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Summary of Significant Accounting Policies - Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounting Policies [Abstract]      
Operating lease, right-of-use assets   $ 7,201 $ 3,025
Prior advance notice period for cancellation of rig contracts   45 days  
Renewal term (in years) 3 years    
Operating lease right-of-use asset obtained in renewal $ 4,700    
Cash payments for operating leases associated with right-of-use assets   $ 661  
Operating lease, weighted average remaining lease term   3 years 4 months 24 days  
Operating lease, weighted average discount rate, percent   2.80%  
Expected future payments for contracted drilling services   $ 5,900