Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2011	Dec. 30, 2011 Toolbox [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales proceeds from discontinued operations		$ 1,779,000			$ 2,100,000
Carrying value of reporting unit				5,100,000
Total pre-tax impairment loss recognized			12,600,000
Pre-tax impairment loss related to goodwill			9,500,000
Pre-tax impairment loss related to intangible assets			$ 3,100,000
Discount rate related to significant assumptions	19.00%