Quarterly report pursuant to Section 13 or 15(d)

Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail)

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Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Gross Amounts $ 17,661 $ 32,989
Gross Amounts Offset (3,048) (3,711)
Total Net Amounts 14,613 29,278
Gross Amounts Not Offset   (11,685)
Net Amounts 14,613 17,593
Gross Amounts 23,409 39,486
Gross Amounts Offset (1,065) (2,538)
Total Net Amounts 22,344 36,948
Gross Amounts Not Offset (21,887) (36,710)
Net Amounts $ 457 $ 238