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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Parenthetical) (Details) | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2016 USD ($) | Dec. 31, 2016 property | Dec. 31, 2015 USD ($) | Feb. 04, 2016 property | Jan. 15, 2016 USD ($) Parcel | Dec. 23, 2015 ft²
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Real Estate Properties | property |  |  |  | 58 |  |
Och Ziff Properties [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | $ 45,400,000 |  |  |
2970 Market Street (Cira Square) [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | $ 0 |  |  |
Purchase and Sale Agreement Date |  |  | Dec. 23, 2015 |  |  |
Rentable Square Feet | ft² |  |  |  |  |  | 862,692
Greenhills Land [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | $ 300,000 |  |  |
Number of Parcels | Parcel |  |  |  |  | 120 |
Contractual Sales Price |  |  |  |  | $ 900,000 |
Held for Sale Properties Included in Continuing Operations [Member] | Metropolitan D.C. - Office [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  | 3 |  |  |  |
Provision for impairment on assets held for sale | $ 3,000,000 |  |  |  |  |
Impairment Hold Period |  | 10 years |  |  |  |
Residual Capitalization Rates |  | 9.00% |  |  |  |
Discount Rates |  | 10.00% |  |  |  |
Held for Sale Properties Included in Continuing Operations [Member] | Other Segment - Office [Member] |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of Properties Sold | property |  | 2 |  |  |  |
Provision for impairment on assets held for sale | $ 11,500,000 |  |  |  |  |
Impairment Hold Period |  | 10 years |  |  |  |
Residual Capitalization Rates |  | 9.75% |  |  |  |
Discount Rates |  | 9.75% |  |  |  |

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