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Income Taxes - Summary of Components of Income Tax (Benefit) Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]      
Federal $ 0 $ 351 $ (1,775)
State and local 0 0 0
Current income tax expense benefit 0 351 (1,775)
Federal 0 0 45,311
State and local 0 0 6,663
Deferred income tax expense benefit 0 0 51,974
Total expense (benefit) 0 351 50,199
Puerto Rico [Member]
      
Components Of Income Tax Expense Benefit [Line Items]      
Book loss before income taxes (19,738) (20,835) (17,276)
Current income tax expense benefit 0 0 0
Deferred income tax expense benefit 0 0 0
Total expense (benefit) $ 0 $ 0 $ 0