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Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 3,869,760 | $ 3,844,628
Goodwill acquired during the period |  | 127 | 5,926
Goodwill divested during the period |  | 0 | 0
Adjustments to goodwill | [1] | 12,828 | 19,206
Goodwill, Ending Balance |  | 3,882,715 | 3,869,760
Acute Care Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 448,415 | 442,462
Goodwill acquired during the period |  | 127 | 5,926
Goodwill divested during the period |  | 0 | 0
Adjustments to goodwill | [1] | (1,521) | 27
Goodwill, Ending Balance |  | 447,021 | 448,415
Behavioral Health Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 3,421,345 | 3,402,166
Goodwill acquired during the period |  | 0 | 0
Goodwill divested during the period |  | 0 | 0
Adjustments to goodwill | [1] | 14,349 | 19,179
Goodwill, Ending Balance |  | $ 3,435,694 | $ 3,421,345
[1] | The increases in the Behavioral Health Services’ goodwill consists primarily of foreign currency translation adjustments.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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