Tenant Concentration and Segment Information (Details)	3 Months Ended
	Mar. 31, 2016 ft² item property building	Mar. 31, 2015
Number of business segments | item	1
Minimum percentage of rentable square feet of a building or land leased as a building or land parcel to single tenant	90.00%
Number of tenants under single tenant leased buildings and lands | item	1
Net rentable area | ft²	44,706,000
Oahu, HI
Percentage of revenues	19.90%	24.50%
Number of properties acquired | property	11
Number of buildings acquired | building	229
Net rentable area | ft²	17,778,000