Quarterly report pursuant to Section 13 or 15(d)

Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details)

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Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Aug. 31, 2013
Feb. 28, 2013
Sep. 30, 2013
Sep. 30, 2013
helicopter
Sep. 30, 2012
Sep. 30, 2013
Light Helicopter [Member]
helicopter
Sep. 30, 2013
Medium Helicopter [Member]
helicopter
Sep. 30, 2013
Heavy Helicopter [Member]
helicopter
Mar. 31, 2013
EC225 Helicopter [Member]
Mar. 31, 2013
EC225 Helicopter [Member]
Mar. 31, 2013
Sikorsky S76A Helicopter [Member]
Oct. 31, 2013
Subsequent Event [Member]
Medium Helicopter [Member]
Property, Plant and Equipment [Line Items]                        
Capital expenditures       $ 48,223,000 $ 91,155,000              
Number of acquisitions             3          
Number of helicopters delivered in prior year             1          
Number of disposals       12   2 [1] 9 [2] 1        
Number of helicopters previously disposed       2                
Gain on sale     2,600,000 17,700,000           5,400,000    
Proceeds from disposition of property and equipment 9,900,000 18,000,000 10,200,000 59,976,000 4,887,000       24,600,000      
Recognized insurance proceeds                     2,100,000  
Receivable from disposition of property and equipment       200,000                
Previously deferred gain     100,000 100,000                
Gain on disposition                     $ 1,200,000 $ 300,000
[1] Includes two light-twin helicopters that had previously been removed from service.
[2] Does not include the AW139 helicopter to be transferred to the manufacturer for trade-in credit as described below.