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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Mar. 09, 2015 | Sep. 30, 2015 | Sep. 30, 2014
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities |  | $ 280,337 | $ 673,492
Cash flows from investing activities: |  |  |
Capital expenditures |  | (740,633) | (998,889)
Proceeds from sale of properties |  | 78 | 324,938
Derivative settlements |  | 291,436 | (24,773)
Other investing activities |  | (1,161) | (33,163)
Net cash used in investing activities |  | (450,358) | (707,114)
Cash flows from financing activities: |  |  |
Proceeds from sale of common stock | $ 463,100 | 462,833 | 0
Proceeds from revolving credit facility |  | 618,000 | 370,000
Principal payments on revolving credit facility |  | (938,000) | (355,570)
Other financing activities |  | (6,358) | (5,515)
Net cash provided by financing activities |  | 136,475 | 8,915
Decrease in cash and cash equivalents |  | (33,546) | (24,707)
Beginning of period |  | 45,811 | 91,901
End of period |  | 12,265 | 67,194
Parent/Issuer [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities |  | 3,323 | (64,099)
Cash flows from financing activities: |  |  |
Proceeds from sale of common stock |  | 462,833 |
Other financing activities |  | (466,175) | 30,599
Net cash provided by financing activities |  | (3,342) | 30,599
Decrease in cash and cash equivalents |  | (19) | (33,500)
Beginning of period |  | 776 | 34,277
End of period |  | 757 | 777
Combined Guarantor Subsidiaries [Member] |  |  |
Cash flows from operating activities: |  |  |
Net cash provided by (used in) operating activities |  | 277,014 | 737,591
Cash flows from investing activities: |  |  |
Capital expenditures |  | (740,633) | (998,889)
Proceeds from sale of properties |  |  | 324,938
Derivative settlements |  | 291,436 |
Other investing activities |  | (1,161) | (33,163)
Net cash used in investing activities |  | (450,358) | (707,114)
Cash flows from financing activities: |  |  |
Proceeds from revolving credit facility |  | 618,000 | 370,000
Principal payments on revolving credit facility |  | (938,000) | (355,570)
Other financing activities |  | 459,817 | (36,114)
Net cash provided by financing activities |  | 139,817 | (21,684)
Decrease in cash and cash equivalents |  | (33,527) | 8,793
Beginning of period |  | 45,035 | 57,624
End of period |  | $ 11,508 | $ 66,417

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- Definition The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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