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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Acquisition Costs Expensed |  |  | $ 2,171
Vesting period (in years) | 5 years |  |
Expiration period of options (in years) | 10 years |  |
Number of operating segments | segment | 1 |  |
Rental revenue | $ 320,622 | $ 395,339 | 391,641
NNN Office Joint Venture |  |  |
Property, Plant and Equipment [Line Items] |  |  |
VIE, ownership percentage | 90.00% |  |
Accounting Standards Update 2018-11 |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Rental revenue |  | $ 30,608 | $ 31,809
Building and Building Improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Maximum useful life of PPE (in years) | 40 years |  |
Variable Interest Entity, Primary Beneficiary |  |  |
Property, Plant and Equipment [Line Items] |  |  |
VIE, ownership percentage | 96.00% |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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