PrimeEnergy Resources (PNRG) 10-Q 13 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 10, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'PNRG	'
Entity Registrant Name	'PRIMEENERGY CORP	'
Entity Central Index Key	'0000056868	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Smaller Reporting Company	'
Entity Common Stock, Shares Outstanding	'	2,343,660

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$9,193	$9,526
Restricted cash and cash equivalents	3,507	2,065
Accounts receivable, net	16,625	17,693
Other current assets	4,105	3,391
Total Current Assets	33,430	32,675
Property and Equipment, at cost	'	'
Oil and gas properties (successful efforts method), net	204,730	195,023
Field and office equipment, net	12,723	13,402
Total Property and Equipment, Net	217,453	208,425
Other Assets	1,238	1,822
Total Assets	252,121	242,922
Current Liabilities	'	'
Accounts payable	17,894	16,249
Accrued liabilities	15,378	6,832
Current portion of long-term debt	2,832	1,870
Current portion of asset retirement and other long-term obligations	2,740	3,310
Derivative liability short-term	313	2,194
Due to related parties	287	23
Total Current Liabilities	39,444	30,478
Long-Term Bank Debt	96,430	120,023
Asset Retirement Obligations	7,222	7,227
Derivative Liability Long-Term	2	94
Deferred Income Taxes	40,099	31,962
Total Liabilities	183,197	189,784
Commitments and Contingencies	'	'
Equity	'	'
Common stock, $.10 par value; Authorized: 4,000,000 shares, issued: 3,836,397 shares	383	383
Paid-in capital	7,122	6,803
Retained earnings	95,457	78,616
Accumulated other comprehensive loss, net	-119	-123
Treasury stock, at cost; 1,492,412 shares and 1,447,613 shares	-42,804	-40,251
Total Stockholders' Equity - PrimeEnergy	60,039	45,428
Non-controlling interest	8,885	7,710
Total Equity	68,924	53,138
Total Liabilities and Equity	$252,121	$242,922

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
Common stock, par value	$0.10	$0.10
Common stock, shares authorized	4,000,000	4,000,000
Common stock, shares issued	3,836,397	3,836,397
Treasury stock, shares	1,492,412	1,447,613

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	'	'	'	'
Oil and gas sales	$23,372	$25,948	$73,636	$71,442
Realized gain (loss) on derivative instruments, net	151	-1,201	-2,572	-1,127
Field service income	6,472	6,772	19,830	18,348
Administrative overhead fees	2,383	2,319	7,057	6,976
Unrealized gain (loss) on derivative instruments, net	8,360	-3,869	2,361	-1,472
Other income	6	11	146	63
Total Revenues	40,744	29,980	100,458	94,230
Costs and Expenses	'	'	'	'
Lease operating expense	10,979	11,331	33,115	32,310
Field service expense	5,149	5,521	15,720	15,224
Depreciation, depletion, amortization and accretion on discounted liabilities	5,789	5,177	16,748	16,329
Gain on settlement of asset retirement obligations	-1,787	'	-1,787	'
General and administrative expense	4,289	3,864	11,819	12,252
Exploration costs	'	2	'	3
Total Costs and Expenses	24,419	25,895	75,615	76,118
Gain on Sale and Exchange of Assets	1,608	760	5,623	2,519
Income from Operations	17,933	4,845	30,466	20,631
Other Income and Expenses	'	'	'	'
Less: Interest expense	984	1,000	3,103	3,158
Add: Interest income	'	'	'	2
Income Before Provision for Income Taxes	16,949	3,845	27,363	17,475
Provision for Income Taxes	5,617	1,227	8,531	5,935
Net Income	11,332	2,618	18,832	11,540
Less: Net Income Attributable to Non-Controlling Interests	533	386	1,991	956
Net Income Attributable to PrimeEnergy	$10,799	$2,232	$16,841	$10,584
Basic Income Per Common Share	$4.58	$0.92	$7.11	$4.32
Diluted Income Per Common Share	$3.47	$0.71	$5.40	$3.32

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'
Net Income	$18,832	$11,540
Other Comprehensive Income (Loss), net of taxes:	'	'
Changes in fair value of hedge positions, net of taxes of $1 and $(12), respectively	4	-21
Total other comprehensive income (loss)	4	-21
Comprehensive Income	18,836	11,519
Less: Comprehensive Income Attributable to Non-Controlling Interest	1,991	956
Comprehensive Income Attributable to PrimeEnergy	$16,845	$10,563

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'
Changes in fair value of hedge positions, tax	$1	($12)

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Equity (USD $)	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Stockholders' Equity - PrimeEnergy [Member]	Non-Controlling Interest [Member]
In Thousands, except Share data
Balance at Dec. 31, 2013	$53,138	$383	$6,803	$78,616	($123)	($40,251)	$45,428	$7,710
Balance, shares at Dec. 31, 2013	3,836,397	3,836,397	'	'	'	'	'	'
Repurchase 44,799 shares of common stock	-2,553	'	'	'	'	-2,553	-2,553	'
Net Income	18,832	'	'	16,841	'	'	16,841	1,991
Other comprehensive income, net of taxes	4	'	'	'	4	'	4	'
Repurchase of non-controlling interests	-233	'	319	'	'	'	319	-552
Distributions to non-controlling interests	-264	'	'	'	'	'	'	-264
Balance at Sep. 30, 2014	$68,924	$383	$7,122	$95,457	($119)	($42,804)	$60,039	$8,885
Balance, shares at Sep. 30, 2014	3,836,397	3,836,397	'	'	'	'	'	'

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Equity (Parenthetical)	9 Months Ended
	Sep. 30, 2014
Repurchase of common stock, shares	44,799
Treasury Stock [Member]	'
Repurchase of common stock, shares	44,799
Total Stockholders' Equity - PrimeEnergy [Member]	'
Repurchase of common stock, shares	44,799

