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Organization and Basis of Presentation - Additional Information (Detail) (USD $) | 0 Months Ended |  |
--- | --- | --- | ---
Sep. 28, 2012 | Mar. 31, 2014 Jurisdictions | Dec. 31, 2013
Organization And Basis Of Presentation [Line Items] |  |  |
Number of foreign jurisdiction |  | 5 |
Percentage of controlling interest owned by the company in OMHHF |  | 83.68% |
Non-controlling interest |  | $ 5,549,000 | $ 5,353,000
Percentage of additional shares purchased from OMHHF | 16.32% |  |
Purchase of additional shares of OMHHF | $ 3,000,000 |  |
United States [Member] |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |
Number of offices providing services |  | 96 |
Number of states in which an entity operates |  | 25 |

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