Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	6 Months Ended	12 Months Ended
Jun. 30, 2015 USD ($) Guarantors	Dec. 31, 2014
7.75% Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	7.75%
Maturity date	Aug. 01, 2019
Debt instrument, frequency of interest payment	Interest is to be paid semiannually on February 1st and August 1st
Number of unsecured guarantors \| Guarantors	2
Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	5.25%
Maturity date	Mar. 26, 2021
Proceeds of the Secured Promissory Note	$ 16,200,000
Secured promissory note, payment term	Interest only is payable monthly for the first 12 months of the term. Principal and interest are payable monthly for the remaining term of the note.
Amended Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Limit of consolidated leverage ratio	250.00%
Limit of cumulative consolidated net income or loss	50.00%
Limit of joint ventures	$ 35,000,000
Amended working capital revolver loan requirements	Fixed Charge Coverage Ratio, as defined in the amendment, is greater than 2.0 to 1.0.
Maximum amount of revolving credit facility	$ 100,000,000
Letters of credit maximum capacity	$ 15,000,000
Maturity date	Apr. 13, 2018
Amended Working Capital Revolver Loan [Member] \| Zena Energy LLC [Member]
Debt Instrument [Line Items]
Limit of investment in subsidiary	$ 50,000,000
7.75% Senior Secured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	7.75%	7.75%
Maturity year	2019	2019
Secured Promissory Note Due 2016 [Member]
Debt Instrument [Line Items]
Maturity year	2016	2016
Secured Promissory Note, interest rate	3.28%	3.28%
Secured Promissory Note Due 2021 [Member]
Debt Instrument [Line Items]
Maturity year	2021	2021
Secured Promissory Note, interest rate	5.25%	5.25%
Other [Member]
Debt Instrument [Line Items]
Weighted-average interest rate of other debt	4.33%	4.33%
Covenants [Member] \| Amended Working Capital Revolver Loan [Member]
Debt Instrument [Line Items]
Loan requirements description	At least 20% of the maximum revolver commitment or $20 million, whichever is greater, being available.

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Debt Instrument Maturity Year

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The maximum amount in investments in a subsidiary under an agreement.

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The maximum amount in investments in joint ventures under an agreement.

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Maximum letter of credit capacity under a line of credit facility.

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Percentage of defined investment which may not exceed cumulative consolidated net income or loss since a defined date.

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The description of requirements under an agreement to be eligible to enter into certain transactions.

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The number of unsecured guarantors in an agreement.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Weighted average interest rate of long-term debt outstanding.

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The cash inflow from borrowings supported by a written promise to pay an obligation that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

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