Condensed_Consolidated_Stateme5

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash Flows from Operating Activities:	'	'
Net Income	$18,832	$11,540
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation, depletion, amortization and accretion on discounted liabilities	16,748	16,329
Gain on sale of properties	-5,623	-2,519
Unrealized (gain) loss on derivative instruments, net	-2,361	1,472
Gain on settlement of asset retirement obligations	-1,787	'
Provision for deferred income taxes	8,153	5,407
Changes in assets and liabilities:	'	'
Decrease (increase) in accounts receivable	1,068	-4,510
Decrease in other assets	216	253
Increase (decrease) in accounts payable	203	-362
Increase in accrued liabilities	8,546	2,988
Increase in due to related parties	294	108
Net Cash Provided by Operating Activities	44,289	30,706
Cash Flows from Investing Activities:	'	'
Capital expenditures, including exploration expense	-25,246	-22,459
Proceeds from sale of property and equipment	6,305	2,997
Net Cash Used in Investing Activities	-18,941	-19,462
Cash Flows from Financing Activities:	'	'
Purchase of stock for treasury	-2,553	-2,977
Purchase of non-controlling interests	-233	-14
Proceeds from long-term bank debt and other long-term obligations	40,088	37,250
Repayment of long-term bank debt and other long-term obligations	-62,719	-42,401
Distribution to non-controlling interests	-264	-182
Net Cash Used in Financing Activities	-25,681	-8,324
Net (Decrease) Increase in Cash and Cash Equivalents	-333	2,920
Cash and Cash Equivalents at the Beginning of the Period	9,526	8,602
Cash and Cash Equivalents at the End of the Period	9,193	11,522
Supplemental Disclosures:	'	'
Income taxes paid (refunded)	320	-63
Interest paid	$3,111	$3,187

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	(1) Basis of Presentation:
	The accompanying condensed consolidated financial statements of PrimeEnergy Corporation (“PEC” or the “Company”) have not been audited by independent public accountants. Pursuant to applicable Securities and Exchange Commission (“SEC”) rules and regulations, the accompanying interim financial statements do not include all disclosures presented in annual financial statements and the reader should refer to the Company’s Form 10-K for the year ended December 31, 2013. In the opinion of management, the accompanying interim condensed consolidated financial statements contain all material adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the Company’s condensed consolidated balance sheets as of September 30, 2014 and December 31, 2013, the condensed consolidated results of operations for the three and nine months ended September 30, 2014 and 2013, and the condensed consolidated results of cash flows and equity for the nine months ended September 30, 2014 and 2013. Certain amounts presented in prior period financial statements have been reclassified for consistency with current period presentation. The results for interim periods are not necessarily indicative of annual results. For purposes of disclosure in the condensed consolidated financial statements, subsequent events have been evaluated through the date the statements were issued.
	Recently Issued Accounting Pronouncements:
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” ASU 2013-11 provided guidance on the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This guidance requires entities to present unrecognized tax benefits as a decrease in a net operating loss, similar tax loss, or tax credit carryforward if certain criteria are met. The guidance will eliminate the diversity in practice in the presentation of unrecognized tax benefits but will not alter the way in which entities assess deferred tax assets for realizability. ASU No. 2013-11 is effective for annual and interim reporting periods beginning after December 15, 2013. The requirements of ASU 2013-11 did not have a material impact on the Company’s condensed consolidated financial position, results of operations or cash flows.

Acquisitions_and_Dispositions

Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions and Dispositions	'
	(2) Acquisitions and Dispositions:
	Historically the Company has repurchased the interests of the partners and trust unit holders in the eighteen oil and gas limited partnerships (the “Partnerships”) and the two asset and business income trusts (the “Trusts”) managed by the Company as general partner and as managing trustee, respectively. The Company purchased such interests in amounts totaling $233,000 and $14,000 for the nine months ended September 30, 2014 and 2013, respectively.

Restricted_Cash_and_Cash_Equiv

Restricted Cash and Cash Equivalents	9 Months Ended
	Sep. 30, 2014
Cash and Cash Equivalents [Abstract]	'
Restricted Cash and Cash Equivalents	'
	(3) Restricted Cash and Cash Equivalents:
	Restricted cash and cash equivalents include $3.51 million and $2.01 million at September 30, 2014 and December 31, 2013, respectively, of cash primarily pertaining to oil and gas revenue payments. There were corresponding accounts payable recorded at September 30, 2014 and December 31, 2013 for these liabilities. Both the restricted cash and the accounts payable are classified as current on the accompanying condensed consolidated balance sheets.

Additional_Balance_Sheet_Infor

Additional Balance Sheet Information	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Additional Balance Sheet Information	'
	(4) Additional Balance Sheet Information:
	Certain balance sheet amounts are comprised of the following:
	(Thousands of dollars)	September 30,			December 31,
		2014			2013
	Accounts Receivable:
	Joint interest billing	$	3,322		$	6,287
	Trade receivables		2,120			2,014
	Oil and gas sales		9,441			9,604
	Other		2,285			122
			17,168			18,027
	Less: Allowance for doubtful accounts		(543	)		(334	)
	Total	$	16,625		$	17,693
	Accounts Payable:
	Trade	$	3,534		$	1,596
	Royalty and other owners		9,106			7,391
	Partner advances		3,160			3,378
	Prepaid drilling deposits		340			978
	Other		1,754			2,906
	Total	$	17,894		$	16,249
	Accrued Liabilities:
	Compensation and related expenses	$	6,909		$	3,062
	Property costs		7,725			3,119
	Income tax		322			268
	Other		422			383
	Total	$	15,378		$	6,832

