Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill (Gross)	$ 123,397us-gaap_GoodwillGross	$ 119,332us-gaap_GoodwillGross	$ 119,150us-gaap_GoodwillGross
Accumulated Impairment Losses	(70,004)	(70,004)	(70,004)
Goodwill (Net)	53,393us-gaap_Goodwill	49,328us-gaap_Goodwill	49,146us-gaap_Goodwill
U.S. Insulation [Member]
Goodwill [Line Items]
Goodwill (Gross)	4,065	182
Goodwill (Net)	$ 4,065	$ 182

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.

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

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Amount before 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

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