Quarterly report pursuant to Section 13 or 15(d)

General - Additional Information (Detail)

v3.5.0.2
General - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Revenue, Major Customer [Line Items]          
Number of Reportable Segments | segment       4  
Payments to Acquire Property, Plant, and Equipment       $ 20,994 $ 72,469
Percentage accounted for under the equity method 50.00%     50.00%  
Reimbursable Costs $ 19,400   $ 20,800 $ 55,800  
Deposits in domestic bank 69,200 $ 91,300   69,200  
Deposits, Foreign $ 34,800 44,100   $ 34,800  
Noncontrolling Interest, Fair Value Disclosure   6,750      
Redeemable Noncontrolling Interest, Equity, Carrying Amount   3,000      
Exxon Neftegas Limited [Member]          
Revenue, Major Customer [Line Items]          
Percentage of revenue from major customer       39.60% 27.00%
Reimbursement Revenue       $ 54,300 $ 58,100
Concentration Risk, Other Risk       0.28 0.191
BP Exploration Alaska, Inc. [Member]          
Revenue, Major Customer [Line Items]          
Percentage of revenue from major customer       11.90%  
ITS Arabia Limited [Member]          
Revenue, Major Customer [Line Items]          
Purchase Price of Remaining Noncontrolling Interest   $ 3,400      
Drilling Services [Member] | U.S. Operations [Member]          
Revenue, Major Customer [Line Items]          
Number of Reportable Segments | segment       2  
Drilling Services [Member] | International Operations [Member]          
Revenue, Major Customer [Line Items]          
Number of Reportable Segments | segment       2  
Drilling Services [Member] | International Operations [Member] | Exxon Neftegas Limited [Member]          
Revenue, Major Customer [Line Items]          
Percentage of revenue from major customer       58.40% 44.70%
Concentration Risk, Other Risk       0.456 0.347
Drilling Services [Member] | International Operations [Member] | BP Exploration Alaska, Inc. [Member]          
Revenue, Major Customer [Line Items]          
Percentage of revenue from major customer       17.30%  
Rental Tools [Member] | U.S. Operations [Member]          
Revenue, Major Customer [Line Items]          
Number of Reportable Segments | segment       2  
Rental Tools [Member] | International Operations [Member]          
Revenue, Major Customer [Line Items]          
Number of Reportable Segments | segment       2