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Investment in Unconsolidated Joint Ventures - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 29, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 joint_venture_site | Sep. 30, 2018 | Sep. 30, 2018 site | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites |  |  |  |  |  | 2 |  | 5,941 |
Economic interest (in percentage) |  |  |  |  |  |  | 65.00% |  |
Investment in unconsolidated joint ventures |  | $ 57,366 |  | $ 57,366 |  |  |  |  | $ 53,080
Joint venture income/(loss) |  | 788 | $ 686 | 3,596 | $ 2,876 |  |  |  |
Income from distribution made to us |  |  |  | 3,000 | 2,700 |  |  |  |
Distributions, including those in excess of basis |  |  |  | 100 | 600 |  |  |  |
Crosswinds |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Economic interest (in percentage) |  |  |  |  |  |  | 49.00% |  |
Short term loan repaid | $ 13,800 |  |  |  |  |  |  |  |
Various | Meadows |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  | 1,077 |
Economic interest (in percentage) |  |  |  |  |  |  | 50.00% |  |
Investment in unconsolidated joint ventures |  | 558 |  | 558 |  |  |  |  | 307
Joint venture income/(loss) |  |  |  | 1,252 | 1,610 |  |  |  |
Various | ECHO JV |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  | 0 |
Economic interest (in percentage) |  |  |  |  |  |  | 50.00% |  |
Investment in unconsolidated joint ventures |  | 16,076 |  | 16,076 |  |  |  |  | 15,624
Joint venture income/(loss) |  |  |  | 451 | 231 |  |  |  |
Florida | Lakeshore |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  | 720 |
Investment in unconsolidated joint ventures |  | 2,278 |  | 2,278 |  |  |  |  | 2,530
Joint venture income/(loss) |  |  |  | (62) | 10 |  |  |  |
Florida | Loggerhead |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  | 2,343 |
Economic interest (in percentage) |  |  |  |  |  |  | 49.00% |  |
Investment in unconsolidated joint ventures |  | 35,205 |  | 35,205 |  |  |  |  | 31,414
Joint venture income/(loss) |  |  |  | 1,089 | 230 |  |  |  |
Arizona | Voyager |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Number of sites | site |  |  |  |  |  |  |  | 1,801 |
Economic interest (in percentage) |  |  |  |  |  |  | 50.00% |  |
Investment in unconsolidated joint ventures |  | $ 3,249 |  | 3,249 |  |  |  |  | $ 3,205
Joint venture income/(loss) |  |  |  | $ 866 | $ 795 |  |  |  |
Recreational Vehicle Resort | Voyager |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Economic interest (in percentage) |  |  |  |  |  |  | 50.00% |  |
Servicing Assets | Voyager |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Economic interest (in percentage) |  |  |  |  |  |  | 33.00% |  |

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