Concentrations - Aircraft Portfolio Carrying Values by Vintage (Detail)	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Total Percentage of Portfolio	100.00%	100.00%
2007 and newer [Member]
Finite-Lived Intangible Assets [Line Items]
Total Percentage of Portfolio	3.50%	3.50%
2002-2006 [Member]
Finite-Lived Intangible Assets [Line Items]
Total Percentage of Portfolio	45.90%	45.30%
1997-2001 [Member]
Finite-Lived Intangible Assets [Line Items]
Total Percentage of Portfolio	39.70%	38.80%
1996 and older [Member]
Finite-Lived Intangible Assets [Line Items]
Total Percentage of Portfolio	10.90%	12.40%