Property_and_Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	(5) Property and Equipment:
	Property and equipment at September 30, 2014 and December 31, 2013 consisted of the following:
	(Thousands of dollars)	September 30,			December 31,
		2014			2013
	Proved oil and gas properties, at cost	$	388,128		$	364,123
	Less: Accumulated depletion and depreciation		(183,398	)		(169,100	)
	Oil and Gas Properties, Net	$	204,730		$	195,023
	Field and office equipment	$	26,867		$	26,653
	Less: Accumulated depreciation		(14,144	)		(13,251	)
	Field and Office Equipment, Net	$	12,723		$	13,402
	Total Property and Equipment, Net	$	217,453		$	208,425

LongTerm_Bank_Debt

Long-Term Bank Debt	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Long-Term Bank Debt	'
	(6) Long-Term Bank Debt:
	Bank Debt:
	Effective July 30, 2010, the Company entered into a Second Amended and Restated Credit Agreement between Compass Bank as agent and a syndicated group of lenders (“Credit Agreement”). The Credit Agreement has a revolving line of credit and letter of credit facility of up to $250 million with a final maturity date of July 30, 2017. The credit facility is secured by substantially all of the Company’s oil and gas properties. The credit facility is subject to a borrowing base determined by the lenders taking into consideration the estimated value of PEC’s oil and gas properties in accordance with the lenders’ customary practices for oil and gas loans. This process involves reviewing PEC’s estimated proved reserves and their valuation. The borrowing base is redetermined semi-annually, and the available borrowing amount could be increased or decreased as a result of such redetermination. In addition, PEC and the lenders each have at their discretion the right to request the borrowing base be redetermined with a maximum of one such request each year. A revision to PEC’s reserves may prompt such a request on the part of the lenders, which could possibly result in a reduction in the borrowing base and availability under the credit facility. At any time if the sum of the outstanding borrowings and letter of credit exposures exceed the applicable portion of the borrowing base, PEC would be required to repay the excess amount within a prescribed period.
	At September 30, 2014, the credit facility borrowing base was $160.0 million with no required monthly reduction amount. The borrowings made within the credit facility may be placed in a base rate loan or LIBO rate loan. The Company’s borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at September 30, 2014) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.00% at September 30, 2014). At September 30, 2014, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 4.75% and 2.65%, respectively.
	At September 30, 2014, the Company had a total of $86.5 million of borrowings outstanding under its revolving credit facility at a weighted-average interest rate of 3.32% and $73.5 million available for future borrowings. The combined weighted average interest rate paid on outstanding bank borrowings subject to base rate and LIBO interest was 3.48% for the nine months ended September 30, 2014 as compared to 3.53% for the nine months ended September 30, 2013.
	On July 31, 2013, the Company entered into a $10.0 million Loan and Security Agreement with JP Morgan Chase Bank (“Equipment Loan”). The Equipment Loan is secured by a portion of the Company’s field service equipment, carries an interest rate of 3.95% per annum, requires monthly payments (principal and interest) of $184,000, and has a final maturity date of July 31, 2018. As of September 30, 2014, the Company had a total of $8.0 million outstanding on the Equipment Loan.
	On July 29, 2014, the Company entered into additional equipment financing facilities totaling $6.0 million with JP Morgan Chase Bank. In August 2014, the Company drew down $4.8 million of this facility that is secured by recently purchased field service equipment, carries an interest rate of 3.40% per annum, requires monthly payments (principal and interest) of $87,800, and has a final maturity date of July 31, 2019. As of September 30, 2014, the Company had a total of $4.8 million outstanding on this facility. The remaining $1.2 million under this facility is available to finance the acquisition of any future field service equipment.
	The Company entered into interest rate hedge agreements to help manage interest rate exposure. These contracts include interest rate swaps. Interest rate swap transactions generally involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. In July 2012, the Company entered into interest swap agreements for a period of two years, which commenced in January 2014, related to $75 million of the Company’s bank debt resulting in a LIBO fixed rate of 0.563%. For the nine months ended September 30, 2014, the Company recorded interest expense and paid $210,000 related to the settlement of interest rate swaps.

Other_LongTerm_Obligations_and

Other Long-Term Obligations and Commitments	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Other Long-Term Obligations and Commitments	'
	(7) Other Long-Term Obligations and Commitments:
	Operating Leases:
	The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. The future minimum lease payments for the rest of fiscal 2014 and thereafter for the operating leases are as follows:
	(Thousands of dollars)	Operating
		Leases
	2014	$	188
	2015		651
	2016		545
	2017		46
	Total minimum payments	$	1,430
	Rent expense for office space for the nine months ended September 30, 2014 and 2013 was $579,000 and $548,000, respectively.
	Asset Retirement Obligation:
	A reconciliation of the liability for plugging and abandonment costs for the nine months ended September 30, 2014 is as follows:
	(Thousands of dollars)
	Asset retirement obligation – December 31, 2013	$	10,537
	Liabilities incurred		1,579
	Liabilities settled		(642	)
	Gain on settlement of liabilities		(1,787	)
	Accretion expense		275
	Revisions in estimated liabilities		—
	Asset retirement obligation – September 30, 2014	$	9,962
	The Company’s liability is determined using significant assumptions, including current estimates of plugging and abandonment costs, annual inflation of these costs, the productive life of wells and a risk-adjusted interest rate. Changes in any of these assumptions can result in significant revisions to the estimated asset retirement obligation. Revisions to the asset retirement obligation are recorded with an offsetting change to producing properties, resulting in prospective changes to depreciation, depletion and amortization expense and accretion of discount. Because of the subjectivity of assumptions and the relatively long life of most of the Company’s wells, the costs to ultimately retire the wells may vary significantly from previous estimates. In 2014, the Company recognized a gain on the settlement of asset retirement obligations associated with insurance recoveries related to obligations previously recognized on the plugging and abandonment of a well.

