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Acquisitions & Dispositions - Narrative (Details) $ in Thousands, £ in Millions			3 Months Ended
	Oct. 05, 2018 USD ($)	Jul. 02, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Jan. 03, 2018 USD ($)	Jan. 03, 2018 GBP (£)
Business Acquisition [Line Items]
Reduction to contingent cash liability			$ 4,629	$ 0
Gain on contribution of subsea rentals business			0	33,506
Houston Global Heat Transfer LLC
Business Acquisition [Line Items]
Percentage of ownership acquired	100.00%
Acquisition of businesses, net of cash acquired	$ 57,300
Reduction to contingent cash liability			$ 4,600
ESP Completion Technologies LLC
Business Acquisition [Line Items]
Payments to acquire business		$ 8,000
Subsea Rentals
Business Acquisition [Line Items]
Cash consideration received in sale of business | £						£ 2.7
Note receivable received as consideration in sale of business | £						£ 3.0
Gain on contribution of subsea rentals business				$ 33,500
Subsea rental assets carry value					$ 18,100
Ashtead Technology | Subsea Rentals
Business Acquisition [Line Items]
Equity interest received in sale of business					40.00%	40.00%
Equity ownership interest fair value					$ 43,800

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