Business Segment Information - Financial Data By Business Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Goodwill	$ 73,987,000	$ 405,079,000
Write-off Equipment and Intangibles	7,300,000	45,000,000
Depreciation, Depletion and Amortization	356,196,000
Inventory Write-down	0	21,000,000	$ 0
Impairment of Long-Lived Assets Held-for-use	68,763,000	17,000,000
Goodwill, Impairment Loss	$ 303,005,000	15,000,000	0
Document Period End Date	Mar. 31, 2020
Other adjustments to Income from continuing operations	$ 386,000,000	252,000,000
Other Asset Impairment Charges	69,000,000
Impairment property plant equipment	51,578,000	143,000,000
Depreciation	43,000,000	48,000,000	49,000,000
Revenue	536,668,000	560,810,000	493,886,000
Income (Loss) from Operations	(380,757,000)	(254,170,000)	(21,714,000)
Depreciation and amortization, including goodwill impairment	356,196,000	110,070,000	52,486,000
Amortization of Intangible Assets	2,600,000	3,000,000.0	3,900,000
Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenue	427,205,000	448,242,000	379,607,000
Income (Loss) from Operations	(337,523,000)	(225,979,000)	3,121,000
Depreciation and amortization, including goodwill impairment	342,910,000	108,105,000	50,497,000
Remotely Operated Vehicles [Member]
Segment Reporting Information [Line Items]
Goodwill	23,609,000	24,423,000
Goodwill, Impairment Loss		5,700,000
Other adjustments to Income from continuing operations	700,000	23,000,000
Revenue	111,780,000	116,020,000	100,346,000
Income (Loss) from Operations	9,066,000	(18,660,000)	1,418,000
Depreciation and amortization, including goodwill impairment	25,725,000	32,043,000	27,990,000
Subsea Products [Member]
Segment Reporting Information [Line Items]
Goodwill	39,924,000	99,409,000
Goodwill, Impairment Loss	51,000,000	19,000,000
Other adjustments to Income from continuing operations	108,000,000	25,000,000
Revenue	194,838,000	183,659,000	128,844,000
Income (Loss) from Operations	(91,858,000)	(10,325,000)	(476,000)
Depreciation and amortization, including goodwill impairment	62,454,000	30,992,000	12,991,000
Subsea Projects [Member]
Segment Reporting Information [Line Items]
Goodwill		131,768,000
Goodwill, Impairment Loss	130,000,000	6,100,000
Other adjustments to Income from continuing operations	146,000,000	153,000,000
Revenue	61,455,000	86,728,000	89,728,000
Income (Loss) from Operations	(145,290,000)	(148,075,000)	2,892,000
Depreciation and amortization, including goodwill impairment	143,346,000	14,541,000	7,882,000
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Goodwill		127,637,000
Goodwill, Impairment Loss	111,000,000	14,000,000
Other adjustments to Income from continuing operations	112,000,000	49,000,000
Revenue	59,132,000	61,835,000	60,689,000
Income (Loss) from Operations	(109,441,000)	(48,919,000)	(713,000)
Depreciation and amortization, including goodwill impairment	111,385,000	30,529,000	1,634,000
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	10,454,000	21,842,000
Goodwill, Impairment Loss	11,000,000
Other adjustments to Income from continuing operations	18,000,000	1,600,000
Revenue	109,463,000	112,568,000	114,279,000
Income (Loss) from Operations	(10,585,000)	5,270,000	9,599,000
Depreciation and amortization, including goodwill impairment	12,178,000	766,000	830,000
Other Segments [Member]
Segment Reporting Information [Line Items]
Other adjustments to Income from continuing operations	6,600,000	12,000,000
Unallocated Expenses [Member]
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(32,649,000)	(33,461,000)	(34,434,000)
Depreciation and amortization, including goodwill impairment	1,108,000	1,199,000	$ 1,159,000
Energy Service [Member]
Segment Reporting Information [Line Items]
Goodwill	$ 63,533,000	$ 383,237,000