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Commercial Real Estate Investments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 11, 2015
Real Estate Properties [Line Items]            
Gain or loss on sales of senior loan     $ (1,314,000)      
Outstanding impaired loans, nonaccrual loans, and loans in default $ 0   0   $ 0  
Allowance for loan losses     $ 0   $ 0  
Loans receivable with variable rates of interest     84.00%   77.00%  
Proceeds from sale of wholly-owned triple net leased properties     $ 12,000,000      
Gain on sale of wholly-owned triple net leased properties     $ 5,100,000      
Weighted average amortization period for intangible assets and liabilities     4 years 1 month 6 days      
Depreciation expense     $ 9,166,000 $ 10,684,000    
Commercial Mortgage Loan            
Real Estate Properties [Line Items]            
Debt issued 314,829,000   314,829,000   $ 314,865,000  
General and Administrative Expense            
Real Estate Properties [Line Items]            
Depreciation expense 3,900,000 $ 6,100,000 7,800,000 $ 10,700,000    
CALIFORNIA | Commercial Mortgage Loan | Eight Class AB Office Properties In Orange Country California            
Real Estate Properties [Line Items]            
Debt issued           $ 335,000,000
Gain or loss on sales of senior loan     0      
Senior Loans | CALIFORNIA | Commercial Mortgage Loan | Eight Class AB Office Properties In Orange Country California            
Real Estate Properties [Line Items]            
Remaining senior loans held for sale 115,000,000   115,000,000      
Remaining senior loans held for sale, net of origination fees $ 114,400,000   $ 114,400,000