General form of registration statement for all companies including face-amount certificate companies

Other (Expense)/Income - Summary of Other Nonoperating Income (Expense) (Detail)

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Other (Expense)/Income - Summary of Other Nonoperating Income (Expense) (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Non Operating Expense Income [Line Items]        
Debt Issuance Costs Expensed $ (47,718) $ 0    
Other Nonoperating Income 17 281    
Other Nonoperating Income (Expense) (147,370) 281 $ 103 $ (190)
Two Thousand and Twenty One Bridge Notes [Member] | Debt First Tranche [Member] | Two Thousand and Twenty One Bridge Financing [Member]        
Non Operating Expense Income [Line Items]        
Loss On Issuance Of Debt (84,291) 0    
Two Thousand and Twenty One Bridge Notes [Member] | Debt Second Tranche [Member] | Two Thousand and Twenty One Bridge Financing [Member]        
Non Operating Expense Income [Line Items]        
Loss On Issuance Of Debt (12,185) 0    
Bridge Notes Rights Offering [Member] | Two Thousand and Twenty One Bridge Financing [Member]        
Non Operating Expense Income [Line Items]        
Loss On Issuance Of Debt (3,193) $ 0    
Debt Issuance Costs Expensed $ 100