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Revenues - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]          
Accounts receivable balances $ 157,981   $ 157,981   $ 339,699
Amount amortized and recorded in drilling revenue 250,380 $ 675,765 696,307 $ 1,379,936  
Contract Drilling          
Disaggregation Of Revenue [Line Items]          
Amount amortized and recorded in drilling revenue 171,134 $ 348,138 438,498 720,530  
ASC Topic 606 Revenue from Contracts with Customers          
Disaggregation Of Revenue [Line Items]          
Accounts receivable balances 157,000   157,000   336,000
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable          
Disaggregation Of Revenue [Line Items]          
Total contract liability $ 900   900   $ 2,700
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling          
Disaggregation Of Revenue [Line Items]          
Amount amortized and recorded in drilling revenue     $ 100 $ 800  
Maximum          
Disaggregation Of Revenue [Line Items]          
Accounts receivable payment terms     60 days    
Minimum          
Disaggregation Of Revenue [Line Items]          
Accounts receivable payment terms     30 days