Business Segment, Geographic and Major Customer Information - Additional Disclosures (Details) - segment	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Number of reportable segments			4
Customer Concentration Risk [Member] | Customer A [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Percentage of revenue by major customers (percent)	15.50%	19.50%	18.30%	15.80%
Customer Concentration Risk [Member] | Customer B [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Percentage of revenue by major customers (percent)	11.80%	12.10%	11.30%	11.20%
Customer Concentration Risk [Member] | Major Customers [Member] | Sales [Member] | Energy Chemistry Technologies [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Percentage of revenue by major customers (percent)			95.00%