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v3.19.2

Nature of Operations and Basis of Presentation (Details) $ / shares in Units, shares in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 11, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) drilling_unit segment | Apr. 10, 2019 USD ($) $ / shares | Jan. 28, 2019 $ / shares | Jan. 01, 2019 USD ($)
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Operating Lease, Liability |  | $ 13,700,000 |  |  | $ 14,500,000
Number of Operating Segments | segment |  | 3 |  |  |
Number of ultra-deepwater drillships | drilling_unit |  | 4 |  |  |
Number of fleet of self-elevating mobile offshore jack-up drilling units | drilling_unit |  | 21 |  |  |
Operating Lease, Right-of-Use Asset |  | $ 12,300,000 |  |  | $ 13,200,000
Number of jackups leased by ARO |  | 9 |  |  |
Contracts between ARO and Saudi Aramco |  | 2 |  |  |
Saudi Arabia Joint Venture [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Number of fleet of self-elevating mobile offshore jack-up drilling units | drilling_unit |  | 7 |  |  |
Period Of Joint Venture Funding Of Drilling Rigs |  | 10 years |  |  |
Saudi Arabia Joint Venture [Member] | Saudi Aramco [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Parent Company [Member] | Saudi Arabia Joint Venture [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Ensco [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.10 |
Subsequent Event [Member] | Ensco [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Shares Received by Rowan Shareholders for Rowan Ensco merge | $ / shares | $ 2.750 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares | 88.3 |  |  |  |
Subsequent Event [Member] | Rowan [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred | $ 1,400,000,000 |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  |  | $ 43.67 |  |
Share Price | $ / shares |  |  | $ 15.88 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | $ 2,600,000 |  |  |  |
Maximum [Member] | Saudi Arabia Joint Venture [Member] |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Number Of Drilling Rigs To Be Purchased By Joint Venture | drilling_unit |  | 20 |  |  |

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