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Variable Interest Entities and Investment in Unconsolidated Ventures - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Investment in Unconsolidated Joint Ventures [Line Items] |  |  |
Distributions from unconsolidated ventures from cumulative share of net earnings | $ 2,896 | $ 8,258 | $ 23,544
CCRC Venture |  |  |
Schedule of Investment in Unconsolidated Joint Ventures [Line Items] |  |  |
Equity method liability | $ 56,600 | $ 49,500 |
Non-Recourse First Mortgages | CCRC Venture |  |  |
Schedule of Investment in Unconsolidated Joint Ventures [Line Items] |  |  |
Proceeds from issuance of debt |  |  | 434,500
Distributions from unconsolidated ventures from cumulative share of net earnings |  |  | $ 221,600

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