Revenue From Contracts With Customers - Narrative (Details)	6 Months Ended
Jun. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Time period of contractual future performance obligations for which value not disclosed (or less)	1 year
Minimum \| Operations Optimization \| Optimization Software & Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Time period of contractual future performance obligations	2 years
Maximum \| Operations Optimization \| Optimization Software & Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Time period of contractual future performance obligations	5 years
Multinational Oil Customer \| Accounts Receivable \| Customer Concentration Risk
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Concentration risk percentage	11.00%

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- Definition

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
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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.

+ References

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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