Registration of securities issued in business combination transactions

General - Additional Information (Detail)

v2.4.0.8
General - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 2 Months Ended 9 Months Ended
Sep. 30, 2013
Country
Rigs
Sep. 30, 2012
Sep. 30, 2013
Country
Rigs
Sep. 30, 2012
Dec. 31, 2012
Rigs
Country
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2013
Exxon Neftegas Limited [Member]
Dec. 31, 2012
Exxon Neftegas Limited [Member]
Jun. 30, 2013
ITS [Member]
Sep. 30, 2013
ITS [Member]
Revenue, Major Customer [Line Items]                      
Number of countries in which Entity has operated since inception 50   50   50            
Number of countries in which entity operates         12            
Number of countries with international rental tools operations 10   10                
Barge drilling rigs 13   13   14            
Land rings 23   23   24            
Number of rigs held for sale 5   5                
Percentage accounted for under the equity method 50.00%   50.00%   50.00%            
Fair value adjustments for indefinite lived intangible assets                     $ 10,000,000
Fair value adjustments for finite lived intangible assets                     200,000
Weighted average useful life                   3 years 4 months 24 days 3 years
Reimbursement cost 16,200,000 12,100,000 46,500,000 29,800,000 44,900,000 64,200,000 40,100,000        
Deposits in domestic bank 117,100,000   117,100,000   12,200,000 10,200,000          
Deposits in foreign banks 51,800,000   51,800,000   34,500,000 38,400,000          
Exposure per occurrence     250,000   250,000            
Percentage of revenue from major customer               14.30% 11.80%    
Interest costs capitalized $ 700,000 $ 2,500,000 $ 1,700,000 $ 7,900,000 $ 10,200,000 $ 19,300,000 $ 13,500,000