Commitments and Contingencies - Concentrations of Credit Risk (Detail) - Customer Concentration Risk - Customer |
9 Months Ended | ||
|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
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| Concentration Risk [Line Items] | |||
| Number of customers representing ten percent or more of net receivable position | 0 | 0 | |
| Number of customers representing ten percent or more of revenue | 0 | ||
| Oil and Gas Infrastructure Services Segment | |||
| Concentration Risk [Line Items] | |||
| Number of customers representing ten percent or more of revenue | 1 | ||
| Consolidated Revenues | Oil and Gas Infrastructure Services Segment | |||
| Concentration Risk [Line Items] | |||
| Concentration risk percentage | 10.00% | ||
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- Definition Number Of Customers Representing Ten Percent Or More Of Net Receivable Position No definition available.
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- Definition Number of customers representing 10% or more of revenues No definition available.
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- Definition 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. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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