Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Reportable Segments - Results of Operations by Reportable Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues:        
Revenues $ 118,308 $ 97,189 $ 326,186 $ 332,979
Operating gross margin:        
Total operating gross margin 121 (21,965) (30,640) (55,618)
General and administrative expense (7,033) (7,424) (20,576) (25,200)
Provision for reduction in carrying value of certain assets       (1,088)
Gain (loss) on disposition of assets, net 97 (187) (368) (249)
Total operating income (loss) (6,815) (29,576) (51,584) (81,067)
Interest expense (11,067) (11,015) (33,032) (34,764)
Interest income 128 9 160 48
Other (638) (351) 452 1,776
Income (loss) before income taxes (18,392) (40,933) $ (84,004) $ (114,007)
Exxon Neftegas Limited [Member]        
Segment Reporting Information [Line Items]        
Concentration Risk, Other Risk     0.236 0.28
Percentage of revenue from major customer     32.60% 39.60%
Reimbursement Revenue     $ 39,900 $ 54,300
BP Exploration Alaska, Inc. [Member]        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     10.00%  
Drilling Services [Member]        
Revenues:        
Revenues 67,311 66,738 $ 197,449 230,435
Operating gross margin:        
Total operating gross margin (2,434) (8,615) (18,739) (17,910)
Drilling Services [Member] | U.S. Operations [Member]        
Revenues:        
Revenues 4,585 1,431 10,843 4,581
Operating gross margin:        
Total operating gross margin (3,516) (8,686) (15,278) (26,257)
Drilling Services [Member] | International Operations [Member]        
Revenues:        
Revenues 62,726 65,307 186,606 225,854
Operating gross margin:        
Total operating gross margin 1,082 71 $ (3,461) $ 8,347
Drilling Services [Member] | Exxon Neftegas Limited [Member] | International Operations [Member]        
Segment Reporting Information [Line Items]        
Concentration Risk, Other Risk     0.469 0.456
Percentage of revenue from major customer     56.90% 58.40%
Drilling Services [Member] | BP Exploration Alaska, Inc. [Member] | International Operations [Member]        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     17.50%  
Rental Tools [Member]        
Revenues:        
Revenues 50,997 30,451 $ 128,737 $ 102,544
Operating gross margin:        
Total operating gross margin 2,555 (13,350) (11,901) (37,708)
Rental Tools [Member] | U.S. Operations [Member]        
Revenues:        
Revenues 35,677 14,967 85,613 55,483
Operating gross margin:        
Total operating gross margin 8,556 (6,645) 7,746 (16,069)
Rental Tools [Member] | International Operations [Member]        
Revenues:        
Revenues 15,320 15,484 43,124 47,061
Operating gross margin:        
Total operating gross margin $ (6,001) $ (6,705) $ (19,647) $ (21,639)