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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenues:        
Revenues $ 254,234 $ 225,954 $ 483,459 $ 393,090
Operating gross margin:        
Total operating gross margin 43,485 50,273 72,348 71,151
General and administrative expense (7,007) (22,203) (15,971) (35,049)
Gain on disposition of assets, net 1,019 517 890 1,665
Total operating income 37,497 28,587 57,267 37,767
Interest expense (10,599) (10,741) (22,638) (20,747)
Interest income 88 2,203 120 2,262
Loss on extinguishment of debt (479) 0 (30,152) 0
Gain (Loss) on Derivative Instruments, Net, Pretax 0 17 0 54
Other 1,032 (459) 1,927 (661)
Income before income taxes 27,539 19,607 6,524 18,675
Rental Tools [Member]
        
Revenues:        
Revenues 87,169 [1] 82,022 [1] 167,677 139,105
Operating gross margin:        
Total operating gross margin 17,764 [2] 25,149 [2] 31,111 [2] 46,655 [2]
U.S. Barge Drilling [Member]
        
Revenues:        
Revenues 40,289 [1] 38,301 [1] 70,778 68,165
Operating gross margin:        
Total operating gross margin 16,551 [2] 16,660 [2] 24,371 [2] 25,417 [2]
U.S. Drilling [Member]
        
Revenues:        
Revenues 20,039 [1] 17,910 [1] 39,456 29,545
Operating gross margin:        
Total operating gross margin 1,124 [2] (666) [2] 2,765 [2] (4,719) [2]
International Drilling [Member]
        
Revenues:        
Revenues 91,754 [1] 83,182 [1] 177,222 [1] 147,832 [1]
Operating gross margin:        
Total operating gross margin 7,105 [2] 9,073 [2] 12,582 [2] 3,432 [2]
Technical Services [Member]
        
Revenues:        
Revenues 14,983 [1] 4,539 [1] 28,326 8,443
Operating gross margin:        
Total operating gross margin $ 941 [2] $ 57 [2] $ 1,519 [2] $ 366 [2]
Exxon Neftegas Limited [Member]
        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer 17.50% 13.90% 17.90% 14.30%
Exxon Neftegas Limited [Member] | International Drilling [Member]
        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer 39.00% 37.70% 40.50%  
Exxon Neftegas Limited [Member] | Technical Services [Member]
        
Segment Reporting Information [Line Items]        
Percentage of revenue from major customer 58.40%   52.60%  
[1] For the six months ended June 30, 2014, our largest customer, ENL, constituted 17.9% of our total consolidated revenues and approximately 40.5% and 52.6% of our International Drilling and Technical Services segment revenues, respectively. For the six months ended June 30, 2013, our largest customer, ENL, constituted approximately 14.3% of our total consolidated revenues.
[2] Operating gross margin is calculated as revenues less direct operating expenses, including depreciation and amortization expense.