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Commitments Contingencies and Other Matters - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Commitments and Contingencies Disclosure [Line Items]      
Letters of credit, collateral for retrospective premiums and retained losses     $ 60,800,000
Commitments to purchase major equipment     $ 14,700,000
Agreement expire description     The agreements expire in years 2021 and 2022.
Current obligation     $ 13,400,000
Purchase obligations for 2021     10,000,000.0
Purchase obligations for 2022     3,400,000
Deposit revaluation charge $ 9,200,000 $ 12,700,000  
Capacity reservation contract $ 0    
General liability insurance policy, deductible per occurrence     10,000,000.0
Workers' compensation insurance policy, deductible per occurrence     1,500,000
Primary automobile liability insurance policy, deductible per occurrence     2,000,000.0
Equipment insurance policy, deductible per occurrence     1,000,000.0
Excess automobile liability insurance policy, deductible per occurrence     $ 5,000,000.0
Change in Control Agreements      
Commitments and Contingencies Disclosure [Line Items]      
Employee entitlement ratio     200.00%
Continued coverage entitlement of welfare plan period     2 years
Employment Agreements      
Commitments and Contingencies Disclosure [Line Items]      
Initial agreement term     3 years
Agreement termination description     Under specified circumstances, we may terminate the executive’s employment under his Employment Agreement for Cause (as defined in the Employment Agreement) by either (i) providing written notice 10 days before the effective date of such termination and by granting at least 10 days to cure the cause for such termination or (ii) by providing written notice of such termination at least 30 days before the effective date of such termination and by granting at least 20 days to cure the cause for such termination, provided that if the matter is reasonably determined by us to not be capable of being cured, the executive may be terminated for cause on the date the written notice is delivered.
Accelerated vesting period description     we will accelerate vesting of all options and restricted stock awards on the 60th day following the executive’s termination
Termination benefits description     If our decision to terminate other than for Cause or by the executive for Good Reason occurs following a Change in Control (as defined in his Employment Agreement, which for the President of Patterson-UTI Drilling includes a change in control of us or, in certain circumstances, of Patterson-UTI Drilling), the executive will generally be entitled to the same severance payments and benefits described above except that the pro-rated lump-sum payment for annual cash bonuses will be based on his highest annual cash bonus for the last three years, and the executive will be entitled to 36 months (in the case of the Chief Executive Officer) or 30 months (in the case of the Chief Financial Officer, General Counsel and President of Patterson-UTI Drilling) of subsidized benefits continuation coverage.
Period considered for calculating annual cash bonus payment     3 years
Employment Agreements | Minimum      
Commitments and Contingencies Disclosure [Line Items]      
Agreement termination notice period     30 days
Specified Employees | Change in Control Agreements      
Commitments and Contingencies Disclosure [Line Items]      
Automatic renewal period     12 months
New term notification period     90 days
Chief Executive Officer | Employment Agreements      
Commitments and Contingencies Disclosure [Line Items]      
Employee entitlement ratio on sum of base salary and average cash bonus     300.00%
Period for subsidized benefit continuation coverage     36 months
Chief Financial Officer, General Counsel and President | Employment Agreements      
Commitments and Contingencies Disclosure [Line Items]      
Employee entitlement ratio on sum of base salary and average cash bonus     250.00%
Period for subsidized benefit continuation coverage     30 months
Letter of Credit      
Commitments and Contingencies Disclosure [Line Items]      
Amount drawn under letters of credit     $ 0