Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.6.0.2
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
country
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
country
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Revenue, Major Customer [Line Items]                      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders                     $ 242
Number Of Countries In Which Entity Has Operated Since Inception | country 50               50    
Number of countries with operations | country 20               20    
Percentage accounted for under the equity method 50.00%               50.00%    
Reimbursement cost                 $ 69,300 $ 87,800 82,600
Capitalized interest costs of construction of rigs                 $ 200 200 1,200
Consumed and replenished period                 1 year    
Deposits in domestic bank $ 81,400       $ 91,300       $ 81,400 91,300  
Deposits in foreign banks 39,700       44,100       $ 39,700 44,100  
Percentage of revenue from major customer                 38.70%    
Contract margin (19,694) $ (21,965) $ (20,225) $ (13,428) (3,460) $ 4,871 $ 4,021 $ 24,267 $ (75,312) 29,699 $ 154,182
Intercompany payables 0       $ 0       $ 0 $ 0  
Noncontrolling Interest, Fair Value Disclosure 3,000                    
Exxon Neftegas Limited (ENL) [Member]                      
Revenue, Major Customer [Line Items]                      
Percentage of revenue from major customer                 38.70%    
Reimbursement Revenue                 $ 67,000    
Concentration Risk, Other Risk                 0.275    
BP Exploration Alaska, Inc. [Member]                      
Revenue, Major Customer [Line Items]                      
Percentage of revenue from major customer                 12.00%    
Land Drilling Equipment | Minimum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 3 years    
Land Drilling Equipment | Maximum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 20 years    
Barage Drilling Equipment | Minimum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 3 years    
Barage Drilling Equipment | Maximum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 20 years    
Drill pipe, rental tools and other | Minimum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 4 years    
Drill pipe, rental tools and other | Maximum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 15 years    
Buildings and improvements | Minimum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 5 years    
Buildings and improvements | Maximum [Member]                      
Revenue, Major Customer [Line Items]                      
Barge drilling equipment, useful life                 30 years    
Russia [Member]                      
Revenue, Major Customer [Line Items]                      
Gain (Loss) on Sale of Interest in Consolidated Joint Venture     900                
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     $ 800                
Egypt [Member]                      
Revenue, Major Customer [Line Items]                      
Gain (Loss) on Sale of Interest in Consolidated Joint Venture 4,800                    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 2,200                    
ITS Arabia Limited [Member]                      
Revenue, Major Customer [Line Items]                      
Purchase Price of Remaining Noncontrolling Interest 6,750                    
Intercompany payables $ 3,375               $ 3,375    
Drilling Services [Member] | U.S. Operations [Member]                      
Revenue, Major Customer [Line Items]                      
Number of Reportable Segments | segment                 2    
Rental Tools [Member] | U.S. Operations [Member]                      
Revenue, Major Customer [Line Items]                      
Number of Reportable Segments | segment                 2