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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | $ 6,031,251
Expiration period | Expiring in 2029 and will fully expire in 2034
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] |
Net operating tax carryforward | 5,096,774
United States [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | 623,446
United Kingdom [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | $ 311,031

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