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Summary of Uncertain Tax Position (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Tax Uncertainties [Line Items]    
Balance as of January 1 $ (111,013) $ (112,311)
Increases related to prior years' tax positions (128) (56)
Increases related to current year tax positions (1,267) (624)
Settlements with taxing authorities      
Expiration of the statute of limitations 1,105 1,978
Balance at December 31 $ (111,303) $ (111,013)