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Fresh-Start Accounting - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Jul. 31, 2017
Fresh Start Accounting [Line Items] |  |
Enterprise value of successor entity |  | $ 1,050,000
Enterprise value for deriving equity value |  | 1,055,000
Minimum |  |
Fresh Start Accounting [Line Items] |  |
Enterprise value of successor entity |  | 850,000
Enterprise value for deriving equity value |  | 743,000
Maximum |  |
Fresh Start Accounting [Line Items] |  |
Enterprise value of successor entity |  | 1,250,000
Enterprise value for deriving equity value |  | $ 1,143,000
Plan of Reorganization |  |
Fresh Start Accounting [Line Items] |  |
Fresh start adjustment, description | Upon our emergence from Chapter 11 bankruptcy, we qualified for and adopted fresh-start accounting in accordance with the provisions set forth in ASC 852 as (i) holders of existing shares of the Predecessor immediately before the Effective Date received less than 50 percent of the voting shares of the Successor entity and (ii) the reorganization value of the Successor was less than its post-petition liabilities and estimated allowed claims immediately before the Effective Date. |
Predecessor shareholders percentage of voting shares of successor entity |  | 50.00%
Percentage of weighted average cost of capital |  | 12.00%

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- Definition The effect of the fresh-start adjustment on asset, liability and equity accounts included in the preconfirmation balance sheet that is the basis to arrive at the postconfirmation balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a)-(b) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 + Details
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- Definition Amount attributed to the reconstituted entity, as well as the expected net realizable value of those assets that will be disposed before reconstitution occurs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 05 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49179835&loc=d3e54813-112758 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56239-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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