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Basis of Presentation - Merger - Additional Information (Detail) $ in Thousands | Sep. 16, 2016 USD ($) shares | Sep. 30, 2016 USD ($)
--- | --- | ---
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |
Goodwill |  |  | $ 1,630,981
Memorial |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |
Common stock issued in connection with exchange of outstanding shares | shares |  | 77,042,749 |
Exchange ratio of common shares for acquired company |  | 0.375 |
Goodwill | [1] | $ 1,630,981 |
[1] | Goodwill will not be deductible for income tax purposes.

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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=64834752&loc=SL49117168-202975 + Details
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