Common Shares [Member] Investment and Market Risks [Member] Management Risks [Member] Securities Risks [Member] Municipal Bond Risks [Member] State Specific and Industry Risk [Member] Puerto Rico Municipal Bond Risks [Member] Tobacco Settlement Bond Risks [Member] Credit and Below Investment Grade Securities Risks [Member] Municipal Market Data Rate Locks [Member] Inflation/Deflation Risk [Member] Tactical Municipal CEF Strategy Risk [Member] Underlying Fund Risks [Member] Defaulted and Distressed Securities Risks [Member] Illiquid Securities Risks [Member] Valuation Risk [Member] Tender Option Bonds Risks [Member] Insurance Risks [Member] Tax Risks [Member] Derivatives Risks [Member] Options and Futures Risks [Member] Market Events Risks [Member] Artificial Intelligence [Member] Swap Risks [Member] Short Sale Risks [Member] Rating Agency Risk [Member] United States Credit Rating Downgrade Risk [Member] Legislation and Regulatory Risks [Member] Defensive Measures [Member] Market Discount [Member] Limited Term and Eligible Tender Offer Risk [Member] Investment Style Risk [Member] Multi-Manager Risk [Member] Asset Allocation Risk [Member] Leverage Risks [Member] Liquidity Risk [Member] Portfolio Turnover Risk [Member] Potential Conflicts of Interest Risk [Member] Stockholder Activism [Member] Cybersecurity Risk [Member] Anti-Takeover Provisions [Member] Risks Associated with Additional Offerings [Member] Secondary Market for the Common Shares [Member]