Atel Financial Services and/ or Affiliates Earned Fees, Commissions, and Billed for Reimbursements Pursuant to Operating Agreement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Related Party Transaction [Line Items]
Asset management fees to Managing Member	$ 45	$ 52	$ 134	$ 144
Cost reimbursements to Managing Member	72		361	679
Related Party Transaction, Amounts of Transaction, Total	$ 117	$ 52	$ 495	$ 823