| **Segment Data - Disaggregated Revenues, Industrial Solutions Segment (Details) - USD ($) $ in Thousands** | 3 Months Ended | 6 Months Ended |
|------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | $ 179,009      | $ 183,256      | $ 348,116 | $ 383,286 |
| Industrial Solutions                                                                                       |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | 66,791         | 48,075         | 115,758 | 103,931 |
| Industrial Solutions | Rental revenues                                                                     |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | 23,682         | 21,743         | 44,914 | 42,874 |
| Industrial Solutions | Service revenues                                                                    |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | 12,714         | 18,206         | 26,663 | 33,435 |
| Industrial Solutions | Product sales revenues                                                              |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | $ 30,395       | $ 8,126        | $ 44,181 | $ 27,622 |

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.
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| X                                                                                                                                      |
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