Working capital (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Working Capital (Abstract)
Excess Of Current Liabilities Over Current Assets	$ 7,011

This element represents the amount of current liabilities that exceeds the balance of current assets.

No definition available.

Name:	orig_ExcessOfCurrentLiabilitiesOverCurrentAssets
Namespace Prefix:	orig_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant