Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
 1 Months Ended 16 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
AW139 Medium Helicopter [Member]
helicopter
Jun. 30, 2013
AW189 Heavy Helicopters [Member]
helicopter
Jun. 30, 2013
AW169 Light Twin Helicopters [Member]
helicopter
Jul. 02, 2013
Subsequent Event [Member]
helicopter
Mar. 31, 2012
Aeroleo [Member]
Jun. 30, 2013
Aeroleo [Member]
Dec. 31, 2012
Aeroleo [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]                          
Total unfunded capital commitments $ 205,600,000                        
Number of helicopters               10 5 3      
Purchase commitments payable during the period 10,600,000                        
Deposits paid on options not yet exercised 1,100,000                        
Potential reduction amount of liability 174,600,000                        
Liquidated amount liability 11,800,000                        
Additional number of helicopters             8 10          
Helicopters deliverable in 2013                   2      
Helicopters deliverable in 2014                   1      
Unfunded commitment                   35,900,000      
Impairment charge                     5,900,000    
Investment value                         0
Deferred Revenue 15,620,000 12,733,000 8,953,000 9,305,000 2,964,000 123,000           12,200,000  
Partner contributions                       $ 9,200,000