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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Variable Interest Entity [Line Items] |  |  |  |
Payments to noncontrolling interests | $ 105,994 | $ 84,610 | $ 221,330 |
Fund I and Mervyns I [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating partnership share of capital | 22.22% |  |  |
Fund Size | $ 90,000 |  |  |
Capital called | 86,600 |  |  |
Unfunded Commitment | $ 0 |  |  |
Equity Interest Held By Operating Partnership | 37.78% |  |  |
Preferred Return | 9.00% |  |  |
Total distributions | $ 194,500 |  |  |
Fund II and Mervyns II [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating partnership share of capital | 28.33% |  |  |
Fund Size | $ 300,000 |  |  |
Capital called | 347,100 |  |  |
Unfunded Commitment | $ 0 |  |  |
Equity Interest Held By Operating Partnership | 28.33% |  |  |
Preferred Return | 8.00% |  |  |
Total distributions | $ 131,600 |  |  |
Fund III [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating partnership share of capital | 24.54% |  |  |
Fund Size | $ 502,500 |  |  |
Capital called | 387,500 |  |  |
Unfunded Commitment | $ 62,500 |  |  |
Equity Interest Held By Operating Partnership | 39.63% | 24.54% |  |
Preferred Return | 6.00% |  |  |
Total distributions | $ 445,700 |  |  |
Additional ownership interest acquired |  | 4.60% |  |
Payments to noncontrolling interests |  | $ 7,300 |  |
Fund IV [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating partnership share of capital | 23.12% |  |  |
Fund Size | $ 540,600 |  |  |
Capital called | 179,400 |  |  |
Unfunded Commitment | $ 361,200 |  |  |
Equity Interest Held By Operating Partnership | 23.12% |  |  |
Preferred Return | 6.00% |  |  |
Total distributions | $ 101,900 |  |  |
Fund V [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating partnership share of capital | 20.10% |  |  |
Fund Size | $ 520,100 |  |  |
Capital called | 0 |  |  |
Unfunded Commitment | $ 520,100 |  |  |
Equity Interest Held By Operating Partnership | 20.10% |  |  |
Preferred Return | 6.00% |  |  |
Total distributions | $ 0 |  |  |
Fund II [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity Interest Held By Operating Partnership | 28.33% |  |  |
Total distributions |  |  |  | $ 47,100
Additional ownership interest acquired | 8.30% |  |  |
Payments to noncontrolling interests | $ 18,400 |  |  |

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