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Exit and Termination Costs - Exit and Termination Costs Included in Accrued Liabilities in Consolidated Balance Sheet - (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Exit costs included in accrued liabilities in consolidated balance sheet        
Accrued severance costs $ 0 $ 4,191 $ 509 $ 5,638
Exit Costs        
Exit costs included in accrued liabilities in consolidated balance sheet        
Beginning balance [1]     493,543  
Accrued severance costs [1]     0  
Accretion of discount [1]     37,213  
Divestiture contract obligations - changes in estimate [1]     (28,165)  
Payments [1]     (68,152)  
Ending balance [1] 434,439   434,439  
Termination Costs        
Exit costs included in accrued liabilities in consolidated balance sheet        
Beginning balance     1,454  
Accrued severance costs     509  
Accretion of discount     0  
Divestiture contract obligations - changes in estimate     0  
Payments     (1,695)  
Ending balance $ 268   $ 268  
[1] Includes the divestiture contract obligation and the transportation contract capacity release obligation.