Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill by Segment) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning Balance	$ 105,041
Foreign currency translation adjustment	3,630
Ending Balance	108,671
High Performance Foams [Member]
Goodwill [Roll Forward]
Beginning Balance	23,973
Foreign currency translation adjustment	232
Ending Balance	24,205
Printed Circuit Materials [Member]
Goodwill [Roll Forward]
Beginning Balance	0
Foreign currency translation adjustment	0
Ending Balance	0
Power Electronics Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	78,844
Foreign currency translation adjustment	3,398
Ending Balance	82,242
Other [Member]
Goodwill [Roll Forward]
Beginning Balance	2,224
Foreign currency translation adjustment	0
Ending Balance	$ 2,224