Document and Entity Information	6 Months Ended
	Jun. 30, 2012
Document And Entity Information [Abstract]
Document Type	6-K
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Entity Registrant Name	Ocean Rig UDW Inc.
Entity Central Index Key	0001447382
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Well Known Seasoned Issuer	No
Entity Common Stock Shares Outstanding	131,696,928
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2