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Loan Receivable - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Aug. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans receivable, accrued interest $ 0 $ 0  
Weighted average coupon rate on loans receivable 6.00% 7.97%  
Weighted average yield to maturity 6.00% 13.54%  
Period for the return of assets 2 years    
Lender LP [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Secured financing receivable     $ 30,000,000
Elad Canada Ltd [Member] | Lender LP [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Rate of interest for acquisition     50.00%