Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Reportable Segments - Results of Operations by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenues:        
Revenues $ 242,012 $ 237,762 $ 725,471 $ 630,851
Operating gross margin:        
Total operating gross margin 45,066 48,733 117,414 119,883
General and administration expense (9,370) (14,238) (25,341) (49,286)
Gain (loss) on disposition of assets, net (457) 1,094 433 2,759
Total operating income 35,239 35,589 92,506 73,356
Interest expense (10,848) (13,127) (33,486) (33,874)
Interest income 36 130 156 2,392
Loss on extinguishment of debt 0 (5,218) (30,152) (5,218)
Change in fair value of derivative positions 0 0 0 54
Other (536) (144) 1,391 (805)
Income before income taxes 23,891 17,230 30,415 35,905
Rental Tools [Member]
       
Revenues:        
Revenues 87,711 89,614 255,387 228,717
Operating gross margin:        
Total operating gross margin 19,652 25,816 50,761 72,469
U.S. Barge Drilling [Member]
       
Revenues:        
Revenues 39,630 33,919 110,408 102,085
Operating gross margin:        
Total operating gross margin 15,284 12,236 39,655 37,656
U.S. Drilling [Member]
       
Revenues:        
Revenues 19,687 18,693 59,143 48,238
Operating gross margin:        
Total operating gross margin 1,307 103 4,072 (4,618)
International Drilling [Member]
       
Revenues:        
Revenues 88,173 88,562 265,396 236,394
Operating gross margin:        
Total operating gross margin 7,810 10,425 20,395 13,858
Technical Services [Member]
       
Revenues:        
Revenues 6,811 6,974 35,137 15,417
Operating gross margin:        
Total operating gross margin $ 1,013 $ 153 $ 2,531 $ 518
Exxon Neftegas Limited [Member]
       
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     20.00% 14.30%
Exxon Neftegas Limited [Member] | Rental Tools [Member]
       
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     3.50%  
Exxon Neftegas Limited [Member] | International Drilling [Member]
       
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     43.00%  
Exxon Neftegas Limited [Member] | Technical Services [Member]
       
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer     68.00%