Contingent_Liabilities

Contingent Liabilities	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contingent Liabilities	'
	(8) Contingent Liabilities:
	The Company, as managing general partner of the affiliated Partnerships, is responsible for all Partnership activities, including the drilling of development wells and the production and sale of oil and gas from productive wells. The Company also provides the administration, accounting and tax preparation work for the Partnerships, and is liable for all debts and liabilities of the affiliated Partnerships, to the extent that the assets of a given limited Partnership are not sufficient to satisfy its obligations. As of September 30, 2014, the affiliated Partnerships have established cash reserves in excess of their debts and liabilities and the Company believes these reserves will be sufficient to satisfy Partnership obligations.
	The Company is subject to environmental laws and regulations. Management believes that future expenses, before recoveries from third parties, if any, will not have a material effect on the Company’s financial condition. This opinion is based on expenses incurred to date for remediation and compliance with laws and regulations, which have not been material to the Company’s results of operations.
	From time to time, the Company is party to certain legal actions arising in the ordinary course of business. While the outcome of these events cannot be predicted with certainty, management does not expect these matters to have a materially adverse effect on the financial position or results of operations of the Company.

Stock_Options_and_Other_Compen

Stock Options and Other Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Options and Other Compensation	'
	(9) Stock Options and Other Compensation:
	In May 1989, non-statutory stock options were granted by the Company to four key executive officers for the purchase of shares of common stock. At September 30, 2014 and 2013, remaining options held by two key executive officers on 767,500 shares were outstanding and exercisable at prices ranging from $1.00 to $1.25. According to their terms, the options have no expiration date.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	(10) Related Party Transactions:
	The Company, as managing general partner or managing trustee, makes an annual offer to repurchase the interests of the partners and trust unit holders in certain of the Partnerships or Trusts. The Company purchased such interests in amounts totaling $233,000 and $14,000 for the nine months ended September 30, 2014 and 2013, respectively.
	Treasury stock purchases in any reported period may include shares from a related party, which may include members of the Company’s Board of Directors.
	Receivables from related parties consist of reimbursable general and administrative costs, lease operating expenses and reimbursement for property development and related costs. These receivables are due from joint venture partners, which may include members of the Company’s Board of Directors.
	Payables owed to related parties primarily represent receipts collected by the Company as agent for the joint venture partners, which may include members of the Company’s Board of Directors, for oil and gas sales net of expenses.

