Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Property mo Customer OptionPlan	Dec. 31, 2016
Commitment And Contingencies [Line Items]
Termination payment, as high as | $	$ 7.5
Transfer taxes accrued in connection with the Offering | $	$ 6.6
Maximum percentage of total revenue provided by any single tenant	10.00%	10.00%
Southern California
Commitment And Contingencies [Line Items]
Number of consolidated properties located in Southern California | Property	13
Total Revenue | Southern California
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	31.00%
Total Revenue | Hawaii
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	19.60%
Rental Income
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	9.70%
Number of tenants that comprise 9.7% of total annualized based rent | Customer	3
Total Revenues | Retail industry
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	33.00%	34.20%
Total Revenues | Office industry
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	33.60%	35.00%
Base Rent | salesforce.com, inc.
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	7.90%
Alamo Quarry Market and Waikele Center | Total Revenue
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	13.20%	14.40%
Maximum | Tenants
Commitment And Contingencies [Line Items]
Percentage of total revenue provided by properties	2.00%
Maximum | Del Monte Center | Ground Water Contamination
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	7 years
Minimum | Del Monte Center | Ground Water Contamination
Commitment And Contingencies [Line Items]
Environmental remediation monitoring period	5 years
The Land Mark at One Market
Commitment And Contingencies [Line Items]
Number of lease extension options | OptionPlan	2
Years, lease extension options length	5 years
Waikiki Beach Walk - Retail
Commitment And Contingencies [Line Items]
Property management fee, percent	3.00%
Outrigger Hotels
Commitment And Contingencies [Line Items]
Property management fee, percent	6.00%
Number of calendar months termination fee is based	2 months
Maximum percentage of hotel's fiscal year gross revenues paid for aggregate yearly management fee	3.50%
Previous months of management fees	12 months
Hotel management agreement default penalty factor of previous twelve months of management fees in first 11 years of term	8
Years in hotel management agreement term	11 years
Hotel management agreement default penalty factor of previous twelve months of management fees in twelfth year of term	4
Hotel management agreement default penalty factor of previous twelve months of management fees in thirteenth year of term	3
Hotel management agreement default penalty factor of previous twelve months of management fees in fourteenth year of term	2
Hotel management agreement default penalty factor of previous twelve months of management fees in fifteenth year of term	1
Outrigger Hotels | Year of Agreement, 12th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	15 years
Outrigger Hotels | Year of Agreement, 13th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	14 years
Outrigger Hotels | Year of Agreement, 14th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	13 years
Outrigger Hotels | Year of Agreement, 15th
Commitment And Contingencies [Line Items]
Years in hotel management agreement term	12 years
Outrigger Hotels | Maximum
Commitment And Contingencies [Line Items]
Property management fee, percent	3.00%
Wbw Hotel Lessee Llc
Commitment And Contingencies [Line Items]
Years of contract	20 years
Percentage of hotel occupancy gross revenue paid for program fee	4.00%
Wbw Hotel Lessee Llc | Future Time Period Prior to 12-31-2021
Commitment And Contingencies [Line Items]
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	4.00%
Wbw Hotel Lessee Llc | Future Time Period After 12-31-2021
Commitment And Contingencies [Line Items]
Percentage of hotel occupancy gross revenue paid for franchise royalty fee	5.00%