Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Concentrations of Credit Risk (Detail)

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Commitments and Contingencies - Concentrations of Credit Risk (Detail) - Customer Concentration Risk - Customer
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Concentration Risk [Line Items]          
Number of customers representing ten percent or more of net receivable position 0   0   0
Number of customers representing ten percent or more of revenue 0   0    
Oil and Gas Infrastructure Services Segment          
Concentration Risk [Line Items]          
Number of customers representing ten percent or more of revenue   1   1  
Sales Revenue, Net | Oil and Gas Infrastructure Services Segment          
Concentration Risk [Line Items]          
Concentration risk percentage   10.00%   10.00%