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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Tax Credit Carryforward [Line Items]  
NOL allocated amount $ 5,225,954us-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 4,910,269us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
United States [Member]  
Tax Credit Carryforward [Line Items]  
NOL allocated amount 133,626us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
United Kingdom [Member]  
Tax Credit Carryforward [Line Items]  
NOL allocated amount $ 182,059us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_GB