Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts Receivable:
Joint interest billing	$ 3,777	$ 2,189
Trade receivables	2,574	1,580
Oil and gas sales	11,472	9,362
Other	232	436
Accounts Receivable, Gross	18,055	13,567
Less: Allowance for doubtful accounts	(333)	(355)
Total	17,722	13,212
Accounts Payable:
Trade	1,398	3,968
Royalty and other owners	9,393	9,652
Prepaid drilling deposits	693	306
Other	6,315	5,642
Total	17,799	19,568
Accrued Liabilities:
Compensation and related expenses	5,230	2,517
Property costs	2,060	4,549
Other	841	552
Total	$ 8,131	$ 7,618

Accounts payable prepaid drilling deposits current.

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Accounts receivable oil and gas sales current.

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Accrued liabilities property costs current.

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Carrying value as of the balance sheet date of obligations incurred and payable, which are not elsewhere 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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Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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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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