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Income Taxes - Reconciliations of Income Tax Rates and Actual Tax Charge (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Net loss before taxes	$ (325,522)	$ (372,131)	$ (172,975)
Net loss not subject to taxes	(129,307)	(341,473)	(416,684)
Net (loss) income subject to taxes	(196,215)	(30,658)	243,709
At applicable statutory tax rates	(15,808)	(8,987)	57,737
Permanent and currency differences	(253,143)	(172,368)	(104,514)
Adjustments to valuation allowances and uncertain tax positions	250,327	179,675	40,863
Other	4,218	5,970	(426)
Tax expense (recovery) related to the current year	$ (14,406)	$ 4,290	$ (6,340)

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to pretax Income or Loss from continuing operations; income tax expense or benefit may include interest and penalties on tax uncertainties based on the entity's accounting policy.

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