Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Additional Information (Detail)

v3.8.0.1
Reportable Segments - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2017
segment
Segment Information [Line Items]  
Number of Reportable Segments 4
Drilling Services [Member] | U.S. Operations [Member]  
Segment Information [Line Items]  
Number of Reportable Segments 2
Drilling Services [Member] | International Operations [Member]  
Segment Information [Line Items]  
Number of Reportable Segments 2
Rental Tools [Member] | U.S. Operations [Member]  
Segment Information [Line Items]  
Number of Reportable Segments 2
Rental Tools [Member] | International Operations [Member]  
Segment Information [Line Items]  
Number of Reportable Segments 2