XML 30 R19.htm IDEA: XBRL DOCUMENT v3.20.2
Summary of Significant Accounting Policies - Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Accounting Policies [Abstract]      
Operating lease, right-of-use assets $ 3,554 $ 3,554 $ 3,509
Prior advance notice period for cancellation of rig contracts   45 days  
Cash payments for operating leases associated with right-of-use assets $ 700 $ 1,800  
Operating lease, weighted average remaining lease term 1 year 8 months 12 days 1 year 8 months 12 days  
Operating lease, weighted average discount rate, percent 4.40% 4.40%  
Expected future payments for contracted drilling services $ 5,200 $ 5,200