• Filing Date: 2019-03-08
  • Form Type: 10-K
  • Description: Annual report
v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]        
Uncertain tax positions or unrecognized tax benefits   $ 0 $ 0 $ 0
Accrued interest and penalty $ 0 $ 0 $ 0  
Income taxes at statutory rate, percentage 21.00% 35.00% 35.00%  
Income tax expense (benefit) $ 9,177,000 $ (8,731,000) $ 17,835,000  
Effective tax rate 34.10% 55.90% 38.10%  
Derecognition of deferred tax assets $ 1,825,000      
Disallowance of the deductibility dividends paid $ 1,887,000      
Illiquid Assets [Member]        
Income Tax Disclosure [Line Items]        
Percentage of mandatory one time tax 8.00%      
Cash and Cash Equivalents [Member]        
Income Tax Disclosure [Line Items]        
Percentage of mandatory one time tax 15.50%      
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Percentage of shareholding by controlled foreign corporations and other specified foreign corporations 10.00%