Condensed Consolidating Financial Statements - Schedule of Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 45,811	$ 91,901	$ 213,447	$ 470,872
Accounts receivable — oil and gas revenues	130,934us-gaap_AccountsReceivableNetCurrent	175,653us-gaap_AccountsReceivableNetCurrent
Accounts receivable — joint interest partners	175,537	139,459
Accounts receivable – affiliates	0us-gaap_DueFromAffiliateCurrent
Inventory	21,354us-gaap_InventoryNet	20,652us-gaap_InventoryNet
Prepaid expenses	14,273us-gaap_PrepaidExpenseCurrent	10,191us-gaap_PrepaidExpenseCurrent
Deferred income taxes		6,335
Derivative instruments	302,159us-gaap_DerivativeAssetsCurrent	2,264us-gaap_DerivativeAssetsCurrent
Advances to joint interest partners	13	760
Other current assets	6,526us-gaap_OtherAssetsCurrent	391us-gaap_OtherAssetsCurrent
Total current assets	696,607us-gaap_AssetsCurrent	447,606us-gaap_AssetsCurrent
Property, plant and equipment
Oil and gas properties (successful efforts method)	5,966,140	4,528,958
Other property and equipment	313,439us-gaap_PropertyPlantAndEquipmentOther	188,468us-gaap_PropertyPlantAndEquipmentOther
Less: accumulated depreciation, depletion, amortization and impairment	(1,092,793)	(637,676)
Total property, plant and equipment, net	5,186,786us-gaap_PropertyPlantAndEquipmentNet	4,079,750us-gaap_PropertyPlantAndEquipmentNet
Assets held for sale		137,066
Derivative instruments	13,348us-gaap_DerivativeAssetsNoncurrent	1,333us-gaap_DerivativeAssetsNoncurrent
Deferred costs and other assets	41,671us-gaap_DeferredCostsAndOtherAssets	46,169us-gaap_DeferredCostsAndOtherAssets
Total assets	5,938,412us-gaap_Assets	4,711,924us-gaap_Assets
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	20,958us-gaap_AccountsPayableCurrent	8,920us-gaap_AccountsPayableCurrent
Revenues and production taxes payable	209,890	146,741
Accrued liabilities	410,379us-gaap_AccruedLiabilitiesCurrent	241,830us-gaap_AccruedLiabilitiesCurrent
Accrued interest payable	49,786us-gaap_InterestPayableCurrent	47,910us-gaap_InterestPayableCurrent
Deferred income taxes	97,499us-gaap_DeferredTaxLiabilitiesCurrent	0us-gaap_DeferredTaxLiabilitiesCurrent
Derivative instruments	0us-gaap_DerivativeLiabilitiesCurrent	8,188us-gaap_DerivativeLiabilitiesCurrent
Advances from joint interest partners	6,616	12,829
Total current liabilities	795,128us-gaap_LiabilitiesCurrent	466,418us-gaap_LiabilitiesCurrent
Long-term debt	2,700,000us-gaap_LongTermDebtNoncurrent	2,535,570us-gaap_LongTermDebtNoncurrent
Deferred income taxes	526,770	323,147
Asset retirement obligations	42,097	35,918
Derivative instruments	0us-gaap_DerivativeLiabilitiesNoncurrent	139us-gaap_DerivativeLiabilitiesNoncurrent
Other liabilities	2,116us-gaap_OtherLiabilitiesNoncurrent	2,183us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	4,066,111us-gaap_Liabilities	3,363,375us-gaap_Liabilities
Stockholders’ equity
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,627,296 shares and 100,866,589 shares issued at December 31, 2014 and 2013, respectively	1,001us-gaap_CommonStockValue	996us-gaap_CommonStockValue
Treasury stock, at cost: 285,677 shares and 167,155 shares at December 31, 2014 and 2013, respectively	(10,671)oas_TreasuryStockCost	(5,362)oas_TreasuryStockCost
Additional paid-in-capital	1,007,202	985,023
Retained earnings	874,769	367,892
Total stockholders’ equity	1,872,301us-gaap_StockholdersEquity	1,348,549us-gaap_StockholdersEquity	795,005us-gaap_StockholdersEquity	634,238us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	5,938,412	4,711,924
Parent/Issuer [Member]
Current assets
Cash and cash equivalents	776	34,277	133,797	443,482
Accounts receivable – affiliates	781	770
Prepaid expenses	297	318
Total current assets	1,854	35,365
Property, plant and equipment
Investments in and advances to subsidiaries	4,032,494	3,450,668
Deferred income taxes	149,317	85,288
Deferred costs and other assets	29,435	33,983
Total assets	4,213,100	3,605,304
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable		0
Accounts payable - affiliates	91,459	9,100
Accrued liabilities		33
Accrued interest payable	49,340	47,622
Total current liabilities	140,799	56,755
Long-term debt	2,200,000	2,200,000
Total liabilities	2,340,799	2,256,755
Stockholders’ equity
Common stock, $0.01 par value: 300,000,000 shares authorized; 101,627,296 shares and 100,866,589 shares issued at December 31, 2014 and 2013, respectively	1,001	996
Treasury stock, at cost: 285,677 shares and 167,155 shares at December 31, 2014 and 2013, respectively	(10,671)	(5,362)
Additional paid-in-capital	1,007,202	985,023
Retained earnings	874,769	367,892
Total stockholders’ equity	1,872,301	1,348,549
Total liabilities and stockholders’ equity	4,213,100	3,605,304
Combined Guarantor Subsidiaries [Member]
Current assets
Cash and cash equivalents	45,035	57,624	79,650	27,390
Accounts receivable — oil and gas revenues	130,934	175,653
Accounts receivable — joint interest partners	175,537	139,459
Accounts receivable – affiliates	91,459	9,100
Inventory	21,354	20,652
Prepaid expenses	13,976	9,873
Deferred income taxes		6,335
Derivative instruments	302,159	2,264
Advances to joint interest partners	13	760
Other current assets	6,526	391
Total current assets	786,993	422,111
Property, plant and equipment
Oil and gas properties (successful efforts method)	5,966,140	4,528,958
Other property and equipment	313,439	188,468
Less: accumulated depreciation, depletion, amortization and impairment	(1,092,793)	(637,676)
Total property, plant and equipment, net	5,186,786	4,079,750
Assets held for sale		137,066
Derivative instruments	13,348	1,333
Deferred costs and other assets	12,236	12,186
Total assets	5,999,363	4,652,446
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	20,958	8,920
Accounts payable - affiliates	781	770
Revenues and production taxes payable	209,890	146,741
Accrued liabilities	410,379	241,797
Accrued interest payable	446	288
Deferred income taxes	97,499
Derivative instruments		8,188
Advances from joint interest partners	6,616	12,829
Total current liabilities	746,569	419,533
Long-term debt	500,000	335,570
Deferred income taxes	676,087	408,435
Asset retirement obligations	42,097	35,918
Derivative instruments		139
Other liabilities	2,116	2,183
Total liabilities	1,966,869	1,201,778
Stockholders’ equity
Capital contributions from affiliates	2,899,203	2,930,978
Additional paid-in-capital	8,743	8,743
Retained earnings	1,124,548	510,947
Total stockholders’ equity	4,032,494	3,450,668
Total liabilities and stockholders’ equity	5,999,363	4,652,446
Intercompany Eliminations [Member]
Current assets
Accounts receivable – affiliates	(92,240)	(9,870)
Total current assets	(92,240)	(9,870)
Property, plant and equipment
Investments in and advances to subsidiaries	(4,032,494)	(3,450,668)
Deferred income taxes	(149,317)	(85,288)
Total assets	(4,274,051)	(3,545,826)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable - affiliates	(92,240)	(9,870)
Total current liabilities	(92,240)	(9,870)
Deferred income taxes	(149,317)	(85,288)
Total liabilities	(241,557)	(95,158)
Stockholders’ equity
Capital contributions from affiliates	(2,899,203)	(2,930,978)
Additional paid-in-capital	(8,743)	(8,743)
Retained earnings	(1,124,548)	(510,947)
Total stockholders’ equity	(4,032,494)	(3,450,668)
Total liabilities and stockholders’ equity	$ (4,274,051)	$ (3,545,826)

The total of the amounts received in advance for capital projects from our joint interest partners.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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