Loans Receivable - Summary of Trust's Loans Receivable (Parenthetical) (Detail) (Mezzanine [Member])	9 Months Ended
	Sep. 30, 2014
Playa Vista Waters Edge [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor, percentage	0.50%
Edens Center and Norridge Commons [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LIBOR floor, percentage	0.50%