Basis of Presentation and Nature of Operations (Details)	9 Months Ended
	Sep. 30, 2014 drilling_unit
Gas and Oil Acreage [Line Items]
Number of fleet of self-elevating mobile offshore jack-up drilling units	30
Number of ultra-deepwater drill ships under construction	2
Rowan Renaissance [Member]
Gas and Oil Acreage [Line Items]
Ultra-deepwater drill ships expected to be completed, contract term after delivery	3 years
Rowan Resolute [Member]
Gas and Oil Acreage [Line Items]
Ultra-deepwater drill ships expected to be completed, contract term after delivery	3 years
Rowan Reliance [Member]
Gas and Oil Acreage [Line Items]
Ultra-deepwater drill ships expected to be completed, contract term after delivery	3 years
Rowan Relentless [Member]
Gas and Oil Acreage [Line Items]
Ultra-deepwater drill ships expected to be completed, contract term after delivery	2 years