Shareholder Report, Holdings (Details)	Jun. 30, 2025
C000002886 \| 2110311
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000002886 \| 2612096
Holdings [Line Items]
Percent of Net Asset Value	(16.30%)
C000002886 \| 4153747
Holdings [Line Items]
Percent of Net Asset Value	0.50%
C000002886 \| 2225995
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000002886 \| 2110995
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000002886 \| 2107182
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000002886 \| 2105398
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000002886 \| 2110679
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000002886 \| 1995576
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000002886 \| 2434095
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000002886 \| 2109835
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000002886 \| InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	62.10%
C000002886 \| InvestmentType_Securities Sold Short
Holdings [Line Items]
Percent of Net Asset Value	(18.60%)
C000002886 \| InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000002886 \| InvestmentType_Rights
Holdings [Line Items]
Percent of Net Asset Value	0.30%
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	15.70%
C000002886 \| U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000002886 \| Building and Construction - Long
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000002886 \| Building and Construction - Short
Holdings [Line Items]
Percent of Net Asset Value	(16.30%)
C000002886 \| Health Care
Holdings [Line Items]
Percent of Net Asset Value	7.60%
C000002886 \| Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	6.30%
C000002886 \| Financial Services
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000002886 \| Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000002886 \| Entertainment
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000002886 \| Real Estate - Long
Holdings [Line Items]
Percent of Net Asset Value	2.90%
C000002886 \| Real Estate - Short
Holdings [Line Items]
Percent of Net Asset Value	(2.20%)
C000050409 \| 2110311
Holdings [Line Items]
Percent of Net Asset Value	19.70%
C000050409 \| 2612096
Holdings [Line Items]
Percent of Net Asset Value	(16.30%)
C000050409 \| 4153747
Holdings [Line Items]
Percent of Net Asset Value	0.50%
C000050409 \| 2225995
Holdings [Line Items]
Percent of Net Asset Value	3.60%
C000050409 \| 2110995
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000050409 \| 2107182
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000050409 \| 2105398
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000050409 \| 2110679
Holdings [Line Items]
Percent of Net Asset Value	1.30%
C000050409 \| 1995576
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000050409 \| 2434095
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000050409 \| 2109835
Holdings [Line Items]
Percent of Net Asset Value	0.90%
C000050409 \| InvestmentType_Common Stocks
Holdings [Line Items]
Percent of Net Asset Value	62.10%
C000050409 \| InvestmentType_Securities Sold Short
Holdings [Line Items]
Percent of Net Asset Value	(18.60%)
C000050409 \| InvestmentType_U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000050409 \| InvestmentType_Rights
Holdings [Line Items]
Percent of Net Asset Value	0.30%
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	15.70%
C000050409 \| U.S. Government Obligations
Holdings [Line Items]
Percent of Net Asset Value	40.40%
C000050409 \| Building and Construction - Long
Holdings [Line Items]
Percent of Net Asset Value	19.80%
C000050409 \| Building and Construction - Short
Holdings [Line Items]
Percent of Net Asset Value	(16.30%)
C000050409 \| Health Care
Holdings [Line Items]
Percent of Net Asset Value	7.60%
C000050409 \| Energy and Utilities
Holdings [Line Items]
Percent of Net Asset Value	6.30%
C000050409 \| Financial Services
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000050409 \| Telecommunications
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000050409 \| Entertainment
Holdings [Line Items]
Percent of Net Asset Value	3.00%
C000050409 \| Real Estate - Long
Holdings [Line Items]
Percent of Net Asset Value	2.90%
C000050409 \| Real Estate - Short
Holdings [Line Items]
Percent of Net Asset Value	(2.20%)