v3.6.0.2

Business Segments and Geographic Areas - Summary of Gains on Disposition of Property and Equipment and Other Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Expenditures for long-lived assets | $ 82,871 | $ 56,575 | $ 157,705
Depreciation and amortization | 65,743 | 71,618 | 50,848
Total assets | 1,448,440 | 1,426,333 |
Reportable Operating Segments [Member] | Oil and Gas [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Expenditures for long-lived assets | 59,278 | 32,501 | 119,235
Depreciation and amortization | 40,170 | 42,709 | 29,635
Total assets | 674,788 | 704,472 |
Reportable Operating Segments [Member] | Air Medical [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Expenditures for long-lived assets | 22,429 | 22,685 | 37,317
Depreciation and amortization | 19,716 | 18,177 | 13,067
Total assets | 368,474 | 329,484 |
Reportable Operating Segments [Member] | Technical Services [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Depreciation and amortization | 564 | 518 | 493
Total assets | 9,568 | 7,345 |
Corporate [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Expenditures for long-lived assets | 1,164 | 1,389 | 1,153
Depreciation and amortization | 5,293 | 10,214 | $ 7,653
Total assets | $ 395,610 | $ 385,032 |

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