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Future Minimum Base Rents and Future Minimum Lease Payments - Ground lease Terms Related to Properties That Are Held Subject to Long-term Noncancellable Ground Lease Obligations (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leased Assets      
Minimum rent expense $ 9,200,000 $ 1,400,000 $ 1,400,000
Ground Lease | Sunset Gower      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 7 years    
Minimum annual rent calculation, percent of land fair market value 7.50%    
Ground Lease | Del Amo      
Operating Leased Assets      
Minimum annual rent calculation, annual rent $ 1    
Ground Lease | 9300 Wilshire Blvd.      
Operating Leased Assets      
Minimum annual rent calculation, percent 6.00%    
Ground Lease | 222 Kearny Street      
Operating Leased Assets      
Minimum annual rent calculation, annual rent $ 975,000    
Minimum annual rent calculation, percent 20.00%    
Minimum annual rent calculation, operating income during lease year $ 8,000,000    
Ground Lease | 1500 Page Mill Center      
Operating Leased Assets      
Minimum annual rent calculation, percent of adjusted gross income 25.00%    
Ground Lease | Clocktower Square      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 10 years    
Minimum annual rent calculation, percent of adjusted gross income 25.00%    
Ground Lease | Palo Alto Square      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 10 years    
Minimum annual rent calculation, percent of adjusted gross income 25.00%    
Ground Lease | Lockheed Building      
Operating Leased Assets      
Minimum annual rent calculation, percent of land fair market value 10.00%    
Minimum annual rent calculation, percent of consumer price index 75.00%    
Minimum annual rent calculation, percent of adjusted gross income 24.125%    
Ground Lease | Foothill Research      
Operating Leased Assets      
Minimum annual rent calculation, percent of land fair market value 10.00%    
Minimum annual rent calculation, percent of consumer price index 75.00%    
Minimum annual rent calculation, percent of adjusted gross income 24.125%    
Ground Lease | 3400 Hillview      
Operating Leased Assets      
Minimum annual rent calculation, percent of land fair market value 10.00%    
Minimum annual rent calculation, percent of adjusted gross income 24.125%    
Minimum annual rent calculation, percent of consumer price index over the next 5 years 75.00%    
Minimum annual rent calculation, percent of consumer price index, thereafter 75.00%    
Minimum annual rent calculation, cumulative increases in consumer price index $ 1,000,000    
Ground Lease | Metro Center 989      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 10 years    
Minimum annual rent calculation, percent of land fair market value 7.233%    
Ground Lease | Metro Center Retail      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 10 years    
Minimum annual rent calculation, percent of land fair market value 7.233%    
Ground Lease | Metro Center Tower      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 10 years    
Minimum annual rent calculation, percent of land fair market value 7.233%    
Ground Lease | Techmart Commerce Center      
Operating Leased Assets      
Minimum annual rent calculation, frequency of rent adjustments 5 years    
Minimum annual rent calculation, percent 10.00%