v3.7.0.1

Revenue Recognition and Valuation Accounts - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance for doubtful accounts | $ 6.1 | $ 6.0 |
Value of uncompensated care services | 2.5 |  | $ 2.5
Estimated cost of providing charity services | 0.6 |  | $ 0.6
Valuation reserves related to obsolescence and slow moving inventory | 17.7 | 17.3 |
Air Medical [Member] |  |  |
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Allowance for contractual discounts against outstanding accounts receivable | 107.6 | 111.9 |
Allowance for uncompensated care against outstanding accounts receivable | $ 48.0 | $ 46.3 |

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