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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% |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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