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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2018 | Oct. 13, 2017 | Jul. 14, 2017 | Apr. 14, 2017 | Jan. 13, 2017 | Oct. 14, 2016 | Jul. 08, 2016 | Apr. 08, 2016 | Jan. 08, 2016 | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,300 | $ 5,300 |
Accumulated amortization for deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 33,900 | 31,400 |
Intangibles including goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 12,100 | 12,100 |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 4,300 | 4,300 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 7,800 | 7,800 |
Accumulated amortization of identified intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 2,900 | 2,800 |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | 2,231 | 3,373 | $ 2,358
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 2,193,700 | 2,110,200 |
Deferred revenue, estimated period of recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 years
Private REIT Subsidiaries preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | 68,088 | $ 73,304 |
Operating loss carryforwards |  |  |  |  |  |  |  |  |  |  |  |  | 13,000 |  |
Net investment in real estate U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000 |  |
Net investment in notes receivable U.S federal tax basis |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,200 |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary income (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.657 | $ 1.471 | $ 1.169
Long-term Capital Gain |  |  |  |  |  |  |  |  |  |  |  |  | 0.718 | 0.000 | 0.000
Nondividend distributions (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 | 0.179 | 0.081
Distributions declared per Common Share outstanding (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.375 | $ 1.650 | $ 1.250
Quarterly distribution paid per common share (usd per share) |  | $ 0.487500 | $ 0.487500 | $ 0.487500 | $ 0.425000 | $ 0.425000 | $ 0.425000 | $ 0.425000 | $ 0.375000 | $ 0.375000 | $ 0.375000 | $ 0.375000 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private REIT Subsidiaries preferred stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, fair value |  |  |  |  |  |  |  |  |  |  |  |  | 2,184,000 | $ 2,100,000 |
Identified Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 | 200 | $ 400
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) |  |  |  |  |  |  |  |  |  |  |  |  | 93.80% |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly distribution paid per common share (usd per share) | $ 0.4875 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income and expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax status of Common Shares distributions deemed paid during the year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400 |
Domestic Tax Authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000 | $ 88,100 |

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