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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets [abstract]    
Interest receivable $ 6,457 $ 12,838
Other 1,348 1,368
Other currents assets 7,805 14,206
Guarantee deposits 3,010 4,121
Deposits for litigation 8,126 10,548
Other assets 3,212 3,212
Other non - current assets 14,348 17,881
Other current and non-current assets $ 22,153 $ 32,087