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Exit and Termination Costs - Exit and Termination Costs Included in Accrued Liabilities in Consolidated Balance Sheet - (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Exit costs included in accrued liabilities in consolidated balance sheet      
Accrued severance costs $ 5,909 $ 7,535 $ (356)
Exit Costs      
Exit costs included in accrued liabilities in consolidated balance sheet      
Accrued contract obligations 490,114    
Accretion of discount 20,720    
Payments (17,291)    
Ending balance 493,543    
Termination Costs      
Exit costs included in accrued liabilities in consolidated balance sheet      
Beginning balance 4,692    
Accrued severance costs 5,909 7,535  
Payments (9,147) (2,843)  
Ending balance $ 1,454 $ 4,692