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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax [Line Items]
Effective income tax rate	(13.70%)	25.90%	(37.80%)	18.80%
Deferred tax assets, valuation allowance	$ 0		$ 0		$ 0
Alternative minimum tax credit carry forward	10,473,000		10,473,000		10,473,000
Net operating loss carryforwards	$ 0		$ 0		$ 0
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%

X

- Definition

The foreign statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period.

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Income Tax [Line Items]

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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