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Restatement of consolidated financial statements - Additional Information (Detail) (USD $)
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12 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
Adjustment
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Dec. 31, 2010
Adjustment
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Dec. 31, 2009
Adjustment
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Sep. 30, 2012
Adjustment
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Jun. 30, 2012
Adjustment
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Mar. 31, 2012
Adjustment
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Sep. 30, 2011
Adjustment
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Jun. 30, 2011
Adjustment
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Mar. 31, 2011
Adjustment
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Sep. 30, 2011
Adjustment
Short term deferred tax asset
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Jun. 30, 2011
Adjustment
Short term deferred tax asset
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Mar. 31, 2011
Adjustment
Short term deferred tax asset
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Dec. 31, 2010
Adjustment
Short term deferred tax asset
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| Net income (LOSS) | $ (363,238,000) | $ (1,325,620,000) | $ (150,929,000) | $ (2,236,000) | $ (12,856,000) | $ (8,000,000) | ||||||||||
| Deferred tax asset | 17,883,000 | 22,677,000 | 61,128,000 | 25,700,000 | 66,700,000 | 12,900,000 | ||||||||||
| Deferred tax liability | 0 | 47,400,000 | 6,400,000 | |||||||||||||
| Accumulated other comprehensive income | 14,325,000 | 32,550,000 | (2,612,000) | 1,565,000 | 1,565,000 | (2,612,000) | (2,612,000) | (2,612,000) | (3,840,000) | 4,134,000 | 2,088,000 | |||||
| Deferred tax liability presented as decrease in deferred tax asset | 94,034,000 | 95,352,000 | 121,964,000 | 4,224,000 | (47,354,000) | 2,517,000 | 2,458,000 | 2,902,000 | (42,996,000) | (50,970,000) | (49,705,000) | |||||
| Adjustment to short term deferred tax asset | $ 10,600,000 | $ 31,500,000 | $ 30,700,000 | $ 29,300,000 | ||||||||||||