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
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Gross Amounts $ 7,512 $ 32,989
Gross Amounts Offset (1,495) (3,711)
Total Net Amounts 6,017 29,278
Gross Amounts Not Offset   (11,685)
Net Amounts 6,017 17,593
Gross Amounts 31,420 39,486
Gross Amounts Offset (2,894) (2,538)
Total Net Amounts 28,526 36,948
Gross Amounts Not Offset (19,949) (36,710)
Net Amounts $ 8,577 $ 238