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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenues:        
Revenues $ 185,941 $ 254,234 $ 390,017 $ 483,459
Operating gross margin:        
Total operating gross margin 4,021 43,485 28,288 72,348
General and administration expense (9,511) (7,007) (20,348) (15,971)
Other Asset Impairment Charges (2,316) 0 (2,316) 0
Gain (loss) on disposition of assets, net (138) 1,019 2,303 890
Total operating income (loss) (7,944) 37,497 7,927 57,267
Interest expense (11,396) (10,599) (22,474) (22,638)
Interest income 19 88 202 120
Loss on extinguishment of debt 0 (479) 0 (30,152)
Other (1,529) 1,032 (2,909) 1,927
Income (loss) before income taxes (20,850) 27,539 (17,254) 6,524
Rental Tools [Member]        
Revenues:        
Revenues 64,124 87,169 140,182 167,677
Operating gross margin:        
Total operating gross margin 4,729 17,764 17,354 31,111
U.S. (Lower 48) Drilling [Member]        
Revenues:        
Revenues 6,848 46,085 20,945 81,872
Operating gross margin:        
Total operating gross margin (7,552) 17,808 (13,274) 26,548
International & Alaska Drilling [Member]        
Revenues:        
Revenues 114,969 120,980 228,890 233,910
Operating gross margin:        
Total operating gross margin $ 6,844 $ 7,913 $ 24,208 $ 14,689
Exxon Neftegas Limited [Member]        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     26.00% 17.90%
Exxon Neftegas Limited [Member] | International & Alaska Drilling [Member]        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     44.30% 37.10%