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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, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 3,784,106 | $ 3,596,114
Goodwill acquired during the period |  | 80 | 234,658
Adjustments to goodwill | [1] | 40,971 | (46,666)
Goodwill, Ending Balance |  | 3,825,157 | 3,784,106
Acute Care Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 440,294 | 389,507
Goodwill acquired during the period |  | 80 | 50,897
Adjustments to goodwill | [1] | 1,137 | (110)
Goodwill, Ending Balance |  | 441,511 | 440,294
Behavioral Health Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 3,343,812 | 3,206,607
Goodwill acquired during the period |  | 0 | 183,761
Adjustments to goodwill | [1] | 39,834 | (46,556)
Goodwill, Ending Balance |  | $ 3,383,646 | $ 3,343,812
[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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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