Business Segment Information - Financial Data By Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Segment Reporting Information [Line Items]
Goodwill	$ 34,940	$ 34,908
Document Period End Date	Mar. 31, 2022
Other adjustments to Income from continuing operations			$ 1,308
Total adjustments to Income from continuing operations		29,549	1,308
Depreciation	$ 30,000	33,000	35,000
Revenue	446,159	466,709	437,553
Income (Loss) from Operations	(1,039)	(12,572)	13,783
Depreciation and amortization	32,019	33,786	36,471
Amortization of Intangible Assets	1,600	900	1,300
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	32,019	33,786	36,471
Accounts Receivable, Allowance for Credit Loss, Writeoff		29,549
Other adjustments to Income from continuing operations			1,308
Total adjustments to Income from continuing operations		29,549	1,308
Depreciation	30,000	33,000	35,000
Amortization of Intangible Assets	1,600	900	1,300
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,901,997	1,962,859
Property, Plant and Equipment, Net	480,259	489,596
Goodwill	34,940	34,908
Income (Loss) from Operations	(1,039)	(12,572)	13,783
Subsea Robotics Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			395
Total adjustments to Income from continuing operations		0	395
Revenue	127,989	134,315	119,119
Income (Loss) from Operations	11,552	21,012	14,619
Depreciation and amortization	19,001	21,029	22,952
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	19,001	21,029	22,952
Other adjustments to Income from continuing operations			395
Total adjustments to Income from continuing operations		0	395
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	11,552	21,012	14,619
Manufactured Products Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			537
Total adjustments to Income from continuing operations		29,549	537
Revenue	82,692	102,940	86,825
Income (Loss) from Operations	2,643	(20,228)	2,753
Depreciation and amortization	3,072	3,111	3,227
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	3,072	3,111	3,227
Accounts Receivable, Allowance for Credit Loss, Writeoff		29,549
Other adjustments to Income from continuing operations			537
Total adjustments to Income from continuing operations		29,549	537
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	2,643	(20,228)	2,753
Offshore Projects Group
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			149
Total adjustments to Income from continuing operations		0	149
Revenue	97,397	85,356	89,234
Income (Loss) from Operations	666	6,754	8,813
Depreciation and amortization	7,297	7,405	7,125
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	7,297	7,405	7,125
Other adjustments to Income from continuing operations			149
Total adjustments to Income from continuing operations		0	149
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	666	6,754	8,813
Integrity Managements & Digital Solutions Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			217
Total adjustments to Income from continuing operations		0	217
Revenue	56,570	60,469	54,048
Income (Loss) from Operations	3,508	6,015	2,474
Depreciation and amortization	1,030	1,091	1,124
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	1,030	1,091	1,124
Other adjustments to Income from continuing operations			217
Total adjustments to Income from continuing operations		0	217
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	3,508	6,015	2,474
Aerospace and Defense Technologies Member
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations			10
Total adjustments to Income from continuing operations		0	10
Revenue	81,511	83,629	88,327
Income (Loss) from Operations	11,844	10,562	16,839
Depreciation and amortization	656	676	1,276
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	656	676	1,276
Other adjustments to Income from continuing operations			10
Total adjustments to Income from continuing operations		0	10
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	11,844	10,562	16,839
Energy Services and Products Member
Segment Reporting Information [Line Items]
Revenue	364,648	383,080	349,226
Income (Loss) from Operations	18,369	13,553	28,659
Depreciation and amortization	30,400	32,636	34,428
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	30,400	32,636	34,428
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	18,369	13,553	28,659
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(31,252)	(36,687)	(31,715)
Depreciation and amortization	963	474	767
Segment Reporting, Other Significant Reconciling Item [Line Items]
Depreciation and amortization	963	474	767
Segment Reporting, Asset Reconciling Item [Line Items]
Income (Loss) from Operations	$ (31,252)	(36,687)	$ (31,715)
Unallocated Expense Member
Segment Reporting Information [Line Items]
Total adjustments to Income from continuing operations		0
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total adjustments to Income from continuing operations		$ 0