Financial_Instruments

Financial Instruments	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Financial Instruments	'
	(11) Financial Instruments:
	Fair Value Measurements:
	Authoritative guidance on fair value measurements defines fair value, establishes a framework for measuring fair value and stipulates the related disclosure requirements. The Company follows a three-level hierarchy, prioritizing and defining the types of inputs used to measure fair value. The fair values of the Company’s interest rate swaps, natural gas and crude oil price collars and swaps are designated as Level 3. The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013:
	September 30, 2014		Quoted Prices in				Significant				Significant			Balance as of
	(Thousands of dollars)		Active Markets				Other				Unobservable			September 30,
			For Identical				Observable				Inputs (Level 3)			2014
			Assets (Level 1)				Inputs (Level 2)
	Assets
	Commodity derivative contracts		$	—			$	—			$	1,774		$	1,774
	Interest rate derivative contracts			—				—				42			42
	Total assets		$	—			$	—			$	1,816		$	1,816
	Liabilities
	Commodity derivative contracts		$	—			$	—			$	(86	)	$	(86	)
	Interest rate derivative contracts			—				—				(229	)		(229	)
	Total liabilities		$	—			$	—			$	(315	)	$	(315	)
	December 31, 2013		Quoted Prices in				Significant				Significant			Balance as of
	(Thousands of dollars)		Active Markets				Other				Unobservable			December 31,
			For Identical				Observable				Inputs (Level 3)			2013
			Assets (Level 1)				Inputs (Level 2)
	Assets
	Commodity derivative contracts		$	—			$	—			$	1,337		$	1,337
	Interest rate derivative contracts			—				—				86			86
	Total assets		$	—			$	—			$	1,423		$	1,423
	Liabilities
	Commodity derivative contracts		$	—			$	—			$	(2,010	)	$	(2,010	)
	Interest rate derivative contracts			—				—				(278	)		(278	)
	Total liabilities		$	—			$	—			$	(2,288	)	$	(2,288	)
	The derivative contracts were measured based on quotes from the Company’s counterparties. Such quotes have been derived using valuation models that consider various inputs including current market and contractual prices for the underlying instruments, quoted forward prices for natural gas and crude oil, volatility factors and interest rates, such as a LIBOR curve for a similar length of time as the derivative contract term as applicable. These estimates are verified using comparable NYMEX futures contracts or are compared to multiple quotes obtained from counterparties for reasonableness.
	The significant unobservable inputs for Level 3 derivative contracts include basis differentials and volatility factors. An increase (decrease) in these unobservable inputs would result in an increase (decrease) in fair value, respectively. The Company does not have access to the specific assumptions used in its counterparties’ valuation models. Consequently, additional disclosures regarding significant Level 3 unobservable inputs were not provided.
	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the nine months ended September 30, 2014.
	(Thousands of dollars)
	Net liabilities – December 31, 2013		$	(865	)
	Total realized and unrealized gains / losses:
	Included in earnings (a)			(421	)
	Included in other comprehensive income			5
	Purchases, sales, issuances and settlements			2,782
	Net assets – September 30, 2014		$	1,501
	(a)	Derivative instruments are reported in revenues as realized gain/loss and on a separately reported line item captioned unrealized gain/loss on derivative instruments, and interest rate swap instruments are reported as an increase or reduction to interest expense.
	Derivative Instruments:
	The Company is exposed to commodity price and interest rate risk, and management considers periodically the Company’s exposure to cash flow variability resulting from the commodity price changes and interest rate fluctuations. Futures, swaps and options are used to manage the Company’s exposure to commodity price risk inherent in the Company’s oil and gas production operations. The Company does not apply hedge accounting to any of its commodity based derivatives. Both realized and unrealized gains and losses associated with derivative instruments are recognized in earnings.
	Interest rate swap derivatives are treated as cash-flow hedges and are used to fix or float interest rates on existing debt. The value of these interest rate swaps at September 30, 2014 and December 31, 2013 is located in accumulated other comprehensive loss, net of tax. Settlement of the swaps, which began in January 2014, is recorded within interest expense.
	The following table sets forth the effect of derivative instruments on the condensed consolidated balance sheets at September 30, 2014 and December 31, 2013:
					Fair Value
	(Thousands of dollars)		Balance Sheet Location		September 30,				December 31,
					2014				2013
	Asset Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Other assets		$	42			$	86
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Other current assets			1,041				307
	Natural gas commodity contracts		Other current assets			308				50
	Crude oil commodity contracts		Other assets			362				980
	Natural gas commodity contracts		Other assets			63				—
	Total				$	1,816			$	1,423
	Liability Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative liability short-term		$	(229	)		$	(209	)
	Interest rate swap contracts		Derivative liability long-term			—				(69	)
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Derivative liability short-term			(12	)			(1,667	)
	Natural gas commodity contracts		Derivative liability short-term			(72	)			(318	)
	Crude oil commodity contracts		Derivative liability long-term			—				(25	)
	Natural gas commodity contracts		Derivative liability long-term			(2	)			—
Total				$	(315	)		$	(2,288	)
Total derivative instruments				$	1,501			$	(865	)
The following table sets forth the effect of derivative instruments on the condensed consolidated statement of operations for the nine-month periods ended September 30, 2014 and 2013:
(Thousands of dollars)		Location of gain/loss recognized		Amount of gain/loss
		in income		recognized in income
				2014				2013
Derivative designated as cash-flow hedge instruments:
Interest rate swap contracts		Interest expense		$	(210	)		$	—
Derivatives not designated as cash-flow hedge instruments
Natural gas commodity contracts		Unrealized loss on derivative instruments, net			565				(437	)
Crude oil commodity contracts		Unrealized gain (loss) on derivative instruments, net			1,796				2,834
Natural gas commodity contracts (a)		Realized gain (loss) on derivative instruments, net			(580	)			331
Crude oil commodity contracts		Realized loss on derivative instruments, net			(1,992	)			(257	)
				$	(421	)		$	2,471
(a)	In January 2014, the Company unwound and monetized natural gas swaps with original settlement dates from January 2015 through December 2015 for net proceeds of $276,000. In September 2014, the Company unwound and monetized crude oil swaps with original settlement dates from January 2016 through December 2016 for net proceeds of $703,000. The $979,000 gains associated with these early settlement transactions are included in realized gain on derivative instruments for the nine months ended September 30, 2014.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	(12) Earnings Per Share:
	Basic earnings per share are computed by dividing earnings available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect per share amounts that would have resulted if dilutive potential common stock had been converted to common stock in gain periods. The following reconciles amounts reported in the financial statements:
		Nine Months Ended September 30,
		2014						2013
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	16,841		2,367,602	$	7.11	$	10,584		2,448,743	$	4.32
	Effect of dilutive securities:
	Options		—		753,464				—		743,966
	Diluted	$	16,841		3,121,066	$	5.4	$	10,584		3,192,709	$	3.32
		Three Months Ended September 30,
		2014						2013
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	10,799		2,356,766	$	4.58	$	2,232		2,415,303	$	0.92
	Effect of dilutive securities:
	Options		—		754,847				—		749,664
	Diluted	$	10,799		3,111,613	$	3.47	$	2,232		3,164,967	$	0.71

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Recently Issued Accounting Pronouncements	'
	Recently Issued Accounting Pronouncements:
	In July 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” ASU 2013-11 provided guidance on the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This guidance requires entities to present unrecognized tax benefits as a decrease in a net operating loss, similar tax loss, or tax credit carryforward if certain criteria are met. The guidance will eliminate the diversity in practice in the presentation of unrecognized tax benefits but will not alter the way in which entities assess deferred tax assets for realizability. ASU No. 2013-11 is effective for annual and interim reporting periods beginning after December 15, 2013. The requirements of ASU 2013-11 did not have a material impact on the Company’s condensed consolidated financial position, results of operations or cash flows.

Additional_Balance_Sheet_Infor1

Additional Balance Sheet Information (Tables)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Components of Balance Sheet Amounts	'
	Certain balance sheet amounts are comprised of the following:
	(Thousands of dollars)	September 30,			December 31,
		2014			2013
	Accounts Receivable:
	Joint interest billing	$	3,322		$	6,287
	Trade receivables		2,120			2,014
	Oil and gas sales		9,441			9,604
	Other		2,285			122
			17,168			18,027
	Less: Allowance for doubtful accounts		(543	)		(334	)
	Total	$	16,625		$	17,693
	Accounts Payable:
	Trade	$	3,534		$	1,596
	Royalty and other owners		9,106			7,391
	Partner advances		3,160			3,378
	Prepaid drilling deposits		340			978
	Other		1,754			2,906
	Total	$	17,894		$	16,249
	Accrued Liabilities:
	Compensation and related expenses	$	6,909		$	3,062
	Property costs		7,725			3,119
	Income tax		322			268
	Other		422			383
	Total	$	15,378		$	6,832

