Subsequent Event (Details)	Oct. 01, 2018 drilling_unit
Parent Company [Member] \| Saudi Arabia Joint Venture [Member] \| Subsequent Event [Member]
Additional Number Of Rigs Contributed To Joint Venture	2

Additional Number Of Rigs Contributed To Joint Venture

No definition available.

Name:	rdc_AdditionalNumberOfRigsContributedToJointVenture
Namespace Prefix:	rdc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration