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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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