Discontinued Operations (Details) (USD $)	3 Months Ended			12 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 31, 2010 Simpson Dura-Vent Company, Inc. Y	Jun. 30, 2010 Simpson Dura-Vent Company, Inc.	Dec. 31, 2010 Simpson Dura-Vent Company, Inc.
Details related to discontinued operations
Sale price received on closing					$ 28,346,000		$ 27,700,000
Results from discontinued operations
Net sales					33,372,000	58,526,000
Cost of sales					28,073,000	49,851,000
Gross profit					5,299,000	8,675,000
Operating expenses					6,683,000	11,560,000
Impairment charge					21,350,000
Loss on sale of discontinued operations					657,000		657,000
Other expenses					28,000	101,000
Loss from discontinued operations					(23,419,000)	(2,986,000)
Benefit from income taxes from discontinued operations					(7,207,000)	(1,082,000)
Loss from discontinued operations, net of tax	(1,226,000)	(14,356,000)	(631,000)		(16,212,000)	(1,904,000)
Sale of net assets and liabilities of Simpson Dura-Vent, valued at their book value
Accounts receivable							11,925,000
Inventory							18,164,000
Other current assets							30,000
Accounts payable							(436,000)
Other current liabilities							(680,000)
Total net assets sold							29,003,000
Impaired assets consisted of:
Goodwill				1,282,000	10,727,000			4,400,000	4,435,000
Intangible assets								1,600,000
Fixed assets				1,094,000	419,000			10,700,000
Inventory				750,000	5,046,000	900,000		3,800,000
Other non-current assets								200,000
Approximate lease revenue per year							$ 900,000
Lease term of entity's facilities in Vacaville (in years)							10