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Real Estate Investments - Summary of Office Properties Sold (Parenthetical) (Details) - Office Properties [Member] $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 04, 2016 property | Mar. 31, 2016 property | Dec. 31, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties Sold |  | 59 |  |
Och Ziff Portfolio [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Properties Sold | 58 | 58 | [1] |
Provision for impairment on assets held for sale | $ |  |  |  | $ 45.4
[1] | Exhibit 99.2 to Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties. See also Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.

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