Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 536,668	$ 560,810	$ 493,886
Remotely Operated Vehicles [Member]
Segment Reporting Information [Line Items]
Revenues	111,780	116,020	100,346
Subsea Products [Member]
Segment Reporting Information [Line Items]
Revenues	194,838	183,659	128,844
Subsea Projects [Member]
Segment Reporting Information [Line Items]
Revenues	61,455	86,728	89,728
Asset Integrity [Member]
Segment Reporting Information [Line Items]
Revenues	59,132	61,835	60,689
Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenues	427,205	448,242	379,607
Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Revenues	$ 109,463	$ 112,568	$ 114,279