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Consolidated Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Balance Sheets [Abstract]    
Preferred stock, par value $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare
Series A - 8.25% Cumulative Redeemable Preferred Stock, shares authorized 3,663,800us-gaap_PreferredStockSharesAuthorized 3,663,800us-gaap_PreferredStockSharesAuthorized
Series A - 8.25% Cumulative Redeemable Preferred Stock, shares issued 3,663,800us-gaap_PreferredStockSharesIssued 3,663,800us-gaap_PreferredStockSharesIssued
Series A - 8.25% Cumulative Redeemable Preferred Stock, shares outstanding 3,663,800us-gaap_PreferredStockSharesOutstanding 3,663,800us-gaap_PreferredStockSharesOutstanding
Percentage rate on Cumulative Redeemable Preferred Stock 8.25%umh_StatedPercentageRateOnRedeemablePreferredStock 8.25%umh_StatedPercentageRateOnRedeemablePreferredStock
Common Stock, par value $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized 42,000,000us-gaap_CommonStockSharesAuthorized 42,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued 25,296,003us-gaap_CommonStockSharesIssued 24,372,083us-gaap_CommonStockSharesIssued
Common Stock, shares outstanding 25,296,003us-gaap_CommonStockSharesOutstanding 24,372,083us-gaap_CommonStockSharesOutstanding
Excess Stock, par value $ 0.10umh_ExcessStockParOrStatedValuePerShare $ 0.10umh_ExcessStockParOrStatedValuePerShare
Excess Stock, shares authorized 3,000,000us-gaap_ExcessStockSharesAuthorized 3,000,000us-gaap_ExcessStockSharesAuthorized
Excess Stock, shares issued      
Excess Stock, shares outstanding