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Intangible Assets - Summary of Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]      
Amortizing intangible assets, Gross Carrying Amount $ 31,999 $ 31,999  
Aggregate amortization expense:      
Aggregate amortization expense, Gross Carrying Amount 2,159 3,481 3,732
Estimated Amortization Expense:      
Estimated Amortization Expense, 2013 1,127    
Estimated Amortization Expense, 2014 475    
Estimated Amortization Expense, 2015 437    
Estimated Amortization Expense, 2016 395    
Estimated Amortization Expense, 2017 366    
Estimated Amortization Expense, Thereafter 589    
Amortizing intangible assets, Accumulated Amortization $ (28,610) $ (26,451)