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Real Estate Investments - Summary of Office Properties Sold (Parenthetical) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 04, 2016 property | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) property | Sep. 30, 2015 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Provision for impairment | $ |  | $ 0 | $ 1,800 |  |  | $ 0 | $ 13,069 |  | $ 2,508
Office Properties [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  |  | 63 |  |
Office Properties [Member] | 196/198 Van Buren Street (Herndon Metro Plaza I&II) [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Impairment of properties held for use | $ |  |  |  | $ 7,400 |  |  |  |  |
Number of Properties Sold | property |  |  |  |  |  |  | 2 |  |
Office Properties [Member] | Och Ziff Portfolio [Member] |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Number of Properties Sold | property | 58 |  |  |  |  |  | 58 | [1] |
Provision for impairment on assets held for sale | $ |  |  |  |  | $ 45,400 |  |  |  |
[1] | Exhibit 99.2 to the Company’s Current Report on Form 8-K filed on February 10, 2016 contains a complete list of the 58 properties disposed of in the transactions with Och-Ziff Capital Management Group LLC. See Note 4, "Investment in Unconsolidated Real Estate Ventures," for further details of the transactions.

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