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Segment Information, Geographical Data and Major Customers (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | $ 125,859,000 | $ 105,601,000 |  | $ 248,008,000 | $ 197,094,000 |
Operating profit (loss) | [1] | 8,321,000 | 7,647,000 |  | 12,632,000 | 6,504,000 |
Corporate expenses | [1],[2] | (12,221,000) | (7,910,000) |  | (27,422,000) | (14,694,000) |
Gain (loss) on asset dispositions, net |  | (494,000) | 1,338,000 |  | 776,000 | 3,257,000 |
Asset impairments |  | 0 | (1,215,000) | [3] | 0 | (7,401,000) | [3]
Operating loss |  | (4,394,000) | (140,000) |  | (14,014,000) | (12,334,000) |
Depreciation and amortization |  | 25,038,000 | 12,785,000 |  | 47,970,000 | 24,802,000 |
Additions to properties and equipment |  | 5,757,000 | 4,097,000 |  | 8,873,000 | 5,775,000 |
All Other Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating profit (loss) | [1] | 1,625,000 | 778,000 |  | 3,330,000 | 2,284,000 |
Depreciation and amortization |  | 5,000 | 5,000 |  | 10,000 | 10,000 |
Operating Segments | Americas |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating profit (loss) | [1] | 2,900,000 | 5,681,000 |  | 1,870,000 | 10,592,000 |
Depreciation and amortization |  | 6,515,000 | 3,530,000 |  | 12,776,000 | 6,843,000 |
Additions to properties and equipment |  | 206,000 | 1,230,000 |  | 604,000 | 2,267,000 |
Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating profit (loss) | [1] | (2,127,000) | 625,000 |  | (3,289,000) | (1,628,000) |
Depreciation and amortization |  | 5,319,000 | 2,844,000 |  | 9,769,000 | 5,613,000 |
Additions to properties and equipment |  | 2,180,000 | 1,073,000 |  | 3,639,000 | 1,496,000 |
Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating profit (loss) | [1] | 2,824,000 | (1,142,000) |  | (493,000) | (4,696,000) |
Depreciation and amortization |  | 7,741,000 | 2,239,000 |  | 15,187,000 | 4,043,000 |
Additions to properties and equipment |  | 601,000 | 135,000 |  | 722,000 | 135,000 |
Operating Segments | West Africa Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating profit (loss) | [1] | 3,099,000 | 1,705,000 |  | 11,214,000 | (48,000) |
Depreciation and amortization |  | 5,100,000 | 4,067,000 |  | 9,543,000 | 8,093,000 |
Additions to properties and equipment |  | 1,340,000 |  |  | 1,583,000 | 1,000 |
Corporate |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation and amortization |  | 358,000 | 100,000 |  | 685,000 | 200,000 |
Additions to properties and equipment |  | 1,430,000 | 1,659,000 |  | 2,325,000 | 1,876,000 |
Service | Operating Segments | Americas |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | 35,199,000 | 32,601,000 |  | 70,477,000 | 58,682,000 |
Service | Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | 20,449,000 | 22,406,000 |  | 40,905,000 | 40,794,000 |
Service | Operating Segments | Europe/Mediterranean Sea |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | 35,027,000 | 13,357,000 |  | 63,585,000 | 22,980,000 |
Service | Operating Segments | West Africa Segment |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | 32,966,000 | 35,810,000 |  | 68,336,000 | 69,212,000 |
Other Operating Revenues |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total revenues |  | $ 2,218,000 | $ 1,427,000 |  | $ 4,705,000 | $ 5,426,000 |
[1] | Prior to January 1, 2019, we allocated the costs of certain marine operations related to general and administrative functions, such as marine management, engineering, supply chain management, risk management, fleet human resources and health and safety to the segment general and administrative expenses. Beginning on January 1, 2019 our management elected to modify that process in order to better analyze costs and better align the policies of the two combined companies such that all costs related to those previously allocated functions will remain as corporate general and administrative expenses. This explains the significant increase in corporate expenses that is reflected in the table above for the three and six months ended June 30, 2019.
[2] | Included in corporate expenses for both the three and six months ended June 30, 2019 was $0.5 million and $4.2 million, respectively, of integration costs related to the business combination with GulfMark.
[3] | Refer to Note (14) for additional information regarding asset impairment charges.

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