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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Operating Partnership's Equity Interest (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Fund I and Mervyns I [Member] |
Variable Interest Entity [Line Items] |
Operating partnership share of capital | 22.22%
Fund Size | $ 90.0
Capital called | 86.6
Unfunded Commitment | $ 0.0
Equity Interest Held By Operating Partnership (b) | 37.78%
Preferred Return | 9.00%
Total distributions | $ 194.5
Fund II and Mervyns II [Member] |
Variable Interest Entity [Line Items] |
Operating partnership share of capital | 28.33%
Fund Size | $ 300.0
Capital called | 347.1
Unfunded Commitment | $ 0.0
Equity Interest Held By Operating Partnership (b) | 28.33%
Preferred Return | 8.00%
Total distributions | $ 131.6
Fund III [Member] |
Variable Interest Entity [Line Items] |
Operating partnership share of capital | 24.54%
Fund Size | $ 502.5
Capital called | 396.7
Unfunded Commitment | $ 53.3
Equity Interest Held By Operating Partnership (b) | 39.63%
Preferred Return | 6.00%
Total distributions | $ 551.0
Fund IV [Member] |
Variable Interest Entity [Line Items] |
Operating partnership share of capital | 23.12%
Fund Size | $ 540.6
Capital called | 390.7
Unfunded Commitment | $ 139.3
Equity Interest Held By Operating Partnership (b) | 23.12%
Preferred Return | 6.00%
Total distributions | $ 101.9
Fund V [Member] |
Variable Interest Entity [Line Items] |
Operating partnership share of capital | 20.10%
Fund Size | $ 520.0
Capital called | 0.0
Unfunded Commitment | $ 520.0
Equity Interest Held By Operating Partnership (b) | 20.10%
Preferred Return | 6.00%
Total distributions | $ 0.0

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- Definition Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Share of Capital + References No definition available. + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258 + Details
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