Annual report pursuant to Section 13 and 15(d)

Reportable Segments - Additional Information (Details)

v3.19.3.a.u2
Reportable Segments - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
business_line
Sep. 30, 2019
business_line
segment
Dec. 31, 2019
business_line
segment
Segment Reporting Information [Line Items]      
Number of business lines | business_line 2 2 2
Number of reportable segments   4  
Rental tools services      
Segment Reporting Information [Line Items]      
Number of reportable subsegments     2
Drilling services      
Segment Reporting Information [Line Items]      
Number of reportable subsegments     2