The total of the component of interest expense representing the noncash expenses charged against earnings in the period to amortize the long-term deferred financing costs and other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

No definition available.

Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)		3 Months Ended								12 Months Ended
	Mar. 09, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income		$ 3,968,000	$ 27,055,000	$ (53,230,000)	$ (18,041,000)	$ 176,504,000	$ 121,587,000	$ 38,833,000	$ 169,953,000	$ (40,248,000)	$ 506,877,000	$ 227,959,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in earnings of subsidiaries										0	0	0
Depreciation, depletion and amortization										485,322,000	412,334,000	307,055,000
Gain on sale of properties										0	(186,999,000)	0
Impairment of oil and gas properties										46,109,000	47,238,000	1,168,000
Deferred income taxes										(16,114,000)	307,457,000	134,583,000
Derivative instruments										(210,376,000)	(327,011,000)	35,432,000
Stock-based compensation expenses										25,272,000	21,302,000	11,982,000
Deferred financing costs amortization and other										12,299,000	11,028,000	4,248,000
Working capital and other changes:
Change in accounts receivable										108,461,000	16,702,000	(107,473,000)
Change in inventory										6,873,000	(3,776,000)	(13,941,000)
Change in prepaid expenses										1,828,000	(3,199,000)	(8,191,000)
Change in other current assets										6,489,000	(6,135,000)	(56,000)
Change in other assets										(950,000)	114,000	(3,248,000)
Change in accounts payable and accrued liabilities										(71,617,000)	76,723,000	107,451,000
Change in other current liabilities										6,500,000	0	0
Change in other liabilities										(33,000)	(139,000)	887,000
Net cash provided by operating activities										359,815,000	872,516,000	697,856,000
Cash flows from investing activities:
Capital expenditures										(819,847,000)	(1,354,281,000)	(893,524,000)
Acquisition of oil and gas properties										(28,817,000)	(46,247,000)	(1,560,072,000)
Proceeds from sale of properties										1,075,000	324,852,000
Costs related to sale of properties										0	(2,337,000)	0
Derivative settlements										370,410,000	6,774,000	(8,133,000)
Redemptions of short-term investments										0	0	25,000,000
Advances from joint interest partners										(1,969,000)	(6,213,000)	(8,347,000)
Net cash used in investing activities										(479,148,000)	(1,077,452,000)	(2,445,076,000)
Cash flows from financing activities:
Proceeds from issuance of senior notes										0	0	1,000,000,000
Proceeds from revolving credit facility										630,000,000	620,000,000	600,000,000
Principal payments on revolving credit facility										(992,000,000)	(455,570,000)	(264,430,000)
Deferred financing costs										(14,632,000)	(99,000)	(22,910,000)
Proceeds from sale of common stock	$ 462,800,000									462,833,000	0	314,580,000
Purchases of treasury stock										(2,949,000)	(5,309,000)	(1,566,000)
Investment in / capital contributions from subsidiaries										0	0	0
Other										0	(176,000)	0
Net cash provided by financing activities										83,252,000	158,846,000	1,625,674,000
Decrease in cash and cash equivalents										(36,081,000)	(46,090,000)	(121,546,000)
Beginning of period					45,811,000				91,901,000	45,811,000	91,901,000	213,447,000
End of period		9,730,000				45,811,000				9,730,000	45,811,000	91,901,000
Parent/ Issuer
Cash flows from operating activities:
Net income										(40,248,000)	506,877,000	227,959,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in earnings of subsidiaries										(69,986,000)	(613,601,000)	(299,459,000)
Depreciation, depletion and amortization										0	0	0
Gain on sale of properties											0
Impairment of oil and gas properties										0	0	0
Deferred income taxes										(55,857,000)	(64,029,000)	(42,542,000)
Derivative instruments										0	0	0
Stock-based compensation expenses										24,762,000	20,701,000	11,602,000
Deferred financing costs amortization and other										4,964,000	4,549,000	4,018,000
Working capital and other changes:
Change in accounts receivable										(482,000)	(11,000)	(460,000)
Change in inventory										0	0	0
Change in prepaid expenses										19,000	21,000	(5,000)
Change in other current assets										0	0	235,000
Change in other assets										0	0	0
Change in accounts payable and accrued liabilities										156,039,000	84,044,000	20,710,000
Change in other current liabilities										0
Change in other liabilities										0	0	0
Net cash provided by operating activities										19,211,000	(61,449,000)	(77,942,000)
Cash flows from investing activities:
Capital expenditures										0	0	0
Acquisition of oil and gas properties										0	0	0
Proceeds from sale of properties										0	0
Costs related to sale of properties											0
Derivative settlements										0	0	0
Redemptions of short-term investments												25,000,000
Advances from joint interest partners										0	0	0
Net cash used in investing activities										0	0	25,000,000
Cash flows from financing activities:
Proceeds from issuance of senior notes												1,000,000,000
Proceeds from revolving credit facility										0	0	0
Principal payments on revolving credit facility										0	0	0
Deferred financing costs										(11,045,000)	0	(16,362,000)
Proceeds from sale of common stock										462,833,000		314,580,000
Purchases of treasury stock										(2,949,000)	(5,309,000)	(1,566,000)
