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Quarterly Financial Data - Unaudited - Results of Operations (Detail) (USD $) In Thousands, 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]
Revenues	$ 299,672us-gaap_OilAndGasRevenue	$ 368,659us-gaap_OilAndGasRevenue	$ 372,378us-gaap_OilAndGasRevenue	$ 349,519us-gaap_OilAndGasRevenue	$ 333,615us-gaap_OilAndGasRevenue	$ 305,498us-gaap_OilAndGasRevenue	$ 254,582us-gaap_OilAndGasRevenue	$ 248,304us-gaap_OilAndGasRevenue	$ 1,390,228us-gaap_OilAndGasRevenue	$ 1,141,999us-gaap_OilAndGasRevenue	$ 686,668us-gaap_OilAndGasRevenue
Operating income	15,924us-gaap_OperatingIncomeLoss	134,103us-gaap_OperatingIncomeLoss	166,545us-gaap_OperatingIncomeLoss	329,080us-gaap_OperatingIncomeLoss	122,133us-gaap_OperatingIncomeLoss	150,862us-gaap_OperatingIncomeLoss	113,450us-gaap_OperatingIncomeLoss	117,953us-gaap_OperatingIncomeLoss	645,652us-gaap_OperatingIncomeLoss	504,398us-gaap_OperatingIncomeLoss	276,993us-gaap_OperatingIncomeLoss
Net income	$ 176,504us-gaap_NetIncomeLoss	$ 121,587us-gaap_NetIncomeLoss	$ 38,833us-gaap_NetIncomeLoss	$ 169,953us-gaap_NetIncomeLoss	$ 54,490us-gaap_NetIncomeLoss	$ 54,499us-gaap_NetIncomeLoss	$ 67,119us-gaap_NetIncomeLoss	$ 51,851us-gaap_NetIncomeLoss	$ 506,877us-gaap_NetIncomeLoss	$ 227,959us-gaap_NetIncomeLoss	$ 153,388us-gaap_NetIncomeLoss

X

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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X

- Definition

Aggregate revenue during the period related to oil and gas business activities.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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