Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts Receivable:
Joint interest billing	$ 5,272	$ 6,287
Trade receivables	2,174	2,014
Oil and gas sales	10,596	9,604
Other	173	122
Accounts Receivable, Gross	18,215	18,027
Less: Allowance for doubtful accounts	(351)	(334)
Total	17,864	17,693
Accounts Payable:
Trade	1,618	1,596
Royalty and other owners	8,943	7,391
Partner advances	3,221	3,378
Prepaid drilling deposits	899	978
Other	2,709	2,906
Total	17,390	16,249
Accrued Liabilities:
Compensation and related expenses	3,779	3,062
Property costs	3,016	3,119
Income tax	200	268
Other	490	383
Total	$ 7,485	$ 6,832

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Accounts payable prepaid drilling deposits current.

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Accounts payable royalty and other owners 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 liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. 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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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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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. 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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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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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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The carrying amount of other receivables, net, due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed.

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The aggregate amount of accounts receivable that will be sold to other entities, at net realizable value.

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