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Acquisitions, Dispositions and Other Significant Transactions - 2016 Transactions (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 29, 2014 community | Aug. 31, 2014 community | Dec. 31, 2016 USD ($) community | Sep. 30, 2016 USD ($) community | Mar. 31, 2016 USD ($) community | Jun. 30, 2016 USD ($) community state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) community | Dec. 31, 2015 USD ($) community
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities purchased or sold |  |  |  |  | 7 |  |  |  |
Communities classified as held for sale |  |  | 10 |  |  |  |  | 10 | 17
Proceeds from sale of assets | $ |  |  |  |  | $ 46,700,000 |  |  |  |
Number of communities under triple net leases agreement |  | 41 |  |  |  |  |  |  |
Goodwill | $ |  |  | $ 705,476,000 |  |  |  | $ 505,783,000 | $ 705,476,000 |
Impairment of assets held for sale | $ |  |  |  |  |  |  | $ 0 | $ 15,800,000 | $ 33,600,000
Agreement to sell 44 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities purchased or sold |  |  |  |  |  | 44 |  |  |
Communities classified as held for sale |  |  | 2 |  |  |  |  | 2 |
Proceeds from sale of assets | $ |  |  |  |  |  | $ 252,500,000 |  |  |
Number of states in portfolio | state |  |  |  |  |  | 12 |  |  |
Sale of 32 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities purchased or sold |  |  |  | 32 |  |  |  |  |
Proceeds from sale of assets | $ |  |  |  | $ 177,500,000 |  |  |  |  |
Sale of 9 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities purchased or sold | 9 |  | 9 |  |  |  |  |  |
Proceeds from sale of assets | $ |  |  | $ 47,700,000 |  |  |  |  |  |
Removal of one community from the agreement to sell 44 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities |  |  |  |  |  |  |  | 1 |
Decrease in sales price | $ |  |  |  |  |  |  |  | $ 4,700,000 |
Agreements to sell six communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of additional communities identified as held for sale |  |  |  |  |  |  |  | 7 |
Sale of 3 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of communities purchased or sold |  |  | 3 |  |  |  |  |  |
Proceeds from sale of assets | $ |  |  | $ 33,000,000 |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Communities classified as held for sale |  |  |  |  |  |  |  |  | 17
Goodwill | $ |  |  |  |  |  |  |  |  | $ 8,100,000
Assets held for sale | Agreements to sell six communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill | $ |  |  | $ 28,600,000 |  |  |  |  | $ 28,600,000 |
Impairment of assets held for sale | $ |  |  |  |  |  |  |  | $ 15,800,000 |
Assets held for sale | Sale of 3 communities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Communities classified as held for sale |  |  | 4 |  |  |  |  | 4 |

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