Business Segment, Geographic and Major Customer Information - Additional Disclosures (Details) - segment	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Number of reportable segments			4
Customer Concentration Risk | Sales | Customer A
Segment Reporting Information [Line Items]
Percentage of revenue by major customers	12.90%	12.80%	11.90%	11.70%
Customer Concentration Risk | Sales | Customer B
Segment Reporting Information [Line Items]
Percentage of revenue by major customers	10.90%	11.30%	15.80%	14.30%
Customer Concentration Risk | Sales | Customer C
Segment Reporting Information [Line Items]
Percentage of revenue by major customers		11.60%
Customer Concentration Risk | Sales | Major Customers | Energy Chemistry Technologies | Minimum
Segment Reporting Information [Line Items]
Percentage of revenue by major customers			95.00%