Federal Income Taxes (Details 1) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation for cash dividends paid with dividends paid deduction
Cash dividends paid	$ 23,842,416us-gaap_DividendsCash	$ 21,120,059us-gaap_DividendsCash	$ 16,798,495us-gaap_DividendsCash
Less: Portion designated as capital gains distributions	(1,514,518)	(3,630,548)	(4,146,773)
Less: Return of capital	(15,973,892)	(11,334,948)	(7,013,384)
Dividends paid deduction	$ 6,354,006umh_DividendsPaidSubjectToTaxDeduction	$ 6,154,563umh_DividendsPaidSubjectToTaxDeduction	$ 5,638,338umh_DividendsPaidSubjectToTaxDeduction

Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Name:	us-gaap_DividendsCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration