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Real Estate Investments - Schedule of Acquired Properties through Operating Partnership (Detail)
12 Months Ended
Dec. 31, 2017
Papago Tech [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, asset acquisitions 2017-10
Real estate property, percentage owned, asset acquisitions 100.00%
Mission City and Sorrento Mesa [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, asset acquisitions 2017-09
Real estate property, percentage owned, asset acquisitions 100.00%
2525 McKinnon [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, asset acquisitions 2017-01
Real estate property, percentage owned, asset acquisitions 100.00%
SanTan [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2016-12
Real estate property, percentage owned, business combinations 100.00%
5090 N 40th St [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2016-11
Real estate property, percentage owned, business combinations 100.00%
Park Tower [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2016-11
Real estate property, percentage owned, business combinations 95.00%
FRP Collection [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2016-07
Real estate property, percentage owned, business combinations 95.00%
Carillon Point [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2016-06
Real estate property, percentage owned, business combinations 100.00%
Intellicenter [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2015-09
Real estate property, percentage owned, business combinations 100.00%
190 Office Center [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2015-09
Real estate property, percentage owned, business combinations 100.00%
DTC Crossroads [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2015-06
Real estate property, percentage owned, business combinations 100.00%
Superior Pointe [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2015-06
Real estate property, percentage owned, business combinations 100.00%
Logan Tower [Member]  
Acquisitions [Line Items]  
Real estate property, date acquired, business combinations 2015-02
Real estate property, percentage owned, business combinations 100.00%