Gain Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item
Gain Contingencies [Line Items]
Gain contingency, number of vessels	3
Gain contingency, unrecorded amount	$ 2,800
Gain contingency, percentage of gross proceeds	10.00%
ATEL Capital Equipment Fund VIII, LLC [Member]
Gain Contingencies [Line Items]
Gain contingency, unrecorded amount	$ 350