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Income Taxes - Additional Information (Detail) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 USD ($)
Tax Credit Carryforward [Line Items] |
NOL allocated amount | $ 4,831,481
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 | $ 4,596,127
United States [Member] |
Tax Credit Carryforward [Line Items] |
NOL allocated amount | 143,491
United Kingdom [Member] |
Tax Credit Carryforward [Line Items] |
NOL allocated amount | $ 91,863

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