Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands													12 Months Ended
	Jan. 13, 2017	Oct. 14, 2016	Jul. 08, 2016	Apr. 08, 2016	Jan. 08, 2016	Oct. 09, 2015	Jul. 10, 2015	Apr. 10, 2015	Jan. 09, 2015	Oct. 10, 2014	Jul. 11, 2014	Apr. 11, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Cash and cash equivalents, restricted cash													$ 5,300	$ 5,000
Accumulated amortization for deferred financing costs													31,400	33,700
Intangibles including goodwill													12,100	12,100
Intangible assets													4,300	4,300
Goodwill													7,800	7,800
Accumulated amortization of identified intangible assets													2,800	2,600
Amortization of in-place leases													3,373	2,358	$ 3,999
Long-term debt													$ 2,100,000	$ 2,100,000
Deferred revenue, estimated period of recognition													40 years	31 years	31 years
Private REIT Subsidiaries preferred stock													$ 73,304	$ 67,623
Operating loss carryforwards													88,100
Net investment in real estate U.S federal tax basis													2,800,000
Net investment in notes receivable U.S federal tax basis													$ 36,500
Tax status of Common Shares distributions deemed paid during the year:
Ordinary income (usd per share)													$ 1.471	$ 1.169	$ 1.217
Nondividend distributions (usd per share)													0.179	0.081	0.000
Distributions declared per Common Share outstanding (usd per share)													$ 1.650	$ 1.250	$ 1.217
Quarterly distribution paid per common share (usd per share)		$ 0.425	$ 0.425	$ 0.425	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.325	$ 0.325	$ 0.325	$ 0.325
Preferred Stock
Significant Accounting Policies [Line Items]
Private REIT Subsidiaries preferred stock													$ 300
Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Mortgage notes payable, fair value													2,100,000	$ 2,200,000
Identified Intangible Assets
Significant Accounting Policies [Line Items]
Amortization of in-place leases													$ 200	$ 400	$ 300
New Manufactured Home
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													25 years
Buildings and structural and land improvements
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													30 years
Building Improvements
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													10 years
Furniture, Fixtures and Equipment
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													5 years
Maximum
Significant Accounting Policies [Line Items]
Investment percentage to apply cost method accounting, maximum (in percentage)													5.00%
Maximum | Used Manufactured Home
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													25 years
Minimum
Significant Accounting Policies [Line Items]
Right-to-use properties contract, term													1 year
Minimum | Used Manufactured Home
Significant Accounting Policies [Line Items]
Estimated useful life (in years)													10 years
Variable Interest Entity, Primary Beneficiary
Significant Accounting Policies [Line Items]
Ownership percentage (in percentage)													92.30%
Subsequent Event
Tax status of Common Shares distributions deemed paid during the year:
Payment Date	Jan. 13, 2017
Quarterly distribution paid per common share (usd per share)	$ 0.425