v2.4.0.8

Commitments, Contingencies, and Concentrations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Open purchase commitments [Abstract]
Open purchase commitments	$ 194,200,000
Total number of aircraft to be purchased under purchase commitment	60
Nonrefundable deposits	18,300,000
Number of Helicopters | Supplier Concentration Risk, Helicopter Fleet | Airbus Helicopters
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	82.00%
Number of Helicopters | Supplier Concentration Risk, Helicopter Fleet | Bell Helicopter, Inc.
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	16.00%
Number of Employees | Labor Force Concentration Risk | Pilots Under Collective Bargaining Agreement
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	28.00%
Number of Transports | Customer Concentration Risk, Transports | Private insurance carriers
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	33.00%	35.00%
Number of Transports | Customer Concentration Risk, Transports | Medicare
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	33.00%	31.00%
Number of Transports | Customer Concentration Risk, Transports | Medicaid
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	21.00%	21.00%
Number of Transports | Customer Concentration Risk, Transports | Self-pay patients
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	13.00%	13.00%
Revolving Credit Facility Due 2017
Letters of Credit [Line Items]
Number of letters of credit reducing available borrowing capacity under revolving credit facility	3
Amount of letters of credit reducing available borrowing capacity under revolving credit facility	$ 3,525,000

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date which reduces the borrowing capacity under the revolving credit facility.

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The number of letters of credit outstanding as of the balance sheet date which reduce the borrowing capacity under the revolving credit facility.

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The amount of nonrefundable deposits the entity has paid under the unrecorded unconditional purchase obligation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

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