Segment Reporting - Summarized Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenues
Revenues	$ 322,660	$ 428,246
Segment contribution margin
Segment contribution margin	75,738	73,641
Operating costs of idled facilities and excess railcar capacity	6,952	6,955
Selling, general, and administrative	33,447	41,960
Depreciation, depletion, and amortization	34,830	58,095
Restructuring and other charges	5,499	2,002
Other operating income, net	(2,268)	(6,859)
Loss from operations	(2,722)	(28,512)
Interest expense, net	23,583	25,603
Other non-operating expense, net	2,912	2,187
Loss before benefit for income taxes	(29,217)	(56,302)
Energy [Member]
Revenues
Revenues	152,373	236,075
Segment contribution margin
Segment contribution margin	21,538	22,019
Industrial [Member]
Revenues
Revenues	170,287	192,171
Segment contribution margin
Segment contribution margin	$ 54,200	$ 51,622

Contribution margin.

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Restructuring and other charges.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The net amount of operating interest income (expense).

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of income (expense) related to nonoperating activities, classified as other.

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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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