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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
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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

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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