Unaudited Summarized Quarterly Financial Information (Parenthetical) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Information [Line Items]
Costs associated with the realignment of our operations and legal expenses, net of taxes	$ 1,400,000	$ 600,000	$ 800,000	$ 2,200,000	$ 1,800,000	$ 1,600,000	$ 700,000	$ 2,000,000
Costs associated with prepayment of loans, net of taxes	2,800,000
Settlement of lawsuit net of income tax	2,100,000
Non-cash goodwill and other intangibles impairment charge, net of taxes	110,200,000				3,800,000	434,600,000			162,103,000	579,955,000
Costs associated with our exit activities, net of taxes					3,100,000			700,000		5,300,000	14,600,000
Payment of bonus net of income taxes for performance demonstration							2,900,000
Valuation allowance related to specific deferred tax assets, net of taxes	$ 200,000				$ 800,000	$ 1,900,000			$ 200,000	$ 800,000