Quarterly report pursuant to Section 13 or 15(d)

Reportable Segments - Additional Information (Detail)

v2.4.0.8
Reportable Segments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
segment
Sep. 30, 2013
Segment Information [Line Items]        
Number of Reportable Segments     5  
Change in fair value of derivative positions $ 0 $ 0 $ 0 $ 54
Exxon Neftegas Limited [Member]
       
Segment Information [Line Items]        
Percentage of revenue from major customer     20.00% 14.30%
Exxon Neftegas Limited [Member] | International Drilling [Member]
       
Segment Information [Line Items]        
Percentage of revenue from major customer     43.00%  
Exxon Neftegas Limited [Member] | Technical Services [Member]
       
Segment Information [Line Items]        
Percentage of revenue from major customer     68.00%