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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Parenthetical) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) ft² | Feb. 04, 2016 ft² property | Jan. 15, 2016 USD ($) Parcel | Dec. 23, 2015 ft²
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Rentable Square Feet | ft² | 4,300,000 |  |  |
Subsequent Event [Member] |  |  |  |
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 |  |  |
Och Ziff Properties [Member] | Subsequent Event [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Rentable Square Feet | ft² |  | 3,924,783 |  |
2970 Market Street [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 |  |  |
Greenhills Land [Member] | Subsequent Event [Member] |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Number of Parcels | Parcel |  |  | 120 |
Contractual Sales Price |  |  | $ 900,000 |

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