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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | Jun. 30, 2015 USD ($) country office state | Dec. 31, 2014 USD ($)
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Organization And Basis Of Presentation [Line Items] |  |
Number of foreign jurisdiction | country | 6 |
Percentage of controlling interest owned by the company in OMHHF | 83.68% |
Noncontrolling interest | $ 6,840 | $ 6,088
United States [Member] |  |
Organization And Basis Of Presentation [Line Items] |  |
Number of Stores | office | 91 |
Number of states in which an entity operates | state | 24 |

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