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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
Condensed Financial Statements, Captions [Line Items]    
Allowance for credit losses $ 2,256 $ 2,548
Amounts pledged $ 569,995 $ 653,651