v3.26.1
Shareholder Report, Holdings (Details)
Jun. 30, 2026
C000002886 | Lennar Corp.B  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000002886 | Lennar Corp.AShort  
Holdings [Line Items]  
Percent of Net Asset Value (12.90%)
C000002886 | Chart Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000002886 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000002886 | Janus Henderson Group Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000002886 | Fox Corp.B  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000002886 | Taylor Morrison Home Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000002886 | The AES Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000002886 | Pan American Silver Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000002886 | Apogee Therapeutics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000002886 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 60.10%
C000002886 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value (13.10%)
C000002886 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000002886 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000002886 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000002886 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 11.90%
C000002886 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000002886 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 18.10%
C000002886 | Building and Construction - Short  
Holdings [Line Items]  
Percent of Net Asset Value (12.90%)
C000002886 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000002886 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000002886 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002886 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000002886 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000002886 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000050409 | Lennar Corp.B  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%
C000050409 | Lennar Corp.AShort  
Holdings [Line Items]  
Percent of Net Asset Value (12.90%)
C000050409 | Chart Industries Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000050409 | TXNM Energy Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 1.80%
C000050409 | Janus Henderson Group Ltd.  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000050409 | Fox Corp.B  
Holdings [Line Items]  
Percent of Net Asset Value 1.40%
C000050409 | Taylor Morrison Home Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000050409 | The AES Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.30%
C000050409 | Pan American Silver Corp.  
Holdings [Line Items]  
Percent of Net Asset Value 1.20%
C000050409 | Apogee Therapeutics Inc.  
Holdings [Line Items]  
Percent of Net Asset Value 0.90%
C000050409 | InvestmentType_Common Stocks  
Holdings [Line Items]  
Percent of Net Asset Value 60.10%
C000050409 | InvestmentType_Common Stocks – Securities Sold Short  
Holdings [Line Items]  
Percent of Net Asset Value (13.10%)
C000050409 | InvestmentType_U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000050409 | InvestmentType_Rights  
Holdings [Line Items]  
Percent of Net Asset Value 0.50%
C000050409 | InvestmentType_Closed-End Funds  
Holdings [Line Items]  
Percent of Net Asset Value 0.10%
C000050409 | InvestmentType_Other Assets and Liabilities (Net)  
Holdings [Line Items]  
Percent of Net Asset Value 11.90%
C000050409 | U.S. Government Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 40.50%
C000050409 | Building and Construction  
Holdings [Line Items]  
Percent of Net Asset Value 18.10%
C000050409 | Building and Construction - Short  
Holdings [Line Items]  
Percent of Net Asset Value (12.90%)
C000050409 | Energy and Utilities  
Holdings [Line Items]  
Percent of Net Asset Value 7.40%
C000050409 | Health Care  
Holdings [Line Items]  
Percent of Net Asset Value 6.10%
C000050409 | Entertainment  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000050409 | Financial Services  
Holdings [Line Items]  
Percent of Net Asset Value 4.20%
C000050409 | Diversified Industrial  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000050409 | Other Industry sectors  
Holdings [Line Items]  
Percent of Net Asset Value 16.70%