Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
country
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
country
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Revenue, Major Customer [Line Items]                      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders                   $ 242 $ 265
Number Of Countries In Which Entity Has Operated Since Inception | country 50               50    
Number of countries with operations | country 21               21    
Percentage accounted for under the equity method 5000.00%               5000.00%    
Reimbursement cost                 $ 87,800 82,600 69,700
Capitalized interest costs of construction of rigs                 $ 200 1,200 2,400
Consumed and replenished period                 1 year    
Deposits in domestic bank $ 91,300       $ 59,300       $ 91,300 59,300  
Deposits in foreign banks 44,100       54,400       $ 44,100 54,400  
Percentage of revenue from major customer                 27.90%    
Contract margin (3,460) $ 4,871 $ 4,021 $ 24,267 36,768 $ 45,066 $ 43,485 $ 28,863 $ 29,699 154,182 $ 168,447
Share-based awards vesting period                 3 years    
Intercompany payables 0       $ 0       $ 0 $ 0  
Noncontrolling Interest, Fair Value Disclosure 3,000                    
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                 10 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