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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Income Taxes              
Unrecognized tax benefits $ 4,700   $ 4,700        
Unrecognized tax benefits would impact the effective tax rate 4,400   4,400        
Cumulative accrued interest 400   $ 400        
Effective tax rate from operations     32.20% 43.10%      
(Benefit from) provision for income taxes (120,198) $ 1,509 $ (194,462) $ 3,069      
Effective U.S corporate tax rate     21.00%       35.00%
Provision for transition tax           $ 37,200 $ 40,300
Measurement period adjustment to reduce transition tax           $ (3,100)  
Transition tax, unpaid 25,100   $ 25,100        
Transition Tax over an eight-year period beginning     2018        
Digital asset impairment losses 424,774 $ 0 $ 618,869 $ 0      
Tax benefit of impairment losses 173,300   173,300        
Tax benefit from stock options exercise 22,300   22,300        
Other Long-term Liabilities              
Income Taxes              
Transition tax, unpaid 22,100   22,100        
Accounts Payable, Accrued Expenses and Operating Lease Liabilities              
Income Taxes              
Transition tax, unpaid 3,000   3,000        
U.S              
Income Taxes              
Cash and cash equivalents and short-term investments 13,000   $ 13,000   $ 13,700    
U.S | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2016        
Italy | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2016        
Poland | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2015        
Spain | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2017        
United Kingdom | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2017        
Germany | Earliest Tax Year              
Income Taxes              
Tax years subject to examination     2016        
Foreign              
Income Taxes              
Cash and cash equivalents and short-term investments 43,400   $ 43,400   46,000    
Foreign earnings repatriated     42,500   $ 186,600    
Undistributed foreign earnings $ 108,500   $ 108,500