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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Balance Sheet (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Allowance for credit losses $ 2,434 $ 2,256
Amounts pledged $ 805,399 $ 569,995