Schedule of Acquisitions (Detail) (Industrial Materials)	9 Months Ended
Sep. 30, 2013 acquisition	Sep. 30, 2012 acquisition
Industrial Materials
Acquired Finite-Lived Intangible Assets [Line Items]
Number of Acquisitions	3	2

The number of businesses acquired by the entity during the period.

No definition available.

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration