Document and Entity Information [Abstract] Statement [Table] Class of Stock [Axis] Class Of Stock [Domain] Common Stock [Member] Voting Common Stock Voting Common Stock [Member] Nonvoting Common Stock [Member] Non-Voting Common Stock Non-Voting Common Stock [Member] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Condensed Consolidating Balance Sheets Condensed Consolidated Balance Sheets [Abstract] ASSETS Assets [Abstract] Current Assets: Assets, Current [Abstract] Cash Cash Short-term investments Short Term Investments Accounts receivable - net Accounts Receivable, Net, Current [Abstract] Trade Receivable Net Current Trade Trade. Other Other Receivables, Net, Current Inventories of spare parts - net Inventory, Net Other current assets Other Assets, Current Income taxes receivable Income Taxes Receivable, Current Total current assets Assets, Current, Total Other Other assets Other Assets, Noncurrent Property and equipment - net Property, Plant and Equipment, Net Total assets Assets, Total LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Current Liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Total current liabilities Liabilities, Current, Total Long-term debt Long-term Debt, Excluding Current Maturities Deferred income taxes Deferred Tax Liabilities, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities, Total Commitments and contingencies (Note 3) Commitments and Contingencies Shareholders' Equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive loss Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total shareholders' equity Balance Balance Stockholders' Equity Attributable to Parent, Total Total liabilities and equity Liabilities and Equity, Total Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Condensed Consolidating Statements of Operations Condensed Consolidated Statements of Operations [Abstract] Operating revenues, net Total operating revenues Sales Revenue, Services, Net Gain (Loss) on Disposition of Assets Loss on disposal of assets, net Expenses: Costs and Expenses [Abstract] Direct expenses Total direct expenses Operating Costs and Expenses Selling, general and administrative expenses Selling, General and Administrative Expense Interest expense Interest Expense Total expenses Costs and Expenses Earnings before income taxes Earnings before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income tax expense Income Tax Expense (Benefit) Net earnings Net earnings Net earnings Net Income (Loss) Attributable to Parent Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted average common shares (voting and non-voting) outstanding Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Net earnings per share: Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Condensed Consolidated Statements of Comprehensive Income [Abstract] Unrealized gain on short-term investments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Changes in pension plan assets and benefit obligations Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total comprehensive income, net of income taxes Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Condensed Consolidated Statements of Shareholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Additional Paid-in Capital Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) Retained Earnings Retained Earnings Balance, shares Balance, shares Balance Condensed Consolidating Statements of Cash Flows Condensed Consolidated Statements of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Expense Depreciation Deferred income taxes Deferred Income Tax Expense (Benefit) Other Other Noncash Income (Expense) Changes in operating assets and liabilities Increase (Decrease) in Operating Capital Net cash provided by (used in) operating activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from asset dispositions Proceeds from Sale of Property, Plant, and Equipment Purchase of short-term investments Payments to Acquire Short-term Investments Proceeds from sale of short-term investments Proceeds from Sale of Short-term Investments Payment of Deposits for Purchase of Aircraft Payment for deposits on aircraft , net of funds Deposits on aircraft. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from line of credit Proceeds from Long-term Lines of Credit Payments on line of credit Repayments of Long-term Lines of Credit Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Decrease in cash Cash, beginning of period Cash, end of period Cash and Cash Equivalents, at Carrying Value, Beginning Balance Supplemental Disclosures Cash Flow Information Supplemental Cash Flow Information [Abstract] Cash Paid During Period for [Abstract] Cash paid during the period for. Cash paid during the period for: Interest Interest Paid Income taxes Income Taxes Paid Noncash investing activities: Noncash Investing and Financing Items [Abstract] Other current liabilities and accrued payables related to purchase of property and equipment Capital Expenditures Incurred but Not yet Paid General [Abstract] General Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Segment Information [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Commitments and Contingencies [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Long-term Debt [Abstract] Long-term Debt Long-term Debt [Text Block] Valuation Accounts [Abstract] Valuation Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Employee Compensation [Abstract] Employee Compensation Compensation and Employee Benefit Plans [Text Block] Fair Value Measurements [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Investments [Abstract] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Shareholders' Equity [Abstract] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Condensed Consolidating Financial Information [Abstract] Condensed consolidating financial information. Condensed Consolidating Financial Information Disclosure [Text Block] Condensed Consolidating Financial Information Condensed consolidating financial information. Schedule of Provisions for Contractual Discounts and Estimated Uncompensated Care as Percentage of Gross Billings [Table Text Block] Schedule of provisions for contractual discounts and estimated uncompensated care as percentage of gross billings Schedule of provisions for contractual discounts and estimated uncompensated care as percentage of gross billings. Schedule of Net Revenue Attributable to Medicaid, Medicare Insurance and Self-Pay as Percentage of Net Air Medical Revenues [Table Text Block] Schedule of net revenue attributable to Medicaid, Medicare, Insurance, and Self-Pay as a percentage of net Air Medical revenues Schedule of net revenue attributable to Medicaid, Medicare insurance and self pay as percentage of net air medical revenues. Schedule of financial information concerning reportable operating segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Depreciation Expense Included in Direct Expenses and Unallocated Selling General and Administrative Costs [Table Text Block] Depreciation expense included in direct expenses and unallocated selling, general, and administrative costs Schedule of depreciation expense included in direct expenses and unallocated selling general and administrative costs. Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as Percentage of Gross Accounts Receivable [Table Text Block] Schedule of allowance for contractual discounts and estimated uncompensated care as a percentage of gross accounts receivable Schedule of allowance for contractual discounts and estimated uncompensated care as a percentage of gross accounts receivable. Summary of valuation of short-term investments and financial instruments pricing levels Fair Value Assets and Liabilities Measured On Recurring And Nonrecurring Basis [Table Text Block] Average Coupon Rate Percentage and Average Days to Maturity of Debt [Table Text Block] Average coupon rate percentage and the average days to maturity of debt Average coupon rate percentage and average days to maturity of debt. Components of accumulated other comprehensive loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Condensed Consolidating Balance Sheets Schedule of Condensed Balance Sheet [Table Text Block] Condensed Consolidating Statements of Operations Schedule of Condensed Income Statement [Table Text Block] Condensed Consolidating Statements of Cash Flows Schedule of Condensed Cash Flow Statement [Table Text Block] Provisions for Contractual Discounts and Estimated Uncompensated Care as Percentage of Gross Billings [Abstract] Schedule of provisions for contractual discounts and estimated uncompensated care as a percentage of gross billings Provisions for contractual discounts and estimated uncompensated care as percentage of gross billings. Percentage of Gross Billings Gross billings Percentage of gross billings. Percentage of Provision for Uncompensated Care Provision for uncompensated care Percentage of provision for uncompensated care. Percentage of Provision for Contractual Discounts Provision for contractual discounts Percentage of provision for contractual discounts. Schedule Of Segment Reporting Information By Segment [Table] Statement Business Segments [Axis] Segment [Domain] Medicaid [Member] Medicaid [Member] Medicaid. Medicare [Member] Medicare [Member] Medicare. Insurance [Member] Insurance [Member] Insurance. Self-Pay [Member] Self-Pay [Member] Segment Reporting Information [Line Items] Oil and Gas [Member] Oil and Gas Properties [Member] Air Medical [Member] Air Medical [Member] Air medical. Technical Services [Member] Technical Services [Member] Technical services. Segment Direct Expenses [Abstract] Segment direct expenses Segment direct expenses. Segment Selling General and Administrative Expenses [Abstract] Segment selling, general and administrative expenses Segment selling, general and administrative expenses. Selling General and Administrative Expenses Net Total selling, general and administrative expenses Net selling, general and administrative expenses. Net Direct and Selling General and Administrative Expenses Total direct and selling, general and administrative expenses Net direct and selling, general and administrative expenses. Gains on Disposition of Property and Equipment, and Other Income Other, net Gains on disposition of property and equipment, and other income. Interest Expense, Net Interest expense Interest expense. Allowance for Contractual Discounts and Estimated Uncompensated Care as Percentage of Gross Accounts Receivable [Abstract] Schedule of allowance for contractual discounts and estimated uncompensated care as a percentage of gross accounts receivable Allowance for contractual discounts and estimated uncompensated care as a percentage of gross accounts receivable. Percentage of Gross Accounts Receivable Gross Accounts Receivable Percentage of gross accounts receivable. Percentage of Allowance for Contractual Discounts Allowance for Contractual Discounts Percentage of allowance for contractual discounts. Percentage of Allowance for Uncompensated Care Allowance for Uncompensated Care Percentage of allowance for uncompensated care. Commercial Paper [Member] Commercial Paper [Member] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Investments Investment [Abstract] Money Market Mutual Funds [Member] Money Market Funds [Member] Cost and fair value of our debt investments Available-for-sale Securities, Debt Maturities [Abstract] Due in one year or less, Amortized Cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due within two years, Amortized Cost Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Total, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis Due in one year or less, Fair Value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due within two years, Fair Value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Average Coupon Rate Percentage and Average Days [Abstract] Average coupon rate percentage and the average days to maturity of debt Average coupon rate percentage and the average days. Average Coupon Rate Average Coupon Rate Average coupon rate. Average Days to Maturity Average Days to Maturity Average days to maturity. Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Components of accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Shareholder's Equity (Textual) [Abstract] Shareholder's Equity (Textual) [Abstract] Shareholder's equity. Legal Entity [Axis] Entity [Domain] Parent Company Only (issuer) [Member] Parent Company Only [Member] Parent Company [Member] Guarantor Subsidiaries [Member] Guarantor Subsidiaries [Member] Eliminations [Member] Consolidation, Eliminations [Member] Accounts receivable - net Accounts Receivable, Net, Current Intercompany receivable Due from Related Parties, Current Investment in Subsidiaries and Other Investment in subsidiaries and other Investment in subsidiaries and other. Intercompany payable Due to Related Parties, Current Deferred income taxes and other long-term liabilities Deferred Income Taxes and Other Liabilities, Noncurrent Common Stock and Paid-In Capital Common stock and paid-in capital Common stock and paid-in capital. Management Fees Expenses Management fees Management fees expenses. Equity in net income of consolidated subsidiaries Income (Loss) from Equity Method Investments Proceeds on line of credit, net Proceeds from (Repayments of) Lines of Credit Condensed Consolidating Financial Information (Textual) [Abstract] Condensed Consolidating Financial Information (Textual) [Abstract] Condensed consolidating financial information. Revenue Sources by Payor [Abstract] Schedule of net revenue attributable to Medicaid, Medicare, Insurance, and Self-Pay as a percentage of net Air Medical revenues Revenue sources by payor. Revenue by Payor Percentage Percentage of net Air Medical revenues Revenue by payor percentage. Segment operating revenues Segment Reporting Information, Revenue for Reportable Segment [Abstract] Total Operating income Operating income Operating Income (Loss) Schedule of financial information concerning reportable operating segments Segment Reporting Information, Profit (Loss) [Abstract] Unallocated [Member] Unallocated Amount to Segment [Member] Net segment profit Segment Reporting Information, Operating Income (Loss) [Abstract] Depreciation expense included in direct expenses and unallocated selling, general, and administrative costs Depreciation, Depletion and Amortization [Abstract] Reportable operating segments [Member] Operating Segments [Member] Unrealized gain (loss) on short-term investments Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Changes in pension plan assets and benefit obligations Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Investments in Other Assets [Member] Investments in other assets [Member] Investments in other assets. Short-term investments [Member] Short-term Investments [Member] Corporate bonds and notes [Member] Corporate Debt Securities [Member] Cost Available-for-sale Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Gross Unrealized Gains Unrealized Losses Available-for-sale Securities, Gross Unrealized Losses Fair Value Available-for-sale Securities Schedule of Available-for-sale Securities [Table] Investment [Axis] Investment [Domain] Schedule of Available-for-sale Securities [Line Items] Total, Fair Value Available-for-sale Securities, Debt Securities Available for Sale Continuous Unrealized Loss Position Twelve Months or More [Abstract] Investments in continuous unrealized loss position for twelve months or more Available for sale continuous unrealized loss position twelve months or more. Available for Sale Continuous Unrealized Loss Position Less Than Twelve Months [Table Text Block] Investments in continuous unrealized loss position for less than twelve months Available for sale continuous unrealized loss position less than twelve months. Available for Sale Continuous Unrealized Loss Position Twelve Months or More [Table Text Block] Investments in continuous unrealized loss position for twelve months or more Available for sale continuous unrealized loss position twelve months or more. Investments in continuous unrealized loss position for less than twelve months Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Components of investments Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Cost and fair value of debt investments based on maturities Available-for-sale Securities [Table Text Block] Summary of valuation of short-term investments and financial instruments pricing levels Assets, Fair Value Disclosure [Abstract] Total Available-for-sale Securities, Fair Value Disclosure Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Schedule of Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Senior Notes issued Debt Instrument, Face Amount Interest rate on Senior Notes Debt Instrument, Interest Rate, Stated Percentage Ownership percentage in domestic subsidiaries Equity Method Investment, Ownership Percentage Total aircraft related the contract Number of aircraft operated Number of Aircraft Operated Heavy Transport Aircraft [Member] Heavy Transport Aircraft [Member] Heavy transport aircraft. Medium Aircraft [Member] Medium Aircraft [Member] Medium aircraft. Light Aircraft [Member] Light aircraft Light Aircraft [Member] Long-term Purchase Commitment [Table] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment [Line Items] Aggregate acquisition cost related to aircraft Long-term Purchase Commitment, Amount Deposits on Flight Equipment Deposits on flight equipment Aircraft traded through the credit agreement Property, Plant and Equipment, Number of Aircraft Sold Aircraft Type [Axis] Aircraft Type [Domain] Amount of aircraft traded through the credit agreement Proceeds from Sale of Flight Equipment Two Thousand and Twelve [Member] 2012 [Member] Two thousand and twelve. Two Thousand and Thirteen [Member] 2013 [Member] Two thousand and thirteen. Two Thousand and Fourteen [Member] 2014 [Member] Two thousand and fourteen. Two Thousand and Seventeen [Member] 2017 [Member] Two thousand and seventeen. Additional Contract One [Member] Additional Contract One [Member] Additional contract one. Additional Contract Two [Member] Additional Contract Two [Member] Additional contract two. Facility Lease Commitments Facility lease commitments Facility lease commitments. Lease Commitment for Aircraft Lease commitment for aircraft Lease commitment for aircraft. Operational Lease Payable Operational lease payable at Dec 31,2012 Operational lease payable. Aggregate Commitments Under Operating Leases Aggregate Commitments under operating leases Aggregate commitments under operating leases. Number of Pilots Dismissed by Court Number of pilots dismissed by court Number of pilots dismissed by the court. Aggregate Estimated Probable Liability for Environmental Response Cost Aggregate estimated probable liability for environmental response cost Aggregate estimated probable liability for environmental response cost. Number of year of contract with SRCA Long-term Purchase Commitment, Time Period 8.625% Senior Notes [Member] Senior Notes [Member] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Workmen's Compensation [Member] Workmen's Compensation [Member] Workmen's compensation. Saudi Red Crescent Authority [Member] Saudi Red Crescent Authority [Member] Saudi red crescent authority. Revolving Credit Facility [Member] Revolving Credit Facility [Member] Libor Rate One-month LIBOR plus One month LIBOR plus three percent. Borrowing Base of Eligible Receivables Borrowing base of eligible receivables Credit facility contains a borrowing base of eligible receivables. Credit Facility Borrowings Credit Facility Borrowings Maximum Credit facility borrowings maximum. Sublimit for Issuance of Standby Letters of Credit Sublimit for Issuance of Standby Letters of Credit Sublimit for issuance of standby letters of credit. Senior Notes Due 8.625% Senior Notes due 8.625% Senior notes due. Senior Notes Annual Fixed Interest Rate Periods 8.625% Senior Notes payable periods Senior notes annual fixed interest rate payable semi annually. Credit Facility [Axis] Credit Facility [Domain] Range [Axis] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Debt Instrument [Line Items] Maximum borrowing limit Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing limit term Line of Credit Facility, Expiration Date Facility bears interest at the prime rate plus 100 basis points Line of Credit Facility, Interest Rate at Period End letters of credit were outstanding under the facility Letters of Credit Outstanding, Amount Fair Market Value of Senior Notes Fair market value of our 8.625% Senior Notes Fair market value of our 8.625% senior notes. Senior Notes Purchased 8.625 % Senior Notes Purchased 8.625 % Senior notes purchased Cash paid for interest Interest Expense, Debt Long term Debts Borrowed Long term debts borrowed Long term debts borrowed under credit facility. Weighted Average Effective Interest Rate Weighted average effective interest rate Weighted average effective interest rate. borrowing Base of Eligible Receivables value of Parts Borrowing base of eligible receivables value of parts Borrowing base of eligible receivables value of parts. Senior Notes trustee Purchased 8.625 % Senior Notes trustee purchased 8.625 % Senior notes trustee purchased. Long-term Debt [Member] Long-term Debt [Member] Safety Incentive Plan [Member] Safety Incentive Plan [Member] Safety incentive plan. Long-Term Incentive Plan [Member] Long-Term Incentive Plan [Member] Long-term incentive plan. Safety Incentive Plan Allocated Share-based Compensation Expense Voting and Non-Voting common stock Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Compensation Committee awarded total of time vest Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Performance based restricted stock Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Employee Compensation (Textual) [Abstract] Employee Compensation (Textual) [Abstract] Employee compensation. Accrue Incentive Compensation Expense Accrued Incentive Compensation expense Accrued incentive compensation expense. Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Deferred Bonus and Profit Sharing Plan by Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Executive Officer [Member] Executive Officer [Member] Employee Stock Option [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Aircraft Acquired Number of aircraft acquired Number of aircraft acquired. Commitments and Contingencies (Textual) [Abstract] Commitments And Contingencies (Textual) [Abstract] Commitments and contingencies. Number of Aircrafts Acquire Under Contract Number of aircrafts acquire under contract Number of aircrafts acquire under contract. Aggregate purchase price for aircraft Payments to Acquire Productive Assets Amount of Cost Recovery Denied by Court Amount of cost recovery denied by court Amount of cost recovery denied by court. Condensed Consolidated Statements of Comprehensive Income Schedule of Comprehensive Income (Loss) [Table Text Block] Other Nonoperating Income (Expense) Other (income) expense, net Interest and Non Operating Income Expenses Interest and non operating income (expenses) Interest and non operating income (expenses). Payments for Deposits for Purchase of Productive Assets Payment of deposits on aircraft Payments for deposits for purchase of productive assets. Proceeds from Refund on Deposit on Aircraft Refund of deposits on aircraft Proceeds from refund on deposit on aircraft. Prepaid expenses Prepaid Expense, Current Issuance of restricted stock units Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Hospitals Contracts [Member] Hospitals contracts [Member] Hospitals contracts. Segment Information (Textual) [Abstract] Segment Information (Textual) [Abstract] Segment information. Segment Revenue Segment revenue Segment revenue. Number of Operating States Number of states in which company operates aircrafts Number of operating states. Locations in which Company Operates Aircrafts Total locations in which company operates aircrafts Locations in which company operates aircrafts. Allowance for Contractual Discount Allowance for contractual discount Allowance for contractual discount. Allowance for Uncompensated Care Allowance for uncompensated care Allowance for uncompensated care. Segment Information (Additional Textual) [Abstract] Segment Information (Additional Textual) [Abstract] Two Thousand and Sixteen [Member] 2016 [Member] Two thousand and sixteen. Number of Aircraft Purchased Number of aircraft purchased Number of aircraft purchased. Valuation Accounts (Textual) [Abstract] Valuation Accounts (Textual) [Abstract] Allowance for Contractual Discounts Allowance for contractual discounts Allowance for contractual discounts. Allowance for Uncompensated Care Amount Allowance for uncompensated care Allowance for uncompensated care amount. Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Inventory valuation reserves Inventory Valuation Reserves Working Period with Major Customers Working period with major customers Working period with major customers. Major Customer [Member] Major customer. Major Customer [Member] ENI Petroleum [Member] ENI Petroleum [Member] ENI petroleum. Major Customers [Axis] Name of Major Customer [Domain] One Thousand Nine Hundred Ninety Five Incentive Plan [Member] One Thousand Nine Hundred Ninety Five Incentive Plan Member [Member] One thousand nine hundred ninety five incentive plan. Share available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Time vested restricted stock units Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Condensed Consolidated Statements of Comprehensive Income Operating Expenses Total operating expenses Total operating expenses Commitments and Contingencies (Additional Textual) [Abstract] Commitments and Contingencies (Additional Textual) [Abstract] Debt Covenant Right to Purchase Notes as Percentage of Principal Amount Debt covenant right to purchase notes as percentage of principal amount. Debt covenant right to purchase notes as percentage of principal amount Employee Compensation (Additional Textual) [Abstract] Employee Compensation (Additional Textual) [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period of performance based restricted stock units Performance Based Restricted Stock Units [Member] Performance based restricted stock units [Member] Performance based restricted stock units. Award Type [Axis] Award Type [Domain] Number of Aircrafts Scheduled to be Acquired Number of aircrafts scheduled to be acquired. Number of aircrafts scheduled to be acquired Long-term Debt (Textual) [Abstract] Long-term Debt (Textual) [Abstract] Long Term Debt (Additional Textual) [Abstract] Long Term Debt (Additional Textual) [Abstract]