Annual report pursuant to Section 13 and 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 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:                      
Revenues $ 116,334 $ 118,308 $ 109,607 $ 98,271 $ 94,025 $ 97,189 $ 105,287 $ 130,503 $ 442,520 $ 427,004 $ 712,183
Operating income:                      
Total operating gross margin (4,700) 121 (11,016) (19,745) (19,694) (21,965) (20,225) (13,428) (35,340) (75,312) 29,699
General and administrative expense                 (25,676) (34,332) (36,190)
Provision for reduction in carrying value of certain assets                 (1,938) 0 (12,490)
Gain (loss) on disposition of assets, net                 (2,851) (1,613) 1,643
Total operating income (loss) (14,221) $ (6,815) $ (17,632) $ (27,137) (30,190) $ (29,576) $ (28,222) $ (23,269) (65,805) (111,257) (17,338)
Interest expense                 (44,226) (45,812) (45,155)
Interest income                 244 58 269
Other                 126 367 (9,747)
Income (loss) before income taxes                 (109,661) (156,644) (71,971)
Capital expenditures:                      
Total capital expenditures                 54,533 28,954 88,197
Depreciation and amortization:                      
Total depreciation and amortization                 122,373 139,795 156,194
Identifiable assets:                      
Total assets 990,279       1,103,551       990,279 1,103,551  
Operating Segments                      
Identifiable assets:                      
Total assets 851,908       965,468       851,908 965,468  
Corporate                      
Capital expenditures:                      
Total capital expenditures                 2,098 2,859 4,819
Depreciation and amortization:                      
Total depreciation and amortization                 8,700 8,300 7,500
Identifiable assets:                      
Total assets 138,371       138,083       138,371 138,083  
Drilling Services:                      
Revenues:                      
Revenues                 259,643 292,761 465,454
Operating income:                      
Total operating gross margin                 (26,904) (25,081) 16,902
U.S. (Lower 48) Drilling                      
Revenues:                      
Revenues                 12,389 5,429 30,358
Operating income:                      
Total operating gross margin                 (20,656) (34,353) (28,309)
U.S. (Lower 48) Drilling | Operating Segments                      
Capital expenditures:                      
Total capital expenditures                 230 264 2,731
Depreciation and amortization:                      
Total depreciation and amortization                 13,521 20,049 22,420
Identifiable assets:                      
Total assets 62,980       77,628       62,980 77,628  
International & Alaska Drilling                      
Revenues:                      
Revenues                 247,254 287,332 435,096
Operating income:                      
Total operating gross margin                 (6,248) 9,272 45,211
International & Alaska Drilling | Operating Segments                      
Capital expenditures:                      
Total capital expenditures                 3,673 5,258 13,458
Depreciation and amortization:                      
Total depreciation and amortization                 46,950 55,236 64,539
Identifiable assets:                      
Total assets 421,753       591,120       421,753 591,120  
Rental Tools                      
Revenues:                      
Revenues                 182,877 134,243 246,729
Operating income:                      
Total operating gross margin                 (8,436) (50,231) 12,797
U.S. Rental Tools                      
Revenues:                      
Revenues                 121,937 71,613 141,889
Operating income:                      
Total operating gross margin                 15,651 (22,372) 17,380
U.S. Rental Tools | Operating Segments                      
Capital expenditures:                      
Total capital expenditures                 39,948 10,848 47,673
Depreciation and amortization:                      
Total depreciation and amortization                 43,489 43,769 47,453
Identifiable assets:                      
Total assets 198,664       126,289       198,664 126,289  
International Rental Tools                      
Revenues:                      
Revenues                 60,940 62,630 104,840
Operating income:                      
Total operating gross margin                 (24,087) (27,859) (4,583)
International Rental Tools | Operating Segments                      
Capital expenditures:                      
Total capital expenditures                 8,584 9,725 19,516
Depreciation and amortization:                      
Total depreciation and amortization                 18,413 20,741 $ 21,782
Identifiable assets:                      
Total assets $ 168,511       $ 170,431       $ 168,511 $ 170,431