Loans Receivable - Summary of Loans Receivable (Parenthetical) (Detail) - USD ($)		12 Months Ended
	Oct. 05, 2016	Dec. 31, 2016
Jacksonville, Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ceiling rate, percentage		8.00%
Churchill [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan discounted payoff amount	$ 100,000
Whole Loan [Member] | Jacksonville, Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor, percentage		6.00%
Whole Loan [Member] | Churchill [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan discounted payoff amount		$ 100,000