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Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 3,291,213 | $ 3,049,016
Goodwill acquired during the period |  | 318,907 | 250,212
Goodwill divested during the period |  | (1,497) |
Adjustments to goodwill | [1] | (12,509) | (8,015)
Goodwill, Ending Balance |  | 3,596,114 | 3,291,213
Acute Care Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 387,099 | 383,011
Goodwill acquired during the period |  | 2,480 | 4,088
Goodwill divested during the period |  | 0 |
Adjustments to goodwill | [1] | (72) | 0
Goodwill, Ending Balance |  | 389,507 | 387,099
Behavioral Health Services |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 2,904,114 | 2,666,005
Goodwill acquired during the period |  | 316,427 | 246,124
Goodwill divested during the period |  | (1,497) |
Adjustments to goodwill | [1] | (12,437) | (8,015)
Goodwill, Ending Balance |  | $ 3,206,607 | $ 2,904,114
[1] | The 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 -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 + 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 (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments 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 (f) -URI http://asc.fasb.org/extlink&oid=35741047&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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