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Revenues - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]      
Accounts receivable balances $ 319,072   $ 339,699
Amount amortized and recorded in drilling revenue 445,927 $ 704,171  
Contract Drilling      
Disaggregation Of Revenue [Line Items]      
Amount amortized and recorded in drilling revenue 267,364 372,392  
ASC Topic 606 Revenue from Contracts with Customers      
Disaggregation Of Revenue [Line Items]      
Accounts receivable balances 317,000   336,000
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable      
Disaggregation Of Revenue [Line Items]      
Total contract liability 1,300   $ 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 $ 400  
Maximum      
Disaggregation Of Revenue [Line Items]      
Accounts receivable payment terms 60 days    
Minimum      
Disaggregation Of Revenue [Line Items]      
Accounts receivable payment terms 30 days