Property_and_Equipment_Tables

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Components of Property and Equipment	'
	Property and equipment at September 30, 2014 and December 31, 2013 consisted of the following:
	(Thousands of dollars)	September 30,			December 31,
		2014			2013
	Proved oil and gas properties, at cost	$	388,128		$	364,123
	Less: Accumulated depletion and depreciation		(183,398	)		(169,100	)
	Oil and Gas Properties, Net	$	204,730		$	195,023
	Field and office equipment	$	26,867		$	26,653
	Less: Accumulated depreciation		(14,144	)		(13,251	)
	Field and Office Equipment, Net	$	12,723		$	13,402
	Total Property and Equipment, Net	$	217,453		$	208,425

Other_LongTerm_Obligations_and1

Other Long-Term Obligations and Commitments (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases	'
	The Company has several non-cancelable operating leases, primarily for rental of office space, that have a term of more than one year. The future minimum lease payments for the rest of fiscal 2014 and thereafter for the operating leases are as follows:
	(Thousands of dollars)	Operating
		Leases
	2014	$	188
	2015		651
	2016		545
	2017		46
	Total minimum payments	$	1,430
Reconciliation of Liability for Plugging and Abandonment Costs	'
	A reconciliation of the liability for plugging and abandonment costs for the nine months ended September 30, 2014 is as follows:
	(Thousands of dollars)
	Asset retirement obligation – December 31, 2013	$	10,537
	Liabilities incurred		1,579
	Liabilities settled		(642	)
	Gain on settlement of liabilities		(1,787	)
	Accretion expense		275
	Revisions in estimated liabilities		—
	Asset retirement obligation – September 30, 2014	$	9,962

Financial_Instruments_Tables

Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following fair value hierarchy table presents information about the Company’s assets and liabilities measured at fair value on a recurring basis as of September 30, 2014 and December 31, 2013:
	September 30, 2014		Quoted Prices in				Significant				Significant			Balance as of
	(Thousands of dollars)		Active Markets				Other				Unobservable			September 30,
			For Identical				Observable				Inputs (Level 3)			2014
			Assets (Level 1)				Inputs (Level 2)
	Assets
	Commodity derivative contracts		$	—			$	—			$	1,774		$	1,774
	Interest rate derivative contracts			—				—				42			42
	Total assets		$	—			$	—			$	1,816		$	1,816
	Liabilities
	Commodity derivative contracts		$	—			$	—			$	(86	)	$	(86	)
	Interest rate derivative contracts			—				—				(229	)		(229	)
	Total liabilities		$	—			$	—			$	(315	)	$	(315	)
	December 31, 2013		Quoted Prices in				Significant				Significant			Balance as of
	(Thousands of dollars)		Active Markets				Other				Unobservable			December 31,
			For Identical				Observable				Inputs (Level 3)			2013
			Assets (Level 1)				Inputs (Level 2)
	Assets
	Commodity derivative contracts		$	—			$	—			$	1,337		$	1,337
	Interest rate derivative contracts			—				—				86			86
	Total assets		$	—			$	—			$	1,423		$	1,423
	Liabilities
	Commodity derivative contracts		$	—			$	—			$	(2,010	)	$	(2,010	)
	Interest rate derivative contracts			—				—				(278	)		(278	)
	Total liabilities		$	—			$	—			$	(2,288	)	$	(2,288	)
Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3	'
	The following table sets forth a reconciliation of changes in the fair value of financial assets and liabilities classified as Level 3 in the fair value hierarchy for the nine months ended September 30, 2014.
	(Thousands of dollars)
	Net liabilities – December 31, 2013		$	(865	)
	Total realized and unrealized gains / losses:
	Included in earnings (a)			(421	)
	Included in other comprehensive income			5
	Purchases, sales, issuances and settlements			2,782
	Net assets – September 30, 2014		$	1,501
	(a)	Derivative instruments are reported in revenues as realized gain/loss and on a separately reported line item captioned unrealized gain/loss on derivative instruments, and interest rate swap instruments are reported as an increase or reduction to interest expense.
Effect of Derivative Instruments on Condensed Consolidated Balance Sheets	'
	The following table sets forth the effect of derivative instruments on the condensed consolidated balance sheets at September 30, 2014 and December 31, 2013:
					Fair Value
	(Thousands of dollars)		Balance Sheet Location		September 30,				December 31,
					2014				2013
	Asset Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Other assets		$	42			$	86
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Other current assets			1,041				307
	Natural gas commodity contracts		Other current assets			308				50
	Crude oil commodity contracts		Other assets			362				980
	Natural gas commodity contracts		Other assets			63				—
	Total				$	1,816			$	1,423
	Liability Derivatives:
	Derivatives designated as cash-flow hedging instruments:
	Interest rate swap contracts		Derivative liability short-term		$	(229	)		$	(209	)
	Interest rate swap contracts		Derivative liability long-term			—				(69	)
	Derivatives not designated as cash-flow hedging instruments:
	Crude oil commodity contracts		Derivative liability short-term			(12	)			(1,667	)
	Natural gas commodity contracts		Derivative liability short-term			(72	)			(318	)
	Crude oil commodity contracts		Derivative liability long-term			—				(25	)
	Natural gas commodity contracts		Derivative liability long-term			(2	)			—
	Total				$	(315	)		$	(2,288	)
	Total derivative instruments				$	1,501			$	(865	)
Effect of Derivative Instruments on Condensed Consolidated Statement of Operations	'
	The following table sets forth the effect of derivative instruments on the condensed consolidated statement of operations for the nine-month periods ended September 30, 2014 and 2013:
	(Thousands of dollars)		Location of gain/loss recognized		Amount of gain/loss
			in income		recognized in income
					2014				2013
	Derivative designated as cash-flow hedge instruments:
	Interest rate swap contracts		Interest expense		$	(210	)		$	—
	Derivatives not designated as cash-flow hedge instruments
	Natural gas commodity contracts		Unrealized loss on derivative instruments, net			565				(437	)
	Crude oil commodity contracts		Unrealized gain (loss) on derivative instruments, net			1,796				2,834
	Natural gas commodity contracts (a)		Realized gain (loss) on derivative instruments, net			(580	)			331
	Crude oil commodity contracts		Realized loss on derivative instruments, net			(1,992	)			(257	)
					$	(421	)		$	2,471
	(a)	In January 2014, the Company unwound and monetized natural gas swaps with original settlement dates from January 2015 through December 2015 for net proceeds of $276,000. In September 2014, the Company unwound and monetized crude oil swaps with original settlement dates from January 2016 through December 2016 for net proceeds of $703,000. The $979,000 gains associated with these early settlement transactions are included in realized gain on derivative instruments for the nine months ended September 30, 2014.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings (Loss) Per Share	'
	The following reconciles amounts reported in the financial statements:
		Nine Months Ended September 30,
		2014						2013
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	16,841		2,367,602	$	7.11	$	10,584		2,448,743	$	4.32
	Effect of dilutive securities:
	Options		—		753,464				—		743,966
	Diluted	$	16,841		3,121,066	$	5.4	$	10,584		3,192,709	$	3.32
		Three Months Ended September 30,
		2014						2013
		Net Income		Weighted		Per Share		Net Income		Weighted		Per Share
		(In 000’s)		Average		Amount		(In 000’s)		Average		Amount
				Number of						Number of
				Shares						Shares
				Outstanding						Outstanding
	Basic	$	10,799		2,356,766	$	4.58	$	2,232		2,415,303	$	0.92
	Effect of dilutive securities:
	Options		—		754,847				—		749,664
	Diluted	$	10,799		3,111,613	$	3.47	$	2,232		3,164,967	$	0.71

