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Operations by Business Segment and Geographic Area - Concentrations (Details) - Customer concentration - Consolidated revenue - Single customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Energy & Chemicals
Concentration risk
Concentration risk (as a percentage)	13.00%	10.00%	11.00%
Government Segment
Concentration risk
Concentration risk (as a percentage)	15.00%	13.00%	12.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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