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Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheet (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Statement Of Financial Position [Abstract]    
Allowance for credit losses $ 2,441 $ 2,423
Amounts pledged $ 483,347 $ 586,625