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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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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

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