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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Income Tax [Line Items]            
Effective income tax expense (benefit) rate (5.00%) (755.00%) 11.20% (55.70%)    
Alternative minimum tax credit carry forward           $ 11,000
AMT credit carryforward reclassed to federal income tax receivable $ 11,136   $ 11,136   $ 10,866  
Net operating loss carryforwards 24,700   24,700   29,500  
Section 163(j) carryforward $ 11,100   $ 11,100   $ 11,100  
Alternative Minimum Tax Credits            
Income Tax [Line Items]            
AMT credit carryforward reclassed to federal income tax receivable           $ 11,000
UNITED STATES            
Income Tax [Line Items]            
Statutory income tax rates     21.00%      
BERMUDA            
Income Tax [Line Items]            
Statutory income tax rates     0.00%      
CAYMAN ISLANDS            
Income Tax [Line Items]            
Statutory income tax rates     0.00%      
LUXEMBOURG            
Income Tax [Line Items]            
Statutory income tax rates     26.01%      
IRELAND | Non Trading Income            
Income Tax [Line Items]            
Statutory income tax rates     25.00%      
IRELAND | Capital Gain            
Income Tax [Line Items]            
Statutory income tax rates     33.00%      
IRELAND | Trading Income            
Income Tax [Line Items]            
Statutory income tax rates     12.50%      
BARBADOS | Minimum [Member]            
Income Tax [Line Items]            
Statutory income tax rates     1.00%      
BARBADOS | Maximum            
Income Tax [Line Items]            
Statutory income tax rates     2.50%