Annual report pursuant to Section 13 and 15(d)

Valuation Allowance of Deferred Tax Assets (Detail)

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Valuation Allowance of Deferred Tax Assets (Detail) (Valuation Allowance of Deferred Tax Assets, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Valuation Allowance of Deferred Tax Assets
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 15,443 $ 15,425 $ 18,228
Additions 6,298 2,338 3,398
Deductions (8,415) (2,320) (6,201)
Ending Balance $ 13,326 $ 15,443 $ 15,425