Organization and Summary of Significant Accounting Policies (Details 7) (Subsequent event, USD $) In Millions, unless otherwise specified	0 Months Ended
	Feb. 27, 2013 item
Subsequent Event
Number of aircraft engines purchased and leased back	11
Purchase price of aircraft engines	$ 65.0
Willis Mitsui & Company Engine Support Limited
Subsequent Event
Number of aircraft engines purchased and leased back	8
Purchase price of aircraft engines	54.5
SAS | Willis Mitsui & Company Engine Support Limited
Subsequent Event
Number of aircraft engines purchased and leased back	19
Purchase price of aircraft engines	$ 119.5