Guarantor Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ (327,388)us-gaap_NetIncomeLoss	$ 25,943us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	86,422	82,646
Write-down of oil and gas properties	491,412us-gaap_ImpairmentOfOilAndGasProperties
Accretion expense	6,409	7,555
Deferred income tax (benefit) provision	(179,906)us-gaap_DeferredIncomeTaxExpenseBenefit	15,102us-gaap_DeferredIncomeTaxExpenseBenefit
Settlement of asset retirement obligations	(17,145)	(9,842)
Non-cash stock compensation expense	2,640us-gaap_ShareBasedCompensation	2,247us-gaap_ShareBasedCompensation
Non-cash derivative expense	1,511us-gaap_UnrealizedGainLossOnDerivatives	448us-gaap_UnrealizedGainLossOnDerivatives
Non-cash interest expense	4,318us-gaap_OtherNoncashExpense	4,070us-gaap_OtherNoncashExpense
Change in current income taxes	7,188
(Increase) decrease in accounts receivable	8,206	(18,602)
Decrease in other current assets	1,883	100
(Increase) decrease in inventory		(928)us-gaap_IncreaseDecreaseInInventories
Decrease in accounts payable	(8,657)	1,293
Increase in other current liabilities	6,889	5,820
Other	(260)	(380)
Net cash (used in) provided by operating activities	83,522	115,472
Cash flows from investing activities:
Investment in oil and gas properties	(169,895)	(287,175)
Proceeds from sale of oil and gas properties, net of expenses		51,954
Investment in fixed and other assets	(662)	(1,654)
Change in restricted funds	177,642	(358)
Net cash provided by (used in) investing activities	7,085	(237,233)
Cash flows from financing activities:
Proceeds from bank borrowings	5,000
Deferred financing costs		(126)us-gaap_PaymentsOfDebtIssuanceCosts
Repayments of bank borrowings	(5,000)
Net payments for share-based compensation	(2,991)	(6,565)
Net cash used in financing activities	(2,991)	(6,691)
Effect of exchange rate changes on cash	24	(11)
Net change in cash and cash equivalents	87,640	(128,463)
Cash and cash equivalents, beginning of period	74,488	331,224
Cash and cash equivalents, end of period	162,128	202,761
Parent [Member]
Cash flows from operating activities:
Net income (loss)	(327,388)	25,943
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	42,112	28,055
Write-down of oil and gas properties	491,412
Accretion expense	91	68
Deferred income tax (benefit) provision	(196,234)	(5,907)
Settlement of asset retirement obligations	(1)
Non-cash stock compensation expense	2,640	2,247
Non-cash interest expense	4,318	4,070
Change in current income taxes	7,188
Non-cash income from investment in subsidiaries	(29,027)	(37,345)
Change in intercompany receivables/payables	(33,748)	(51,037)
(Increase) decrease in accounts receivable	3,606	(24,762)
Decrease in other current assets	1,881	100
(Increase) decrease in inventory	(2,415)	(928)
Decrease in accounts payable	(1,007)	1,501
Increase in other current liabilities	6,347	5,212
Other	(249)	145
Net cash (used in) provided by operating activities	(30,474)	(52,638)
Cash flows from investing activities:
Investment in oil and gas properties	(84,470)	(46,772)
Proceeds from sale of oil and gas properties, net of expenses		9,700
Investment in fixed and other assets	(662)	(1,654)
Change in restricted funds	177,647
Net cash provided by (used in) investing activities	92,515	(38,726)
Cash flows from financing activities:
Proceeds from bank borrowings	5,000
Deferred financing costs		(126)
Repayments of bank borrowings	(5,000)
Net payments for share-based compensation	(2,991)	(6,565)
Net cash used in financing activities	(2,991)	(6,691)
Net change in cash and cash equivalents	59,050	(98,055)
Cash and cash equivalents, beginning of period	72,886	246,294
Cash and cash equivalents, end of period	131,936	148,239
Guarantor Subsidiary [Member]
Cash flows from operating activities:
Net income (loss)	29,027	37,341
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	44,310	54,591
Accretion expense	6,318	7,487
Deferred income tax (benefit) provision	16,328	21,009
Settlement of asset retirement obligations	(17,144)	(9,842)
Non-cash derivative expense	1,511	448
Change in intercompany receivables/payables	25,548	47,637
(Increase) decrease in accounts receivable	4,600	6,160
(Increase) decrease in inventory	2,415
Decrease in accounts payable	(7,650)	(208)
Increase in other current liabilities	542	608
Other	(11)	(525)
Net cash (used in) provided by operating activities	105,794	164,706
Cash flows from investing activities:
Investment in oil and gas properties	(77,229)	(236,903)
Proceeds from sale of oil and gas properties, net of expenses		42,254
Net cash provided by (used in) investing activities	(77,229)	(194,649)
Cash flows from financing activities:
Net change in cash and cash equivalents	28,565	(29,943)
Cash and cash equivalents, beginning of period	1,450	84,290
Cash and cash equivalents, end of period	30,015	54,347
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)		8
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash income from investment in subsidiaries		(4)
Change in intercompany receivables/payables	8,200	3,400
Decrease in other current assets	2
Net cash (used in) provided by operating activities	8,202	3,404
Cash flows from investing activities:
Investment in oil and gas properties	(8,196)	(3,500)
Change in restricted funds	(5)	(358)
Investment in subsidiaries	(8,168)	(3,955)
Net cash provided by (used in) investing activities	(16,369)	(7,813)
Cash flows from financing activities:
Equity proceeds from parent	8,168	3,955
Net cash used in financing activities	8,168	3,955
Effect of exchange rate changes on cash	24	(11)
Net change in cash and cash equivalents	25	(465)
Cash and cash equivalents, beginning of period	152	640
Cash and cash equivalents, end of period	177	175
Eliminations [Member]
Cash flows from operating activities:
Net income (loss)	(29,027)	(37,349)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash income from investment in subsidiaries	29,027	37,349
Cash flows from investing activities:
Investment in subsidiaries	8,168	3,955
Net cash provided by (used in) investing activities	8,168	3,955
Cash flows from financing activities:
Equity proceeds from parent	(8,168)	(3,955)
Net cash used in financing activities	$ (8,168)	$ (3,955)

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