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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 |

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