Summary of Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Acute Care Services \| 2020 Acquisition
Goodwill [Line Items]
Adjustments to goodwill	$ 13.5
Behavioral Health Services
Goodwill [Line Items]
Adjustments to goodwill	11.0
Behavioral Health Services \| Foreign Currency Translation Adjustments
Goodwill [Line Items]
Adjustments to goodwill	(5.3)
Behavioral Health Services \| Third Party Minority Ownership Interest
Goodwill [Line Items]
Adjustments to goodwill	$ 16.3

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI https://asc.fasb.org/extlink&oid=123586518&loc=d3e961-128460

Name:	us-gaap_GoodwillPurchaseAccountingAdjustments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration