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Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	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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