Investment in / capital contributions from subsidiaries										(468,049,000)	33,433,000	(1,343,230,000)
Other											(176,000)
Net cash provided by financing activities										(19,210,000)	27,948,000	(46,578,000)
Decrease in cash and cash equivalents										1,000	(33,501,000)	(99,520,000)
Beginning of period					776,000				34,277,000	776,000	34,277,000	133,797,000
End of period		777,000				776,000				777,000	776,000	34,277,000
Combined Guarantor Subsidiaries
Cash flows from operating activities:
Net income										69,986,000	613,601,000	299,459,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in earnings of subsidiaries										0	0	0
Depreciation, depletion and amortization										485,322,000	412,334,000	307,055,000
Gain on sale of properties											(186,999,000)
Impairment of oil and gas properties										46,109,000	47,238,000	1,168,000
Deferred income taxes										39,743,000	371,486,000	177,125,000
Derivative instruments										(210,376,000)	(327,011,000)	35,432,000
Stock-based compensation expenses										510,000	601,000	380,000
Deferred financing costs amortization and other										7,335,000	6,479,000	230,000
Working capital and other changes:
Change in accounts receivable										(47,553,000)	(65,657,000)	(110,266,000)
Change in inventory										6,873,000	(3,776,000)	(13,941,000)
Change in prepaid expenses										1,809,000	(3,220,000)	(8,186,000)
Change in other current assets										6,489,000	(6,135,000)	(291,000)
Change in other assets										(950,000)	114,000	(3,248,000)
Change in accounts payable and accrued liabilities										(71,160,000)	75,049,000	89,994,000
Change in other current liabilities										6,500,000
Change in other liabilities										(33,000)	(139,000)	887,000
Net cash provided by operating activities										340,604,000	933,965,000	775,798,000
Cash flows from investing activities:
Capital expenditures										(819,847,000)	(1,354,281,000)	(893,524,000)
Acquisition of oil and gas properties										(28,817,000)	(46,247,000)	(1,560,072,000)
Proceeds from sale of properties										1,075,000	324,852,000
Costs related to sale of properties											(2,337,000)
Derivative settlements										370,410,000	6,774,000	(8,133,000)
Redemptions of short-term investments												0
Advances from joint interest partners										(1,969,000)	(6,213,000)	(8,347,000)
Net cash used in investing activities										(479,148,000)	(1,077,452,000)	(2,470,076,000)
Cash flows from financing activities:
Proceeds from issuance of senior notes												0
Proceeds from revolving credit facility										630,000,000	620,000,000	600,000,000
Principal payments on revolving credit facility										(992,000,000)	(455,570,000)	(264,430,000)
Deferred financing costs										(3,587,000)	(99,000)	(6,548,000)
Proceeds from sale of common stock										0		0
Purchases of treasury stock										0	0	0
Investment in / capital contributions from subsidiaries										468,049,000	(33,433,000)	1,343,230,000
Other											0
Net cash provided by financing activities										102,462,000	130,898,000	1,672,252,000
Decrease in cash and cash equivalents										(36,082,000)	(12,589,000)	(22,026,000)
Beginning of period					45,035,000				57,624,000	45,035,000	57,624,000	79,650,000
End of period		8,953,000				45,035,000				8,953,000	45,035,000	57,624,000
Intercompany Eliminations
Cash flows from operating activities:
Net income										(69,986,000)	(613,601,000)	(299,459,000)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in earnings of subsidiaries										69,986,000	613,601,000	299,459,000
Depreciation, depletion and amortization										0	0	0
Gain on sale of properties											0
Impairment of oil and gas properties										0	0	0
Deferred income taxes										0	0	0
Derivative instruments										0	0	0
Stock-based compensation expenses										0	0	0
Deferred financing costs amortization and other										0	0	0
Working capital and other changes:
Change in accounts receivable										156,496,000	82,370,000	3,253,000
Change in inventory										0	0	0
Change in prepaid expenses										0	0	0
Change in other current assets										0	0	0
Change in other assets										0	0	0
Change in accounts payable and accrued liabilities										(156,496,000)	(82,370,000)	(3,253,000)
Change in other current liabilities										0
Change in other liabilities										0	0	0
Net cash provided by operating activities										0	0	0
Cash flows from investing activities:
Capital expenditures										0	0	0
Acquisition of oil and gas properties										0	0	0
Proceeds from sale of properties										0	0
Costs related to sale of properties											0
Derivative settlements										0	0	0
Redemptions of short-term investments												0
Advances from joint interest partners										0	0	0
Net cash used in investing activities										0	0	0
Cash flows from financing activities:
Proceeds from issuance of senior notes												0
Proceeds from revolving credit facility										0	0	0
Principal payments on revolving credit facility										0	0	0
Deferred financing costs										0	0	0
Proceeds from sale of common stock										0		0
Purchases of treasury stock										0	0	0
Investment in / capital contributions from subsidiaries										0	0	0
Other											0
Net cash provided by financing activities										0	0	0
Decrease in cash and cash equivalents										0	0	0
Beginning of period					$ 0				$ 0	0	0	0
End of period		$ 0				$ 0				$ 0	$ 0	$ 0