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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 23, 2015 USD ($) | Jan. 31, 2015 Drilling_Units | Jun. 30, 2018 USD ($) Rigs Contract | Dec. 31, 2017 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |
Number of new building contracts | Contract |  |  | 8 |
Purchase commitments |  |  | $ 1,683 | $ 1,700
Number of new building contracts for jack up rigs | Rigs |  |  | 8 |
Rosneft Transaction [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Loss contingency, estimated backlog of transaction | $ 4,100 |  |  |
Patent Infringement [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Number of drilling rigs | Drilling_Units |  | 1 |  |

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- Details
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- Details
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