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Subsequent Events (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 02, 2019 USD ($) multiple $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 27, 2017 $ / shares
Subsequent Event [Line Items] |  |  |  |  |
Additional cash investment in equity method investment |  | $ 94,578,000 | $ 224,219,000 | $ 58,197,000 |
Fee percent of SAFE Equity up to $2.5 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity |  | 1.00% |  |  |
Fee percent of SAFE Equity up to $2.5 billion | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount |  | $ 2,500,000,000.0 |  |  |
Fee percent of SAFE Equity over $2.5 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity |  | 0.75% |  |  |
Fee percent of SAFE Equity over $2.5 billion | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount |  | $ 2,500,000,000.0 |  |  |
IPO | Safety, Income and Growth, Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Initial public offering price per share (in dollars per share) | $ / shares |  |  |  |  | $ 20.00
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management agreement, termination fee as multiple of prior year management fee | multiple | 3 |  |  |  |
Management agreement, equity raised since inception metric related to renewal and termination | $ 820,000,000 |  |  |  |
Subsequent Event | Real Estate Investment | Safety, Income and Growth, Inc. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Additional cash investment in equity method investment | $ 250,000,000 |  |  |  |
Number of Investor Units purchased (in shares) | shares | 12,500,000 |  |  |  |
Investor Units, purchase price per unit (in dollars per share) | $ / shares | $ 20.00 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity up to $1.5 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity | 1.00% |  |  |  |
Subsequent Event | Fee percent of SAFE Equity up to $1.5 billion | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 1,500,000,000.0 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity | 1.25% |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 1,500,000,000.0 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $1.5 billion and $3.0 billion | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 3,000,000,000.0 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity | 1.375% |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 3,000,000,000.0 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity between $3.0 billion and $5.0 billion | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 5,000,000,000.0 |  |  |  |
Subsequent Event | Fee percent of SAFE Equity over $5.0 billion |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee as percent of equity | 1.50% |  |  |  |
Subsequent Event | Fee percent of SAFE Equity over $5.0 billion | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Management fee equity threshold amount | $ 5,000,000,000.0 |  |  |  |

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