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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Revenues:          
Revenues $ 226,001 $ 178,925 $ 393,156 $ 355,494  
Operating gross margin:          
Total operating gross margin 50,172 46,440 70,769 100,458  
General and administrative expense (22,378) [1] (7,420) [1] (35,261) [1] (12,917)  
Gain on disposition of assets, net 517 1,368 1,665 1,860  
Total operating income 28,311 40,388 37,173 89,401  
Interest expense (10,741) (8,925) (20,747) (16,962)  
Changes in fair value of derivative positions 17 38 54 (11)  
Interest income 2,203 53 2,251 79  
Loss on extinguishment of debt 0 (1,649) 0 (1,649)  
Other (183) 20 (56) 36  
Income before income taxes 19,607 29,925 18,675 70,894  
Assets 1,436,537 1,255,733 1,436,537 1,255,733 1,255,733
Rental Tools [Member]
          
Revenues:          
Revenues 82,022 65,002 139,105 131,286  
Operating gross margin:          
Total operating gross margin 25,149 [2] 31,251 [2] 46,656 [2] 64,853 [2]  
U.S. Barge Drilling [Member]
          
Revenues:          
Revenues 38,301 33,292 68,165 61,127  
Operating gross margin:          
Total operating gross margin 16,660 [2] 11,014 [2] 25,417 [2] 18,171 [2]  
U.S. Drilling [Member]
          
Revenues:          
Revenues 17,910 0 29,545 0  
Operating gross margin:          
Total operating gross margin (666) [2] (1,623) [2] (4,719) [2] (3,170) [2]  
International Drilling [Member]
          
Revenues:          
Revenues 83,182 [3] 76,923 [3] 147,832 [3] 155,673 [3]  
Operating gross margin:          
Total operating gross margin 8,925 [2] 6,056 [2] 2,983 [2] 20,615 [2]  
Technical Services [Member]
          
Revenues:          
Revenues 4,586 3,708 8,509 7,408  
Operating gross margin:          
Total operating gross margin 104 [2] (258) [2] 432 [2] (11) [2]  
Other Segments [Member]
          
Operating gross margin:          
Assets 1,307,860 1,083,349 1,307,860 1,083,349  
Other Segments [Member] | Rental Tools [Member]
          
Operating gross margin:          
Assets 368,371 194,600 368,371 194,600  
Other Segments [Member] | U.S. Barge Drilling [Member]
          
Operating gross margin:          
Assets 111,711 99,409 111,711 99,409  
Other Segments [Member] | U.S. Drilling [Member]
          
Operating gross margin:          
Assets 340,773 374,794 340,773 374,794  
Other Segments [Member] | International Drilling [Member]
          
Operating gross margin:          
Assets 487,005 414,546 487,005 414,546  
Corporate Segment [Member]
          
Operating gross margin:          
Assets $ 128,677 $ 172,384 $ 128,677 $ 172,384  
[1] General and administration expenses for field operations are included in operating expenses.
[2] Operating gross margin is calculated as revenues less direct operating expenses, including depreciation and amortization expense.(3)This category includes corporate assets as well as minimal assets for our Technical Services segment primarily related to office furniture and fixtures.
[3] In the second quarter of 2013, our largest customer, Exxon Neftegas Limited (ENL), constituted 13.9% of our total consolidated revenues and approximately 37.7% of our International Drilling segment. In the second quarter of 2012, no single customer contributed 10% or more of our year-to-date consolidated revenues.