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Summary of Significant Accounting Policies - Summary of Gain on Sale for Each Land Parcel (Details) $ in Thousands |  |  |  | 12 Months Ended
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Mar. 16, 2018 USD ($) a Parcel | Apr. 28, 2017 USD ($) a Parcel | Jan. 30, 2017 USD ($) a Parcel | Dec. 31, 2018 USD ($) a Parcel | Dec. 31, 2017 USD ($) a Parcel | Dec. 31, 2016 USD ($) a Parcel
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Sales Price |  |  |  | $ 359,300 |  |  |  |
Proceeds from the sale of properties |  |  |  | 324,090 | $ 171,860 |  | $ 784,331 |
Gain on Sale |  |  |  | $ 3,040 | $ 953 |  | $ 9,232 |
Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  | 2 | 5 |  | 3 |
Acreage of land | a |  |  |  | 19.7 | 76.4 |  | 122.9 |
Sales Price |  |  |  | $ 15,056 | $ 29,600 |  | $ 14,938 |
Proceeds from the sale of properties |  |  |  | 14,921 | 28,618 |  | 14,532 |
Gain on Sale |  |  |  | $ 1,537 | $ 953 |  | $ 9,232 | [1]
Garza Ranch - Office [Member] | Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel | 1 |  |  |  |  |  |  |
Acreage of land | a | 6.6 |  |  |  |  |  |  |
Sales Price | $ 14,571 |  |  |  |  |  |  |
Proceeds from the sale of properties | 14,509 |  |  |  |  |  |  |
Gain on Sale | $ 1,515 |  |  |  |  |  |  |
Garza Ranch - Multifamily [Member] | Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  | 1 |  |  | 1 |  |  |
Acreage of land | a |  | 8.4 |  |  | 8.4 |  |  |
Sales Price |  | $ 11,800 |  |  | $ 11,800 |  |  |
Proceeds from the sale of properties |  | 11,560 |  |  | 11,560 |  |  |
Gain on Sale |  | $ 1,311 |  |  | $ 0 | [2] |  |
Garza Ranch - Hotel [Member] | Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  | 1 |  | 1 |  |  |
Acreage of land | a |  |  | 1.7 |  | 1.7 |  |  |
Sales Price |  |  | $ 3,500 |  | $ 3,500 |  |  |
Proceeds from the sale of properties |  |  | 3,277 |  | 3,277 |  |  |
Gain on Sale |  |  | $ 192 |  | $ 0 |  |  |
Garza Ranch [Member] | Land [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  | 3 |  |  |  |
Acreage of land | a |  |  |  | 16.7 |  |  |  |
Sales Price |  |  |  | $ 29,871 |  |  |  |
Proceeds from the sale of properties |  |  |  | 29,346 |  |  |  |
Gain on Sale |  |  |  | $ 3,018 |  |  |  |
[1] | Gain on Sale is net of closing and other transaction related costs.
[2] | The Company has a continuing involvement in this property through a completion guaranty, which requires the Company, as developer, to complete certain infrastructure improvements on behalf of the buyers of the land parcels. The Company recorded the cash received at settlement as “Deferred income, gains and rent” on the Company’s consolidated balance sheet and the Company will recognize the sale upon completion of infrastructure improvements.

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