Nature of Operations and Basis of Presentation (Details)					1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Oct. 03, 2016 USD ($)	Sep. 15, 2016 USD ($)	Jun. 01, 2016 $ / d	May 23, 2016 USD ($) $ / bbl	Jun. 30, 2016 USD ($)	May 22, 2016 USD ($)	Sep. 30, 2016 USD ($) $ / d	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) drilling_unit $ / bbl $ / d	May 31, 2016 $ / d
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of mobile offshore drilling units | drilling_unit									31
Number of fleet of self-elevating mobile offshore jack-up drilling units | drilling_unit									27
Number of ultra-deepwater drillships | drilling_unit									4
Rowan Relentless [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contingent payments, period of evaluation				12 months					12 months
Revenue						$ 30,500,000		$ 173,200,000
Revenue, canceled contract value								130,900,000
Revenue, fair value of derivative associated with early contract termination agreement				$ 6,200,000				6,200,000
Recognition of previously deferred revenue								5,600,000
Rowan Relentless [Member] | Contingent Consideration Threshold 1 [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Additional contingent payments				$ 10,000,000
Contingent payment, threshold price per barrel (in usd per bbl) | $ / bbl				50					50
Rowan Relentless [Member] | Contingent Consideration Threshold 2 [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Additional contingent payments				$ 20,000,000
Contingent payment, threshold price per barrel (in usd per bbl) | $ / bbl				65					65
Rowan Relentless [Member] | Outstanding Receivables From Early Contract Termination [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Outstanding receivables from early termination of contract				$ 215,000,000
Outstanding receivables from early termination contract, cash received in period					$ 85,000,000		$ 130,000,000
Rowan Viking [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract extension, number of days			270 days
Day rate (in usd per day) | $ / d			275,000							345,528
Rowan Viking [Member] | Change In Contract Day Rate [Member] | Restatement Adjustment [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue								$ (6,300,000)
RowanReliance [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Outstanding receivables from early termination of contract		$ 95,900,000
Day rate (in usd per day) | $ / d							582,000		582,000
Deferred revenue		95,900,000
RowanReliance [Member] | Scenario, Plan [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Day rate (in usd per day) | $ / d							262,000		262,000
RowanReliance [Member] | Outstanding Receivables From Early Contract Termination [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Outstanding receivables from early termination contract, cash received in period		$ 45,000,000
RowanReliance [Member] | Outstanding Receivables From Early Contract Termination [Member] | Scenario, Plan [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Outstanding receivables from early termination contract, cash received in period									$ 19,600,000
Deferred Revenue [Domain] | RowanReliance [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred revenue							$ 57,500,000		57,500,000
Other Liabilities [Member] | RowanReliance [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred revenue							$ 38,400,000		$ 38,400,000
Subsequent Event [Member] | RowanReliance [Member] | Outstanding Receivables From Early Contract Termination [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Outstanding receivables from early termination contract, cash received in period	$ 31,300,000
Cobalt International Energy [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Exclusive provider contract term, years		5 years