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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Company owned OMHHF		83.67%
Non-controlling Interest		$ 3,928,000	$ 5,333,000
Intends to purchase non-controlling interest		16.32%
Portion of non-controlling interest purchased		3,000,000
Additional reserves for tax positions, net of tax	1,300,000
Adjustment to income tax expense	1,850,000
Interest expenses after tax basis	$ 588,000

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).

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