NATURE OF OPERATIONS (Details)	Sep. 30, 2016 drilling_unit drillship
Mobile Offshore Drilling Units [Member]
Property, Plant and Equipment [Line Items]
Number of drilling units \| drilling_unit	10
Construction in Progress, Ultra-Deepwater Drillships [Member]
Property, Plant and Equipment [Line Items]
Number of drilling units \| drillship	2

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration