Loans Receivable - Overall Statistics for Loans Receivable Portfolio (Parenthetical) (Detail)	Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans subject to yield maintenance, lock-out provisions, or other prepayment restrictions	89.00%
Percentage of loans open to repayment by borrower	11.00%
One-Month LIBOR [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable by type	83.00%
Three-Month LIBOR [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable by type	17.00%
LIBOR [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loans receivable by type	18.00%
Average floor rate	0.31%