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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, restricted cash | $ 5,000 |  |  |  | $ 5,000 |  |  |  |  |  |  |  | $ 5,000 | $ 5,000 |
Accumulated amortization for deferred financing costs | 33,700 |  |  |  | 29,800 |  |  |  |  |  |  |  | 33,700 | 29,800 |
Intangible Assets, Net (Including Goodwill) | 12,100 |  |  |  | 12,100 |  |  |  |  |  |  |  | 12,100 | 12,100 |
Intangible assets | 4,300 |  |  |  | 4,300 |  |  |  |  |  |  |  | 4,300 | 4,300 |
Goodwill | 7,800 |  |  |  | 7,800 |  |  |  |  |  |  |  | 7,800 | 7,800 |
Accumulated amortization of identified intangible assets | 2,600 |  |  |  | 2,200 |  |  |  |  |  |  |  | 2,600 | 2,200 |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | 2,358 | 3,999 | $ 1,940
Long-term Debt | 2,100,000 |  |  |  | 2,200,000 |  |  |  |  |  |  |  | $ 2,100,000 | 2,200,000 |
Deferred revenue, estimated period of recognition |  |  |  |  |  |  |  |  |  |  |  |  | 31 years |  |
Private REIT Subsidiaries preferred stock | 67,623 |  |  |  | $ 67,034 |  |  |  |  |  |  |  | $ 67,623 | $ 67,034 |
Operating Loss Carryforwards | 88,000 |  |  |  |  |  |  |  |  |  |  |  | 88,000 |  |
Net investment in real estate U.S federal tax basis | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |
Net investment in notes receivable U.S federal tax basis | $ 38,400 |  |  |  |  |  |  |  |  |  |  |  | $ 38,400 |  |
Tax status of Common Shares distributions [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary Income Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.169 | $ 1.217 | $ 0.680
Capital Gains Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 | 0.000 | 0.211
Nondividend Distribution |  |  |  |  |  |  |  |  |  |  |  |  | 0.081 | 0.000 | 0.000
Unrecaptured Section 1250 Gain Dividends Per Share |  |  |  |  |  |  |  |  |  |  |  |  | 0.000 | 0.000 | 0.067
Common Stock Dividends Per Share Tax Treatment |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.250 | $ 1.217 | $ 0.958
Dividends Payable, Date to be Paid | Jan. 08, 2016 | Oct. 09, 2015 | Jul. 10, 2015 | Apr. 10, 2015 | Jan. 09, 2015 | Oct. 10, 2014 | Jul. 11, 2014 | Apr. 11, 2014 | Jan. 10, 2014 | Oct. 11, 2013 | Jul. 12, 2013 | Apr. 12, 2013 |  |  |
Quarterly distribution paid per common share | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.375 | $ 0.325 | $ 0.325 | $ 0.325 | $ 0.325 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private REIT Subsidiaries preferred stock | $ 300 |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |
Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 41.00% | 40.90% | 40.70%
Arizona |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 10.10% | 9.60% | 9.80%
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of company revenue |  |  |  |  |  |  |  |  |  |  |  |  | 14.70% | 15.20% | 15.70%
Fair Value, Inputs, Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable, fair value | $ 2,200,000 |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  | $ 2,200,000 | $ 2,300,000 |
Identified Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of in-place leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 | $ 300 |
Purchase Price Allocation Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final Adjustment Period Maximum Range |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
New Manufactured Home |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |
Buildings and structural and land improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  | 30 years |  |
Building Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Furniture, Fixtures and Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment percentage to apply cost method accounting, maximum | 5.00% |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Rental income recognition period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Maximum | Used Manufactured Home |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |

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