Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Results of Operations by Reportable Segment (Detail)

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Reportable Segments - Results of Operations by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenues:        
Revenues $ 123,395 $ 118,308 $ 351,673 $ 326,186
Operating gross margin:        
Total operating gross margin (loss) 1,932 121 (8,643) (30,640)
General and administrative expense (14,495) (7,033) (28,984) (20,576)
Loss on impairment (43,990) 0 (43,990) 0
Gain (loss) on disposition of assets, net 9 97 (126) (368)
Total operating income (loss) (56,544) (6,815) (81,743) (51,584)
Interest expense (11,350) (11,067) (33,787) (33,032)
Interest income 23 128 76 160
Other (709) (638) (1,609) 452
Income (loss) before income taxes (68,580) (18,392) (117,063) (84,004)
Reimbursable revenue        
Revenues:        
Revenues 13,400 15,000 40,400 45,500
Exxon Neftegas Limited | Reimbursable revenue        
Revenues:        
Revenues     $ 34,600 $ 39,900
Exxon Neftegas Limited | Customer Concentration Risk | Sales Revenue, Net        
Operating gross margin:        
Percentage of revenue from major customer     25.70% 32.60%
Exxon Neftegas Limited | Customer Concentration Risk | Sales Revenue, Net Of Reimbursable Revenues        
Operating gross margin:        
Percentage of revenue from major customer     17.90% 23.60%
BP Exploration Alaska, Inc. | Customer Concentration Risk | Sales Revenue, Net        
Operating gross margin:        
Percentage of revenue from major customer       10.00%
Total Drilling Services        
Revenues:        
Revenues 52,300 67,311 $ 166,335 $ 197,449
Operating gross margin:        
Total operating gross margin (loss) (11,943) (2,434) (30,144) (18,739)
U.S. (Lower 48) Drilling        
Revenues:        
Revenues 4,530 4,585 9,167 10,843
Operating gross margin:        
Total operating gross margin (loss) (3,402) (3,516) (12,443) (15,278)
International & Alaska Drilling        
Revenues:        
Revenues 47,770 62,726 157,168 186,606
Operating gross margin:        
Total operating gross margin (loss) (8,541) 1,082 $ (17,701) $ (3,461)
International & Alaska Drilling | Exxon Neftegas Limited | Customer Concentration Risk | Sales Revenue, Net        
Operating gross margin:        
Percentage of revenue from major customer     57.50% 56.90%
International & Alaska Drilling | Exxon Neftegas Limited | Customer Concentration Risk | Sales Revenue, Net Of Reimbursable Revenues        
Operating gross margin:        
Percentage of revenue from major customer     47.60% 46.90%
International & Alaska Drilling | BP Exploration Alaska, Inc. | Customer Concentration Risk | Sales Revenue, Net Of Reimbursable Revenues        
Operating gross margin:        
Percentage of revenue from major customer       17.50%
Total Rental Tools Services        
Revenues:        
Revenues 71,095 50,997 $ 185,338 $ 128,737
Operating gross margin:        
Total operating gross margin (loss) 13,875 2,555 21,501 (11,901)
U.S. Rental Tools        
Revenues:        
Revenues 50,944 35,677 127,775 85,613
Operating gross margin:        
Total operating gross margin (loss) 16,588 8,556 30,903 7,746
International Rental Tools        
Revenues:        
Revenues 20,151 15,320 57,563 43,124
Operating gross margin:        
Total operating gross margin (loss) $ (2,713) $ (6,001) $ (9,402) $ (19,647)