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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Equipment Loan [Member] | Jul. 31, 2013 Equipment Loan [Member] | Dec. 31, 2013 Interest Rate Swap [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility borrowing capacity | $ 250,000,000 |  |  |  |  |  |
Maturity date of amended and restated credit agreement | Jul. 30, 2017 |  |  |  |  |  |
Maximum percentage of production | 90.00% |  |  |  |  |  |
Restrictions on the payment of dividends, distributions or purchase of treasury stock | 5,000,000 |  |  |  |  |  |
Credit facility borrowing base | 140,000,000 |  |  |  |  |  |
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 December 31, 2013) 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 that range from 2.50% to 3.00%. At December 31, 2013, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.00% and 2.92%, respectively. |  |  |  |  |  |
Percentage for base rate loans at the prime rate | 3.25% |  |  |  | 3.95% |  | 0.563%
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 | 5.00% |  |  |  |  |  |
LIBOR rate loans |  |  | 2.50% | 3.00% |  |  |
Effective LIBOR loan rate | 2.92% |  |  |  |  |  |
Outstanding borrowings under revolving credit facility | 112,500,000 |  |  |  |  |  |
Weighted-average interest rate of borrowings | 3.06% |  |  |  |  |  |
Credit facility remaining borrowing capacity | 27,500,000 |  |  |  |  |  |
Debt instrument basis weighted average interest rate spread on variable rate | 3.58% | 3.81% |  |  |  |  |
Interest swap agreements period | 2 years |  |  |  |  |  |
Company's bank debt |  |  |  |  | 9,400,000 |  | 75,000,000
Equipment Loan, face amount |  |  |  |  |  | 10,000,000 |
Equipment Loan, monthly payment |  |  |  |  | $ 184,000 |  |
Equipment Loan, maturity date |  |  |  |  | Jul. 31, 2018 |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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