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Accounts Receivable and Net Revenue - Schedule of Net Patient Service Revenue by Type of Payor (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	100.00%	100.00%
Contracted Managed Care [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	70.00%	71.00%
Government [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	25.00%	24.00%
Other Third-Parties [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	4.00%	4.00%
Private-Pay Patients [Member]
Health Care Organization, Receivable and Revenue Disclosures [Line Items]
Percentage of net patient service revenue	1.00%	1.00%

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- Definition

Percentage of net patient service revenue by type payor.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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