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Income Taxes - Component of Income Taxes (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Tax Disclosure [Abstract]    
Expected tax provision (benefit) at U.S. federal statutory income tax rate of 35% $ (5,200,000) $ 10,000,000
Incremental U.S. tax and rate differences on equity in earnings (7,400,000) (1,900,000)
Other, net (100,000) (100,000)
Total $ (12,658,000) $ 7,994,000