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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets [abstract]      
Interest receivable $ 10,443 $ 6,741  
Other 1,258 909  
Other currents assets 11,701 7,650 $ 5,946
Guarantee deposits 14,568 10,401  
Deposits for litigation 12,390 12,482  
Other assets 4,182 4,182  
Other non - current assets 31,140 27,065 $ 68,193
Other current and non-current assets $ 42,841 $ 34,715