Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 497,647	$ 495,781	$ 519,300	$ 1,487,314	$ 1,414,387
Remotely Operated Vehicles [Member]
Segment Reporting Information [Line Items]
Revenues	113,101	120,363	105,045	333,810	298,065
Subsea Products [Member]
Segment Reporting Information [Line Items]
Revenues	150,836	138,910	137,099	418,590	385,491
Subsea Projects [Member]
Segment Reporting Information [Line Items]
Revenues	75,996	75,104	104,972	240,828	239,868
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Revenues	59,274	61,156	62,346	181,119	191,056
Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenues	399,207	395,533	409,462	1,174,347	1,114,480
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Revenues	$ 98,440	$ 100,248	$ 109,838	$ 312,967	$ 299,907