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Equipment Acquisitions, Dispositions and Depreciation and Impairment Policies (Narrative) (Details) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | ||||||||
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Feb. 28, 2013
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Jun. 30, 2013
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Jun. 30, 2013
helicopter
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Jun. 30, 2012
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Jun. 30, 2013
Light Helicopter [Member]
helicopter
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Jun. 30, 2013
Medium Helicopter [Member]
helicopter
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Jun. 30, 2013
Heavy Helicopter [Member]
helicopter
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Mar. 31, 2013
EC225 Helicopter [Member]
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Mar. 31, 2013
EC225 Helicopter [Member]
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Mar. 31, 2013
Sikorsky S76A Helicopter [Member]
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Jul. 31, 2013
Subsequent Event [Member]
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| Property, Plant and Equipment [Line Items] | ||||||||||||||
| Capital expenditures | $ 30,643,000 | $ 87,034,000 | ||||||||||||
| Number of helicopters delivered | 1 | |||||||||||||
| Number of acquisitions | 2 | |||||||||||||
| Proceeds from disposition of property and equipment | 18,000,000 | 18,100,000 | 38,492,000 | 4,526,000 | 13,100,000 | |||||||||
| Receivable from disposition of property and equipment | 11,400,000 | |||||||||||||
| Receivable Collected from Sale of Propoerty, Plant and Equipment | 10,700,000 | |||||||||||||
| Number of disposals | 8 | 2 | [1] | 5 | 1 | |||||||||
| Gain on sale | 4,500,000 | 15,200,000 | 5,400,000 | |||||||||||
| Previously deferred gain | 100,000 | 100,000 | ||||||||||||
| Note receivable | 11,500,000 | 11,500,000 | ||||||||||||
| Recognized insurance proceeds | 2,100,000 | |||||||||||||
| Gain on disposition | $ 1,200,000 | |||||||||||||
| Number of helicopters previously disposed | 2 | |||||||||||||
| Number of helicopters delivered in prior year | 1 | |||||||||||||
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| X | ||||||||||
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- Definition
Deferred Gain (Loss) on Sale of Property, Plant and Equipment No definition available.
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| X | ||||||||||
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- Definition
Number of Helicopters Delivered No definition available.
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| X | ||||||||||
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- Definition
Number of Helicopters Delivered in Prior Year No definition available.
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| X | ||||||||||
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- Definition
Number of Helicopters Previously Disposed No definition available.
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| X | ||||||||||
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- Definition
Receivable Collected from Sale of Property, Plant and Equipment No definition available.
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| X | ||||||||||
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- Definition
Receivable from Sale of Property, Plant and Equipment No definition available.
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| X | ||||||||||
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- Definition
Significant Acquisitions and Disposals, Number of Acquisitions No definition available.
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| X | ||||||||||
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- Definition
Significant Acquisitions and Disposals, Number of Disposals No definition available.
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| X | ||||||||||
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- Definition
The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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