Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Goodwill [Roll Forward]
December 31, 2013	$ 108,671
Foreign currency translation adjustment	(10,444)
December 31, 2014	98,227
High Performance Foams [Member]
Goodwill [Roll Forward]
December 31, 2013	24,205
Foreign currency translation adjustment	(640)
December 31, 2014	23,565
Advanced Connectivity Solutions [Member]
Goodwill [Roll Forward]
December 31, 2013	0
Foreign currency translation adjustment	0
December 31, 2014	0
Power Electronics Solutions [Member]
Goodwill [Roll Forward]
December 31, 2013	82,242
Foreign currency translation adjustment	(9,804)
December 31, 2014	72,438
Other [Member]
Goodwill [Roll Forward]
December 31, 2013	2,224
Foreign currency translation adjustment	0
December 31, 2014	$ 2,224