Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Asset Impairment (Narrative) (Details)

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Asset Impairment (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Asset Impairment [Line Items]      
Impairment charges $ 23,323,000 $ 11,764,000 $ 32,378,000
Number of aircraft passed in recoverability test 22    
Number of aircraft owned 251    
Threshold for aircraft 10.00%    
Number of aircraft do not exceed threshold of 10% 9    
Flight Equipment Held For Operating Leases [Member]
     
Asset Impairment [Line Items]      
Number of aircraft owned 245    
Air Transportation Equipment [Member]
     
Asset Impairment [Line Items]      
Impairment charges 2,800,000    
Number of aircraft impaired 1    
Aggregate carrying value of nine aircrafts 104,800,000    
A320 Aircraft And Boeing 737 Classic [Member]
     
Asset Impairment [Line Items]      
Impairment charges 15,600,000    
A320 Aircraft [Member]
     
Asset Impairment [Line Items]      
Number of aircraft impaired 4    
Boeing 737 Classic [Member]
     
Asset Impairment [Line Items]      
Number of aircraft impaired 1    
Engines [Member]
     
Asset Impairment [Line Items]      
Number of engines impaired 2    
Older Than 15 Years [Member]
     
Asset Impairment [Line Items]      
Number of aircraft owned 23    
Older Than 15 Years [Member] | Flight Equipment Held For Operating Leases [Member]
     
Asset Impairment [Line Items]      
Aircraft book value, net 265,400,000    
Percentage of total flight equipment held for operating lease 3.40%    
Estimated undiscounted cash flows 305,800,000    
Percentage of total value excess over carrying value 33.00%    
Maximum [Member] | Older Than 15 Years [Member] | Flight Equipment Held For Operating Leases [Member]
     
Asset Impairment [Line Items]      
Percentage of total value excess over carrying value 198.00%    
Minimum [Member]
     
Asset Impairment [Line Items]      
Aircraft impairment analysis, age of aircraft, years 15    
Minimum [Member] | Older Than 15 Years [Member] | Flight Equipment Held For Operating Leases [Member]
     
Asset Impairment [Line Items]      
Percentage of total value excess over carrying value 2.00%    
Intangible Lease Premium [Member] | Engines [Member]
     
Asset Impairment [Line Items]      
Impairment charges $ 4,300,000