Investment in Real Estate - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			3 Months Ended		12 Months Ended	3 Months Ended						1 Months Ended	12 Months Ended
	Aug. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Purchase Price Allocation Adjustments	Mar. 10, 2014 Colony Cove [Member]	Dec. 31, 2013 Cascade [Member]	Mar. 31, 2013 Segment, Discontinued Operations [Member]	Jan. 24, 2014 R V Resort [Member] site	Jan. 07, 2014 R V Resort [Member] site	Dec. 17, 2013 R V Resort [Member]	Sep. 16, 2013 R V Resort [Member]	Mar. 31, 2014 R V Resort [Member] Diversified Portfolio [Member]	Aug. 30, 2013 Manufactured Home [Member] integer	Dec. 31, 2013 Manufactured Home [Member] Property site	Aug. 01, 2013 Manufactured Home [Member] integer	May 08, 2013 Manufactured Home [Member]	Mar. 31, 2014 Leases, Acquired-in-Place [Member]	Mar. 31, 2013 Leases, Acquired-in-Place [Member]	Mar. 31, 2014 Manufactured Home [Member]	Mar. 31, 2013 Manufactured Home [Member]	Mar. 31, 2014 Depreciable Assets [Member]	Mar. 31, 2013 Depreciable Assets [Member]	Mar. 31, 2014 Land [Member]	Mar. 31, 2013 Land [Member]	Mar. 31, 2014 New Credit Facilities [Member] R V Resort [Member]	Mar. 31, 2014 New Credit Facilities [Member] R V Resort [Member] Diversified Portfolio [Member]
Real Estate Properties [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		$ 62,981,000	$ 133,393,000															$ 773,000	$ 3,910,000	$ 769,000	$ 1,155,000	$ 20,632,000	$ 87,306,000	$ 40,807,000	$ 41,022,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other		1,197,000	1,025,000
Real Estate Investment Property, Net		3,208,749,000		3,169,566,000
Asset acquisition price adjustments period					1 year
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		0	958,000				1,000,000
Escrow Share Distribution		51,290
Number Of Properties Disposed															11
Number of Sites Disposed															5,344
Purchase Price For Disposed Properties																	165,000,000
Land		1,065,368,000		1,025,246,000
Buildings and Improvements, Gross		545,148,000		535,647,000
Real Estate Investment Property, Accumulated Depreciation		1,087,380,000		1,058,540,000
Other Assets		47,509,000		63,949,000
Secured Debt		1,976,426,000		1,992,368,000
Community Base Rental Income		106,045,000	100,776,000					5,037,000
Rental Home Income		3,757,000	3,394,000					770,000
Utility And Other Income		17,571,000	16,683,000					483,000
Disposal Group, Including Discontinued Operation, Revenue			6,290,000
Disposal Group, Including Discontinued Operation, Operating Expense			2,567,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)			3,723,000
Gains (Losses) on Sales of Other Real Estate								(34,000)
Disposal Group Including Discontinued Operation Other Income and Expenses			272,000
Disposal Group, Including Discontinued Operation, Interest Expense			(130,000)
Disposal Group, Including Discontinued Operation, Depreciation and Amortization			(763,000)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		0	4,026,000					3,068,000
Number Of Acquired Sites									682	490	284	324				1,207
Business Acquisition, Purchase Price						35,900,000						24,600,000	31,800,000			102,000,000
Number of manufactured home communities acquired														3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt																										13,300,000	18,700,000
Debt Instrument, Unamortized Discount (Premium), Net																										1,000,000	1,300,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		64,178,000	134,418,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities		14,230,000	5,382,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities		2,757,000	1,777,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		16,987,000	7,159,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		47,191,000	127,259,000
Units Issued During Period, Value, Acquisition	$ 9,700,000
Units Issued During Period, Shares, Acquisition	240,969