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Significant Accounting Policies (Narrative) (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2017 | Mar. 01, 2013 | Dec. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment item shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  | 3 |  |
Net service revenues |  |  | $ 195,996,000 | $ 193,987,000 | $ 184,576,000 | $ 190,216,000 | $ 192,376,000 | $ 168,993,000 | $ 148,915,000 | $ 138,507,000 | $ 764,775,000 | $ 648,791,000 | $ 516,647,000
Contract with customer liability |  |  | $ 1,800,000 |  |  |  | 400,000 |  |  |  | $ 1,800,000 | 400,000 |
Percent of fair value of reporting unit excess of carrying value |  |  | 90.00% |  |  |  |  |  |  |  | 90.00% |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  |  | $ 0 | 0 | 0
Goodwill |  |  | $ 469,072,000 |  |  |  | 275,368,000 |  |  |  | 469,072,000 | 275,368,000 | 135,442,000
Impairment of finite-lived intangible assets |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intangibles, net of accumulated amortization |  |  | 71,549,000 |  |  |  | 57,079,000 |  |  |  | 71,549,000 | 57,079,000 |
Deductible component of workers' compensation |  |  |  |  |  |  |  |  |  |  | 400,000 |  |
Letters of credit secure compensation program |  |  | 9,000,000.0 |  |  |  | 10,000,000.0 |  |  |  | 9,000,000.0 | 10,000,000.0 |
Accrued workers’ compensation insurance |  |  | 13,759,000 |  |  |  | 14,143,000 |  |  |  | 13,759,000 | 14,143,000 |
Workers' compensation insurance recovery receivables |  |  | $ 1,860,000 |  |  |  | $ 1,989,000 |  |  |  | $ 1,860,000 | 1,989,000 |
Interest income received |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 2,300,000
Number of stock incentive plans | item |  |  |  |  |  |  |  |  |  |  | 1 |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 6,000,000.0 | 5,800,000 | 4,100,000
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ 2,500,000 | $ 2,000,000.0
Number of stock options included in calculation | shares |  |  | 506,000 |  |  |  | 648,000 |  |  |  | 506,000 | 648,000 | 683,000
Number of dilutive shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 304,000 | 346,000 | 247,000
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 | $ 3,300,000 | $ 2,100,000
Number of dilutive shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 57,000 | 86,000 | 88,000
Shares of restricted stock awards included in calculation | shares |  |  |  |  |  |  |  |  |  |  | 154,000 | 149,000 | 149,000
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Leases termination and renewal option |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Minimum [Member] | Customer and Referral Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Leases termination and renewal option |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  |  | 25 years |  |
Maximum [Member] | Customer and Referral Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, estimated useful lives |  |  |  |  |  |  |  |  |  |  | 10 years |  |
General and Administrative Expenses [Member] | Frisco Corporate Headquarter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease asset, impairment |  |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000,000.0
Accounts receivable, allowance for doubtful accounts |  |  | $ 1,000,000.0 |  |  |  | $ 1,000,000.0 |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 |
Accounting Standards Update 2014-09 [Member] | Subsequent Changes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net service revenues |  |  |  |  |  |  |  |  |  |  |  | 3,000,000.0 | $ 1,300,000
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted |  |  | true |  |  |  |  |  |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  | true |  |  |  |  |  |  |  | true |  |
Accounting Standards Update 2017-04 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted |  |  | true |  |  |  |  |  |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  | true |  |  |  |  |  |  |  | true |  |
Accounting Standards Update 2018-15 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted |  |  | true |  |  |  |  |  |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  | true |  |  |  |  |  |  |  | true |  |
Accounting Standards Update 2019-12 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted |  |  | true |  |  |  |  |  |  |  | true |  |
Change in accounting principle, accounting standards update, immaterial effect |  |  | false |  |  |  |  |  |  |  | false |  |
Change in accounting principle, accounting standards update, adoption date |  |  | Dec. 15, 2020 |  |  |  |  |  |  |  | Dec. 15, 2020 |  |
2013 Home Health Business [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity ownership percentage sold in joint venture | 10.00% | 90.00% |  |  |  |  |  |  |  |  |  |  |
Settlement expense in discontinued operation |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |

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