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Fresh Start Accounting - Reorganization Adjustments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Apr. 23, 2021
Dec. 31, 2020
Reorganization Chapter11 [Line Items]      
ROU asset $ 41,812   $ 154,796
Finance lease liabilities 168,056    
Reduction in accounts payable $ 35,725 $ 65,401 $ 33,437
Reorganization Adjustments      
Reorganization Chapter11 [Line Items]      
Reclassification of current BOP operating lease liability to finance lease   17,200  
Adjustment to deferred taxes   3,900  
Reclassification of non-current BOP operating lease liability to finance lease   90,100  
ASC 842 | Reorganization Adjustments      
Reorganization Chapter11 [Line Items]      
Current BOP finance lease liability   2,100  
Non-current BOP finance lease liability   68,800  
Reorganization Adjustments      
Reorganization Chapter11 [Line Items]      
ROU asset   116,200  
Reorganization Adjustments | ASC 842      
Reorganization Chapter11 [Line Items]      
Finance lease liabilities   66,800  
Reorganization, Chapter 11, Predecessor, before Adjustment | Reorganization Adjustments      
Reorganization Chapter11 [Line Items]      
Reduction in accounts payable   1,000  
Reorganization, Chapter 11, Predecessor, before Adjustment | Reorganization Adjustments      
Reorganization Chapter11 [Line Items]      
Reduction in accounts payable   $ (996)