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Summarized Quarterly Financial Information - Unaudited - Results of Operations by Quarter (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenue $ 184,780us-gaap_Revenues $ 183,213us-gaap_Revenues $ 207,046us-gaap_Revenues $ 223,830us-gaap_Revenues $ 239,253us-gaap_Revenues $ 256,685us-gaap_Revenues $ 245,877us-gaap_Revenues $ 233,732us-gaap_Revenues $ 795,542us-gaap_Revenues $ 974,179us-gaap_Revenues $ 951,489us-gaap_Revenues
Income (loss) from operations (286,147)us-gaap_OperatingIncomeLoss [1] (34,356)us-gaap_OperatingIncomeLoss [2] 16,613us-gaap_OperatingIncomeLoss 48,552us-gaap_OperatingIncomeLoss 37,206us-gaap_OperatingIncomeLoss [3] 62,422us-gaap_OperatingIncomeLoss 69,525us-gaap_OperatingIncomeLoss 72,828us-gaap_OperatingIncomeLoss (255,338)us-gaap_OperatingIncomeLoss 241,981us-gaap_OperatingIncomeLoss 263,965us-gaap_OperatingIncomeLoss
Net income (loss) $ (190,515)us-gaap_NetIncomeLoss [1] $ (29,415)us-gaap_NetIncomeLoss [2] $ 4,444us-gaap_NetIncomeLoss $ 25,943us-gaap_NetIncomeLoss $ 1,752us-gaap_NetIncomeLoss [3],[4] $ 36,102us-gaap_NetIncomeLoss $ 39,022us-gaap_NetIncomeLoss $ 40,758us-gaap_NetIncomeLoss $ (189,543)us-gaap_NetIncomeLoss $ 117,634us-gaap_NetIncomeLoss $ 149,426us-gaap_NetIncomeLoss
Basic earnings (loss) per share $ (3.47)us-gaap_EarningsPerShareBasic $ (0.54)us-gaap_EarningsPerShareBasic $ 0.08us-gaap_EarningsPerShareBasic $ 0.52us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic $ 0.72us-gaap_EarningsPerShareBasic $ 0.78us-gaap_EarningsPerShareBasic $ 0.82us-gaap_EarningsPerShareBasic $ (3.60)us-gaap_EarningsPerShareBasic $ 2.36us-gaap_EarningsPerShareBasic $ 3.03us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share $ (3.47)us-gaap_EarningsPerShareDiluted $ (0.54)us-gaap_EarningsPerShareDiluted $ 0.08us-gaap_EarningsPerShareDiluted $ 0.52us-gaap_EarningsPerShareDiluted $ 0.04us-gaap_EarningsPerShareDiluted $ 0.72us-gaap_EarningsPerShareDiluted $ 0.78us-gaap_EarningsPerShareDiluted $ 0.82us-gaap_EarningsPerShareDiluted $ (3.60)us-gaap_EarningsPerShareDiluted $ 2.36us-gaap_EarningsPerShareDiluted $ 3.03us-gaap_EarningsPerShareDiluted
[1] Includes a write-down of oil and gas properties of $304,062 before income tax effect ($194,600 net of income tax effect).
[2] Includes a write-down of oil and gas properties of $47,130 before income tax effect ($30,163 net of income tax effect).
[3] Includes franchise tax settlement of $12,590 before income tax effect ($8,058 net of income tax effect).
[4] Includes loss on early extinguishment of debt of $27,279 before income tax effect ($17,459 net of income tax effect).