Capitalized Software, Estimated Useful Life

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- Definition

Cash Equivalents, Maturity Period

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- Definition

Number of Acres of Land and Leasehold Interests

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- Definition

Number of Projects Terminated

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- Definition

Percentage Of Projects Completion

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- Definition

Percentage of suspended assets.

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- Definition

Receivable, Collection Period

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- Definition

Significant Accounting Policies [Line Items]

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- Definition

Tax Deficiency

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Tax Deficiency Per Share

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- Definition

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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- Definition

Amount of the cumulative effect on retained earnings net of related income tax effect.

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- Definition

Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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- Definition

Amount, before allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

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- Definition

The capitalized costs incurred during the period (excluded from amortization) to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. Depreciation, depletion, and amortization of capitalized acquisition, exploration, and development costs are not production costs but also become part of the cost of oil and gas produced along with production (lifting) costs identified above.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) a Project $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Severance costs		$ 6,426,000	$ 9,497,000
Number of projects suspended \| Project		2
Percentage of suspended assets relating to two projects		94.00%
Projects completed percentage		90.00%
Allowance for doubtful accounts		$ 2,804,000	2,688,000
Other receivables		650,000	300,000
Lower of cost or market inventory adjustment		1,515,000	4,546,000	$ 5,363,000
Production cost		47,318,000	33,724,000	0
Research and development expenses		3,817,000	$ 7,047,000	$ 10,855,000
Accounting Standards Update 2016-09
Significant Accounting Policies [Line Items]
Cumulative effect reduction to retained earnings	$ 697,000
Tax deficiencies		$ 789,000
Tax deficiencies, per share \| $ / shares		$ 0.03
Georgia and Alabama
Significant Accounting Policies [Line Items]
Area of land and leasehold interests \| a		4,618
Marshfield, Wisconsin
Significant Accounting Policies [Line Items]
Area of land and leasehold interests \| a		113
Maximum
Significant Accounting Policies [Line Items]
Receivables collection period		30 days
Maturity period for all highly liquid investments when purchased to be cash equivalents		3 months
Capitalized software estimated useful life		5 years