Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Depreciable Lives for Different Categories of Property Plant and Equipment (Details)

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Summary of Significant Accounting Policies - Summary of Depreciable Lives for Different Categories of Property Plant and Equipment (Details)
 12 Months Ended
Dec. 31, 2019
Computer, office equipment and other | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 3 years
Computer, office equipment and other | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 10 years
Land drilling equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 3 years
Land drilling equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 20 years
Barge drilling equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 3 years
Barge drilling equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 20 years
Drill pipe, rental tools, and other | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 4 years
Drill pipe, rental tools, and other | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 15 years
Buildings and improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 5 years
Buildings and improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Property, plant and equipment, depreciable life 5 years