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Acquisitions of Businesses (Details) $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) Clinic Installment | Apr. 11, 2019 USD ($) State Location | Aug. 31, 2018 USD ($) Clinic Installment | Apr. 30, 2018 USD ($) Business | Oct. 31, 2017 USD ($) Clinic Installment Contract | Jun. 30, 2017 USD ($) Clinic Installment | May 31, 2017 USD ($) Clinic Installment | Jan. 01, 2017 USD ($) Clinic Installment | Dec. 31, 2019 USD ($) Clinic | Dec. 31, 2018 USD ($) Clinic | Dec. 31, 2017 USD ($) Clinic | Mar. 31, 2017 | Jan. 02, 2017 | Dec. 31, 2016 USD ($)
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  |  |  | 1 | 5 | 2 |  |  |
Number of clinics consolidated with an existing clinic | Clinic |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 |  |  |
Number of clinics that operate as a satellite clinic with existing partnerships | Clinic |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 |  |  |
Cash paid, net of cash acquired |  |  | $ 30,597 |  |  | $ 16,367 |  |  |  |  | $ 30,597 | $ 16,367 | $ 36,682 |  |  |
Net of cash acquired |  |  |  |  |  | 372 |  |  |  |  | $ 900 |  | 2,297 |  |  |
Payable to shareholders of seller |  |  | 486 |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  | 4,300 |  |  | 950 |  |  |  |  |  |  | 2,150 |  |  |
Total consideration |  |  | 35,383 |  |  | 17,317 |  |  |  |  |  |  | 38,832 |  |  |
Estimated fair value of net tangible assets acquired: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  | 2,604 |  |  | 1,633 |  |  |  |  |  |  | 5,853 |  |  |
Total non-current assets |  |  | 3,639 |  |  | 305 |  |  |  |  |  |  | 1,527 |  |  |
Total liabilities |  |  | (4,350) |  |  | (525) |  |  |  |  |  |  | (2,865) |  |  |
Net tangible assets acquired |  |  | 1,893 |  |  | 1,413 |  |  |  |  |  |  | 4,515 |  |  |
Referral relationships |  |  | 3,000 |  |  | 2,926 |  |  |  |  |  |  | 4,250 |  |  |
Non-compete |  |  | 1,290 |  |  | 298 |  |  |  |  |  |  | 660 |  |  |
Tradename |  |  | 4,100 |  |  | 990 |  |  |  |  |  |  | 6,850 |  |  |
Goodwill |  |  | 31,330 |  |  | 19,835 |  |  |  |  |  |  | 46,722 |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  |  | (6,230) |  |  | (8,145) |  |  |  |  |  |  | (13,883) |  |  |
Fair value of non-controlling interest (originally classified as mandatorily redeemable non-controlling interests) |  |  |  |  |  |  |  |  |  |  |  |  | (10,282) |  |  |
Total consideration |  |  | $ 35,383 |  |  | $ 17,317 |  |  |  |  |  |  | $ 38,832 |  |  |
Referral Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  |  |  | 11 years | 10 years 6 months 14 days | 10 years 1 month 6 days |  |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of acquired intangibles |  |  |  |  |  |  |  |  |  |  | 6 years | 6 years | 5 years 1 month 28 days |  |  |
September 2019 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Sep. 30, 2019 |  |  |  |  |
Percentage of interest acquired |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2019 Acquisition [Member] | September 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2019 Acquisition [Member] | September 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  |  |
April 2019 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Apr. 11, 2019 |  |  |  |  |
Number of states of network services | State |  |  | 45 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of onsite client locations | Location |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  | 76.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  | $ 18,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price for the acquired clinic practices |  |  | $ 23,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  | $ 22,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Net of cash acquired |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |
Payable to shareholders of seller |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  | 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |
IIPS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  | 55.00% |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  | $ 8,600 |  |  |  |  |  |  |  |  |  |
Number of businesses merged | Business |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Percentage of combined business interest owned |  |  |  |  |  | 59.45% |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired | [1] |  | 18,427 |  |  |  |  |  |  |  |  |  |  |  |  |
Payable to shareholders of seller | [1] |  | 486 |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  | 4,000 | [1] |  | $ 400 |  |  |  |  |  |  |  |  |  |
Total consideration | [1] |  | 22,913 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current assets | [1] |  | 1,907 |  |  |  |  |  |  |  |  |  |  |  |  |
Total non-current assets | [1] |  | 611 |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities | [1] |  | (1,504) |  |  |  |  |  |  |  |  |  |  |  |  |
Net tangible assets acquired | [1] |  | 1,014 |  |  |  |  |  |  |  |  |  |  |  |  |
Referral relationships | [1] |  | 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-compete | [1] |  | 590 |  |  |  |  |  |  |  |  |  |  |  |  |
Tradename | [1] |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | [1] |  | 17,309 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) | [1] |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | [1] |  | 22,913 |  |  |  |  |  |  |  |  |  |  |  |  |
Clinic Practice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, net of cash acquired |  |  | 12,170 |  |  |  |  |  |  |  |  |  |  |  |  |
Payable to shareholders of seller |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  | 300 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | 12,470 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of net tangible assets acquired: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current assets |  |  | 697 |  |  |  |  |  |  |  |  |  |  |  |  |
Total non-current assets |  |  | 3,028 |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities |  |  | (2,846) |  |  |  |  |  |  |  |  |  |  |  |  |
Net tangible assets acquired |  |  | 879 |  |  |  |  |  |  |  |  |  |  |  |  |
Referral relationships |  |  | 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Non-compete |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |
Tradename |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 14,021 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of non-controlling interest (classified as redeemable non-controlling interests) |  |  | (6,230) |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | $ 12,470 |  |  |  |  |  |  |  |  |  |  |  |  |
August 2018 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Aug. 31, 2018 |  |  |  |  |
Percentage of interest acquired |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  | $ 7,300 |  |  |  |  |  |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Seller notes |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
August 2018 Acquisition [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |
August 2018 Acquisition [Member] | August 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |  |
January 2017 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Jan. 01, 2017 |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% | 70.00%
Number of clinics | Clinic |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  |  |  | $ 10,700 |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Seller notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500
January 2017 Acquisition [Member] | January 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |
January 2017 Acquisition [Member] | January 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |
May 2017 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | May 31, 2017 |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  |  | $ 2,300 |  |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Seller notes |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |
May 2017 Acquisition [Member] | May 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  |  | 125 |  |  |  |  |  |  |
May 2017 Acquisition [Member] | May 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  |  | $ 125 |  |  |  |  |  |  |
June 2017 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2017 |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  | $ 15,800 |  |  |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Seller notes |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
June 2017 Acquisition [Member] | June 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |
June 2017 Acquisition [Member] | June 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |
October 2017 Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  |  |  | Oct. 31, 2017 |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |
Business acquisition number of installments for payment of purchase consideration | Installment |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of management contracts | Contract |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Seller notes |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
October 2017 Acquisition [Member] | October 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  | 250 |  |  |  |  |  |  |  |  |
October 2017 Acquisition [Member] | October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |  |  |
Acquisition of Five Clinic Practices [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics | Clinic |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Aggregate purchase price for the acquired clinic practices |  |  |  |  |  |  |  |  |  |  |  | 850 |  |  |  |
Seller notes |  |  |  |  |  |  |  |  |  |  |  | $ 150 |  |  |  |
Acquisition of Five Clinic Practices [Member] | August 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest accrued |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |
[1] | Industrial injury prevention services

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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References 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 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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