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Stock Compensation Plan (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of stock options outstanding      
Number of Shares 339,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod 392,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod 94,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
01/03/07 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 03, 2007    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantMember		    
Number of Shares 44,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantMember		    
Option Price 15.51umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantMember		    
Expiration Date Jan. 03, 2015    
01/03/07 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 03, 2007    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantOneMember		    
Number of Shares 5,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantOneMember		    
Option Price 17.06umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantOneMember		    
Expiration Date Jan. 03, 2015    
07/16/07 [Member]      
Summary of stock options outstanding      
Date of Grant Jul. 16, 2007    
Number of Employees 12umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwoMember		    
Number of Shares 51,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwoMember		    
Option Price 14.21umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwoMember		    
Expiration Date Jul. 16, 2015    
09/20/07 [Member]      
Summary of stock options outstanding      
Date of Grant Sep. 20, 2007    
Number of Employees 2umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThreeMember		    
Number of Shares 7,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThreeMember		    
Option Price 13.19umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThreeMember		    
Expiration Date Sep. 20, 2015    
01/08/08 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 08, 2008    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourMember		    
Number of Shares 42,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourMember		    
Option Price 11.79umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourMember		    
Expiration Date Jan. 08, 2016    
01/08/08 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 08, 2008    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFiveMember		    
Number of Shares 7,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFiveMember		    
Option Price 12.97umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFiveMember		    
Expiration Date Jan. 08, 2016    
09/25/08 [Member]      
Summary of stock options outstanding      
Date of Grant Sep. 25, 2008    
Number of Employees 11umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixMember		    
Number of Shares 33,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixMember		    
Option Price 7.55umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixMember		    
Expiration Date Sep. 25, 2016    
01/07/09 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 07, 2009    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSevenMember		    
Number of Shares 14,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSevenMember		    
Option Price 7.12umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSevenMember		    
Expiration Date Jan. 07, 2017    
01/07/09 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 07, 2009    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantEightMember		    
Number of Shares 61,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantEightMember		    
Option Price 6.47umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantEightMember		    
Expiration Date Jan. 07, 2017    
06/22/09 [Member]      
Summary of stock options outstanding      
Date of Grant Jun. 22, 2009    
Number of Employees 12umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantNineMember		    
Number of Shares 43,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantNineMember		    
Option Price 7.57umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantNineMember		    
Expiration Date Jun. 22, 2017    
01/08/10 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 08, 2010    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTenMember		    
Number of Shares 10,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTenMember		    
Option Price 9.13umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTenMember		    
Expiration Date Jan. 08, 2018    
01/08/10 [Member]      
Summary of stock options outstanding      
Date of Grant Jan. 08, 2010    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantElevenMember		    
Number of Shares 14,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantElevenMember		    
Option Price 8.3umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantElevenMember		    
Expiration Date Jan. 08, 2018    
07/27/10 [Member]      
Summary of stock options outstanding      
Date of Grant Jul. 27, 2010    
Number of Employees 12umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwelveMember		    
Number of Shares 80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwelveMember		    
Option Price 11.4umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantTwelveMember		    
Expiration Date Jul. 27, 2018    
07/05/11 [Member]      
Summary of stock options outstanding      
Date of Grant Jul. 05, 2011    
Number of Employees 11umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThirteenMember		    
Number of Shares 74,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThirteenMember		    
Option Price 11.16umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantThirteenMember		    
Expiration Date Jul. 05, 2019    
08/29/12 [Member]      
Summary of stock options outstanding      
Date of Grant Aug. 29, 2012    
Number of Employees 14umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourteenMember		    
Number of Shares 88,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourteenMember		    
Option Price 11.29umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFourteenMember		    
Expiration Date Aug. 29, 2020    
02/28/13 [Member]      
Summary of stock options outstanding      
Date of Grant Feb. 28, 2013    
Number of Employees 1umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFifteenMember		    
Number of Shares 10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFifteenMember		    
Option Price 10.02umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantFifteenMember		    
Expiration Date Feb. 28, 2021    
06/26/13 [Member]      
Summary of stock options outstanding      
Date of Grant Jun. 26, 2013    
Number of Employees 23umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixteenMember		    
Number of Shares 376,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixteenMember		    
Option Price 10.08umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSixteenMember		    
Expiration Date Jun. 26, 2021    
06/11/14 [Member]      
Summary of stock options outstanding      
Date of Grant Jun. 11, 2014    
Number of Employees 25umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfEmployees
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSeventeenMember		    
Number of Shares 339,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSeventeenMember		 [1]    
Option Price 9.85umh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionPrice
/ us-gaap_AwardTypeAxis
= umh_StockOptionsGrantSeventeenMember		    
Expiration Date Jun. 11, 2022    
[1] Unexercisable