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Dispositions and Acquisitions - Acquisitions - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 16, 2016 USD ($) shares | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Merger-related expenses |  | $ 813 | $ 33,791 | $ 2,621 | $ 0 |  | $ 37,225 | $ 0 | $ 0
MRD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business merger date |  |  |  |  |  |  | Sep. 16, 2016 |  |
Common stock issued in connection with exchange of outstanding shares | shares | 77,042,749 |  |  |  |  |  |  |  |
Exchange ratio of common shares for acquired company | 0.375 |  |  |  |  |  |  |  |
Fair value of outstanding debt | $ 1,204,449 |  |  |  |  |  |  |  |
Merger-related expenses | $ 37,225 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 146,600 |  |  |
Net operating income |  |  |  |  |  | $ 94,900 |  |  |
Merger related costs incurred by Memorial excluded from ProForma |  |  |  |  |  |  | $ 7,100 |  |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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