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Assets Held for Sale - Additional Information (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) crane Deckbarge | Jun. 30, 2019 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Gain (loss) on sale of assets |  |  | $ 5,000 | $ 565,000
Held for sale |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |
Number of cranes | crane |  |  | 3 |
Number of deck barges | Deckbarge |  |  | 1 |
Proceeds from sale of bending roll machines | $ 0 | $ 0 | $ 1,100,000 | 400,000
Gain (loss) on sale of assets | $ 0 | $ 0 | $ 0 | 400,000
Impairment of long-lived assets to be disposed of |  |  |  | $ 300,000

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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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