Restructuring (Narrative) (Detail) (USD $)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 160,000		$ 14,907,000	$ 18,500,000
Restructuring Reserve [Roll Forward]
Restructuring Reserve		6,300,000
Restructuring Charges		(100,000)
Restructuring Reserve, Utilization		(5,700,000)
Restructuring Reserve		500,000		6,300,000
Prior Restructuring Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				2,000,000
Two Thousand Twelve Restructuring Actions [Member]
Restructuring Cost and Reserve [Line Items]
Reduction of workforce by employees				200
Reduction Of Global Workforce Percentage				2.00%
Repositioning Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				16,500,000
Other Restructuring Costs				1,900,000
Employee Severence and Other [Member] | Repositioning Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				14,600,000
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		4,600,000
Restructuring Charges		(200,000)
Restructuring Reserve, Utilization		(3,900,000)
Restructuring Reserve		500,000
From closure of product lines [Member] | Repositioning Actions [Member]
Restructuring Cost and Reserve [Line Items]
Inventory Write-down				1,600,000
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve		1,700,000
Restructuring Charges		100,000
Restructuring Reserve, Utilization		(1,800,000)
Restructuring Reserve		0
Contract Termination [Member] | Repositioning Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges				$ 500,000