Restructuring (Narrative) (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	$ 14,747,000	$ 0	$ 14,747,000	$ 18,500,000
Restructuring Reserve [Roll Forward]
Restructuring Reserve			6,300,000
Restructuring Charges	(100,000)
Restructuring Reserve, Utilization	(4,200,000)
Restructuring Reserve	2,000,000		2,000,000		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 Charges	(200,000)
Restructuring Reserve, Utilization	(2,400,000)
Restructuring Reserve	2,000,000		2,000,000		4,600,000
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 Charges	100,000
Restructuring Reserve, Utilization	(1,800,000)
Restructuring Reserve	0		0		1,700,000
Contract Termination [Member] | Repositioning Actions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					$ 500,000