Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Settlement, litigation and other related charges	$ 9,820ocr_LitigationAndOtherProfessionalFees	$ 7,052ocr_LitigationAndOtherProfessionalFees

Amount charged against earnings for litigation related settlements and professional expenses primarily in connection with specifically identified legal proceedings.

No definition available.

Name:	ocr_LitigationAndOtherProfessionalFees
Namespace Prefix:	ocr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration