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Accrued Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities Current [Line Items]
Accrued capital costs	$ 167,246	$ 106,405
Accrued lease operating expenses	9,786	7,794
Accrued general and administrative expenses	7,703	3,397
Other accrued liabilities	5,128	2,096
Total accrued liabilities	$ 189,863	$ 119,692

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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