Assets Held for Sale, net and Discontinued Operations - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 24 Months Ended | | | |
Jun. 30, 2016USD ($)Property | Jun. 30, 2015USD ($) | Jun. 30, 2016USD ($)Property | Jun. 30, 2015USD ($) | Dec. 31, 2015USD ($)Property | Dec. 31, 2015USD ($)Property | May 31, 2016Property | Apr. 30, 2016 | Apr. 01, 2016Property |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 8 | | 8 | | 7 | 7 | | | |
Liabilities related to assets held for sale | $ | $ 7,420,000 | | $ 7,420,000 | | $ 0 | $ 0 | | | |
Number of properties sold | | | | | | 104 | | | |
Proceeds from sale of real estate | $ | | | $ 50,416,000 | $ 743,110,000 | | | | | |
Intrawest Venture | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Percentage of ownership interest acquired (as a percent) | 20.00% | | 20.00% | | | | | 20.00% | 20.00% |
Percentage of ownership by parent | | | | | | | | | 100.00% |
Ski and Mountain Lifestyle Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 7 | | 7 | | | | | | 7 |
Number of properties sold | | | | | | 1 | | | |
Ski and Mountain Lifestyle Properties | Intrawest Venture | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of real estate properties acquired | | | | | | | | | 7 |
Marinas Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | | | | | 17 | 17 | | | |
Number of properties sold | | | | | | 12 | | | |
Proceeds from sale of real estate | $ | | | $ 50,400,000 | | | | | | |
Attractions Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 1 | | 1 | | | | | | |
Number of properties sold | | | | | | 4 | | | |
Senior Housing Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | | | | 38 | | | |
Disposal Group, Held-for-sale, Not Discontinued Operations | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 8 | | 8 | | 7 | 7 | | | |
Below market lease intangibles | $ | $ 7,400,000 | | $ 7,400,000 | | | | | | |
Liabilities related to assets held for sale | $ | | | | | $ 0 | $ 0 | | | |
Disposal Group, Held-for-sale, Not Discontinued Operations | Ski and Mountain Lifestyle Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 7 | | 7 | | | | 7 | | 7 |
Disposal Group, Held-for-sale, Not Discontinued Operations | Marinas Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Proceeds from sale of real estate | $ | | | $ 50,400,000 | | | | | | |
Disposition fee | $ | | | $ 0 | | | | | | |
Disposal Group, Held-for-sale, Not Discontinued Operations | Attractions Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties held for sale | 1 | | 1 | | | | | | |
Disposal Group, Held-For-Sale, Including Discontinued Operations | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Gain on sale of real estate | $ | | | $ 10,598,000 | | | | | | |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ski and Mountain Lifestyle Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | | | 1 | | | | |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Marinas Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | 5 | | | | | | |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Attractions Properties | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | | | 4 | | | | |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Undeveloped Land | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | 1 | | | | | | |
Discontinued Operations, Held-for-sale | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Gain on sale of real estate | $ | $ 9,687,000 | $ 206,625,000 | $ 9,687,000 | $ 206,625,000 | | | | | |
Discontinued Operations, Held-for-sale | Marinas Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | 17 | | | | | | |
Discontinued Operations, Held-for-sale | Senior Housing Property | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Number of properties sold | | | 38 | | | | | | |
Continuing Operations | Disposal Group, Held-for-sale, Not Discontinued Operations | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Gain on sale of real estate | $ | | | $ 911,000 | | | | | | |
Discontinued Operations | Discontinued Operations, Held-for-sale | | | | | | | | | |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | | | | | | | | | |
Gain on sale of real estate | $ | | | $ 9,687,000 | | | | | | |