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Supplemental Guarantor Condensed Consolidated Financial Statements - Condensed Consolidating Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Statement Of Financial Position [Abstract] |  |
Allowance for credit losses | $ 2,423 | $ 2,256
Amounts pledged | $ 586,625 | $ 569,995

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