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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 26, 2015 | Dec. 31, 2014 | Aug. 31, 2014 | Dec. 31, 2015 | Jul. 29, 2014 | Jul. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum percentage of production |  |  |  | 90.00% |  |
Restrictions on the payment of dividends, distributions or purchase of treasury stock |  |  |  | $ 5,000,000 |  |
Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maturity date of amended and restated credit agreement |  |  |  | Jul. 30, 2017 |  |
Credit facility borrowing base |  |  |  | $ 95,000,000 |  |
Credit facility, interest rate description |  |  |  | The Company's borrowing rates in the credit facility provide for base rate loans at the prime rate (3.50% at December 31, 2015) plus applicable margin utilization rates that range from 1.75% to 2.50%, and LIBO rate loans at LIBO published rates plus applicable utilization rates that range from 2.75% to 3.00%. At December 31, 2015, the Company had in place one base rate loan and one LIBO rate loan with effective rates of 5.50% and 3.25%, respectively. |  |
Outstanding borrowings under revolving credit facility |  |  |  | $ 86,000,000 |  |
Weighted-average interest rate of borrowings |  |  |  | 3.36% |  |
Credit facility remaining borrowing capacity |  |  |  | $ 9,000,000 |  |
Interest swap agreements period |  |  |  | 2 years |  |
Settlement of interest rate swaps |  |  |  | $ 284,000 |  |
Additional Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  | 3.40% |  |  |
Credit facility remaining borrowing capacity |  |  | $ 1,200,000 |  |  |
Company's bank debt |  |  |  | $ 4,060,000 |  |
Equipment Loan, face amount |  |  |  |  | $ 6,000,000 |
Equipment Loan, monthly payment |  |  | 87,800 |  |  |
Equipment Loan, maturity date |  |  |  | Jul. 31, 2019 |  |
Additional equipment Loan, drawings |  | $ 500,000 | $ 4,800,000 |  |  |
Equipment Loan, interest rate description |  |  |  | Interim draws on this facility carried a floating interest rate, payable monthly at the LIBO published rate plus 2.50% and on June 26, 2015 converted into a fixed term loan requiring monthly payments |  |
Revolving Line of Credit and Letter of Credit Facility [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility borrowing capacity |  |  |  | $ 250,000,000 |  |
Fixed Term Loan [Member] | Additional Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Equipment Loan, monthly payment | $ 8,700 |  |  |  |  |
Equipment Loan, maturity date |  |  |  | Jun. 26, 2020 |  |
Prime Rate [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  | 3.50% |  |
Base Rate [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  | 5.50% |  |
London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  | 3.25% |  |
London Interbank Offered Rate (LIBOR) [Member] | Additional Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans |  |  |  | 2.50% |  |
Base Rate and Libor [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument basis weighted average interest rate spread on variable rate |  | 3.53% |  | 3.44% |  |
Equipment Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  | 3.95% |  |
Company's bank debt |  |  |  | $ 5,580,000 |  |
Equipment Loan, face amount |  |  |  |  |  | $ 10,000,000
Equipment Loan, monthly payment |  |  |  | $ 184,000 |  |
Equipment Loan, maturity date |  |  |  | Jul. 31, 2018 |  |
Minimum [Member] | Prime Rate [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans |  |  |  | 1.75% |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans |  |  |  | 2.75% |  |
Maximum [Member] | Prime Rate [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans |  |  |  | 2.50% |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
LIBOR rate loans |  |  |  | 3.00% |  |
Interest Rate Swap [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Swap agreement date |  |  |  | 2012-07 |  |
Commenced date |  |  |  | 2014-01 |  |
Termination date |  |  |  | 2016-01 |  |
Company's bank debt |  |  |  | $ 75,000,000 |  |
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | Credit Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Percentage for base rate loans at the prime rate |  |  |  | 0.563% |  |

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: 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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