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Business Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2022
Segment Reporting [Abstract] |
Schedule of financial data by reportable segment | Certain financial data by reportable segment are summarized as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Net revenues — | ​ | ​ |  | ​ | ​ |  |  | ​ |
Well Intervention | ​ | $ | 524,241 | ​ | $ | 516,564 | ​ | $ | 539,249
Robotics | ​ |  | 191,921 | ​ |  | 137,295 | ​ |  | 178,018
Shallow Water Abandonment | ​ | ​ | 124,810 | ​ | ​ | — | ​ | ​ | —
Production Facilities | ​ |  | 82,315 | ​ |  | 69,348 | ​ |  | 58,303
Intercompany eliminations | ​ |  | (50,187) | ​ |  | (48,479) | ​ |  | (42,015)
Total | ​ | $ | 873,100 | ​ | $ | 674,728 | ​ | $ | 733,555
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Income (loss) from operations — | ​ |  |  | ​ |  |  | ​ |  |
Well Intervention | ​ | $ | (53,056) | ​ | $ | (35,882) | ​ | $ | 26,855
Robotics | ​ |  | 29,981 | ​ |  | 5,762 | ​ |  | 13,755
Shallow Water Abandonment | ​ | ​ | 22,184 | ​ | ​ | — | ​ | ​ | —
Production Facilities | ​ |  | 27,201 | ​ |  | 22,906 | ​ |  | 15,975
Segment operating income (loss) | ​ |  | 26,310 | ​ |  | (7,214) | ​ |  | 56,585
Goodwill impairment (1) | ​ |  | — | ​ |  | — | ​ |  | (6,689)
Change in fair value of contingent consideration | ​ | ​ | (16,054) | ​ | ​ | — | ​ | ​ | —
Corporate, eliminations and other | ​ |  | (55,111) | ​ |  | (41,473) | ​ |  | (36,871)
Total | ​ | $ | (44,855) | ​ | $ | (48,687) | ​ | $ | 13,025
Net interest expense | ​ | ​ | (18,950) | ​ | ​ | (23,201) | ​ | ​ | (28,531)
Other non-operating income (expense), net | ​ | ​ | (11,376) | ​ | ​ | 1,246 | ​ | ​ | 16,889
Income (loss) before income taxes | ​ | $ | (75,181) | ​ | $ | (70,642) | ​ | $ | 1,383
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Capital expenditures — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Well Intervention | ​ | $ | 17,617 | ​ | $ | 2,349 | ​ | $ | 19,523
Robotics | ​ |  | 15,603 | ​ |  | 120 | ​ |  | 257
Shallow Water Abandonment | ​ | ​ | 532 | ​ | ​ | — | ​ | ​ | —
Production Facilities | ​ |  | (1,424) | ​ |  | 6,770 | ​ |  | —
Corporate, eliminations and other | ​ |  | 1,176 | ​ |  | (917) | ​ |  | 464
Total | ​ | $ | 33,504 | ​ | $ | 8,322 | ​ | $ | 20,244
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Depreciation and amortization — | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Well Intervention | ​ | $ | 103,952 | ​ | $ | 107,551 | ​ | $ | 101,756
Robotics | ​ |  | 12,209 | ​ |  | 15,158 | ​ |  | 15,952
Shallow Water Abandonment | ​ | ​ | 8,172 | ​ | ​ | — | ​ | ​ | —
Production Facilities | ​ |  | 18,520 | ​ |  | 19,465 | ​ |  | 15,652
Corporate and eliminations | ​ |  | (167) | ​ |  | (660) | ​ |  | 349
Total | ​ | $ | 142,686 | ​ | $ | 141,514 | ​ | $ | 133,709
(1) | Relates to the impairment of the entire STL goodwill balance (Note 3).
Schedule of intercompany segment revenues | Intercompany segment amounts are derived primarily from equipment and services provided to other business segments. Intercompany segment revenues are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2022 |  | 2021 |  | 2020
Well Intervention | ​ | $ | 16,545 | ​ | $ | 21,521 | ​ | $ | 15,039
Robotics | ​ |  | 33,642 | ​ |  | 26,958 | ​ |  | 26,976
Total | ​ | $ | 50,187 | ​ | $ | 48,479 | ​ | $ | 42,015
​
Schedule of revenue by individually significant geographic location | Revenues by individually significant geographic location are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended December 31,
​ |  | 2022 |  | 2021 |  | 2020
U.S. | ​ | $ | 447,205 | ​ | $ | 232,661 | ​ | $ | 304,563
U.K. | ​ |  | 166,980 | ​ |  | 100,154 | ​ |  | 133,005
Brazil | ​ |  | 81,940 | ​ |  | 154,326 | ​ |  | 208,565
West Africa | ​ | ​ | 87,488 | ​ | ​ | 126,856 | ​ | ​ | 41,840
Other | ​ |  | 89,487 | ​ |  | 60,731 | ​ |  | 45,582
Total | ​ | $ | 873,100 | ​ | $ | 674,728 | ​ | $ | 733,555
​
Schedule of property and equipment, net of accumulated depreciation, by individually significant geographic location | The following table provides our property and equipment, net of accumulated depreciation, by individually significant geographic location where those assets are based (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2022 |  | 2021
U.S. | ​ | $ | 780,803 | ​ | $ | 693,062
U.K. (1) | ​ |  | 625,001 | ​ |  | 713,385
Brazil (2) | ​ |  | 235,811 | ​ |  | 251,194
Other | ​ |  | — | ​ |  | 4
Total | ​ | $ | 1,641,615 | ​ | $ | 1,657,645
(1) | Includes the Q7000 and certain other assets that are based in the U.K. but have operated in West Africa and may also operate in the North Sea, Asia Pacific and other regions.
(2) | Includes the equipment on the Siem Helix 1 chartered vessel and certain other assets that are based in Brazil but are have operated in West Africa and may also operate in the North Sea, Asia Pacific and other regions.
Schedule of total assets by reportable segment | The following table reflects total assets by reportable segment (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2022 |  | 2021
Well Intervention | ​ | $ | 1,796,269 | ​ | $ | 2,012,214
Robotics | ​ |  | 192,694 | ​ |  | 96,249
Shallow Water Abandonment | ​ | ​ | 206,944 | ​ | ​ | —
Production Facilities | ​ |  | 136,382 | ​ |  | 119,004
Corporate and other | ​ |  | 57,049 | ​ |  | 98,561
Total | ​ | $ | 2,389,338 | ​ | $ | 2,326,028

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