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Accrued Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued capital costs	$ 361,034oas_AccruedCapitalCosts	$ 199,085oas_AccruedCapitalCosts
Accrued lease operating expenses	26,706oas_AccruedLeaseOperatingExpense	18,660oas_AccruedLeaseOperatingExpense
Accrued general and administrative expenses	12,225	14,203
Other accrued liabilities	10,414us-gaap_OtherAccruedLiabilitiesCurrent	9,882us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued liabilities	$ 410,379us-gaap_AccruedLiabilitiesCurrent	$ 241,830us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. 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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