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Organization and Significant Accounting Policies - Business Description (Details) | 12 Months Ended |  |  |
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Dec. 31, 2025 state clinic hospital business_segment shares | Nov. 24, 2025 $ / shares | Dec. 31, 2024 shares | Nov. 25, 2024 shares
Segment information |  |  |  |
Number of states in which the entity had operations | state | 39 |  |  |
Number of business segments | business_segment | 3 |  |  |
Common stock, shares issued (in shares) | 124,017,191 |  | 128,962,850 |
Minimum |  |  |  |
Segment information |  |  |  |
Sale of stock, proposed price per share (in dollars per share) | $ / shares |  | $ 16.00 |  |
Maximum |  |  |  |
Segment information |  |  |  |
Sale of stock, proposed price per share (in dollars per share) | $ / shares |  | $ 16.20 |  |
Concentra Shareholders |  |  |  |
Segment information |  |  |  |
Common stock, shares issued (in shares) |  |  |  | 104,093,503
Number of Concentra shares issued for each outstanding share of Company common stock (in shares) |  |  |  | 0.806971
Critical Illness Recovery Hospital |  |  |  |
Segment information |  |  |  |
Number of facilities operated by the entity | hospital | 104 |  |  |
Rehabilitation Hospital |  |  |  |
Segment information |  |  |  |
Number of facilities operated by the entity | hospital | 38 |  |  |
Outpatient Rehabilitation |  |  |  |
Segment information |  |  |  |
Number of outpatient rehabilitation clinics operated by entity | clinic | 1,917 |  |  |

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