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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% |  |

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- Definition The weighted average tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period + References No definition available. + Details
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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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: 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 3: 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 4: 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 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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