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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of gain (loss) on sale or disposal of other assets.

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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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ASSET DISPOSALS AND IMPAIRMENTS - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Assets Held For Sale And Impairments [Line Items]
Carrying value of aircraft	$ 756,928,000		$ 756,928,000		$ 749,501,000
Gain on sale of aircraft	14,701,000	679,000	14,676,000	690,000
Impairment loss	421,000		421,000
Aircraft [Member]
Assets Held For Sale And Impairments [Line Items]
Carrying value of aircraft	20,600,000		20,600,000
Sale value of aircraft			37,000,000
Gain on sale of aircraft			16,400,000
Loss on sale of Assets			1,700,000
Aircraft [Member] \| Air Medical [Member]
Assets Held For Sale And Impairments [Line Items]
Carrying value of aircraft	800,000		800,000
Current market value for aircraft	400,000		400,000
Impairment loss			$ 400,000