Goodwill And Intangible Assets (Summary Of Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	14 years 4 months 24 days
Gross Asset	$ 581,093	$ 591,952
Accumulated Amortization	209,526	183,029
Net	371,567	408,923
Finite-Lived Intangible Assets, Net	371,567	408,923	125,913
Intellectual Property Rights
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	16 years 6 months
Gross Asset	93,067	95,052
Accumulated Amortization	50,328	48,960
Net	42,739	46,092
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	13 years 9 months 24 days
Gross Asset	412,752	420,951
Accumulated Amortization	108,292	86,556
Net	304,460	334,395
Drawings
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	37 years 10 months 24 days
Gross Asset	11,149	11,149
Accumulated Amortization	10,027	9,951
Net	1,122	1,198
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	12 years 9 months 12 days
Gross Asset	64,125	64,800
Accumulated Amortization	40,879	37,562
Net	$ 23,246	$ 27,238