Registration of securities issued in business combination transactions

Reportable Segments - Results of Operations by Geographic Area (Detail)

v2.4.0.8
Reportable Segments - Results of Operations by Geographic Area (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:                            
Total 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 (loss) 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
Long-lived assets:                            
Total long-lived assets 858,672 789,123       719,809       858,672   789,123 719,809  
Scenario, Previously Reported [Member]
                            
Long-lived assets:                            
Total long-lived assets   786,158                   786,158    
Africa and Middle East [Member]
                            
Revenues:                            
Total revenues                       26,528 6,774 22,621
Operating gross margin:                            
Total operating gross margin                       (2,234) (6,383) 659
Long-lived assets:                            
Total long-lived assets   25,032       28,427           25,032 28,427  
Asia Pacific [Member]
                            
Revenues:                            
Total revenues                       39,400 38,477 26,416
Operating gross margin:                            
Total operating gross margin                       (927) 1,933 2,374
Long-lived assets:                            
Total long-lived assets   15,723       18,300           15,723 18,300  
CIS [Member]
                            
Revenues:                            
Total revenues                       122,304 176,421 149,963
Operating gross margin:                            
Total operating gross margin                       6,840 26,402 8,139
Long-lived assets:                            
Total long-lived assets   106,774       119,282           106,774 119,282  
Latin America [Member]
                            
Revenues:                            
Total revenues                       103,540 96,810 103,885
Operating gross margin:                            
Total operating gross margin                       8,990 377 1,210
Long-lived assets:                            
Total long-lived assets   63,899       57,710           63,899 57,710  
United States [Member]
                            
Revenues:                            
Total revenues                       386,210 368,164 356,590
Operating gross margin:                            
Total operating gross margin                       138,232 134,037 60,785
Long-lived assets:                            
Total long-lived assets   $ 574,730       $ 496,090           $ 574,730 $ 496,090  
[1] General and administration expenses for field operations are included in operating expenses.