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Organization, Nature of Operations and Basis of Presentation (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 Business | Dec. 31, 2018 USD ($) Clinic State Facility | Dec. 31, 2017 USD ($) Clinic | Dec. 31, 2016 Clinic | Mar. 23, 2017
Organization, Nature of Operations and Basis of Presentation [Abstract] |  |  |  |  |
Number of clinics operated |  | 591 |  |  |
Number of states where clinics are operated | State |  | 42 |  |  |
Number of third party facilities | Facility |  | 28 |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract] |  |  |  |  |
Percentage of interest acquired |  |  | 35.00% |  |
Percentage of general partnership interest owned |  | 1.00% |  |  |
Number of clinic practices acquired |  | 5 | 2 | 2 |
Number of clinics consolidated with an existing clinic |  |  | 1 |  |
Number of clinics that operate as a satellite clinic with existing partnerships |  |  | 1 |  |
Mandatorily redeemable non-controlling interests | $ |  | $ 0 | $ 327 |  |
Minimum [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract] |  |  |  |  |
Percentage of interest acquired |  | 5.50% |  | 2.00% |
Percentage of limited partnership interest owned |  | 49.00% |  |  |
Maximum [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract] |  |  |  |  |
Percentage of interest acquired |  | 35.00% |  | 35.00% |
Percentage of limited partnership interest owned |  | 99.00% |  |  |
March 2017 Acquisition [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract] |  |  |  |  |
Percentage of interest acquired |  | 55.00% |  |  |
Industrial Injury Prevention [Member] |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net [Abstract] |  |  |  |  |
Percentage of interest acquired | 65.00% |  |  |  | 55.00%
Number of businesses merged | Business | 2 |  |  |  |
Percentage of combined business interest owned | 59.45% |  |  |  |

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