Registration of securities issued in business combination transactions

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, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:                            
Revenues $ 237,762 $ 157,187 $ 165,301 $ 178,925 $ 176,569 $ 181,066 $ 176,589 $ 172,812 $ 156,179 $ 630,918 $ 520,795 $ 677,982 $ 686,646 $ 659,475
Operating gross margin:                            
Total operating gross margin 48,139 16,405 34,038 46,440 54,018 44,399 49,966 40,797 21,204 118,908 134,496 150,901 156,366 73,167
General and administrative expense (14,188) [1]   (8,905) [1]             (49,449) [1] (21,822) [1] (46,052) (31,314) (30,728)
Impairments and other charges           (170,000)             (170,000)  
Provision for reduction in carrying value of certain assets                       0 (1,350) (1,952)
Gain on disposition of assets, net 1,094   606             2,759 2,466 1,974 3,659 4,620
Total operating income 35,045 (8,317) 25,739 40,388 49,013 (133,215) 41,959 33,215 15,402 72,218 115,140 106,823 (42,639) 45,107
Interest expense (13,127)   (8,171)             (33,874) (25,133) (33,542) (22,594) (26,805)
Changes in fair value of derivative positions (5,218)   19             54 8 55 (110)  
Loss on extinguishment of debt (5,218)   (117)             (5,218) (1,766) (2,130)   (7,209)
Other 400   26             333 62 (382) (325) 155
Income (loss) before income taxes 17,230   17,526             35,905 88,420 70,977 (65,412) 11,505
Interest income 130   30             2,392 109 153 256 257
Identifiable assets:                            
Total identifiable assets                       1,083,349 988,572  
Corporate and other assets(4)   172,384       227,674           172,384 227,674  
Assets 1,535,380 1,255,733       1,216,246       1,535,380   1,255,733 1,216,246  
Other Segments [Member]
                            
Identifiable assets:                            
Assets 1,293,678 1,083,349               1,293,678   1,083,349    
Corporate Assets [Member]
                            
Identifiable assets:                            
Assets 241,702 [2] 172,384 [2]               241,702 [2]   172,384 [2]    
Rental Tools [Member]
                            
Revenues:                            
Revenues 89,614   59,947             228,718 191,233 246,900 237,068 172,598
Operating gross margin:                            
Total operating gross margin 25,816 [3]   27,032 [3]             72,470 [3] 91,885 [3] 113,899 120,822 74,541
Identifiable assets:                            
Total identifiable assets                       194,600 188,520  
Rental Tools [Member] | Other Segments [Member]
                            
Identifiable assets:                            
Assets 375,900 194,600               375,900   194,600    
U.S. Barge Drilling [Member]
                            
Revenues:                            
Revenues 33,919   33,142             102,085 94,269 123,672 93,763 64,543
Operating gross margin:                            
Total operating gross margin 12,236 [3]   11,042 [3]             37,657 [3] 29,215 [3] 39,774 11,116 (11,503)
Identifiable assets:                            
Total identifiable assets                       99,409 108,396  
U.S. Barge Drilling [Member] | Other Segments [Member]
                            
Identifiable assets:                            
Assets 84,402 99,409               84,402   99,409    
U.S. Drilling [Member]
                            
Revenues:                            
Revenues 18,693                 48,238   1,387    
Operating gross margin:                            
Total operating gross margin 103 [3]   (4,712) [3]             (4,618) [3] (7,881) [3] (15,168) (3,915) (217)
Impairments and other charges                         (170,000)  
Identifiable assets:                            
Total identifiable assets                       374,794 265,166  
U.S. Drilling [Member] | Other Segments [Member]
                            
Identifiable assets:                            
Assets 367,020 374,794               367,020   374,794    
International Drilling [Member]
                            
Revenues:                            
Revenues 88,562 [4]   68,503 [4]             236,394 [4] 224,176 [4] 291,772 318,482 294,821
Operating gross margin:                            
Total operating gross margin 9,831 [3]   783 [3]             12,815 [3] 21,395 [3] 12,642 22,237 5,092
Identifiable assets:                            
Total identifiable assets                       414,546 426,490  
International Drilling [Member] | Other Segments [Member]
                            
Identifiable assets:                            
Assets 466,356 414,546               466,356   414,546    
Technical Services [Member]
                            
Revenues:                            
Revenues 6,974   3,709             15,483 11,117 14,251 27,695 36,423
Operating gross margin:                            
Total operating gross margin 153 [3]   (107) [3]             584 [3] (118) [3] (246) 5,335 5,052
Construction Contract [Member]
                            
Revenues:                            
Revenues                         9,638 91,090
Operating gross margin:                            
Total operating gross margin                         $ 771 $ 202
[1] General and administration expenses for field operations are included in operating expenses.
[2] This category includes corporate assets as well as minimal assets for our Technical Services segment primarily related to office furniture and fixtures.
[3] Operating gross margin is calculated as revenues less direct operating expenses, including depreciation and amortization expense.
[4] 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.