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Assets Held for Sale (Details) $ in Thousands | Jun. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($)
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale | $ 111,682 | $ 16,562
Canada Drilling segment holdings | Disposal Group, Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Assets held for sale | $ 95,000 |
Number of land based drilling | item | 35 |

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