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Impairments and (Gain) Loss on Assets Held for Sale - Additional Information (Details) $ in Thousands | 3 Months Ended
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Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) crane drydock | Mar. 31, 2020 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets |  | $ 22,750 |
Number of drydocks | drydock |  | 2 |
Gain (loss) on sale of assets |  | $ 6 | $ 5
Held for sale |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Number of cranes | crane |  | 3 |
Proceeds from the sale of assets held for sale |  |  | $ 1,100
Gain (loss) on sale of assets |  | $ 0 |
Held for sale | Shipyard |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Impairments of assets |  | 22,800 |
Transaction costs |  | $ 700 |
Held for sale | Shipyard | Forecast |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |
Additional loss | $ 2,000 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Estimate of reasonably possible loss exposure in excess of amount accrued for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14394-108349 + Details
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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=121586364&loc=d3e3602-108585 + Details
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