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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]      
Operating lease, right-of-use assets $ 6,833 $ 6,833 $ 3,025
Prior advance notice period for cancellation of rig contracts   45 days  
Cash payments for operating leases associated with right-of-use assets $ 625 $ 1,300  
Operating lease, weighted average remaining lease term 3 years 3 months 18 days 3 years 3 months 18 days  
Operating lease, weighted average discount rate, percent 2.80% 2.80%  
Expected future payments for contracted drilling services $ 4,800 $ 4,800