Registration of securities issued in business combination transactions

Reportable Segments - Operations by Industry Segment (Detail)

v2.4.0.8
Reportable Segments - Operations by Industry Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Capital expenditures:              
Total capital expenditures     $ 102,856 $ 147,658 $ 191,543 $ 190,399 $ 219,184
Depreciation and amortization:              
Total depreciation and amortization 35,882 29,779 97,674 85,357 113,017 112,136 115,030
Rental Tools [Member]
              
Capital expenditures:              
Total capital expenditures         61,958 61,702 48,872
Depreciation and amortization:              
Total depreciation and amortization         42,944 40,497 36,558
U.S. Barge Drilling [Member]
              
Capital expenditures:              
Total capital expenditures         8,808 7,339 5,315
Depreciation and amortization:              
Total depreciation and amortization         13,906 17,006 22,165
U.S. Drilling [Member]
              
Capital expenditures:              
Total capital expenditures         86,786 99,915 113,177
Depreciation and amortization:              
Total depreciation and amortization         7,011 2,223  
International Drilling [Member]
              
Capital expenditures:              
Total capital expenditures         15,240 15,011 50,482
Depreciation and amortization:              
Total depreciation and amortization         45,967 48,965 52,429
Corporate [Member]
              
Capital expenditures:              
Total capital expenditures         18,751 6,432 1,338
Corporate and other [Member]
              
Depreciation and amortization:              
Total depreciation and amortization         $ 3,189 $ 3,445 $ 3,878