Loans Receivable - Summary of Trust's Loans Receivable (Parenthetical) (Detail) (Mezzanine [Member])	3 Months Ended
	Mar. 31, 2014
Playa Vista Waters Edge [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Libor plus\floor	0.50%
Norridge [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Libor plus\floor	0.50%