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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Maximum professional liability aggregate policy limit | $ 75,000,000.0 |  |  |
Professional and general liability reserve | 52,600,000 | $ 42,800,000 |  |
Professional and general liability reserve current | 4,700,000 | 5,000,000.0 |  |
Professional and general liability reserve noncurrent | 47,900,000 | 37,800,000 |  |
Insurance receivable | 8,500,000 | 8,200,000 |  |
Insurance receivable - current portion | 3,030,000 | 2,049,000 |  |
Insurance receivable noncurrent | 5,500,000 | 6,100,000 |  |
Workers compensation insurance claims deductible per accident | 500,000 |  |  |
Reserve for workers compensation liability | 20,800,000 | 19,300,000 |  |
Accrued salaries and benefits | 10,000,000.0 | 10,000,000.0 |  |
Other long-term liabilities | 10,800,000 | 9,300,000 |  |
Depreciation expense | 164,000,000.0 | $ 158,800,000 | $ 143,000,000.0 |
Impairment of long-lived assets | $ 54,400,000 |  | 0 |
Number of operating segment | Segment | 2 |  |  |
Number of reporting unit | Segment | 2 |  |  |
Intangible assets impairment charges | $ 0 |  | $ 0 |
U.S. federal corporate tax rate | 21.00% | 21.00% | 35.00% |
Right-of-use assets | $ 546,207,000 |  |  |
Lease liabilities | 581,873,000 |  |  |
ASU 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Right-of-use assets |  |  |  | $ 500,300,000
Lease liabilities |  |  |  | $ 526,600,000
U.K. Facilities [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of long-lived assets |  | $ 12,000,000.0 |  |
Intangible assets impairment charges |  | 325,900,000 |  |
U.S. Facilities [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Intangible assets impairment charges |  | $ 0 |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maximum self insured professional liability limit per claim | $ 3,000,000.0 |  |  |
Maximum [Member] | Discount Rate [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of goodwill, measurement input | 0.105 |  |  |
Maximum [Member] | Building and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life | 50 years |  |  |
Maximum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life | 7 years |  |  |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maximum professional liability retention limit | $ 3,000,000.0 |  |  |
Minimum [Member] | Discount Rate [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment of goodwill, measurement input | 0.100 |  |  |
Minimum [Member] | Building and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life | 10 years |  |  |
Minimum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life | 3 years |  |  |

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