Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail)

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Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Gross Amounts   $ 27,471
Gross Amounts Offset   (1,065)
Total Net Amounts   26,406
Gross Amounts Not Offset   (15,126)
Net Amounts   11,280
Gross Amounts 32,374 19,478
Gross Amounts Offset (215)   
Total Net Amounts 32,159 19,478
Gross Amounts Not Offset (4,847) (19,478)
Net Amounts $ 27,312