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Related Party Transactions - Schedule of Amount Outstanding to Affiliates (Detail) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Due to Affiliate $ 8,146,000 $ 8,118,000
Contingent Advisor Payment Incurred [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate 7,760,000 7,744,000
Asset And Property Management Fees [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate 325,000 316,000
Operating Expense [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate 9,000 6,000
Construction Management Fee [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate 1,000 1,000
Property Management Fee [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate 51,000 43,000
Lease Commissions [Member]    
Related Party Transaction [Line Items]    
Due to Affiliate $ 0 $ 8,000