Acquisitions_and_Dispositions_

Acquisitions and Dispositions - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
	Trust
	Investment
Business Combinations [Abstract]	'	'
Number of limited partnerships	18	'
Number of business income trusts	2	'
Purchase of non-controlling interests	$233	$14

Restricted_Cash_and_Cash_Equiv1

Restricted Cash and Cash Equivalents - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Cash and Cash Equivalents [Abstract]	'	'
Restricted cash and cash equivalents pertaining to oil and gas revenue payments	$3.51	$2.01

Additional_Balance_Sheet_Infor2

Additional Balance Sheet Information - Components of Balance Sheet Amounts (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts Receivable:	'	'
Joint interest billing	$3,322	$6,287
Trade receivables	2,120	2,014
Oil and gas sales	9,441	9,604
Other	2,285	122
Accounts Receivable, Gross	17,168	18,027
Less: Allowance for doubtful accounts	-543	-334
Total	16,625	17,693
Accounts Payable:	'	'
Trade	3,534	1,596
Royalty and other owners	9,106	7,391
Partner advances	3,160	3,378
Prepaid drilling deposits	340	978
Other	1,754	2,906
Total	17,894	16,249
Accrued Liabilities:	'	'
Compensation and related expenses	6,909	3,062
Property costs	7,725	3,119
Income tax	322	268
Other	422	383
Total	$15,378	$6,832

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]	'	'
Proved oil and gas properties, at cost	$388,128	$364,123
Less: Accumulated depletion and depreciation	-183,398	-169,100
Oil and Gas Properties, Net	204,730	195,023
Field and office equipment	26,867	26,653
Less: Accumulated depreciation	-14,144	-13,251
Field and Office Equipment, Net	12,723	13,402
Total Property and Equipment, Net	$217,453	$208,425

LongTerm_Bank_Debt_Additional_

Long-Term Bank Debt - Additional Information (Detail) (USD $)	9 Months Ended				1 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Jul. 31, 2013	Aug. 31, 2014	Sep. 30, 2014	Jul. 29, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
			Equipment Loan [Member]	Equipment Loan [Member]	Additional Equipment Loan [Member]	Additional Equipment Loan [Member]	Additional Equipment Loan [Member]	Minimum [Member]	Maximum [Member]	Interest Rate Swap [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'
Credit facility borrowing capacity	$250,000,000	'	'	'	'	'	'	'	'	'
Maturity date of amended and restated credit agreement	30-Jul-17	'	'	'	'	'	'	'	'	'
Credit facility borrowing base	160,000,000	'	'	'	'	'	'	'	'	'
Credit facility, interest rate description	'The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.25% at September 30, 2014) plus applicable margin utilization rates that range from 1.50% to 2.00%, and LIBO rate loans at LIBO published rates plus applicable utilization rates (2.50% to 3.00% at September 30, 2014). At September 30, 2014, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 4.75% and 2.65%, respectively.	'	'	'	'	'	'	'	'	'
Percentage for base rate loans at the prime rate	3.25%	'	3.95%	'	'	3.40%	'	'	'	0.56%
Minimum range for applicable margin utilization rate	1.50%	'	'	'	'	'	'	'	'	'
Maximum range for applicable margin utilization rate	2.00%	'	'	'	'	'	'	'	'	'
Debt instrument interest one base rate basis for effective rate	4.75%	'	'	'	'	'	'	'	'	'
LIBOR rate loans	'	'	'	'	'	'	'	2.50%	3.00%	'
Effective LIBOR loan rate	2.65%	'	'	'	'	'	'	'	'	'
Outstanding borrowings under revolving credit facility	86,500,000	'	'	'	'	'	'	'	'	'
Weighted-average interest rate of borrowings	3.32%	'	'	'	'	'	'	'	'	'
Credit facility remaining borrowing capacity	73,500,000	'	'	'	'	1,200,000	'	'	'	'
Debt instrument basis weighted average interest rate spread on variable rate	3.48%	3.53%	'	'	'	'	'	'	'	'
Equipment Loan, face amount	'	'	'	10,000,000	'	'	6,000,000	'	'	'
Equipment Loan, monthly payment	'	'	184,000	'	'	87,800	'	'	'	'
Equipment Loan, maturity date	'	'	31-Jul-18	'	'	31-Jul-19	'	'	'	'
Company's bank debt	'	'	8,000,000	'	'	4,800,000	'	'	'	75,000,000
Additional equipment Loan, drawings	'	'	'	'	4,800,000	'	'	'	'	'
Interest swap agreements period	'	'	'	'	'	'	'	'	'	'2 years
Commenced date	'	'	'	'	'	'	'	'	'	31-Jan-14
Settlement of interest rate swaps	'	'	'	'	'	'	'	'	'	$210,000

