| **Segment Data - Disaggregated Revenues, Industrial Solutions Segment (Details) - USD ($) $ in Thousands** | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Total revenues                                                                                             | $ 44,207       | $ 57,262       | $ 159,965 | $ 161,193 |
| Industrial Solutions                                                                                       |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Rental revenues                                                                                            | 18,873         | 20,370         | 63,787 | 63,244 |
| Total revenues                                                                                             | 44,207         | 57,262         | 159,965 | 161,193 |
| Industrial Solutions | Service revenues                                                                    |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Revenues                                                                                                   | 13,535         | 17,695         | 40,198 | 51,130 |
| Industrial Solutions | Product sales revenues                                                              |           |           |   |   |
| **Disaggregation of Revenue [Line Items]**                                                                 |           |           |   |   |
| Revenues                                                                                                   | $ 11,799       | $ 19,197       | $ 55,980 | $ 46,819 |

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.
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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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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