Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- References

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- Definition

The number of businesses acquired by the entity during the period.

+ References

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- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

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- Definition

The amount that is required to be paid, determined under the conditions specified in the contract, if as of the reporting date, the holder of the share has exercised the right to or the shares are mandatorily redeemable after one year from the reporting date or operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109262807&loc=d3e22047-110879

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- Definition

Number of businesses merged during the period.

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- Definition

Number of clinics consolidated with the existing clinics during the period.

+ References

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- Definition

Number of clinics operated during the period.

+ References

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- Definition

Number of clinics operates as a satellite clinic with existing partnerships during the period.

+ References

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- Definition

Number of third party facilities.

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- Definition

Percentage of combined business interest owned during the period.

+ References

No definition available.

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- Definition

Percentage of general partnership interest owned during the period.

+ References

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- Definition

Percentage of limited partnership interest owned during the period.

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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%