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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 19, 2020 | Jun. 23, 2020 | May 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal |  |  |  | $ 500,000,000 |  | $ 500,000,000 |
Loss on early extinguishment of debt |  |  |  | $ 0 | $ 0 | 861,000 | $ 0
Net proceeds of sale of senior notes |  |  |  |  |  | 751,500,000 | $ 0
7.5% Senior Notes due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes retire upon exchange of common stock |  |  | $ 5,600,000 |  |  |  |
Long term debt principal amount retired |  |  | $ 4,200,000 |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  | $ 900,000 |
Interest rate on debt instrument |  |  |  | 7.50% |  | 7.50% |
7.5% Senior Notes due 2025 | Common Stock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Common stock issued upon retirement of senior notes (in shares) |  |  | 767,096 |  |  |  |
Common stock issued upon retirement of senior notes, value |  |  | $ 5,000,000.0 |  |  |  |
9.75% Senior Notes due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount of senior notes issued | $ 300,000,000.0 | $ 500,000,000.0 |  |  |  |  |
Net proceeds of sale of senior notes | $ 296,400,000 | $ 441,100,000 |  |  |  |  |
Interest rate on debt instrument |  | 9.75% |  | 9.75% |  | 9.75% |
Bank Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal |  |  |  | $ 500,000,000.0 |  | $ 500,000,000.0 |
Bank credit facility |  |  |  | $ 1,400,000,000 |  | $ 1,400,000,000 |
Leverage ratio |  |  |  |  |  | 400.00% |
Current ratio |  |  |  |  |  | 100.00% |
Bank Credit Facility | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee on unused borrowing base |  |  |  |  |  | 0.375% |
Bank Credit Facility | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee on unused borrowing base |  |  |  |  |  | 0.50% |
Bank Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread rate for interest rate on credit facility |  |  |  |  |  | 2.25% |
Bank Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread rate for interest rate on credit facility |  |  |  |  |  | 3.25% |
Bank Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread rate for interest rate on credit facility |  |  |  |  |  | 1.25% |
Bank Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Spread rate for interest rate on credit facility |  |  |  |  |  | 2.25% |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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