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Segment Information - Depreciation and Amortization Expense Included in Direct Expenses and Unallocated Selling, General, and Administrative Costs (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Reportable operating segments [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||
| Depreciation and Amortization Expenses | $ 9,326 | $ 8,485 | $ 28,164 | $ 24,721 |
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Reportable operating segments [Member] | Oil And Gas [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||
| Depreciation and Amortization Expenses | 6,403 | 6,018 | 19,707 | 17,545 |
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Reportable operating segments [Member] | Air Medical [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||
| Depreciation and Amortization Expenses | 2,873 | 2,453 | 8,376 | 7,118 |
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Reportable operating segments [Member] | Technical Services [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||
| Depreciation and Amortization Expenses | 50 | 14 | 81 | 58 |
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Unallocated S,G & A [Member]
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| Segment Reporting, Asset Reconciling Item [Line Items] | ||||
| Depreciation and Amortization Expenses | $ 1,235 | $ 270 | $ 3,260 | $ 815 |