Concentrations - Aircraft Portfolio Carrying Values by Vintage (Detail)	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Total percentage of portfolio	100.00%	100.00%
2008 and newer [Member]
Finite-Lived Intangible Assets [Line Items]
Total percentage of portfolio	9.90%	3.40%
2003-2007 [Member]
Finite-Lived Intangible Assets [Line Items]
Total percentage of portfolio	24.70%	27.40%
1998-2002 [Member]
Finite-Lived Intangible Assets [Line Items]
Total percentage of portfolio	54.60%	55.40%
1997 and older [Member]
Finite-Lived Intangible Assets [Line Items]
Total percentage of portfolio	10.80%	13.80%