Equity Real Estate Investment Trusts Reits [Member] Pharmaceuticals Biotechnology And Life Sciences [Member] Consumer Staples Distribution And Retail [Member] Health Care Equipment And Services [Member] Banks [Member] Consumer Discretionary Distribution And Retail [Member] Technology Hardware And Equipment [Member] Media And Entertainment [Member] Software And Services [Member] Semiconductors And Semiconductor Equipment [Member] Capital Goods [Member] Common Stocks Sold Short [Member] C000072947 [Member] Class I C000072945 [Member] Class C C000072944 [Member] Class A Transportation Sector [Member] Insurance Sector [Member] Financial Services Sector [Member] Energy Sector [Member] Common Stock [Member] Repurchase Agreements [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag