Organization and Basis of Presentation - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014 country	Dec. 31, 2013
Organization And Basis Of Presentation [Line Items]
Number of foreign jurisdiction	6
Percentage of controlling interest owned by the company in OMHHF	83.68%
Non-controlling interest	$ 6,005	$ 5,353
United States [Member]
Organization And Basis Of Presentation [Line Items]
Number of Stores	94
Number of states in which an entity operates	25

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant