v3.6.0.2

Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) Aircraft | Dec. 31, 2015 USD ($) Aircraft | Dec. 31, 2014 USD ($) Aircraft
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of stock owned by CEO |  |  |  |  |  |  |  |  | 70.90% |  |
Maturities Period of liquid investments |  |  |  |  |  |  |  |  | Three months or less |  |
Valuation reserves related to obsolescence and slow moving inventory | $ 17,300,000 |  |  |  | $ 15,400,000 |  |  |  | $ 17,300,000 | $ 15,400,000 |
Gain or loss on sale of assets | (504,000) | $ (85,000) | $ 4,298,000 | $ (359,000) | (577,000) | $ 165,000 | $ 66,000 | $ 7,000 | 3,350,000 | (339,000) | $ (848,000)
Impairments of assets |  |  |  |  |  |  |  |  | 407,000 |  | 10,508,000
Insurance retention per claim |  |  |  |  |  |  |  |  | 250,000 |  |
Accrued liabilities related to health care claims | 1,900,000 |  |  |  | 1,900,000 |  |  |  | 1,900,000 | 1,900,000 |
Amount deductible per incident |  |  |  |  |  |  |  |  | 500,000 |  |
Accrued expense related to workers compensation claims | 2,500,000 |  |  |  | 2,600,000 |  |  |  | 2,500,000 | 2,600,000 |
Amounts paid to offshore insurance captive |  |  |  |  |  |  |  |  | 600,000 | 1,000,000 |
Allowance for contractual discounts against outstanding accounts receivable | 111,900,000 |  |  |  | 103,600,000 |  |  |  | 111,900,000 | 103,600,000 | 96,600,000
Allowance for uncompensated care against outstanding accounts receivable | 46,300,000 |  |  |  | 41,900,000 |  |  |  | 46,300,000 | 41,900,000 | 41,900,000
Value of uncompensated care services | 8,800,000 |  |  |  | 9,300,000 |  |  |  | 8,800,000 | 9,300,000 | 9,100,000
Estimated cost of providing charity services | 1,900,000 |  |  |  | 2,000,000 |  |  |  | $ 1,900,000 | 2,000,000 | $ 2,100,000
Percentage of reserved category of self pay |  |  |  |  |  |  |  |  | 100.00% |  |
Allowance for doubtful accounts | $ 6,000,000 |  |  |  | $ 5,200,000 |  |  |  | $ 6,000,000 | $ 5,200,000 |
Percentage of consolidated operating revenues |  |  |  |  |  |  |  |  | 24.00% | 26.00% | 30.00%
Percentage of trade receivables | 16.00% |  |  |  | 15.00% |  |  |  | 16.00% | 15.00% |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrealized losses recorded |  |  |  |  |  |  |  |  | $ 300,000 |  |
Light Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairments of assets |  |  |  |  |  |  |  |  | 400,000 | $ 0.0 |
Medium Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairments of assets |  |  |  |  |  |  |  |  |  |  | $ 10,500,000
Oil and Gas [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  |  |  |  |  |  |  | 15,000,000 | 3,700,000 |
Gain on disposal of assets |  |  |  |  |  |  |  |  | $ 3,300,000 |  |
Carrying value of aircraft |  |  |  |  | $ 3,700,000 |  |  |  |  | 3,700,000 |
Gain or loss on sale of assets |  |  |  |  |  |  |  |  |  | $ 0 |
Oil and Gas [Member] | Light Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | Aircraft |  |  |  |  |  |  |  |  | 12 | 8 |
Carrying value of aircraft | $ 1,800,000 |  |  |  |  |  |  |  | $ 1,800,000 |  |
Number of Aircraft impaired | Aircraft |  |  |  |  |  |  |  |  | 2 |  |
Oil and Gas [Member] | Light Aircraft [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Market value of aircraft | 1,400,000 |  |  |  |  |  |  |  | $ 1,400,000 |  |
Oil and Gas [Member] | Medium Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | Aircraft |  |  |  |  |  |  |  |  | 11 |  |
Oil and Gas [Member] | Fixed Wing Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of aircraft sold | Aircraft |  |  |  |  |  |  |  |  |  | 6 |
Air Medical [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain or loss on sale of assets |  |  |  |  |  |  |  |  |  | $ (300,000) |
Allowance for contractual discounts against outstanding accounts receivable | 111,900,000 |  |  |  | 103,600,000 |  |  |  | $ 111,900,000 | 103,600,000 | 96,600,000
Allowance for uncompensated care against outstanding accounts receivable | $ 46,300,000 |  |  |  | $ 41,900,000 |  |  |  | $ 46,300,000 | $ 41,900,000 | 41,900,000
Air Medical [Member] | Medium Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of aircraft |  |  |  |  |  |  |  |  |  |  | $ 16,500,000
Number of Aircraft impaired | Aircraft |  |  |  |  |  |  |  |  |  |  | 13
Market value of aircraft |  |  |  |  |  |  |  |  |  |  | $ 6,000,000
Air Medical and Technical Services [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated operating revenues |  |  |  |  |  |  |  |  | 5.00% | 9.00% |
Percentage of trade receivables | 13.00% |  |  |  | 15.00% |  |  |  | 13.00% | 15.00% |
Aircraft [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Salvage value of aircraft | 54.00% |  |  |  |  |  |  |  | 54.00% |  |
Aircraft [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Salvage value of aircraft | 25.00% |  |  |  |  |  |  |  | 25.00% |  |
Flight Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 15 years |  |
Flight Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 5 years |  |
Other Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 10 years |  |
Other Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 3 years |  |
Leasehold Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 10 years |  |
Leasehold Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 6 years |  |

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