Other_LongTerm_Obligations_and2

Other Long-Term Obligations and Commitments - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
Lease period description	'Term of more than one year	'
Rent expense for office space	$579	$548

Other_LongTerm_Obligations_and3

Other Long-Term Obligations and Commitments - Summary of Future Minimum Lease Payments for Non-Cancelable Operating Leases (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'
2014	$188
2015	651
2016	545
2017	46
Total minimum payments	$1,430

Other_LongTerm_Obligations_and4

Other Long-Term Obligations and Commitments - Reconciliation of Liability for Plugging and Abandonment Costs (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'	'
Asset retirement obligation - December 31, 2013	'	$10,537
Liabilities incurred	'	1,579
Liabilities settled	'	-642
Gain on settlement of liabilities	-1,787	-1,787
Accretion expense	'	275
Revisions in estimated liabilities	'	'
Asset retirement obligation - September 30, 2014	$9,962	$9,962

Stock_Options_and_Other_Compen1

Stock Options and Other Compensation - Additional Information (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013	31-May-89
	Officers	Officers	Officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Options outstanding, shares	767,500	767,500	'
Options exercisable, shares	767,500	767,500	'
Number of key executive officers to whom non-statutory stock options granted	2	2	4
Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Average exercise price	1	1	'
Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Average exercise price	1.25	1.25	'

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Related Party Transactions [Abstract]	'	'
Repurchase interests of partners and trust unit holders	$233	$14

Financial_Instruments_Schedule

Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Derivative assets	$1,816	$1,423
Liabilities	'	'
Derivative liabilities	-315	-2,288
Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	1,816	1,423
Liabilities	'	'
Derivative liabilities	-315	-2,288
Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	1,774	1,337
Liabilities	'	'
Derivative liabilities	-86	-2,010
Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	42	86
Liabilities	'	'
Derivative liabilities	-229	-278
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	1,816	1,423
Liabilities	'	'
Derivative liabilities	-315	-2,288
Significant Unobservable Inputs (Level 3) [Member] | Commodity Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	1,774	1,337
Liabilities	'	'
Derivative liabilities	-86	-2,010
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Derivative Contracts [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Assets	'	'
Derivative assets	42	86
Liabilities	'	'
Derivative liabilities	($229)	($278)

Financial_Instruments_Schedule1

Financial Instruments - Schedule of Changes in Fair Value of Financial Assets and Liabilities Classified as Level 3 (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Significant Unobservable Inputs (Level 3) [Member]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'
Net assets (Liabilities) at beginning of period	($865)
Total realized and unrealized gains / losses	'
Included in earnings	-421
Included in other comprehensive income	5
Purchases, sales, issuances and settlements	2,782
Net assets (Liabilities) at end of period	$1,501

Financial_Instruments_Effect_o

Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	$1,816	$1,423
Derivative liabilities	-315	-2,288
Total derivative instruments	1,501	-865
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	42	86
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Derivative Liability Short-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-229	-209
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Derivative Liability Long-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	'	-69
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	362	980
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Other Current Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	1,041	307
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative Liability Short-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-12	-1,667
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Derivative Liability Long-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	'	-25
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Other Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	63	'
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Other Current Assets [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	308	50
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative Liability Short-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-72	-318
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Derivative Liability Long-Term [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	($2)	'

Financial_Instruments_Effect_o1

Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statement of Operations (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	($421)	$2,471
Derivatives Designated as Cash-Flow Hedging Instruments [Member] | Interest Rate Swap [Member] | Interest Expense [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	-210	'
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	565	-437
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Natural Gas Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	-580	331
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Unrealized Gain (Loss) on Derivative Instruments, Net [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	1,796	2,834
Derivatives Not Designated as Cash-Flow Hedging Instruments [Member] | Crude Oil Commodity Contracts [Member] | Realized Gain (Loss) on Derivative Instruments, Net [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of gain/loss recognized in income	($1,992)	($257)

Financial_Instruments_Effect_o2

Financial Instruments - Effect of Derivative Instruments on Condensed Consolidated Statement of Operations (Parenthetical) (Detail) (USD $)	1 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Swaps, settlement dates description	'	'January 2015 through December 2015
Net proceeds from derivative instruments	$276	$703
Gains on settlement of derivative instruments	'	$979
Crude Oil Commodity Contracts [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Swaps, settlement dates description	'	'January 2016 through December 2016

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net Income, Basic	$10,799	$2,232	$16,841	$10,584
Net Income, Diluted	$10,799	$2,232	$16,841	$10,584
Weighted Average Number of Shares Outstanding, Basic	2,356,766	2,415,303	2,367,602	2,448,743
Weighted Average Number of Shares Outstanding, Options	754,847	749,664	753,464	743,966
Weighted Average Number of Shares Outstanding, Diluted	3,111,613	3,164,967	3,121,066	3,192,709
Net Income Per Share, Basic	$4.58	$0.92	$7.11	$4.32
Net Income Per Share, Diluted	$3.47	$0.71	$5.40	$3.32