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Summary of Significant Accounting Policies - Basis of Presentation and Real Estate Properties (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) segment community $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($)
Real Estate Properties |  |  |
Increase (decrease) in capitalized above and below market leases rental income | $ | $ 4,941 | $ 4,060 | $ 2,322
Amortization of acquired real estate leases and other intangible assets | $ | $ 92,818 | $ 80,040 | $ 38,970
Basis of Presentation |  |  |
Ownership interest in subsidiaries (as a percent) | 100.00% |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |
Segment Reporting [Abstract] |  |  |
Number of operating segments | segment | 4 |  |
Number of reportable segments | segment | 3 |  |
Furniture and Fixtures | Real Estate Investment | Maximum |  |  |
Real Estate Properties |  |  |
Estimated useful lives | 40 years |  |
Private senior living manager |  |  |
Real Estate Properties |  |  |
Number of properties acquired, referred to as managed properties | community | 5 |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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