Shareholder Report, Holdings (Details)
|
Dec. 31, 2025 |
| C000099785 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000099785 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000099785 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000099785 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000099785 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099785 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000099785 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000099785 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099785 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099785 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000099785 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000099785 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000099785 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099785 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000099785 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099785 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099785 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099785 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000099785 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099785 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099785 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099787 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000099787 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000099787 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000099787 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000099787 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099787 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000099787 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000099787 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099787 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099787 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000099787 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000099787 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000099787 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099787 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000099787 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099787 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099787 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099787 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000099787 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099787 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099787 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099788 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000099788 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000099788 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000099788 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000099788 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099788 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000099788 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000099788 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099788 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099788 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000099788 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000099788 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000099788 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099788 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000099788 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099788 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099788 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099788 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000099788 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099788 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099788 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000148175 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000148175 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000148175 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000148175 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000148175 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000148175 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000148175 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000148175 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000148175 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000148175 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000148175 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000148175 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000148175 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000148175 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000148175 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000148175 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000148175 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000148175 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000148175 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000148175 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000148175 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099789 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000099789 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000099789 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000099789 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000099789 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099789 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000099789 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000099789 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099789 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099789 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000099789 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000099789 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000099789 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099789 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000099789 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099789 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099789 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099789 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000099789 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099789 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099789 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|
| C000099790 | Prologis, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
9.70%
|
| C000099790 | Welltower, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
8.60%
|
| C000099790 | Simon Property Group, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
6.00%
|
| C000099790 | Equinix, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.90%
|
| C000099790 | SBA Communications Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
5.20%
|
| C000099790 | Crown Castle, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
4.80%
|
| C000099790 | Realty Income Corp. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.90%
|
| C000099790 | Equity Residential |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.70%
|
| C000099790 | Ventas, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.60%
|
| C000099790 | Extra Space Storage, Inc. |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.40%
|
| C000099790 | IndustrySpecialized REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
31.00%
|
| C000099790 | IndustryHealth Care REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
18.00%
|
| C000099790 | IndustryRetail REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
17.00%
|
| C000099790 | IndustryIndustrial REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
13.00%
|
| C000099790 | IndustryResidential REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
12.00%
|
| C000099790 | IndustryHotel & Resort REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099790 | IndustryDiversified REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
3.00%
|
| C000099790 | IndustryOffice REITs |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
2.00%
|
| C000099790 | AssetCommon Stocks |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
99.00%
|
| C000099790 | AssetCash Equivalents |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
1.00%
|
| C000099790 | Asset Other Net Line |
|
| Holdings [Line Items] |
|
| Percent of Net Asset Value |
0.00%
|