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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | $ 6,079,936
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 | 5,195,425
United States [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | 577,742
United Kingdom [Member] |
Tax Credit Carryforward [Line Items] |
Operating loss carryforward | $ 306,769

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