v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
C000005479 | Top10HoldingWelltowerBNY-95040Q104  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000005479 | Top10HoldingEquinixBNY-29444U700  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000005479 | Top10HoldingPrologisBNY-74340W103  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005479 | Top10HoldingAmerican TowerBNY-03027X100  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000005479 | Top10HoldingPublic StorageBNY-74460D109  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000005479 | Top10HoldingSimon Property GroupBNY-828806109  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000005479 | Top10HoldingVentasBNY-92276F100  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005479 | Top10HoldingEssex Property TrustBNY-297178105  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005479 | Top10HoldingRegency CentersBNY-758849103  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000005479 | Top10HoldingRexford Industrial RealtyBNY-76169C100  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000005479 | Apartment Residential  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
C000005479 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 17.10%
C000005479 | Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 15.80%
C000005479 | Data Centers  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000005479 | Infrastructure  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000005479 | Self Storage  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000005479 | Shopping Center  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000005479 | Regional Mall  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000005479 | Office  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000005479 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000005480 | Top10HoldingWelltowerBNY-95040Q104  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000005480 | Top10HoldingEquinixBNY-29444U700  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000005480 | Top10HoldingPrologisBNY-74340W103  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005480 | Top10HoldingAmerican TowerBNY-03027X100  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000005480 | Top10HoldingPublic StorageBNY-74460D109  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000005480 | Top10HoldingSimon Property GroupBNY-828806109  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000005480 | Top10HoldingVentasBNY-92276F100  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005480 | Top10HoldingEssex Property TrustBNY-297178105  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000005480 | Top10HoldingRegency CentersBNY-758849103  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000005480 | Top10HoldingRexford Industrial RealtyBNY-76169C100  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000005480 | Apartment Residential  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
C000005480 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 17.10%
C000005480 | Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 15.80%
C000005480 | Data Centers  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000005480 | Infrastructure  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000005480 | Self Storage  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000005480 | Shopping Center  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000005480 | Regional Mall  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000005480 | Office  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000005480 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%
C000166334 | Top10HoldingWelltowerBNY-95040Q104  
Holdings [Line Items]  
Percent of Net Asset Value 11.80%
C000166334 | Top10HoldingEquinixBNY-29444U700  
Holdings [Line Items]  
Percent of Net Asset Value 10.40%
C000166334 | Top10HoldingPrologisBNY-74340W103  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000166334 | Top10HoldingAmerican TowerBNY-03027X100  
Holdings [Line Items]  
Percent of Net Asset Value 5.90%
C000166334 | Top10HoldingPublic StorageBNY-74460D109  
Holdings [Line Items]  
Percent of Net Asset Value 5.40%
C000166334 | Top10HoldingSimon Property GroupBNY-828806109  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000166334 | Top10HoldingVentasBNY-92276F100  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000166334 | Top10HoldingEssex Property TrustBNY-297178105  
Holdings [Line Items]  
Percent of Net Asset Value 4.10%
C000166334 | Top10HoldingRegency CentersBNY-758849103  
Holdings [Line Items]  
Percent of Net Asset Value 3.70%
C000166334 | Top10HoldingRexford Industrial RealtyBNY-76169C100  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000166334 | Apartment Residential  
Holdings [Line Items]  
Percent of Net Asset Value 17.70%
C000166334 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 17.10%
C000166334 | Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 15.80%
C000166334 | Data Centers  
Holdings [Line Items]  
Percent of Net Asset Value 11.40%
C000166334 | Infrastructure  
Holdings [Line Items]  
Percent of Net Asset Value 8.70%
C000166334 | Self Storage  
Holdings [Line Items]  
Percent of Net Asset Value 8.20%
C000166334 | Shopping Center  
Holdings [Line Items]  
Percent of Net Asset Value 7.10%
C000166334 | Regional Mall  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000166334 | Office  
Holdings [Line Items]  
Percent of Net Asset Value 2.90%
C000166334 | Investment TypeOther Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 6.60%