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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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

+ References

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879

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- Definition

Number of clinic practices acquired by the entity.

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- Definition

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

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- Definition

Number of clinics operated during the period.

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- Definition

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

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- Definition

Number of third party facilities.

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- Definition

Percentage of general partnership interest owned during the period.

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- Definition

Percentage of interest acquired in a single clinic practice during the period.

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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
	Dec. 31, 2017 USD ($) Clinic State Facility	Dec. 31, 2016 USD ($) Clinic	Dec. 31, 2015 USD ($)
Organization, Nature of Operations and Basis of Presentation [Abstract]
Number of clinics operated	578
Number of states where clinics are operated \| State	41
Number of third party facilities \| Facility	32
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of general partnership interest owned	1.00%
Percentage of interest acquired	35.00%
Percentage of interest acquired in a single clinic			60.00%
Number of clinic practices acquired	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 \| $	$ 327	$ 69,190	$ 45,974
Minimum [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of limited partnership interest owned	49.00%
Percentage of interest acquired		2.00%	5.00%
Maximum [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of limited partnership interest owned	99.00%
Percentage of interest acquired		35.00%	35.00%
March 2017 Acquisition [Member]
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Percentage of interest acquired	55.00%