Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
Reportable Segments - Results of Operations by Reportable Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                        
Percentage of revenue from major customer                   38.70%    
Revenues:                        
Revenues $ 94,025 $ 97,189 $ 105,287 $ 130,503 $ 148,748 $ 173,418 $ 185,941 $ 204,076   $ 427,004 $ 712,183 $ 968,684
Operating income:                        
Total operating gross margin (19,694) (21,965) (20,225) (13,428) (3,460) 4,871 4,021 24,267   (75,312) 29,699 154,182
General and administrative expense                   (34,332) (36,190) (35,016)
Provision for reduction in carrying value of certain assets (4,300) (4,800)             $ (3,200) 0 (12,490) 0
Gain (loss) on disposition of assets, net                   (1,613) 1,643 1,054
Total operating income (loss) (30,190) $ (29,576) $ (28,222) $ (23,269) (20,718) $ (4,547) $ (7,944) $ 15,871   (111,257) (17,338) 120,220
Interest expense                   (45,812) (45,155) (44,265)
Interest income                   58 269 195
Loss on extinguishment of debt                   0 0 (30,152)
Other                   367 (9,747) 2,539
Income (loss) before income taxes                   (156,644) (71,971) 48,537
Identifiable assets:                        
Total identifiable assets 965,468       1,161,186         965,468 1,161,186  
Total assets 1,103,551       1,366,702         1,103,551 1,366,702  
U.S. (Lower 48) Drilling [Member]                        
Revenues:                        
Revenues                   5,429 30,358 158,405
Operating income:                        
Total operating gross margin                   (34,353) (28,309) 46,831
Identifiable assets:                        
Total identifiable assets 77,628       102,121         77,628 102,121  
International & Alaska Drilling [Member]                        
Revenues:                        
Revenues                   287,332 435,096 462,513
Operating income:                        
Total operating gross margin                   9,272 45,211 34,405
Identifiable assets:                        
Total identifiable assets 591,120       629,784         591,120 629,784  
Drilling Services [Member]                        
Revenues:                        
Revenues                   292,761 465,454 620,918
Operating income:                        
Total operating gross margin                   (25,081) 16,902 81,236
Rental Tools [Member]                        
Revenues:                        
Revenues                   71,613 141,889 223,545
Operating income:                        
Total operating gross margin                   (22,372) 17,380 $ 71,790
Identifiable assets:                        
Total identifiable assets $ 126,289       $ 233,085         $ 126,289 $ 233,085  
Exxon Neftegas Limited (ENL) [Member]                        
Segment Reporting Information [Line Items]                        
Concentration Risk, Other Risk                   0.275    
Percentage of revenue from major customer                   38.70%