Acquisitions (Narrative) (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2012	Dec. 11, 2013
Business Acquisition [Line Items]
Business Combination, Integration Related Costs		$ 2,200,000	$ 1,000,000	$ 5,600,000	$ 7,700,000
Inventory and Backlog Amortization					4,800,000
Restructuring Charges		$ 1,400,000	2,200,000	$ 8,700,000	15,500,000
MEI Conlux Holdings [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 804,000,000
Sales reported by acquired entity							$ 399,000,000
2.75% Notes Due 2018
Business Acquisition [Line Items]
Notes Issued	250,000,000
Debt Instrument, Interest Rate, Stated Percentage		2.75%		2.75%		2.75%		2.75%
Four Point Four Five Percent Notes Due 2023 [Member]
Business Acquisition [Line Items]
Notes Issued	$ 300,000,000
Debt Instrument, Interest Rate, Stated Percentage								4.45%
Acquisition Related Restructuring [Member]
Business Acquisition [Line Items]
Restructuring Charges				$ 300,000		$ 10,300,000
Acquisition Related Restructuring [Member]
Business Acquisition [Line Items]
Restructuring Charges			$ 100,000	$ 200,000	$ 5,700,000