Annual report pursuant to Section 13 and 15(d)

Property Plant and Equipment (Detail)

v3.19.1
Property Plant and Equipment (Detail)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
business_line
Dec. 31, 2018
USD ($)
business_line
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   $ 1,486,169,000 $ 1,968,876,000  
Less: Accumulated depreciation and amortization   951,798,000 1,343,105,000  
Property, plant, and equipment, net   534,371,000 625,771,000  
Depreciation   $ 105,200,000 119,600,000 $ 136,300,000
Number of business lines | business_line 2 2    
Loss on impairment   $ 50,698,000 0 0
Provision for reduction in carrying value of certain assets   0 1,938,000 0
Gain (loss) on disposition of assets, net   (1,724,000) (2,851,000) $ (1,613,000)
Drilling equipment        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   720,037,000 1,228,443,000  
Rental tools        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   581,107,000 552,461,000  
Building, land and improvements        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   58,193,000 60,309,000  
Other        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   115,977,000 115,910,000  
Construction in progress        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   10,855,000 $ 11,753,000  
Barge Rigs        
Property, Plant and Equipment [Line Items]        
Loss on impairment   44,000,000.0    
Barge Rigs | Gulf of Mexico        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   19,700,000    
Loss on impairment   34,200,000    
Barge Rigs | International        
Property, Plant and Equipment [Line Items]        
Total property, plant and equipment, at cost   3,400,000    
Loss on impairment   $ 9,800,000