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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Revenues:          
Revenues $ 237,762 $ 165,301 $ 630,918 $ 520,795  
Operating gross margin:          
Total operating gross margin 48,139 34,038 118,908 134,496  
General and administrative expense (14,188) [1] (8,905) [1] (49,449) [1] (21,822) [1]  
Gain on disposition of assets, net 1,094 606 2,759 2,466  
Total operating income 35,045 25,739 72,218 115,140  
Interest expense (13,127) (8,171) (33,874) (25,133)  
Interest income 130 30 2,392 109  
Loss on extinguishment of debt (5,218) (117) (5,218) (1,766)  
Changes in fair value of derivative positions 0 19 54 8  
Other 400 26 333 62  
Income before income taxes 17,230 17,526 35,905 88,420  
Assets 1,535,380 1,255,733 1,535,380 1,255,733 1,255,733
Rental Tools [Member]
          
Revenues:          
Revenues 89,614 59,947 228,718 191,233  
Operating gross margin:          
Total operating gross margin 25,816 [2] 27,032 [2] 72,470 [2] 91,885 [2]  
U.S. Barge Drilling [Member]
          
Revenues:          
Revenues 33,919 33,142 102,085 94,269  
Operating gross margin:          
Total operating gross margin 12,236 [2] 11,042 [2] 37,657 [2] 29,215 [2]  
U.S. Drilling [Member]
          
Revenues:          
Revenues 18,693 0 48,238 0  
Operating gross margin:          
Total operating gross margin 103 [2] (4,712) [2] (4,618) [2] (7,881) [2]  
International Drilling [Member]
          
Revenues:          
Revenues 88,562 [3] 68,503 [3] 236,394 [3] 224,176 [3]  
Operating gross margin:          
Total operating gross margin 9,831 [2] 783 [2] 12,815 [2] 21,395 [2]  
Technical Services [Member]
          
Revenues:          
Revenues 6,974 3,709 15,483 11,117  
Operating gross margin:          
Total operating gross margin 153 [2] (107) [2] 584 [2] (118) [2]  
Other Segments [Member]
          
Operating gross margin:          
Assets 1,293,678 1,083,349 1,293,678 1,083,349  
Other Segments [Member] | Rental Tools [Member]
          
Operating gross margin:          
Assets 375,900 194,600 375,900 194,600  
Other Segments [Member] | U.S. Barge Drilling [Member]
          
Operating gross margin:          
Assets 84,402 99,409 84,402 99,409  
Other Segments [Member] | U.S. Drilling [Member]
          
Operating gross margin:          
Assets 367,020 374,794 367,020 374,794  
Other Segments [Member] | International Drilling [Member]
          
Operating gross margin:          
Assets 466,356 414,546 466,356 414,546  
Corporate Assets [Member]
          
Operating gross margin:          
Assets $ 241,702 [4] $ 172,384 [4] $ 241,702 [4] $ 172,384 [4]  
[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] For the nine months ended September 30, 2013, our largest customer, Exxon Neftegas Limited, constituted 14.3% of our total consolidated revenues and approximately 36.9% of our International Drilling segment. For the nine months ended September 30, 2012, our two largest customers, Exxon Neftegas Limited (ENL) and Schlumberger, constituted approximately 10.6% and 10.2%, respectively, of our total consolidated revenues and approximately 32.0% and 24.0%, respectively, of our International Drilling segments.
[4] This category includes corporate assets as well as minimal assets for our Technical Services segment primarily related to office furniture and fixtures.