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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Accrued Liabilities [Line Items]
Accrued drilling costs	$ 15,140	$ 4,726
Accrued interest	12,244	12,351
Accrued transportation costs payable	3,075	3,553
Accrued taxes payable	3,546
Accrued oil and gas property acquisition costs		2,413
Advance from joint venture partner		7,286
Other accrued liabilities	4,209	6,672
Total accrued liabilities	$ 38,214	$ 37,001

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. 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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- Definition

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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