Co. Ltd. - Class H [Member] Largest Holding:139C000227187-SK Square Co. Ltd. SK Square Co. Ltd. [Member] Largest Holding:140C000227187-Barrick Mining Corp. Barrick Mining Corp. [Member] Largest Holding:141C000227187-WuXi AppTec Company Ltd. WuXi AppTec Company Ltd. [Member] Largest Holding:142C000227187-ASE Technology Holding Co. Ltd. ASE Technology Holding Co. Ltd. [Member] Other Category:152C000227187-Cash & Other_1 [Member] Cash & Other [Member] Net Assets Investment Company Portfolio Turnover Portfolio Turnover Commodity Index Linked Notes [Member] Commodity Index Linked Notes Sovereign Debt Securities [Member] Sovereign Debt Securities Convertible Debt Securities [Member] Convertible Debt Securities Corporate Debt Securities [Member] Corporate Debt Securities Corporate Note Securities [Member] Corporate Note Securities Corporate Bond Securities [Member] Corporate Bond Securities Fixed Income Investments [Member] Fixed Income Investments Securities Investment [Member] Securities Investment Other Aggregated Investments [Member] Other Aggregated Investments Real Estate Sector [Member] Real Estate Sector Standard Poors 500 Index [Member] Standard Poors 500 Index Nasdaq Composite Index [Member] Nasdaq Composite Index Equity Securities Industry [Member] Equity Securities Industry Equity Securities [Member] Equity Securities Dow Jones Industrial Average [Member] Dow Jones Industrial Average Construction Sector [Member] Construction Sector Automotive Sector [Member] Automotive Sector Transportation Sector [Member] Transportation Sector Aerospace Sector [Member] Aerospace Sector Consumer Sector [Member] Consumer Sector Chemicals Sector [Member] Chemicals Sector Insurance Sector [Member] Insurance Sector Cash [Member] Cash Asset Backed Securities [Member] Asset Backed Securities Container And PackagingSector [Member] Container And PackagingSector Investment Type [Axis] Asset Class US Treasury Securities [Member] US Treasury Securities Mortgage Backed Securities [Member] Mortgage Backed Securities Investment Type Categorization [Member] Investment Type Categorization Entertainment Sector [Member] Entertainment Sector Food And Beverage Sector [Member] Food And Beverage Sector Financial Services Sector [Member] Financial Services Sector Healthcare Sector [Member] Healthcare Sector Energy Sector [Member] Energy Sector Technology Sector [Member] Technology Sector Government Sector [Member] Government Sector No Trading Symbol