Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)
Segment Reporting Information
Number of reportable segments \| Segment	2
Industrial & Specialty Products segment, description	The Industrial & Specialty Products segment consists of over 250 products and materials used in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products.
Goodwill		$ 68,647
Operating Segments
Segment Reporting Information
Goodwill	$ 68,647
Operating Segments \| Oil and Gas Proppants
Segment Reporting Information
Goodwill	47,900
Operating Segments \| Industrial and Specialty Products
Segment Reporting Information
Goodwill	$ 20,700

Description of the types of products and services from which the reportable segment derives its revenue.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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.

+ References

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