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Supplemental Guarantor Consolidated Financial Statements - Condensed Consolidating Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Condensed Financial Statements, Captions [Line Items] |  |
Allowance for credit losses | $ 2,256 | $ 2,548
Amounts pledged | $ 569,995 | $ 653,651

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