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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Taxes [Line Items] |  |  |  |
Federal statutory rate | 35.00% | 35.00% | 35.00% | 35.00%
Income tax (benefit) expense | $ (13,705,000) | $ (134,781,000) | $ (187,231,000) | $ (174,390,000)
Memorial Business Combination Non Deductible Transaction Costs |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax (benefit) expense | 5,300,000 |  |  |
Equity Compensation |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax (benefit) expense |  |  | 3,700,000 |
Deferred compensation plan |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax (benefit) expense | (682,000) | (2,600,000) | 1,800,000 | (3,500,000)
Valuation Allowance, Operating Loss Carryforwards | State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax (benefit) expense | $ 2,800,000 | $ 8,500,000 | $ 10,500,000 | $ 19,800,000

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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