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
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Gross Amounts $ 1,947 $ 27,471
Gross Amounts Offset (125) (1,065)
Total Net Amounts 1,822 26,406
Gross Amounts Not Offset   (15,126)
Net Amounts 1,822 11,280
Gross Amounts 7,533 19,478
Gross Amounts Offset (2,071)  
Total Net Amounts 5,462 19,478
Gross Amounts Not Offset (4,314) (19,478)
Net Amounts $ 1,148