Financial Information by Segment & Geographic Area - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2014 Segment	Sep. 30, 2015 Segment Business_Unit
Segment Reporting Information [Line Items]
Number of business reportable segments	4	4
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Number of business reportable segments			1
Number of business activity | Business_Unit			2