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Loan Receivable - Summary of Loan Receivable (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net $ 0 $ 8,400 $ 8,400
Jacksonville, Florida [Member] | Whole Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, net   $ 8,400  
Contractual Maturity Date Jul. 01, 2019    
Jacksonville, Florida [Member] | Whole Loan [Member] | LIBOR [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest rate spread on LIBOR based mortgage loans   5.00%