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Loans Receivable, Net - Overall Statistics for Loans Receivable Portfolio (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Floating rate loans $ 273.9 $ 216.3
Average floor rate 1.24% 1.27%
Percentage of loans subject to yield maintenance, or other prepayment restrictions 72.00% 64.00%
Percentage of loans open to repayment by borrower without penalty 28.00% 36.00%
USD LIBOR [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Percentage of loans receivable by type 91.00% 84.00%