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Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 3,825,157 | $ 3,784,106
Goodwill acquired during the period |  | 45,090 | 80
Goodwill divested during the period |  | (2,135) |
Adjustments to goodwill | [1] | (23,484) | 40,971
Goodwill, Ending Balance |  | 3,844,628 | 3,825,157
Acute Care Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 441,511 | 440,294
Goodwill acquired during the period |  | 917 | 80
Goodwill divested during the period |  | 0 |
Adjustments to goodwill | [1] | 34 | 1,137
Goodwill, Ending Balance |  | 442,462 | 441,511
Behavioral Health Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 3,383,646 | 3,343,812
Goodwill acquired during the period |  | 44,173 | 0
Goodwill divested during the period |  | (2,135) |
Adjustments to goodwill | [1] | (23,518) | 39,834
Goodwill, Ending Balance |  | $ 3,402,166 | $ 3,383,646
[1] | The increase/(decrease) in the Behavioral Health Services’ goodwill consists primarily of foreign currency translation adjustments.

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- Definition Amount after accumulated impairment loss 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 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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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=108376223&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=108376223&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=108376223&loc=d3e13816-109267 + Details
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- Details
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