Borrowing Arrangements - Additional Information (Detail)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	18 Months Ended
	Jun. 15, 2016 USD ($)	Jul. 26, 2016 USD ($) Property loan	Jun. 30, 2016 USD ($) Property Rate	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Property loan Rate	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Property	Jun. 30, 2016 USD ($) Property Rate
Debt Instrument [Line Items]
Deferred financing costs, net			$ 18,900,000		$ 18,900,000		$ 19,700,000	$ 18,900,000
Mortgage notes payable			$ 1,915,834,000		$ 1,915,834,000		$ 1,926,880,000	$ 1,915,834,000
Weighted average interest rate | Rate			4.90%		4.90%			4.90%
Stated interest rate			5.533%		5.533%			5.533%
Number of pledged properties | Property							127
Pledged assets, not separately reported			$ 2,300,000,000		$ 2,300,000,000		$ 2,200,000,000	$ 2,300,000,000
Early debt retirement			0	$ (69,000)	0	$ 16,922,000
New mortgage notes payable financing proceeds					0	$ 395,323,000
Unsecured debt			199,276,000		199,276,000		$ 199,172,000	199,276,000
Maximum borrowing capacity			400,000,000		400,000,000			400,000,000
Additional borrowing capacity			$ 100,000,000		$ 100,000,000			$ 100,000,000
Debt instrument, term (in years)					1 year
Old Credit Facilities
Debt Instrument [Line Items]
Number of maturing mortgage loans repaid | loan					2
Debt repaid					$ 13,100,000
Minimum
Debt Instrument [Line Items]
Interest rate during period (in percentage) | Rate					1.20%
Line of credit facility, annual fees (in percentage)					0.20%
Maximum
Debt Instrument [Line Items]
Interest rate during period (in percentage) | Rate					1.65%
Line of credit facility, annual fees (in percentage)					0.35%
Secured Debt | Minimum
Debt Instrument [Line Items]
Stated interest rate			3.45%		3.45%			3.45%
Secured Debt | Maximum
Debt Instrument [Line Items]
Stated interest rate			8.87%		8.87%			8.87%
Line of Credit | Old Credit Facilities
Debt Instrument [Line Items]
Weighted average interest rate							5.58%
Early debt retirement							$ 17,000,000
Debt repaid								$ 370,200,000
Line of Credit | New Credit Facilities
Debt Instrument [Line Items]
Weighted average interest rate							3.93%
Debt instrument maturity year							21 years
Number of pledged properties | Property			32		32		26	32
New mortgage notes payable financing proceeds							$ 395,300,000
Term Loans
Debt Instrument [Line Items]
Unsecured debt			$ 200,000,000		$ 200,000,000		200,000,000	$ 200,000,000
Maturity date					Jan. 10, 2020
Term Loans | Minimum
Debt Instrument [Line Items]
Variable rate in addition to LIBOR rate (in percentage) | Rate					1.35%
Term Loans | Maximum
Debt Instrument [Line Items]
Variable rate in addition to LIBOR rate (in percentage) | Rate					1.95%
Manufactured homes
Debt Instrument [Line Items]
Number of pledged properties towards loans repaid | Property					2
Adjustments for New Accounting Pronouncement | Mortgages Notes Payable
Debt Instrument [Line Items]
Deferred financing costs, net							18,900,000
Adjustments for New Accounting Pronouncement | Term Loan
Debt Instrument [Line Items]
Deferred financing costs, net							800,000
Adjustments for New Accounting Pronouncement | Escrow Deposits, Goodwill and other Assets
Debt Instrument [Line Items]
Deferred financing costs, net							$ 3,700,000
Subsequent Event
Debt Instrument [Line Items]
Stated interest rate		5.99%
Number of maturing mortgage loans repaid | loan		2
Debt repaid		$ 23,900,000
Subsequent Event | Manufactured homes
Debt Instrument [Line Items]
Number of pledged properties towards loans repaid | Property		1
Subsequent Event | R V Resort
Debt Instrument [Line Items]
Number of pledged properties towards loans repaid | Property		1
Forest Lake Estates | Zephryhills, Florida
Debt Instrument [Line Items]
Stated interest rate	4.51%
Loan as direct credit to acquire	$ 22,600,000