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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Tax Credit Carryforward [Line Items] |
NOL allocated amount | $ 5,225,954 us-gaap_OperatingLossCarryforwards
Operating tax carryforward expiration year start | 2029
Operating tax carryforward expiration year end | 2034
U. S. Federal Net Operating Tax [Member] |
Tax Credit Carryforward [Line Items] |
NOL allocated amount | 4,910,269 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
United States [Member] |
Tax Credit Carryforward [Line Items] |
NOL allocated amount | 133,626 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = country_US
United Kingdom [Member] |
Tax Credit Carryforward [Line Items] |
NOL allocated amount | $ 182,059 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = country_GB

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: 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 + Details
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