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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Income Tax [Line Items]          
Effective income tax rate (20.10%) (37.40%) 13.50% (9.50%)  
Weighted average expected income tax expense (benefit) rate (19.90%) (49.50%) 11.10% (13.50%)  
Make-whole provision on guaranteed senior notes   $ 2.9      
Alternative minimum tax credit carry forward 9.9   9.9   9.9
Net operating loss carryforwards $ 0   $ 0   $ 1.2
UNITED STATES
          
Income Tax [Line Items]          
Statutory income tax rates     35.00%    
BERMUDA
          
Income Tax [Line Items]          
Statutory income tax rates     0.00%    
CAYMAN ISLANDS
          
Income Tax [Line Items]          
Statutory income tax rates     0.00%    
GIBRALTAR
          
Income Tax [Line Items]          
Statutory income tax rates     0.00%    
LUXEMBOURG
          
Income Tax [Line Items]          
Statutory income tax rates     29.22%    
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%