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Basis of Presentation - Additional Information (Detail) (USD $)	1 Months Ended
	Sep. 28, 2012	Mar. 31, 2013 State	Dec. 31, 2012
Basis Of Presentation [Line Items]
Number of states which operates		26
Number of foreign jurisdiction		6
Company owned OMHHF		83.68%
Non-controlling interest		$ 4,491,000	$ 4,261,000
Purchase percentage of additional shares of OMHHF	16.32%
Purchase of additional shares of OMHHF	$ 3,000,000
United States [Member]
Basis Of Presentation [Line Items]
Number of offices providing services		94

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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