Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Research and development expenses [Abstract]
Research and development allowable costs reported as allowable expenses inception to date	$ 179

Research and development allowable costs reported as allowable expenses inception to date.

No definition available.

Name:	orb_ResearchAndDevelpmentAllowableExpenseInceptionToDate
Namespace Prefix:	orb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant