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Accrued Liabilities - Components of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accrued capital costs	$ 199,085	$ 167,246
Accrued lease operating expenses	18,660	9,786
Accrued general and administrative expenses	14,203	7,703
Other accrued liabilities	9,882	5,128
Total accrued liabilities	$ 241,830	$ 189,863

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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