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Revenues - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]      
Accounts receivable balances $ 181,092,000   $ 160,214,000
Revenue 240,929,000 $ 445,927,000  
ASC Topic 606 Revenue from Contracts with Customers      
Disaggregation Of Revenue [Line Items]      
Accounts receivable balances 178,000,000   158,000,000
Revenue 2,300,000 0  
ASC Topic 606 Revenue from Contracts with Customers | Accounts Payable      
Disaggregation Of Revenue [Line Items]      
Total contract liability 1,100,000   $ 600,000
ASC Topic 606 Revenue from Contracts with Customers | Contract Drilling      
Disaggregation Of Revenue [Line Items]      
Amortized revenue $ 0 $ 100,000  
Maximum      
Disaggregation Of Revenue [Line Items]      
Accounts receivable payment terms 60 days    
Minimum      
Disaggregation Of Revenue [Line Items]      
Accounts receivable payment terms 30 days